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dotfiles/weechat/logs/irc.libera.##rust.weechatlog

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updated dotfiles
2021-07-07 21:59:54 -05:00
2021-06-19 11:27:04 --> wymiller (~wyatt@096-042-164-072.res.spectrum.com) has joined ##rust
2021-06-19 11:27:04 -- Topic for ##rust is "Unofficial channel for the Rust programming language | Don't ask to ask, just ask! | Code of conduct: https://rust-lang.org/policies/code-of-conduct | evalr2: «code» to run Rust code | Other chat/help venues: https://rust-lang.org/community"
2021-06-19 11:27:04 -- Topic set by mrmonday (~robert@what.i.hope.is.not.a.tabernaevagant.es) on Sun, 30 May 2021 09:05:42
2021-06-19 11:27:04 -- Channel ##rust: 585 nicks (1 op, 0 voices, 584 normals)
2021-06-19 11:27:06 -- Channel created on Wed, 19 May 2021 08:20:38
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2021-06-19 11:44:57 capitol how annoying, some update broke lexical-core-0.6.2, and it's down in my dependecy stack
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2021-06-19 12:01:47 zipper Hey, rust people. I have an interesting problem. I'm trying to get_mut different parts of a struct that wraps a vec but I can't.
2021-06-19 12:01:56 zipper Worse still I can't reproduce it
2021-06-19 12:04:28 --> GNUcifer (~ct@i59F4BE39.versanet.de) has joined ##rust
2021-06-19 12:05:18 GNUcifer blubb ... i should setup some better identify
2021-06-19 12:06:40 -- GNUcifer is now known as cehteh
2021-06-19 12:07:06 bertptrs zipper: what do you mean "can't reproduce it"?
2021-06-19 12:07:53 cehteh danieldg Mutabah : https://crates.io/crates/bintest .. that was pretty easy
2021-06-19 12:09:08 zipper Something was wrong with my connection
2021-06-19 12:09:19 zipper Did you see the pasted I posted?
2021-06-19 12:09:43 zipper How do I test whether I'm even online? I have a bad internet connection
2021-06-19 12:10:20 meltyness it depends on if your internet connection has a good internet connection
2021-06-19 12:11:11 bertptrs zipper: I did not see your paste, no
2021-06-19 12:12:06 zipper Okay, umm so this paste doesn't work https://play.rust-lang.org/?version=stable&mode=debug&edition=2018&gist=c6be07242a9b372b411f27c04c42f367
2021-06-19 12:12:21 zipper but this attempt at reproducing it does https://play.rust-lang.org/?version=stable&mode=debug&edition=2018&gist=45982b4b477efa1be9569316a51f9849
2021-06-19 12:12:45 zipper Basically the borrow checker feels that I'm mutably borrowing twice
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2021-06-19 12:14:05 bertptrs you are, once on the left hand of the assignment and again on the right
2021-06-19 12:14:21 bertptrs no wait I'm reading the error wrong
2021-06-19 12:15:07 zipper bertptrs: the problem happens when I want to call cmp::max()
2021-06-19 12:15:19 zipper and I call get_score
2021-06-19 12:17:39 danieldg zipper: the compiler does not try to prove that two calls to get_score don't point to the same element
2021-06-19 12:18:05 --> chrysanthematic (~chrysanth@user/chrysanthematic) has joined ##rust
2021-06-19 12:18:33 danieldg zipper: so your mwavefront could alias the later get_score. Aliasing mut references are not allowed.
2021-06-19 12:18:47 zipper How come it doesn't happen when I try to reproduce the error which could also have the same thing happen?
2021-06-19 12:19:00 danieldg your reproduction didn't do that
2021-06-19 12:19:22 bertptrs zipper: non-lexical lifetimes
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2021-06-19 12:19:37 zipper I don't understand what you mean :)
2021-06-19 12:19:39 danieldg zipper: the issue is that you *use* mwavefront again
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2021-06-19 12:20:06 zipper I see
2021-06-19 12:20:09 danieldg zipper: if you never used mwavefront (etc) it wouldn't be an issue
2021-06-19 12:20:25 danieldg becuase then those borrows could end around line 124
2021-06-19 12:20:35 bertptrs the compiler is allowed to drop things early if 1. you don't use it anymore and 2. the thing does not implement Drop
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2021-06-19 12:22:31 danieldg zipper: you either need to do all this with interior mutability (Cell, Mutex, etc) or use split_at_mut to divide the list of scores into the "write half" and "read half"
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2021-06-19 12:23:12 danieldg (assuming that you only read from indexes less than you write to)
2021-06-19 12:23:17 zipper Oh boy. I forgot those parts of Rust. I'll read up on interior mutability.
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2021-06-19 12:24:07 danieldg zipper: basically, this is safe if you use & not &mut
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2021-06-19 12:24:39 zipper danieldg: Yeah but I have use mut because I want to mutate what's inside it.
2021-06-19 12:24:51 danieldg if offsets is Vec<Cell<usize>> then you don't need &mut to change the values
2021-06-19 12:25:05 danieldg (Cell is nice here because it has no overhead)
2021-06-19 12:25:18 danieldg if you need thread-safety, use AtomicUsize
2021-06-19 12:28:08 bertptrs Cell has *minimal overhead. Having it present pessimizes certain compiler optimizations
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2021-06-19 12:35:15 zipper Thanks guys. I'll try it out and get back to you
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2021-06-19 13:18:50 meltyness :( I learned golang in like 8 hours
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2021-06-19 13:24:37 danieldg compared to RefCell or Mutex, though, Cell is really cheap. And I recall some of those optimizations are still turned off due to LLVM bugs.
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2021-06-19 13:28:54 Polochon_street hi! I have a library with a type `Analysis`, which consists of just several f32 fields, which can also just be transformed as a vec / arr1 using `to_vec` / `to_arr1`. I'd like to give the user the ability to implement custom distance metrics between two analyses, something like `custom_distance(&self, analysis2, <closure>)`
2021-06-19 13:29:35 Polochon_street and I'm wondering about which types the closure should take: two vecs? Two arr1? Two f32 arrays?
2021-06-19 13:29:36 danieldg Polochon_street: so like std does with comparators on sort_by?
2021-06-19 13:29:42 Polochon_street yes!
2021-06-19 13:30:02 Polochon_street I mean, most likely people will want to use arr1, because it's so much easier to do operations with
2021-06-19 13:30:31 danieldg you could provide wrappers that convert as needed, like sort_by_key does
2021-06-19 13:30:33 Polochon_street but I'm not really sure whether that's good?
2021-06-19 13:30:53 danieldg (sort_by_key is just a wrapper that builds a sort_by closure)
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2021-06-19 13:34:20 talin hello. i am wondering what 2usize.pow() is here: Counter::new(8).map(|n| 2usize.pow(n as u32)).collect();
2021-06-19 13:35:11 demize It calculates 2 to the power of n.
2021-06-19 13:35:14 danieldg 2_usize (with or without _) means 2
2021-06-19 13:35:15 talin is that the same as "2 as usize"? and then calling pow() on that?
2021-06-19 13:35:21 danieldg yes
2021-06-19 13:35:26 talin hmm, i see
2021-06-19 13:35:30 talin thank you
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2021-06-19 14:27:54 Polochon_street https://play.rust-lang.org/?version=stable&mode=debug&edition=2018&gist=6a06d8511df6d2bcc68bd97768760eaf how does that look?
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2021-06-19 14:28:27 Polochon_street I'm afraid that by making `F` (in custom_distance) taking &[f32], users won't realize using Array1 would be easier
2021-06-19 14:29:11 Polochon_street but then if I change the signature to `Array1<f32>`, I guess users would depend on ndarray (though my crate already depends on it, not sure whether that changes anything)
2021-06-19 14:31:11 danieldg Polochon_street: expose both if you think people would find them useful
2021-06-19 14:31:30 danieldg Polochon_street: also, prefer FnMut to Fn if you are asking for a closure
2021-06-19 14:31:48 danieldg or even FnOnce
2021-06-19 14:32:29 Polochon_street danieldg: how could I expose both of them?
2021-06-19 14:32:37 danieldg two functions
2021-06-19 14:33:19 j`ey does Array1<f32>: Into<&[f32]> or some other conversion?
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2021-06-19 14:35:31 Polochon_street I think it does
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2021-06-19 17:18:55 Arnavion Can you use slice patterns to make a &[T] as a &[T; N] without having to write N individual bindings in the pat?
2021-06-19 17:19:41 <-- ziper (~deamon@212.237.171.46) has quit (Ping timeout: 268 seconds)
2021-06-19 17:20:43 Arnavion Something like let s: &[u8] = ...; match s { [foo @ [u8; 16], bar @ [u8; 4]] => { /* foo: &[u8; 16], bar: &[u8; 4] */ } } instead of having 20 bindings or doing split_at(16) + two try_into()s
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2021-06-19 17:22:36 mebus Hi! I am new to rust. I have got a zip::read::ZipFile object. Is it possible to read from it line by line?
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2021-06-19 17:23:27 Arnavion It impls std::io::Read, yes https://docs.rs/zip/0.5.13/zip/read/struct.ZipFile.html#impl-Read
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2021-06-19 17:23:52 Arnavion So just like an std::io::Read impl, you can put it in a std::io::BufReader and use its read_line()
2021-06-19 17:24:20 GreenJello it doesn't seem to specify what the Read produces, though
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2021-06-19 17:24:56 Arnavion The file contents
2021-06-19 17:26:30 GreenJello oh, by "zip file" it means "file in a zip file"?
2021-06-19 17:26:56 bertptrs As opposed to ZipArchive, yes
2021-06-19 17:27:01 Arnavion Yes
2021-06-19 17:27:40 Arnavion Reading a .zip line-by-line wouldn't have made sense in the first place
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2021-06-19 17:32:11 Polochon_street hi again, I pasted https://play.rust-lang.org/?version=stable&mode=debug&edition=2018&gist=b54231eef6c3ea9dc7de0b1a325298bb earlier today, and I have another dilemma - should any `distance` function live in `Analysis`, actually? Since I can access `Analysis` from `Song`, would it make sense to put all the distance functions in `Song`?
2021-06-19 17:32:37 Polochon_street `Analysis` is only there because it can also be pretty-printed with named fields (not shown here)
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2021-06-19 17:33:01 Polochon_street it seems a bit silly to have `song.distance()` that calls in turn `song.analysis.distance()` tbh
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2021-06-19 18:04:48 kee Polochon_street: Can you get around this with dereferencing?
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2021-06-19 18:08:45 Polochon_street kee: how would you do that?
2021-06-19 18:09:05 Polochon_street (`Song` has more fields than that, I've removed them for simplicity's sake)
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2021-06-19 18:25:51 Wilfred what's the best way to see if a Vec<String> contains a &str?
2021-06-19 18:25:53 Wilfred https://play.rust-lang.org/?version=stable&mode=debug&edition=2018&gist=52f296b87822be0055aa5efba73d3bed
2021-06-19 18:26:08 Wilfred usually I can use &str and &String interchangeably, so this case caught me out
2021-06-19 18:26:55 j`ey maybe: .iter().any(|v| v == s)
2021-06-19 18:27:16 daemon could do with some function like perls 'ref' that just returns a stringified version og type
2021-06-19 18:27:27 daemon just as a utility lib would be nice
2021-06-19 18:27:46 j`ey what you wrte doesnt work because the contains function wants &T (aka &String)
2021-06-19 18:28:12 Wilfred so does this mean I can treat a &String as a &str, but the reverse isn't true?
2021-06-19 18:28:25 j`ey yes
2021-06-19 18:28:34 j`ey daemon: https://doc.rust-lang.org/std/any/fn.type_name.html but a bunch of caveats
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2021-06-19 18:28:47 daemon ah I see
2021-06-19 18:28:56 Wilfred j`ey: gotcha
2021-06-19 18:35:41 cehteh also prolly you want &Vec<String> or do you want to consume the vec?
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2021-06-19 19:34:37 wilfred cehteh: yep, you're right. Just trying to keep my repro small :)
2021-06-19 19:35:18 cehteh huh?
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2021-06-19 19:53:27 meltyness https://doc.rust-lang.org/std/error/trait.Error.html#method.description
2021-06-19 19:53:34 meltyness :( who the heck is to_string a member of?
2021-06-19 19:54:16 danieldg Display
2021-06-19 19:54:43 danieldg or just search it
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2021-06-19 19:55:15 meltyness std::fmt::Display? :(
2021-06-19 19:56:03 cehteh https://doc.rust-lang.org/std/string/trait.ToString.html#tymethod.to_string
2021-06-19 19:56:08 meltyness I'm trying to implement a custom error to take advantage of rust's robust error handling from the guessing-game example
2021-06-19 19:56:27 danieldg you just need to impl Display
2021-06-19 19:56:36 cehteh yes
2021-06-19 19:56:49 cehteh .. and use the search box on the top :)
2021-06-19 19:57:32 meltyness I gave up on Display because the "fn fmt(...) -> Result<(), std::fmt::Error>" is too abstract for me to understand
2021-06-19 19:58:27 danieldg meltyness: look at the example in the docs
2021-06-19 19:58:29 substack just copy paste the example and change the message. you don't need to understand it
2021-06-19 19:59:05 meltyness oh, i see with the "write!" macro?
2021-06-19 19:59:10 danieldg yep
2021-06-19 20:00:06 meltyness a-HA! thanks guys :)
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2021-06-19 20:02:15 sklv hi, i'm trying to read ffmpeg progress output from a childstderr so I can display progress.
2021-06-19 20:03:05 sklv the rust cookbook way with lines() works for non progress status lines presumably because theyre newline terminated, but not progress lines, because they're the kind that are like 'dynamic' - each new one replaces the last one in the terminal instead of appending to it
2021-06-19 20:03:25 sklv so i'm trying to read the whole buffer every time, and then improve on that
2021-06-19 20:03:46 danieldg sklv: split on \r or whatever it uses to go back
2021-06-19 20:04:07 sklv I have tried this: https://dpaste.com/CLTS87LZP but with the read_to_string approach, I get nothing at all
2021-06-19 20:04:30 danieldg sklv: first, be sure that ffmpeg actually displays output to stderr when stderr is not a terminal
2021-06-19 20:04:48 danieldg it might be calling isatty() and not doing things if not
2021-06-19 20:04:55 danieldg ChildStderr is a pipe
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2021-06-19 20:06:05 sklv WRT isatty(), that may well be the case, but I get some initial output with lines, so I should be able to at least get the same with buffer
2021-06-19 20:07:03 danieldg sklv: read_to_string reads the *whole* thing
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2021-06-19 20:07:27 danieldg it doesn't stop at end of line or when there's no more data, it wants for EOF
2021-06-19 20:08:40 sklv right, so I want just read()
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2021-06-19 20:10:50 oneforall2 hi will this work for the miri fix ? export RUSTFLAGS="$RUSTFLAGS -Zalways-encode-mir"
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2021-06-19 20:13:36 meltyness https://play.rust-lang.org/?version=stable&mode=debug&edition=2018&gist=ef6d4a958cf36dafa8945e4cdb10e77b here's some error handling so nice that it breaks the playground. :D
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2021-06-19 20:14:51 bluefox Would Rust be appropriate for an RV64IC CPU (no M extension) with 8K of instruction memory and 8K of data memory, as an embedded language?
2021-06-19 20:16:05 danieldg you wouldn't be able to use std or even most of the non-trivial core features in that small of a space
2021-06-19 20:16:36 danieldg no idea if rust supports that cpu, you need to check that too
2021-06-19 20:16:45 danieldg but otherwise, sure
2021-06-19 20:16:49 bluefox yeah, it'd be nostd. Mostly for controlling a PPU in ~700 cycle bursts between drawing lines, and in the 300,000 cycle space between vblank
2021-06-19 20:17:34 bluefox yeah, I saw a compile target for RV32IMC from 2018, wasn't sure if M was strictly required in embedded use (probably, with the multiplication/division operations in the language)
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2021-06-19 20:18:28 sklv danieldg: it works! thanks a lot
2021-06-19 20:19:12 danieldg bluefox: multiplies can creep in from lots of things, but if LLVM supports it they can be eliminated
2021-06-19 20:19:42 bluefox oh, it's wholly whatever LLVM can output, not something special about rust
2021-06-19 20:19:55 danieldg rust uses llvm for the backend, yes
2021-06-19 20:20:04 bluefox that makes things easier
2021-06-19 20:20:14 danieldg so rust itself will likely emit multiplies, but llvm can convert them to shift/add/etc
2021-06-19 20:21:13 bluefox I'm worried some of this is going to be tricky, with the instruction fetch operating on one memory bus and the data bus on another
2021-06-19 20:21:48 danieldg the usual text/data section splits should handle that
2021-06-19 20:22:17 bluefox makes sense
2021-06-19 20:22:41 bluefox the text area is entirely impossible to read, physically
2021-06-19 20:23:18 danieldg that's fine, as long as it's possible to initialize data too
2021-06-19 20:23:37 bluefox yeah, both are written by dma through a memory controller, controlled by some other microcontroller
2021-06-19 20:24:07 oneforall2 well that didn't work
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2021-06-19 20:24:34 danieldg then it should be as simple as write text to the code memory, write data/rodata to data section, set up stack pointer, start
2021-06-19 20:36:46 oneforall2 MIRIFLAGS="-Zalways-encode-mir" this might do it
2021-06-19 20:37:47 bluefox cool. I'll ave a look at this. Thanks dan.
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2021-06-19 20:50:02 meltyness :) I guessed the syntax, and now better understand the application of multiple traits to a generic type. wow!
2021-06-19 20:50:47 meltyness Rust looks so much like system specifications, I love it -- who wants to think about a spec after the spec has already been written?!
2021-06-19 20:51:27 meltyness It's like prolog except the compiler isn't an asshole!
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2021-06-19 21:24:05 meltyness username: String::from("horse_ebooks") lol
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2021-06-19 23:15:07 substack is there something like Promise.all in rust async? also acceptable would be something that takes an iterator and runs N parallel tasks at a time
2021-06-19 23:15:44 danieldg substack: select or join from the futures crate
2021-06-19 23:16:18 DeeEff_ danieldg: it's likely substack is looking for `FuturesOrdered` or `FuturesUnordered`, but select also works
2021-06-19 23:16:20 substack join does 2 futures at a time
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2021-06-19 23:16:51 jbg substack: did you perhaps look right next to join in the documentation, for example join_all?
2021-06-19 23:16:56 danieldg substack: the join macro should support arbitrary numbers
2021-06-19 23:17:13 jbg DeeEff_: select would be promise.any, not promise.all
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2021-06-19 23:18:09 DeeEff_ In general you probably want all your tasks to finish, so `FuturesUnordered` tends to be preferable
2021-06-19 23:18:17 substack ok looks like join_all does what i want
2021-06-19 23:18:24 jbg futures::join is a macro that supports arbitrary numbers. then there's the fns futures::future::join, join3, join4, join5 which support 2/3/4/5, then there's join_all which does arbitrary numbers
2021-06-19 23:18:30 jbg DeeEff_: join waits for all the futures to complete
2021-06-19 23:19:05 DeeEff_ I know what join does :)
2021-06-19 23:19:47 jbg ok, was just a bit confusing that you push futuresunordered on the basis that "you want all your tasks to finish", when join does that with much less complexity
2021-06-19 23:20:09 DeeEff_ I don't know if I agree that join is less complex
2021-06-19 23:20:11 jbg futuresunordered is great if you want some of the advanced features it offers like pushing futures into the buffer once they are already running etc
2021-06-19 23:20:29 jbg but if you simply want the equivalent of promise.all, join is clearly the simpler solution
2021-06-19 23:20:50 DeeEff_ it is more rigid, but that isn't "less complex." Calling `collect` on an iterator into a `FuturesUnordered` sounds closer to what was asked for
2021-06-19 23:21:27 DeeEff_ ¯\_(ツ)_/¯
2021-06-19 23:21:52 jbg in what way is it closer to what was asked for?
2021-06-19 23:22:05 DeeEff_ > also acceptable would be something that takes an iterator and runs N parallel tasks at a time
2021-06-19 23:22:16 DeeEff_ It was in the message
2021-06-19 23:22:36 jbg the actual question (i.e. the part that you cut out of your copy-paste, as opposed to the "also acceptable" part) was "is there something like promise.all in rust async?"
2021-06-19 23:22:57 jbg promise.all and join_all are basically identical
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2021-06-20 00:51:26 oneforall2 ok had to change from python3 x.py dist to python3 x.py build
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2021-06-20 01:38:11 substack this lifetime mismatch error is not helpful at all. expected type and found enum are identical
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2021-06-20 02:19:36 jbg what is "this lifetime mismatch error"?
2021-06-20 02:19:45 jbg maybe paste it?
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2021-06-20 02:27:44 cehteh mhm is it somehow possible to construct a BTreeMap<&str, String> where the key is a slice into the value (aka, same lifetime and value must be immutable)?
2021-06-20 02:28:19 substack https://gist.github.com/substack/cdc6ffc7b9058c8d3d11314e56dc04d1
2021-06-20 02:29:15 cehteh i know BtreeSet with custom compare could do that, just wondering if doable with BTreeMap somehow
2021-06-20 02:29:41 substack i've gotten this type of vague error before and it was very annoying to figure out and the msg wasn't helpful then either
2021-06-20 02:31:37 cehteh hah i seen similar things ... which also WTF'ed me
2021-06-20 02:34:02 substack just trying to speed up this batch processing program so it finishes in several days instead of several months
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2021-06-20 02:36:57 cehteh eh work.push(spawn(async move { doesnt that need to be work.push(spawn(async move || {
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2021-06-20 02:40:25 bertptrs move || async {} more like?
2021-06-20 02:40:38 bertptrs or have async closures been stabilized while I wasn't looking
2021-06-20 02:41:19 substack this is on nightly with feature(async_closure)
2021-06-20 02:41:24 cehteh havent done that stuff yet, it just catched my eye
2021-06-20 02:41:51 cehteh but i expected you need a || to make a closure
2021-06-20 02:43:45 substack it doesn't work if you put ||
2021-06-20 02:44:28 cehteh have you considered to parallize that with rayon or similar?
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2021-06-20 02:45:44 substack i really don't want something so magical for processing 8 billion records
2021-06-20 02:46:36 substack the first phase of the processing uses a lib that uses rayon and the results are very underwhelming
2021-06-20 02:47:11 substack after i get this part ported i want to go in and rip rayon out actually so i can be more explicit to get the processing time down
2021-06-20 02:51:19 substack also i have no idea how rayon and async are supposed to work together, if at all
2021-06-20 02:53:21 jbg unless I missed it, you still didn't paste the error message that you were complaining about?
2021-06-20 02:53:27 cehteh ah ok
2021-06-20 02:53:39 cehteh jbg: its below
2021-06-20 02:53:53 jbg oh, there's two files in the gist, cool
2021-06-20 02:54:43 jbg yeah, that is a rubbish error message. used to get those a lot in the early days of futures but haven't seen one that bad in a while
2021-06-20 02:56:09 jbg is this OSM data? at a previous $job we used rayon to import the whole planet, the performance was fantastic (rayon is not very magical btw)
2021-06-20 02:56:57 jbg async doesn't really gain you much for cpu-intensive batch processing where you have all the data coming at a predictable rate from nearby storage
2021-06-20 02:57:43 substack the library i'm pumping data into is async, i can't easily change that
2021-06-20 02:57:52 cehteh i havent used rayon yet, but i heared similar things .. must be something wrong when it doesnt perform well
2021-06-20 02:58:19 cehteh too much contention on locks, too much shared data?
2021-06-20 02:58:45 substack i don't like abstractions that don't give you anything go on when they don't work and rayon is exactly that. and for performance it's really important that you can juggle things around manually
2021-06-20 02:59:06 cehteh eventually i want to make a lock contention measurement thingy ... but not now
2021-06-20 02:59:13 jbg you could try using tokio rather than async-std, in our (admittedly limited) testing the performance is much better (although we haven't bothered re-checking recently, maybe they've improved) and it looks like your error is coming from there
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2021-06-20 05:03:52 mebus Arnavion: thanks! I found a solution to read line by line.
2021-06-20 05:04:42 mebus I am trying to use the build.rs script from here: https://docs.rs/prost-build/0.7.0/prost_build/ but for some reason it never gets executed. Can somebody help me to find out why?
2021-06-20 05:06:28 bertptrs where did you put your build.rs?
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2021-06-20 05:08:31 mebus bertptrs: where my Cargo.toml is
2021-06-20 05:08:44 mebus and the project source files are in src/
2021-06-20 05:08:49 bertptrs That should work
2021-06-20 05:09:07 j`ey mebus: add a panic!() to your build.rs
2021-06-20 05:10:26 mebus this is my build.rs: https://gist.github.com/Mebus/8be410087eee762bfd2c77429ff4fad0 do I need to return a Result?
2021-06-20 05:10:54 j`ey are you thinking it's not running because you dont see the println?
2021-06-20 05:11:21 mebus j`ey: yes and I don't see the source files of protobuf being generated...
2021-06-20 05:11:28 mebus with panic I see the println
2021-06-20 05:11:34 j`ey because i dont think println is output to stdout by default
2021-06-20 05:11:37 j`ey so your build.rs is running
2021-06-20 05:11:42 mebus ah o
2021-06-20 05:11:44 mebus k
2021-06-20 05:11:50 mebus how can I print something to the screen?
2021-06-20 05:12:02 j`ey mebus: where are you looking for the protobuf source files?
2021-06-20 05:12:22 mebus in the src dir?
2021-06-20 05:12:28 j`ey it doesnt go to there
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2021-06-20 05:12:31 bertptrs They should be in the OUT dir
2021-06-20 05:12:32 j`ey it's in the build dir
2021-06-20 05:12:41 j`ey target/debug/something/build
2021-06-20 05:12:57 j`ey if youre on something unixy run: find target -name '*.rs'
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2021-06-20 05:14:58 mebus j`ey: ah, yeah. there is a file that makes sense.
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2021-06-20 05:22:33 mebus I am doing this example: https://docs.rs/prost-build/0.7.0/prost_build/ What do I have to write into my main.rs to use times::Shirt::default() in my main.rs?
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2021-06-20 05:31:55 dav1d I have a trait with the method `fn parse(&self, fields: &[FieldSpecifier], data: &[u8]) -> Option<Self::Output>;` how would I implement this trait and have the lifetime of Self::Output bound to `data`?
2021-06-20 05:32:13 SpaceManiac dav1d: not possible
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2021-06-20 05:32:22 SpaceManiac or, rather, the trait definition would have to change
2021-06-20 05:32:36 dav1d SpaceManiac, then how do I have to change the trait definition?
2021-06-20 05:33:13 dav1d I tried giving `parse` a lifetime `parse<'a>(...)` but I can't figure out how to apply that to the output
2021-06-20 05:33:22 j`ey mebus: 'use crate-name;' at the top of main.rs, and then crate-name::items::Shirt..
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2021-06-20 05:39:26 SpaceManiac dav1d: hmm, actually I think it really isn't possible, unless I'm failing to recall a trick
2021-06-20 05:40:18 dav1d SpaceManiac, yeah this turns out to be quite tricky...
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2021-06-20 05:41:35 SpaceManiac maybe look at nom or serde for possible approaches
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2021-06-20 05:43:57 bertptrs mebus: copy the thing with pub mod … include!
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2021-06-20 05:44:46 kee dav1d: Make Self::Output generic over 'a?
2021-06-20 05:44:56 kee Wrong words, but `where Self::Output: a
2021-06-20 05:46:06 mebus bertptrs: ah, this solved it
2021-06-20 05:49:00 dav1d kee, can you show me? A basic setup: https://play.rust-lang.org/?version=stable&mode=debug&edition=2018&gist=6c8ee643fe0a83f344dcfcbf0484e2f0
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2021-06-20 05:54:05 dav1d Does this work or am I missing something? https://play.rust-lang.org/?version=stable&mode=debug&edition=2018&gist=a3aec0935acbf95fa29e619df6001fb5 SpaceManiac, kee
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2021-06-20 05:57:36 SpaceManiac yeah, looks fine, I ran into 'unused lifetime' errors when I was checking earlier but must have just mistyped something. shouldn't be trying to give advice while up this late
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2021-06-20 05:58:31 dav1d I don't quite understand why it works, yet
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2021-06-20 06:03:44 dav1d yeah it doesn't work, I can't really store a parser in another struct, because I run into issues with lifetimes
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2021-06-20 06:05:11 SpaceManiac dav1d: do you rely on the parser->output relationship, or can you flip the trait? trait ParseFrom<'a> { type State; fn parse_from(state: &State, data: &[u8]) -> Self; }
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2021-06-20 06:06:54 dav1d SpaceManiac, my actual usecase is, I have a Session that receives packets (&[u8]), which stores some state, then calls the parser multiple times on a slice of that &[u8] and yields an iterator of the parser results
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2021-06-20 06:09:59 dav1d something like this: https://play.rust-lang.org/?version=stable&mode=debug&edition=2018&gist=cad61b690b4e7bec148f6b2a1a27539b
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2021-06-20 06:14:26 mebus I am working with a strings on multiple spots in a if-else construct, but I keep getting "error: cannot borrow `pf` as mutable because it is also borrowed as immutable" - what can I do about it? I don't really understand why this is not working.
2021-06-20 06:14:37 j`ey paste the code!
2021-06-20 06:14:39 mebus do I have to clone the string or something?
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2021-06-20 06:16:02 dav1d Intersting it works with a Vec<>, but not with the `impl Iterator`
2021-06-20 06:17:11 mebus j`ey: https://gist.github.com/Mebus/661f848acf244019e1ed5bbd5a244eb8
2021-06-20 06:17:25 mebus I cannot compare to s twice, only once.
2021-06-20 06:18:25 j`ey mebus: it's probably due to 'pf.name()', what type does that return?
2021-06-20 06:19:21 mebus j`ey: should return a &str ?
2021-06-20 06:19:28 j`ey mebus: you tell me!
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2021-06-20 06:20:56 j`ey mebus: does it actually work with those clones?
2021-06-20 06:21:10 mebus j`ey: no, doesn't work with the clones
2021-06-20 06:21:12 mebus pub fn name(&self) -> &str
2021-06-20 06:21:32 mebus is it really so complicated to compare a string in Rust? ^^
2021-06-20 06:21:35 SpaceManiac mebus: `let mut s = pf.name().to_owned()` then remove the clones
2021-06-20 06:21:55 j`ey mebus: it's not about the string, it's about pf
2021-06-20 06:22:02 SpaceManiac the complication is that ZipFile's API doesn't _promise_ that calling .read_to_end won't modify the name
2021-06-20 06:22:14 j`ey it's because you have a &str from pf, and then try to call a &mut method on pf
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2021-06-20 06:24:10 mebus SpaceManiac: that doesnt help
2021-06-20 06:24:20 dav1d `impl Iterator<Item = <P as Parser<'a>>::Output>` this seems to work, just randomly change stuff until the compiler spits an error out that you can partially copy and paste until it compiles
2021-06-20 06:24:45 mebus dav1d: are you talking to me?
2021-06-20 06:24:52 SpaceManiac mebus: surely it changes the error message at least a little
2021-06-20 06:25:08 ChaiTRex mebus: Don't clone to compare an &str or String to a string literal.
2021-06-20 06:25:12 ChaiTRex evalr2: let x: &str = "test"; let y: String = "test".to_owned(); (x == "test", y == "test")
2021-06-20 06:25:17 -- Notice(evalr2): ChaiTRex: (true, true)
2021-06-20 06:25:17 dav1d mebus, no
2021-06-20 06:25:45 mebus SpaceManiac: https://gist.github.com/Mebus/845452075fe3c2d5eb32324a9a915eed
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2021-06-20 06:26:14 SpaceManiac zip.start_file(&s, ...
2021-06-20 06:28:11 mebus SpaceManiac: ah, thanks. That fixed it :-)
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2021-06-20 06:58:46 Midjak Hi is There some tools for refactoriing in Rust ecosystem ? As something to rename a function by instance
2021-06-20 06:59:24 j`ey rust-analyzer can do that https://rust-analyzer.github.io/manual.html#rename
2021-06-20 06:59:50 Midjak hi j`ey Thank you
2021-06-20 06:59:57 Midjak I am looking this
2021-06-20 07:02:58 Midjak ah It is an LSP Server... I had tried this on emacs/osx but I couldn't get it to work
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2021-06-20 07:04:54 mebus I have got a question regarding `match`: https://gist.github.com/Mebus/72c0809ef1ad190488a2ef49086321cb Can I print and return something on Err?
2021-06-20 07:05:36 j`ey mebus: => { print!(..); Err(..) }
2021-06-20 07:06:04 j`ey mebus: => { print!(..); expimp::JobInfo::default() } rather
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2021-06-20 07:13:47 flipchan Hey, I have a struct(pub struct testing{pub lorem: String, pub ipsum: String,}) and I want to
2021-06-20 07:13:50 flipchan implement a default value for it, so it will say like struct{"hey1", "hey2"}, how can I do that?
2021-06-20 07:14:07 j`ey flipchan: implement the default trait
2021-06-20 07:14:47 flipchan fn default() -> Self {"test", "test", }
2021-06-20 07:14:55 flipchan im doing something wrong here
2021-06-20 07:15:15 j`ey is that exactly what youre writing?
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2021-06-20 07:16:01 flipchan i want the user to be able to use Default::default() and then it should auto set 2 preconfigured strings
2021-06-20 07:16:15 j`ey yes that's what the Default trait is for
2021-06-20 07:16:49 j`ey but if 'fn default() -> Self {"test", "test", }' is all you wrote.. that's not really valid rust
2021-06-20 07:18:01 flipchan here: https://dpaste.com/A4PNHRSN6 check it out
2021-06-20 07:18:31 Mutabah `Self { lorem: "...".into(), ... }` is what you want
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2021-06-20 07:18:38 Mutabah I.e. within the body
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2021-06-20 07:18:49 Mutabah `-> Self { Self { ... } }`
2021-06-20 07:19:21 j`ey flipchan: you should read the rust book!
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2021-06-20 07:20:38 flipchan Mutabah, ofc. im to tired today haha
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2021-06-20 08:20:03 euouae Hello
2021-06-20 08:20:26 jbg hello
2021-06-20 08:20:35 euouae Rust newbie here
2021-06-20 08:21:15 capitol welcome
2021-06-20 08:21:44 euouae Thanks :)
2021-06-20 08:21:54 euouae Does anyone use emacs?
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2021-06-20 08:26:12 Midjak yes euouae ?
2021-06-20 08:26:47 euouae Midjak: What kind of features do you use & how did you set it up?
2021-06-20 08:28:00 euouae Midjak: I installed rust-analyzer and rustic but it feels kind of clunky
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2021-06-20 08:31:18 Midjak I use rust-mode without LSP. I didn't get it to work. I use clippy from the command line. but rust-fmt works as expected. What is your OS ?
2021-06-20 08:31:38 euouae Ok so you also have issues then, I use Ubuntu
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2021-06-20 08:33:39 Midjak yes, but I didn't insist, I will try again soon. I need to read deeply documentation about this and rust-analyzer.
2021-06-20 08:33:58 Midjak What is your issue with rust-analyzer ?
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2021-06-20 08:35:34 euouae My main issue is that I don't understand how to use rustic; where are the docs?
2021-06-20 08:37:53 Midjak I don't know I use rust-mode and the README is only doc I read
2021-06-20 08:38:41 Midjak I guess there is only the README documentation about mode in emacs a rarely documented extpected for te big framework as proof general or elpy
2021-06-20 08:39:33 Midjak Try rust fmt. It works out the box (if you don't need to run clippy from emacs)
2021-06-20 08:39:35 euouae Yeah I think documentation could improve, or maybe I'm not getting the sense of it
2021-06-20 08:39:58 euouae What is rust fmt?
2021-06-20 08:40:05 Midjak a formatter
2021-06-20 08:41:00 Midjak https://github.com/rust-lang/rustfmt
2021-06-20 08:42:00 Midjak try clippy too https://github.com/rust-lang/rust-clippy it's a good mean to learn about Rust
2021-06-20 08:42:41 Midjak but as as said you need to run it from command-line if you don't have rust-anlyzer
2021-06-20 08:43:05 euouae Ah I can get that to work
2021-06-20 08:44:02 Midjak try clippy and rustfmt from command line first. if it works try from emacs.
2021-06-20 08:44:16 euouae Midjak: I Think, here is my understanding of the rustic documentation (it just occured to me) they only mention the relevant Emacs function names, such as 'rustic-format-buffer' and then you're supposed to do 'C-h v rustic-format-buffer' to read what it is bound to
2021-06-20 08:44:17 Midjak C-c C-F launch rust-fmt
2021-06-20 08:44:32 euouae Midjak: I've actually gotten it to work to format on save
2021-06-20 08:44:39 Midjak ok
2021-06-20 08:45:21 Midjak so it works, no ?
2021-06-20 08:46:19 Midjak I can help you with rustic I use rust-mode
2021-06-20 08:46:27 euouae I'm also getting an issue right now
2021-06-20 08:46:33 euouae which seems to stem from my incorrect rustup installation
2021-06-20 08:46:57 euouae I tried modifying RUSTUP_HOME and CARGO_HOME when I installed, but when I updated the installation they were not exported, and I think that broke some things; in particular rust-analyzer now has some issues with workspace loading
2021-06-20 08:47:30 euouae How can I start a fresh installation of rust? Maybe I should do that
2021-06-20 08:47:32 j`ey yeah you need to make sure to keep them exported in your shell
2021-06-20 08:48:01 euouae j`ey: can I uninstall now or will rustup delete things it shouldn't? Is there a dry run of an uninstall?
2021-06-20 08:48:38 j`ey i dont see a reason to uninstall it now, just set those variables
2021-06-20 08:48:54 euouae I did but it seems to
2021-06-20 08:49:18 euouae give LSP :: rust-analyzer failed to load workspace: "cargo" "--version" failed: No such file or directory (os error 2)
2021-06-20 08:49:30 euouae and there's this https://github.com/rust-analyzer/rust-analyzer/issues/3032
2021-06-20 08:50:08 j`ey well as i said, rustup currently just deletes the folders that it uses
2021-06-20 08:50:21 j`ey so if you had done the .local/bin thing, it would delete everything in there
2021-06-20 08:50:43 j`ey maybe it cant find vargo
2021-06-20 08:50:45 euouae I did not, I instead just set CARGO_HOME and RUSTUP_HOME to ~/.local/{cargo, rustup}
2021-06-20 08:50:45 j`ey *cargo
2021-06-20 08:51:08 euouae Hm... ok /maybe/ it's an issue with Emacs more than rust
2021-06-20 08:51:56 euouae I'm seeing with M-x getenv that CARGO_HOME and RUSTUP_HOME are not defined
2021-06-20 08:52:36 Midjak yes because you launch emacs from your desktop menu. no ?
2021-06-20 08:52:42 euouae well, of course! ~/.profile is not related to emacs
2021-06-20 08:52:44 Midjak try from command line
2021-06-20 08:52:50 euouae Midjak: I launch it as a daemon
2021-06-20 08:53:05 Midjak ok you need to set the env here
2021-06-20 08:53:21 Midjak I don't remember how to but I know it's possible
2021-06-20 08:54:27 euouae Thanks, I think I'm realizing what is going on now
2021-06-20 08:54:41 Midjak I have seen you find #emacs channel ;-)
2021-06-20 08:55:21 euouae Yeah I wasn't trying to involve two channels for one issue, I was trying to separate things to corresponding channels :)
2021-06-20 08:57:05 Midjak fair enough
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2021-06-20 10:22:40 la_mettrie do I/O examples like this contain sufficient error handling for a real program? https://pastebin.com/raw/wDdzFChY
2021-06-20 10:23:04 la_mettrie the user is not going to get more information in addition to fail/success
2021-06-20 10:24:07 bertptrs depends on the kind of user. if this runs on a server and is debugged by an op, this is fine. If this is a user facing cli thing, you'd need a bit more
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2021-06-20 10:25:42 la_mettrie i'm thinking about a drawing program trying to open a file
2021-06-20 10:26:02 mike-burns If it's a GUI you'd probably want to show a dialog instead of outputting to stderr.
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2021-06-20 10:27:40 la_mettrie i mean, if that function fails, then we can tell to the user that loading failed. but is that enough?
2021-06-20 10:27:49 bertptrs likely, yes
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2021-06-20 10:28:04 euouae You should also log the failure with a logger
2021-06-20 10:28:18 mike-burns Are you asking about the error message itself?
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2021-06-20 10:28:58 la_mettrie yes, i've been trying to find out how to get more specific error messages but i'm not sure if those functions even return more than success/fail
2021-06-20 10:29:27 mike-burns That message comes from the OS.
2021-06-20 10:29:45 mike-burns "No such file or directory", right?
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2021-06-20 10:30:41 la_mettrie yes, i'd like to see an example which extracts those messages
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2021-06-20 10:31:40 mike-burns > Error: Os { code: 2, kind: NotFound, message: "No such file or directory" }
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2021-06-20 10:33:21 mike-burns The common answer is to use the anyhow crate.
2021-06-20 10:35:38 bertptrs or not because you don't really need it
2021-06-20 10:37:32 bertptrs if you want to know the actual message, you can `to_string()` it, or use the Display implementation directly
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2021-06-20 10:40:23 la_mettrie so i guess i have to use hours and hours to find out how this works
2021-06-20 10:40:32 bertptrs and in the case of an io::Error, you can use the kind() method to get an enum which sort of covers most cases
2021-06-20 10:40:37 la_mettrie or maybe not
2021-06-20 10:43:48 jbg that function doesn't just return success/fail, it returns success or an io::Error which tells you exactly why it failed
2021-06-20 10:44:14 jbg so the function as written is fine in terms of error reporting; it's up to the caller of the fn to do something appropriate with the error
2021-06-20 10:44:49 jbg if it's really main(), then I think it prints the Err variant if it exits with one, which should give enough info in general
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2021-06-20 10:52:09 la_mettrie this doesn't work Err(err) => error = err.kind().to_string(),
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2021-06-20 11:10:33 osse why not?
2021-06-20 11:11:57 la_mettrie error variable is string and it returns enum 'ErrorKind'
2021-06-20 11:12:06 la_mettrie i should know how to get string out of that enum if it contains one
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2021-06-20 11:32:24 bertptrs ErrorKind does not contain a string, it is a representation of a lower level os error integer
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2021-06-20 11:37:46 la_mettrie yeah, i have to study how to get those error messages out from there
2021-06-20 11:39:28 la_mettrie most of enum tutorials just tell how to get stuff out of enum if you already know what's in there
2021-06-20 11:39:40 bertptrs There are no strings in there
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2021-06-20 11:40:21 la_mettrie yes, whatever there is, i should get it out
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2021-06-20 11:40:48 bertptrs It is undefined what's in there
2021-06-20 11:41:03 bertptrs (but practically it's an integer)
2021-06-20 11:41:08 la_mettrie yes, i have to study how to get undefined stuff out of enum
2021-06-20 11:41:16 bertptrs You can't
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2021-06-20 11:42:09 bertptrs What are you even trying to do
2021-06-20 11:42:55 la_mettrie trying to get those I/O error messages so that i could convert them into strings and show to the user
2021-06-20 11:43:35 bertptrs You can get an approximation by converting the std::io::Error to a string, or you can match on ErrorKind and write the strings yourself. Those are the options
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2021-06-20 11:45:19 routeveg Lo all
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2021-06-20 11:46:03 routeveg What's the 'nicest' way to read a number of bytes from a stream into a Vec<u8> ?
2021-06-20 11:46:43 routeveg Currently, i'm making a Vec, resizing it to the # of bytes I want to read, then doing a Reader.read_exact(vec.as_mut_slice())
2021-06-20 11:47:43 bertptrs That
2021-06-20 11:48:07 bertptrs is already pretty much what you want to do. instead of vec.as_mut_slice() you can use &mut vec
2021-06-20 11:48:47 routeveg Hmm, ok. I guess the most unsatisfactory part of this is how I am doing a Vec::resize, which is zero-filling the memory. Then I am reading over those zeros.
2021-06-20 11:48:58 routeveg It'd be nice to skip the zero-filling step.
2021-06-20 11:49:12 routeveg I'm fairly sure it wouldn't matter most of the time, but seems like it should be possible.
2021-06-20 11:49:17 bertptrs you can combine create-vec + resize into a single vec![0; correct_length]
2021-06-20 11:49:31 bertptrs But efficient reading into uninitialized memory is unfortunately currently still unstable
2021-06-20 11:49:34 routeveg Regarding just passing the &mut vec directly: Oh interesting, how does that work?
2021-06-20 11:50:02 routeveg Is there some traity coercy thing going on? (I am pretty new to actually writing rust)
2021-06-20 11:50:11 bertptrs Vec<T> implement Deref<Target=[T]> and DerefMut. You can read more into the docs for those traits
2021-06-20 11:50:26 routeveg Oh, right. That's pretty great :)
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2021-06-20 11:55:30 routeveg Thanks for the guidance; this whole rust thing is pretty satisfying so far. I write C in my day job and while it's a shame to throw away all the good practices i've collected over the years...it feels like the ethical thing to do
2021-06-20 11:55:34 routeveg :P
2021-06-20 11:55:58 bertptrs all the good practices in C are just wallpaper over all the footguns
2021-06-20 11:56:10 bertptrs That said I've previously written C++ professionally so I know the pain
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2021-06-20 12:09:50 Moomoc_ What is the syntax for a function pointer with a mutable argument? I have tried `fn(mut String);` and `fn(mut m: String)`, but both don't work.
2021-06-20 12:10:06 danieldg the latter
2021-06-20 12:10:13 danieldg well wait
2021-06-20 12:10:17 danieldg function pointers don't care about this
2021-06-20 12:10:23 danieldg so it's not even there
2021-06-20 12:10:46 danieldg the mutability of an argument is an internal detail of the function, not part of its signature
2021-06-20 12:11:05 Moomoc_ mmh, for trait declarations it is :)
2021-06-20 12:11:21 danieldg only if you have a default impl
2021-06-20 12:11:40 danieldg and even then, it doesn't need to match on other impls
2021-06-20 12:11:58 Moomoc_ Ok, omitting the mut now gives me this error: https://paste.rs/Znt
2021-06-20 12:12:12 danieldg that's not an error
2021-06-20 12:12:24 Moomoc_ Right, one second
2021-06-20 12:13:08 Moomoc_ danieldg: https://paste.rs/W69
2021-06-20 12:15:33 danieldg Moomoc_: actually cast the functions to that type
2021-06-20 12:15:42 Moomoc_ ugh
2021-06-20 12:15:46 danieldg or don't use an Into argument
2021-06-20 12:15:57 danieldg just having that type as the argument would suffice
2021-06-20 12:16:03 Moomoc_ I don't use into
2021-06-20 12:16:11 danieldg Into or From
2021-06-20 12:16:22 Moomoc_ I use neither of them, see the original paste
2021-06-20 12:16:26 j`ey is add_dependency your code?
2021-06-20 12:16:28 j`ey or a crate?
2021-06-20 12:16:41 danieldg I'm talking about add_dependency
2021-06-20 12:16:50 Moomoc_ Ah, that's in a crate: topological-sort
2021-06-20 12:17:07 danieldg yeah, it is causing issues
2021-06-20 12:17:26 Moomoc_ Hehe, ok.
2021-06-20 12:17:28 danieldg it's trying to do conversions for you, and that's not helpful here
2021-06-20 12:17:56 Moomoc_ So do I fork or can I work around this?
2021-06-20 12:18:11 danieldg ts.add_dependency(perform_work2 as Fun, ...
2021-06-20 12:18:41 danieldg maybe this will be fixed in the future - it does make sense to have an Into impl that does this conversion
2021-06-20 12:19:26 danieldg but function not-yet-pointer objects are a bit hard to describe in the type system at the moment
2021-06-20 12:20:15 Moomoc_ I see. I could have went with trait objects, but that is overkill for my use case. Thanks for the explanation, I get the problem :)
2021-06-20 12:22:32 Moomoc_ Thanks for your help
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2021-06-20 12:27:22 routeveg Okay, hmm. I have a new thing - I want to define a new method on Result. That is, I want to add a function that can use the '.' syntax.
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2021-06-20 12:27:47 routeveg I tried to do the thing, and rustc says I can't add another impl outside the defining crate of Result
2021-06-20 12:28:02 danieldg routeveg: you need to make a trait and impl that trait for Result
2021-06-20 12:28:05 routeveg Feels like I don't actually want an Impl. I just want a function
2021-06-20 12:28:15 routeveg Oh okay, hmm. i'll poke around
2021-06-20 12:28:31 j`ey routeveg: look for 'extension traits' if youre going to search
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2021-06-20 13:55:44 routeveg Hey, so I am having some confusion around something it seems I should be able to do
2021-06-20 13:55:51 routeveg https://play.rust-lang.org/?version=stable&mode=debug&edition=2018&gist=fee8cfa738ce8b0c929bb265e5efd5aa
2021-06-20 13:56:23 routeveg Here, i'm trying to make a function which takes a std::error::Error, and produces a Result<T, Box<dyn std::error::Error>> from it.
2021-06-20 13:57:02 danieldg routeveg: you need to say E:'static
2021-06-20 13:57:14 routeveg But the borrow checker seems to take issue with it. I'm not sure what the problem is, as I added the trait bound 'Copy', so the 'E' should be able to be passed by value, then moved into the box
2021-06-20 13:57:21 danieldg or change to dyn Error + 'a
2021-06-20 13:58:15 trev and also you forgot to derive Copy
2021-06-20 13:59:15 danieldg routeveg: in particular, the current function allows for a type that contains a reference like &u32, but the returned Box is declared as not having external references (the default for dyn Trait)
2021-06-20 14:02:48 routeveg Perhaps I misunderstand the meaning of 'static, but if I force E to be static, wouldn't that then require anything I pass in to be...well..static?
2021-06-20 14:02:56 danieldg no
2021-06-20 14:03:14 danieldg a type being 'static is different from a reference being static
2021-06-20 14:04:10 danieldg a 'static type just means it contains no references (other that 'static references)
2021-06-20 14:04:11 routeveg Ohhh I see
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2021-06-20 14:09:03 routeveg Thanks! It seems to be appeased now :)
2021-06-20 14:09:21 routeveg I'll do more reading on that, and also the impl trait syntax which I hadn't encountered before
2021-06-20 14:09:56 danieldg note impl Trait and dyn Trait are related but quite distinct
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2021-06-20 14:12:23 Moomoc_ Can I compare to fn() function pointers?
2021-06-20 14:12:40 Moomoc_ I only need equiality
2021-06-20 14:12:45 Moomoc_ * equality
2021-06-20 14:13:22 danieldg yes
2021-06-20 14:14:12 j`ey evalr2: fn foo(){} fn bar(){} fn eq(a: fn(), b: fn()) -> bool { a == b } (eq(foo, foo), eq(foo, bar))
2021-06-20 14:14:15 -- Notice(evalr2): j`ey: (true, false)
2021-06-20 14:15:33 danieldg I guess there might be issues if you have 13 or more arguments to your function
2021-06-20 14:15:49 Moomoc_ Hehe, I will always have one.
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2021-06-20 14:17:27 j`ey impl<Ret, A, B, C, D, E, F, G, H, I, J, K, L> PartialEq<unsafe fn(A, B, C, D, E, F, G, H, I, J, K, L) -> Ret> for unsafe fn(A, B, C, D, E, F, G, H, I, J, K, L) -> Ret
2021-06-20 14:17:31 j`ey lol
2021-06-20 14:17:33 Moomoc_ j`ey: Strange, when I had two functions and compared them and passed this value to println, it didn't compile (tried to compare fn() {a} with fn()`, but writing an eq function as you wrote works.
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2021-06-20 14:18:08 danieldg Moomoc_: you have to cast them to pointers first
2021-06-20 14:18:10 j`ey because of coercions probably
2021-06-20 14:18:25 Moomoc_ aaaah, true
2021-06-20 14:18:32 j`ey evalr2: fn foo(){} fn bar(){} foo == bar
2021-06-20 14:18:34 -- Notice(evalr2): j`ey: error[E0369]: binary operation `==` cannot be applied to type `f ...
2021-06-20 14:18:35 -- Notice(evalr2): j`ey: https://play.rust-lang.org/?version=stable&mode=debug&edition=2018&gist=2a37467012c9fae7326ba98450a4a563
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2021-06-20 14:18:39 danieldg Moomoc_: by default, function names are a zero-sized type that is unique to the function
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2021-06-20 14:19:12 danieldg but you can convert that type to a pointer transparently
2021-06-20 14:19:18 Moomoc_ Ok, makes sense. Thanks to both of you
2021-06-20 14:19:23 Moomoc_ &a?
2021-06-20 14:19:32 danieldg no
2021-06-20 14:19:46 danieldg you'd use 'as' or pass it as an argument
2021-06-20 14:19:54 danieldg or assign it to a typed variable
2021-06-20 14:19:54 Moomoc_ ok
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2021-06-20 14:22:25 Moomoc_ My last problem is that topological sort has a requirement on T: Hash. fn(String) -> String is Hash, fn(&mut String) is not. Is there a work-around for that? Otherwise I will probably need to fork the code.
2021-06-20 14:23:13 danieldg erm, it should be Hash
2021-06-20 14:23:55 Moomoc_ Ok, my not so minimal toy code: https://paste.rs/IKz
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2021-06-20 14:26:06 danieldg evalr2: let mut m = std::collections::HashMap::new(); fn f(&mut String) {} let ff : fn(&mut String) = f; m.insert(ff, 3u32)
2021-06-20 14:26:09 -- Notice(evalr2): danieldg: error: expected one of `:`, `@`, or `|`, found `)` ...
2021-06-20 14:26:10 -- Notice(evalr2): danieldg: https://play.rust-lang.org/?version=stable&mode=debug&edition=2018&gist=ea62fe73f92da30057cdc63bc89e2319
2021-06-20 14:26:26 danieldg evalr2: let mut m = std::collections::HashMap::new(); fn f(_:&mut String) {} let ff : fn(&mut String) = f; m.insert(ff, 3u32)
2021-06-20 14:26:29 -- Notice(evalr2): danieldg: error: implementation of `Eq` is not general enough ...
2021-06-20 14:26:30 -- Notice(evalr2): danieldg: https://play.rust-lang.org/?version=stable&mode=debug&edition=2018&gist=5785c765f51a4285d76ce3abc4a09e69
2021-06-20 14:27:36 danieldg huh, seems like a bug in higher-ranked lifetimes there
2021-06-20 14:27:57 Moomoc_ Err?
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2021-06-20 14:28:56 danieldg well, you can do this with trait objects instead of function pointers
2021-06-20 14:29:12 Moomoc_ Higher rank because it's a pointer to a function? So should it work in theory and I could have found a bug?
2021-06-20 14:29:13 danieldg that might need to be the solution, as annoying as it is
2021-06-20 14:29:19 Moomoc_ Oh no :)
2021-06-20 14:29:28 danieldg it's not really a bug, more a missing feature
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2021-06-20 14:30:34 Moomoc_ I see. I thought I could get away by forking topological_sort and not usie a hashmap, but some type-level container and hence circumvent the necessity on Hash that it claims is the issue.
2021-06-20 14:31:15 danieldg if you look at the error I got, the Eq is also not generic enough
2021-06-20 14:31:28 danieldg so even btreemap will give you the problem
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2021-06-20 14:33:02 danieldg you can get around it using traits, but it's a bunch of dumb boilerplate that shouldn't be needed
2021-06-20 14:33:15 Moomoc_ Well, I thought to have struct List<X,Y>; struct End; List<a, List<b, End>>; where a, b are functions
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2021-06-20 14:37:53 Moomoc_ danieldg: Just for understanding, when I implement something myself, I would get at some point into similar trouble because I cannot compare function pointers with mutable lifetimes, right?
2021-06-20 14:38:39 danieldg yep, this issue is because function pointers with references in the arguments don't "work right"
2021-06-20 14:38:49 danieldg any references, not just mut
2021-06-20 14:39:25 Moomoc_ Alright, thanks
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2021-06-20 14:40:50 danieldg Moomoc_: trait StringMapper { fn map(&self, s : &mut String); } struct PerformWork1; impl StringMapper for PerformWork1 { fn map(&self, s : &mut String) { m.push_str("") }}
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2021-06-20 14:41:54 danieldg then type Fun = &'static dyn StringMapper; static PERFORM_WORK1 : PerformWork1 = PerformWork1; and use &PERFORM_WORK1 in the function calls
2021-06-20 14:43:32 Moomoc_ A reference to a trait object? :)
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2021-06-20 14:43:56 danieldg yep
2021-06-20 14:44:06 Moomoc_ And that'll be hasheable and Eq?
2021-06-20 14:44:24 danieldg oh, you'll need to add those to the trait
2021-06-20 14:44:38 danieldg trait StringMapper : Hash + Eq + 'static { ...
2021-06-20 14:44:58 Moomoc_ mmmmh, would it be derivable?
2021-06-20 14:45:09 danieldg yes, you derive it on PerformWork1
2021-06-20 14:45:28 danieldg ... I think
2021-06-20 14:45:46 danieldg actually I don't know how easy it is to Eq on trait objects
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2021-06-20 14:46:36 danieldg maybe easier solution: forget the trait, wrap the function pointers in a struct
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2021-06-20 14:46:45 danieldg then impl Hash and PartialEq on that struct
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2021-06-20 14:47:31 Moomoc_ Yes, but I am not sure how to implement Eq if I cannot pass it through.
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2021-06-20 14:47:43 danieldg std::ptr::eq
2021-06-20 14:47:43 Moomoc_ Except for casting it to some u64 or alike and comparing
2021-06-20 14:47:52 Moomoc_ hehe, ok.
2021-06-20 14:48:37 Moomoc_ That might actually be the solution, and it seems less painful than the trait object solution, even though I find it a good thing to think through
2021-06-20 14:48:48 danieldg for Hash you probably do need to cast to usize
2021-06-20 14:48:49 Moomoc_ (to think through → trait objects)
2021-06-20 14:50:35 Moomoc_ danieldg: But to recover the usize, I'd need to have unsafe code, right?
2021-06-20 14:50:38 danieldg you wouldn't be able to compare the trait objects until std::ptr::Pointee is stable
2021-06-20 14:50:48 Moomoc_ Recover usize -> fn()
2021-06-20 14:50:48 danieldg no, you can 'as usize' pointers in safe code
2021-06-20 14:51:11 danieldg it's just using raw pointers that is unsafe
2021-06-20 14:51:37 Moomoc_ fn() as usize works for me. Vice versa doesnt and that makes sense.
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2021-06-20 14:53:45 danieldg note I think it's valid for the compiler to use the same address for two identical functions
2021-06-20 14:54:04 danieldg I don't think rust/llvm actually does this (it really hinders debugging)
2021-06-20 14:54:21 danieldg but it's something to keep in mind
2021-06-20 14:54:25 Moomoc_ It would probably boil down to this: https://paste.rs/Kk2
2021-06-20 14:54:50 Moomoc_ What do you mean it is valid? Sure it is, this is the point of function pointers. Or do you mean something else?
2021-06-20 14:55:48 danieldg Moomoc_: if you are ordering function pointers based on some graph and two of the functions you order are identical and go to the same address, they might be equal when you'd expect them unequal
2021-06-20 14:56:16 danieldg or maybe they're unequal in debug mode but equal in release
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2021-06-20 14:56:24 danieldg which is never a fun thing to happen
2021-06-20 14:57:01 Moomoc_ You mean the functions would get the same symbol in the binary, even though from the code they look like different functions?
2021-06-20 14:57:17 Moomoc_ and hence I would expect them to be different, but they're not?
2021-06-20 14:57:23 danieldg well, you can have two symbols point the same address
2021-06-20 14:57:34 Moomoc_ Also true
2021-06-20 14:57:55 Moomoc_ I'll fork that library and implement the algorithm without hash an d eq. You convinced me.
2021-06-20 14:58:04 Moomoc_ * Eq
2021-06-20 14:58:44 Moomoc_ But I really learned an awful lot. Thank you very much
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2021-06-20 15:11:50 Polochon_street hi! I'm writing some doc, and would like to do like [item](Item::something) in a module where `Item` is not imported - how could I do that without the linter screaming that I imported `Item` needlessly?
2021-06-20 15:12:13 danieldg #[cfg(doc)] use
2021-06-20 15:12:31 Polochon_street erf, tried [doc], obviously it didn't work. Thanks
2021-06-20 15:17:36 routeveg It looks like there's some interesting coercion stuff going on around the ? operator here: https://play.rust-lang.org/?version=stable&mode=debug&edition=2018&gist=a64d49f6bb79d591784f3f917aee17d1
2021-06-20 15:18:10 routeveg Specifically, it appears that a String coerces readily to a Box<dyn std::error::Error>, but only when the ? is used
2021-06-20 15:18:19 j`ey routeveg: ? calls .into()
2021-06-20 15:18:25 routeveg (If you try to assign/return it directly as a Result, it doesn't do the thing
2021-06-20 15:18:31 routeveg oo, *checks docs*
2021-06-20 15:20:37 peterandre hi, i have alot of .tis .css and .html files that i want to include in my binary (.exe) i use include_bytes to include index.html But inside the file index.html index.css is loaded. How can i load the index.css when include_bytes is used ?
2021-06-20 15:21:28 Tacklebox You can use build.rs to invoke a bundler to inline your referenced assets so it's all one file for include_bytes to include
2021-06-20 15:21:41 peterandre ah ok
2021-06-20 15:22:08 peterandre thanks
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2021-06-20 15:38:07 db48x another common thing to do is to create a zip file of all of your assets, then decompress it into memory at run time
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2021-06-20 15:39:07 peterandre ok cool. do you have some example ?
2021-06-20 15:39:13 peterandre or short guide
2021-06-20 15:39:17 db48x if you avoid using compression when creating the zip file, then there is no need for extra copies when you read individual files
2021-06-20 15:40:49 db48x peterandre, Firefox is a good example
2021-06-20 15:41:07 db48x look for the file called “omni.ja”
2021-06-20 15:42:59 peterandre ok
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2021-06-20 16:20:13 routeveg I made a thing https://play.rust-lang.org/?version=stable&mode=debug&edition=2018&gist=c1596315debf0127af8b1b392d50cd23
2021-06-20 16:20:17 routeveg This 'check' function
2021-06-20 16:20:33 routeveg Seems like this is a pattern - is there something in std:: for this behavior?
2021-06-20 16:20:48 routeveg (to use with the ? operator to convert assertions into Err)
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2021-06-20 16:42:18 Arnavion Nothing built-in. You can make a fn like you did, or abuse cond.then(|| ()).ok_or("check failed")?; , or some error crates like anyhow have an ensure! macro
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2021-06-20 17:27:41 Polochon_street hmm, I'm trying to pass around `FnOnce`s, but when putting them in traits and iterating with them (like this simple example https://play.rust-lang.org/?version=stable&mode=debug&edition=2018&gist=1fccb19b4412f42ac28e609370b313c1), it doesn't compile, would anyone have any idea as to why?
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2021-06-20 17:28:43 danieldg Polochon_street: you're using the function more than once
2021-06-20 17:29:25 danieldg sort_by_cached_key calls its closure multiple times
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2021-06-20 17:30:26 Polochon_street yep, but how is that a problem?
2021-06-20 17:31:01 danieldg it's a move
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2021-06-20 17:35:50 Polochon_street solved it like this https://play.rust-lang.org/?version=stable&mode=debug&edition=2018&gist=558da8729bfd8f5f05f7bed380275669, by replacing FnOnce par Fn, and using an explicit closure, not sure how nice it is
2021-06-20 17:37:15 danieldg the explicit closure isn't really needed
2021-06-20 17:38:06 Polochon_street but it doesn't really compile without it :P
2021-06-20 17:38:12 danieldg you could use FnMut, you don't have to go down all the way to Fn
2021-06-20 17:39:11 danieldg oh, just pass &function
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2021-06-20 17:40:51 Polochon_street isn't `use_function` expecting an actual F, not &F ?
2021-06-20 17:41:21 danieldg there's an impl Fn for &T
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2021-06-20 17:42:35 Polochon_street hm, the compiler complains about ``Fn<(u32,)>` closure, found `F``. My knowledge about Fn/FnOnce/FnMut is super rusty though, so that's on me. I guess a rustbook refresher should be good enough to help me solve this right?
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2021-06-20 17:47:09 routeveg Arnavion: Ah understood. Thanks :)
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2021-06-20 17:52:03 yourfate so, as a pet project I wanna build yet another time tracking software, which outputs the data in reports that I can copy/paste into the forms at work. Now I'm thinking of how to store the data. a: directory struction, folder per year, each day is a .toml file with serialized structs inside
2021-06-20 17:52:14 yourfate b: use a database (which I have no clue about but kinda would like to learn
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2021-06-20 17:53:31 danieldg database like sqlite is probably the best
2021-06-20 17:53:50 danieldg ad-hoc filesyste-based databases are actually harder to use imo
2021-06-20 17:54:31 danieldg but then I've actually used databases before, there is a learning curve
2021-06-20 17:54:35 yourfate ok, so sqlite is kinda boring, which cool technology db do I use? prostgresql or redis? :D
2021-06-20 17:54:39 dav1d I prefer the file based approach, work in memory, persist to FS
2021-06-20 17:55:06 dav1d postgres will be like sqlite (just with a server), redis isnt really made for persistance, but could be configured for it
2021-06-20 17:55:17 yourfate ah
2021-06-20 17:55:28 danieldg yeah, dealing with a server is likely overkill for this
2021-06-20 17:55:41 yourfate rn I use emacs org mode for this
2021-06-20 17:55:55 yourfate but I don't speak elisp and don't really ahve too much interest to learn it
2021-06-20 17:56:05 yourfate was I'd need to build the reporting tool in that
2021-06-20 17:56:14 yourfate *as
2021-06-20 17:56:19 danieldg learning sql is likely useful to you
2021-06-20 17:56:24 yourfate maby
2021-06-20 17:56:26 danieldg at least simple sql
2021-06-20 17:56:37 yourfate tho i'm an electrical engineer
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2021-06-20 17:59:55 dav1d yourfate, Never got around to try it, but this might be interesting for you: https://docs.rs/sled/0.34.6/sled/
2021-06-20 18:00:36 dav1d There are also probably a few implementations similar to https://docs.python.org/3/library/shelve.html
2021-06-20 18:02:13 yourfate there are many words I don't know in the readme :D
2021-06-20 18:02:15 yourfate looks interesting
2021-06-20 18:02:53 dav1d tbh probably overkill and/or not suited, but could be something to experiment with
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2021-06-20 18:04:09 yourfate but i'd have to think how to structure my data for that
2021-06-20 18:04:37 yourfate for files I'd probably just do a clock event struct, with timestamp, and a type enum, for clock start / pause start / pause end / clock end
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2021-06-20 18:05:03 yourfate each day can have arbitrary pairs of those
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2021-06-20 19:35:10 rtyler I'm hoping somebody can help me with a pattern that seems to elude me right now: I basically need a runloop wherein I give a function sessionA, and it returns to me sessionA1, on the next iteration of the loop the function should be given sessionA1 and be returned sessionA2, etc, etc. Of course my naive implementation fails because the value is moved in previous iterations of the loop
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2021-06-20 19:36:52 danieldg rtyler: just give the function &mut session?
2021-06-20 19:37:16 danieldg rtyler: you can also do this with moves, though
2021-06-20 19:37:31 danieldg i.e. the naive implementation should work
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2021-06-20 19:41:23 rtyler perhaps my naive implementation is different than yours :P
2021-06-20 19:41:38 danieldg make one on the playground
2021-06-20 19:41:44 rtyler let mut session = foo(); loop { let session = consume(session); }
2021-06-20 19:41:57 danieldg drop the let
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2021-06-20 19:42:23 rtyler huh, I knew it'd be something silly, thanks again danieldg :P
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2021-06-21 00:05:29 rk4 another 3-4 weeks before programming rust 2nd edition arrives :<
2021-06-21 00:06:09 rk4 thinking i'll work through it then see what rust jobs are floating about
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2021-06-21 03:03:58 Geekingfrog Uhm, when I run `cargo build --release` and immediately follow with `cargo install --path .` is still builds a lot of stuff. I would have thought that install was simply a copy of the released binary? What is cargo doing?
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2021-06-21 03:14:55 jbg afaik cargo install always builds with a temporary target dir
2021-06-21 03:15:20 jbg it's not really like `make install`
2021-06-21 03:16:49 jbg if you want it to reuse your development target dir you can probably set CARGO_TARGET_DIR explicitly
2021-06-21 03:18:29 jbg also, `cargo install` ignores `Cargo.lock` by default, which would also cause some stuff to be built if you haven't run `cargo update` recently. you can use `cargo install --locked` to make it use the (potentially older) dependencies locked in `Cargo.lock`
2021-06-21 03:19:23 saati do you know why?
2021-06-21 03:20:06 saati i mean what was the rationale for those two decisions
2021-06-21 03:21:12 jbg `cargo install` is not like `make install`. the purpose of `cargo install` is for things like `cargo install ripgrep`
2021-06-21 03:21:40 jbg and it makes good sense for that to use the latest compatible dependencies and to use a temporary target dir
2021-06-21 03:22:23 jbg then in that context you can see `cargo install --path` as being basically a tool for testing out your local in-development crate with `cargo install`, so it makes sense for it to work the same way
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2021-06-21 03:29:54 Geekingfrog Ok, makes sense
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2021-06-21 03:46:18 Moomoc_ I want to match a type in a macro, but cannot use the binding multiple times, e.g. ($arg:ty foo bar $arg). Is there a work-around?
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2021-06-21 05:26:36 Moomoc such rust topological_sort add_dependency
2021-06-21 05:26:42 Moomoc oops, sorry
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2021-06-21 06:04:49 tomboy64 how can i prepend a single number to an iterator? e.g. (1).iter().chain(some.iter())?
2021-06-21 06:05:04 Mutabah std::iter::once(1)`
2021-06-21 06:06:09 tomboy64 !
2021-06-21 06:06:11 tomboy64 thanks
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2021-06-21 06:19:37 dav1d I have a problem with futures, I have this code: `futures::future::try_join_all(flows.map(|rs| publisher.publish(&rs))).await`, flows is just an iterator. The problem is `cannot return value referencing function parameter `rs`` because the returned future of `publish()` has the reference to rs, how can I fix this?
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2021-06-21 06:35:50 saati can someone give me a quick rundown of the differences between quinn, quiche and neqo (and any other quic libs)?
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2021-06-21 06:41:40 jbg dav1d: it's not really possible to answer that in the abstract, it depends on what `rs` is, what `publish()` is doing with it, etc
2021-06-21 06:42:06 dav1d jbg, gimmy a sec, I'll put it into a playground then
2021-06-21 06:47:34 dav1d jbg: https://play.rust-lang.org/?version=stable&mode=debug&edition=2018&gist=e63a25c841ac08b01ea187fc9d9ce1d3
2021-06-21 06:48:45 jbg ah yeah, now I understand it better
2021-06-21 06:49:11 jbg I assume in your real code there is some reason you can't just take Flow instead of &Flow?
2021-06-21 06:49:38 jbg you're throwing away the Flow objects in your iterator anyway, so there's no need in your example to pass it by reference
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2021-06-21 06:51:36 jbg (which is basically the source of the error; the Flow is dropped at the end of the body of the map() but the Future still holds a reference to it)
2021-06-21 06:52:54 jbg if you need the trait method to take &Flow for whatever reason, you could have your iterator iterate over some external storage of Flows and have the iterator item type be &Flow
2021-06-21 06:53:19 jbg then you only have to make sure the storage of Flows lasts at least as long as the futures do, which should be easy to arrange
2021-06-21 06:58:03 bihtori dav1d: Possible solution using Arc: https://play.rust-lang.org/?version=stable&mode=debug&edition=2018&gist=28f5d20955af604a88b7e859a4101772
2021-06-21 07:00:40 jbg yeah, I was going to suggest Arc too, but it doesn't add anything beyond moving the Flow in the example as given. could be the best solution in the real code though
2021-06-21 07:00:41 dav1d jbg, I had it take Flow for a while, but the moment I have multiple publishers, I need to clone the Flow, which I want to avoid
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2021-06-21 07:00:49 jbg ah, sounds like Arc is ideal in that case
2021-06-21 07:01:28 jbg if you don't have external (to the futures) storage of the Flow objects, then you need the futures to own them. if you need more than one future to own one Flow, then that's exactly what Rc/Arc are for
2021-06-21 07:02:24 bihtori jbg: yep overusing Arc sometimes does may smell like an anti-pattern, but it depends. In many cases .(move |stuff|) helps alot but not here.
2021-06-21 07:03:27 dav1d thanks!
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2021-06-21 07:04:18 jbg if one Flow goes to one future, simply removing & from the method call and the method definition in trait/impl is sufficient though.
2021-06-21 07:05:20 dav1d yeah, I was moving from taking ownership back to a reference, but sounds like I have to think about more what I really need
2021-06-21 07:05:37 dav1d *more about
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2021-06-21 07:49:47 davros anyone used rust with wasm here?
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2021-06-21 07:53:04 davros (ive just downloaded some 'rust-wasm' example from github, i see it compiles & runs in a desktop window , wasn't quite expecting that, is that likely just a desktop build of the same code, or is it running wasm through some stub?
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2021-06-21 07:56:28 j`ey how did you build it?
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2021-06-21 07:56:53 j`ey could be either
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2021-06-21 08:06:11 davros hmm the example gives "a makefile to build for the web", i just did 'cargo run' . nevermind, not important
2021-06-21 08:06:33 j`ey link the repo!
2021-06-21 08:06:43 davros yeah i was just about to
2021-06-21 08:07:00 davros https://github.com/gliheng/rust-wasm
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2021-06-21 08:07:10 j`ey so which example did you run?
2021-06-21 08:07:26 davros sdl2-simple
2021-06-21 08:07:45 davros i see another more minimal guide in rust documentation
2021-06-21 08:08:13 davros https://developer.mozilla.org/en-US/docs/WebAssembly/Rust_to_wasm <<i guess i should try this..
2021-06-21 08:08:13 j`ey ok yeah, that ran a native version
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2021-06-21 08:08:50 davros that is certainly something i need to do (run the same program completely native or in a browser)
2021-06-21 08:09:57 j`ey https://github.com/gliheng/rust-wasm/blob/master/sdl2-simple/src/main.rs#L84
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2021-06-21 08:44:57 tomboy64 is there an optimized function available that lets me vec.append() from an iterator?
2021-06-21 08:45:30 tomboy64 append only works with Vec. and i'm looking for something besides a for loop
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2021-06-21 08:46:21 tomboy64 hmmm resize_with() perhaps
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2021-06-21 08:57:36 danieldg tomboy64: extend
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2021-06-21 09:01:25 tomboy64 thanks
2021-06-21 09:01:54 discipulus davros: have you already done the tutorial in the Rust wasm book? https://rustwasm.github.io/docs/book/
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2021-06-21 09:03:24 discipulus I noticed the Rust and WebAssembly working group is defunt now
2021-06-21 09:08:55 discipulus I have interest in rust wasm myself. I plan to learn more about non-browser applications in the future.
2021-06-21 09:09:48 la_mettrie i'm trying to get basic file operations to work so that I could grasp errors. but it seems it's difficult to get a code like this to compe (this totally doesn't work): https://pastebin.com/raw/UeUSuFns
2021-06-21 09:09:59 la_mettrie *to compile
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2021-06-21 09:18:18 lambda la_mettrie: you can't assign your error to `filevar`, because it's of type `std::fs::File`
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2021-06-21 09:27:10 la_mettrie yes, i know i can't do many things. more difficult it is to know how i can do it so that it works
2021-06-21 09:28:10 kee la_mettrie: What are you trying to do?
2021-06-21 09:28:21 kee As in, what's the intention of that code?
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2021-06-21 09:36:29 la_mettrie kee: to open a file but also get that potential error message so that it can be shown to the user ...if it fails, is it because of permissions or file_not_found or something else
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2021-06-21 09:39:56 lambda la_mettrie: what do you want to happen when an error occurs? the function obviously can't continue and read from the file, because there is no file
2021-06-21 09:40:57 la_mettrie lambda: to get the type of the error (file not found or no permissions or something else) to be known so that i can tell it to the user
2021-06-21 09:41:05 kee la_mettrie: Try this. (You'll have to display the message in a caller, because this function isn't `restore_image_and_show_pretty_error`.)
2021-06-21 09:41:19 kee Actually, wait a minute, it didn't compile.
2021-06-21 09:42:50 kee la_mettrie: https://play.rust-lang.org/?version=stable&mode=debug&edition=2018&gist=23eaa5c399b284554cea220075f86d6e
2021-06-21 09:43:01 kee Raw: https://gist.githubusercontent.com/rust-play/23eaa5c399b284554cea220075f86d6e/raw/842ffc4916359bbb43b1d9dc0868ffc6644f897d/playground.rs
2021-06-21 09:44:25 kee Feel free to just .unwrap() the result of calling `restore_image`. Example:
2021-06-21 09:45:12 kee la_mettrie: Actually, you've left some errors unhandled that I didn't notice.
2021-06-21 09:46:49 kee What you should do is return Result<whatever, std::io::Error> from your function.
2021-06-21 09:47:12 kee Have *all* the displaying code outside that function, at the last possible point where you can't recover from the error.
2021-06-21 09:48:13 la_mettrie okay, thanks a lot. it seems i quite don't see why every function should return something
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2021-06-21 10:01:32 lambda la_mettrie: because that's the way to communicate information back to the calling function - if you have nothing to return, then so be it, but in this case you want to inform the caller that the function failed
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2021-06-21 10:05:12 la_mettrie yeah, that's elementary, but i just thought that there's something in rust's error handling that makes returning compulsory at times and there might be something i've not grasped
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2021-06-21 10:06:41 la_mettrie my intuition is that if i follow those textbook examples of how to do things, i'd end up using shorter functions since many in-built functions seem to be build around the idea that they return something and it may be difficult to use many such calls in one bigger function
2021-06-21 10:06:58 la_mettrie *to be built
2021-06-21 10:11:14 ioxzev1z Why did rust choose to return the value of the last expression, rather than having an explicit return statement?
2021-06-21 10:11:27 elichai2 Hi, I'm using `for_each` on an async stream, how can I stop the iteration when some bool changes to true? (a shutdown handler)
2021-06-21 10:11:28 ioxzev1z return foo; reads easier than just foo on its own
2021-06-21 10:11:32 elichai2 I'm using: https://docs.rs/futures/0.3.15/futures/prelude/stream/trait.StreamExt.html#method.for_each
2021-06-21 10:14:14 elichai2 should I return something instead of `future::ready(())`? maybe `ready::maybe_done()`? not sure what is it exactly
2021-06-21 10:14:57 elichai2 or maybe I should use take_until ?
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2021-06-21 10:16:08 lambda ioxzev1z: because that would require special-casing functions from other blocks where it might make more sense
2021-06-21 10:18:18 lambda and usually you don't have `foo` on its own as the last expression but something more complicated, which makes it look more like a tail call
2021-06-21 10:21:14 lambda la_mettrie: generally, many smaller functions that all do only one "thing" tends to make for cleaner code
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2021-06-21 10:31:21 kee la_mettrie: In-built functions are built around the idea that they return something because it's easier to reason about returning.
2021-06-21 10:31:37 kee For the compiler, and for me (which I generalise to everybody).
2021-06-21 10:32:12 kee You could mutate state everywhere, and Rust could provide a standard library geared for mutated state, but it wouldn't be as useful.
2021-06-21 10:32:28 kee Every mutable object has a different interface, for one.
2021-06-21 10:32:42 kee If you had but one interface, you've just re-invented returning, with extra steps.
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2021-06-21 10:50:02 cehteh how can i figure out what profile was used when building for conditional compilation? is debug_assertions the only flag available?
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2021-06-21 11:27:57 Arnavion cehteh: There's no way. cfg(debug_assertions) works as an approximation, but note that the user can enable debug assertions even for release
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2021-06-21 11:36:22 [code] Arnavion, cehteh what about using a build script and looking at env("PROFILE") and setting a cfg flag?
2021-06-21 11:36:26 cehteh Arnavion: yes i know that, thats why i asked if there is some more direct access to the actual profile used
2021-06-21 11:37:39 cehteh dont want to use a build script here, its a lib for testing, just adds a bit more complication
2021-06-21 11:37:42 Arnavion cehteh: Profiles are out of your control. It's always been the long term plan that the root can define arbitrary new ones. So don't match on the name, match on the specific feature like debug_assertions that you care about
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2021-06-21 11:38:59 cehteh Arnavion: my lib calls 'cargo build' thus i wanted to pass through what the originator passed
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2021-06-21 11:39:23 cehteh using debug_assertions now as approximation, good enough but not perfect
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2021-06-21 11:40:20 [code] your lib shouldn't be calling cargo build. you should use a build script for that if you need it or use workspaces
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2021-06-21 11:40:58 cehteh in thus case its just the right thing i believe ... https://crates.io/crates/bintest
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2021-06-21 13:16:35 routeveg Hi all; can I have a sanity check around lifetime coercion?
2021-06-21 13:17:39 routeveg When a function is called, if a mutable reference is involved, the resulting borrow lifetime cannot be coerced to end before the lifetime of the thing being referenced.
2021-06-21 13:18:09 routeveg And this affects all other things which are borrowed by the function, mutable and otherwise
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2021-06-21 13:18:29 routeveg I guess, specifically what I want confirmation on, is that coercion is affected by mutability of borrowed things.
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2021-06-21 13:53:22 Polochon_street hi! I'm trying to do "trait alias" ("name" a closure type) here https://play.rust-lang.org/?version=stable&mode=debug&edition=2018&gist=0bf0a2a03b92b8f53cbd8935d640e7cd, but for some reason, it says that the closure I pass to the function doesn't implement my trait
2021-06-21 13:53:47 Polochon_street it makes somehow sense, but I'm wondering if there's a way to make it automagically associate my trait and closures of the same type?
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2021-06-21 14:01:05 kron Polochon_street: impl<F> DistanceMetric for F where F: FnOnce(u32, u32) -> u32 {}
2021-06-21 14:01:20 Polochon_street ahh, right. I needed to impl it correctly
2021-06-21 14:01:27 Polochon_street thanks a lot, it works :D
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2021-06-21 15:24:19 -- Mode ##rust [-o mrmonday] by mrmonday
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2021-06-21 15:27:29 mrmonday jbg: I spotted that you set +r, I've set up a forward channel to catch unidentified users to hopefully point them in the right direction
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2021-06-21 15:40:07 twiclo https://p.twil.cx/duk.rs
2021-06-21 15:40:09 twiclo I'm just now getting into proper error handling with my project. I'm not sure what the compiler is wanting me to do with implementing this
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2021-06-21 15:41:16 GreenJello twiclo, there aren't any other warnings?
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2021-06-21 15:43:16 twiclo No sire
2021-06-21 15:43:19 twiclo *sir
2021-06-21 15:43:23 twiclo I don't respect you that much
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2021-06-21 15:44:07 GreenJello :-p
2021-06-21 15:44:29 mrmonday jbg: also next time, /invite ozone to clear up the spammers if you're there soon enough
2021-06-21 15:44:37 twiclo There is one other warning that I'm not using the bom function yet. I didn't think it's relevant but it could be
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2021-06-21 15:44:52 GreenJello twiclo, yep, that's what I was asking about
2021-06-21 15:45:03 GreenJello if bom is unused, then Generic is also unused
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2021-06-21 15:45:32 GreenJello I don't get why the compiler warns about both, but it does
2021-06-21 15:45:35 twiclo Alright I'll use it and see what happens
2021-06-21 15:46:19 Hans-Martin I'd wager a bet that the warning goes away :-)
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2021-06-21 16:02:33 twiclo https://p.twil.cx/lib.rs
2021-06-21 16:02:55 twiclo The first two functions are async and my HttpServer::new() can handle that but when I try it with bom it fails
2021-06-21 16:03:20 twiclo https://p.twil.cx/qof.rs
2021-06-21 16:03:22 twiclo Better version
2021-06-21 16:04:04 twiclo I do know that I need to wrap the response from bom in an HttpResponse but that shouldn't be giving me an async error right?
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2021-06-21 16:11:39 GreenJello you have to define it like the other routes
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2021-06-21 16:12:36 GreenJello the arguments are also wrong
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2021-06-21 16:14:43 GreenJello and yes, if even only the return type is invalid you'll get an error like this
2021-06-21 16:15:07 GreenJello iirc the return type can be anything that impls Responder
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2021-06-21 16:24:09 SoF hey, is there a way to recover from a stack overflow?
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2021-06-21 16:25:43 twiclo IRC is a good start
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2021-06-21 16:27:10 SoF ah - panic::catch_unwind works here too
2021-06-21 16:27:23 SoF wait
2021-06-21 16:28:15 Hans-Martin I'm trying to wrap my head around libp2p. Head's already pretty warped... I'm trying to copy&paster parts of the chat example and get this error: https://hastebin.com/anemivager.rs
2021-06-21 16:28:59 Hans-Martin Rust claims that `event` is of type ()
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2021-06-21 16:31:03 rglu SoF: Rather than jumping through hoops to preserve a recursive solution, have you considered an iterative one?
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2021-06-21 17:41:48 georgemp is it possible for me to set the crate type for a lib (depending on the architecture) - on some archs build staticlib and cdylib, and on some other only staticlib?
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2021-06-21 18:09:22 Arnavion No. If you need that, make separate manifest files
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2021-06-21 18:13:43 georgemp ah ok..thanks
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2021-06-21 19:58:28 w0x12ef https://github.com/tokio-rs/tokio
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2021-06-21 21:44:42 meltyness i need the rust compiler to look over my math homework :(
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2021-06-21 21:51:08 ChaiTRex meltyness: If the words aren't spilling off the page, that's a lot of avoided memory errors right there.
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2021-06-21 21:52:35 meltyness error[E0000]: integrals getty biggy, derivatives shrinky dinky
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2021-06-21 22:05:55 w0x12ef what is this use case #[async_triat]
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2021-06-21 22:14:10 meltyness my Result has 3 arms :{
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2021-06-21 22:14:17 meltyness https://play.rust-lang.org/?version=stable&mode=debug&edition=2018&gist=87d4b314ac5266c0eb08d0839d9d540f
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2021-06-21 22:16:37 SiegeLord What's the utility of having `mod tests`?
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2021-06-21 22:18:04 meltyness in case this extremely critical application is discovered having been broken by i32's PartialOrd implementation
2021-06-21 22:18:10 ChaiTRex SiegeLord: It makes it easy to avoid compiling them when not testing.
2021-06-21 22:18:47 SiegeLord I would have thought #[test] are implicitly #[cfg(test)]
2021-06-21 22:18:56 danieldg it's more useful when tests use helper functions
2021-06-21 22:19:25 danieldg or if you have thigns that are 'use'd only in tests
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2021-06-21 22:22:52 meltyness https://doc.rust-lang.org/book/ch11-03-test-organization.html#the-tests-module-and-cfgtest
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2021-06-21 22:23:32 meltyness SiegeLord "The #[cfg(test)] annotation on the tests module tells Rust to compile and run the test code only when you run cargo test, not when you run cargo build. This saves compile time when you only want to build the library and saves space in the resulting compiled artifact because the tests are not included."
2021-06-21 22:24:17 danieldg I doubt the 'saves space' part is accurate
2021-06-21 22:24:42 meltyness One man's > is another mans >>
2021-06-21 22:25:38 rk4 say no to excessive operator overloading^
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2021-06-21 22:26:27 danieldg I wonder if I could make a program where adding #[cfg(test)] to a module made the binary larger
2021-06-21 22:28:18 danieldg probably could do it by pushing llvm to uninline something by calling it
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2021-06-21 22:28:56 meltyness the preprocessor is turing-complete? yikes.
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2021-06-21 22:30:13 danieldg that's kinda common for preprocessors
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2021-06-21 22:31:25 meltyness if there's one way to thwart static analysis, it seems like it would be that
2021-06-21 22:31:52 danieldg eh, you just expand the macros before doing the analysis
2021-06-21 22:31:53 Tacklebo1 Coming from something like M4, the rust preprocessing/macro situation is very nice.
2021-06-21 22:32:21 danieldg macro expansion is the easiest part of static analysis
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2021-06-21 22:44:45 routeveg Had a weird discussion on #FreeBSD earlier; someone was talking about lua being good for something because it's easily embeddable, someone else was talking about rust.
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2021-06-21 22:45:04 routeveg What does it mean, meaningfully, for a language to be easily embeddable
2021-06-21 22:45:33 routeveg I guess my mind immediately goes to FFIs that let you call and be called by external things, but loads of languages have such FFIs
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2021-06-21 22:46:02 routeveg So, how could rust be made 'more embeddable'?
2021-06-21 22:46:03 danieldg easy ffi, small or nonexistant runtime
2021-06-21 22:46:37 danieldg no_std rust is pretty good; things like std::env are not
2021-06-21 22:46:55 routeveg Is having the ability to interact/introspect with the compiler/runtime/interpreter parts, perhaps important?
2021-06-21 22:47:20 danieldg I'd consider that more 'scriptable' than 'embeddable'
2021-06-21 22:47:30 routeveg Mhmm. hmmmm
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2021-06-21 22:49:47 routeveg So rust + some kind of continuationy/longjmpy thing = scriptable rust, perhaps!
2021-06-21 22:50:34 danieldg I'd just compile things to dylib and use the dynamic linker if I were scripting rust
2021-06-21 22:50:53 danieldg dlopen/dlsym are useful
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2021-06-21 22:51:57 routeveg But how about some kind of thoroughly awful way of doing instruction-level stepping.
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2021-06-21 22:52:18 routeveg (in process, without using ptrace etc...)
2021-06-21 22:52:31 danieldg I have no idea why you would want to do that
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2021-06-21 22:53:05 danieldg maybe make every function async and put an await after each statement :D
2021-06-21 22:53:08 routeveg danieldg: So you can make an API to help you manipulate the rust runtime, much as you would the lua one
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2021-06-21 22:53:22 routeveg Lke, step until something is true, or a function returns, etc..
2021-06-21 22:53:32 routeveg heh, yeah that would do it
2021-06-21 22:54:22 routeveg Could also use an instruction decoder to figure out where the program counter would go after each instruction, then replace that code with an int3/ud2 or something
2021-06-21 22:54:48 routeveg So you'd just get a signal on each instruction, which you could have a handler for.
2021-06-21 22:55:19 danieldg you'll be fighting the optimizer
2021-06-21 22:55:51 danieldg lots of statements have no instruction, and lots of statements have many instructions
2021-06-21 22:56:00 routeveg Mhm; if you built with debug info you could figure out where line numbers are etc...
2021-06-21 22:56:37 routeveg so you could be like : cpu.step_line();
2021-06-21 22:56:50 routeveg cpu.get_current_file_and_line()
2021-06-21 22:56:52 danieldg yes, there are programs that do this already. For example, gdb
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2021-06-21 22:57:23 routeveg But GDB is out of process, so you can use ptrace - i mean you could do it in process by modifying code.
2021-06-21 22:57:41 routeveg I...don't think you can ptrace yourself in Linux.
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2021-06-21 22:58:07 danieldg I think you might be able to ptrace one of your threads
2021-06-21 22:58:20 routeveg oh? Hmmmmm
2021-06-21 22:58:30 routeveg It does seem like you should be able to, doesn't it
2021-06-21 22:58:42 routeveg I feel like I tried it once and something didn't work. But am not sure.
2021-06-21 22:59:37 routeveg Maybe it was something else. Like, there was a problem reading /proc/self/mem
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2021-06-22 00:25:50 rk4 don't suppose anyone's accelerated operations on parquet files in python applications through the use of rust, i notice apache/arrow-rs is a thing, add in pyo3 it ought to be viable
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2021-06-22 01:10:17 w0x12ef does Vec::new() return a reference
2021-06-22 01:10:29 rk4 lets answer a different question
2021-06-22 01:10:39 rk4 lets explore the docs!
2021-06-22 01:11:24 rk4 https://doc.rust-lang.org/std/vec/struct.Vec.html#method.new what do you think of that function signature
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2021-06-22 01:25:53 w0x12ef what do you mean by signature ?
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2021-06-22 01:29:24 rk4 "pub const fn new() -> Vec<T, Global>" would be the function signature
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2021-06-22 01:35:17 rk4 it tells you what type the function returns, and thus if it returns a reference or not. it would be a little odd for new() to return a reference, but that's a seperate thing to learn, in the meantime...reading the docs is a skill that's worth practicing :)
2021-06-22 01:36:16 saati w0x12ef: you get an owned vec
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2021-06-22 01:38:18 w0x12ef saati, is this named RAII?
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2021-06-22 01:41:42 rk4 https://doc.rust-lang.org/stable/book/ch04-01-what-is-ownership.html?highlight=raii#memory-and-allocation can answer that
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2021-06-22 01:42:42 rk4 [it talks in terms of Strings, but a String is just a Vec with some additional details]
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2021-06-22 01:44:09 saati w0x12ef: it could be considered part of it?
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2021-06-22 01:44:40 bihtori Doesn't String have those "small string optimizations" that are and will not be part of Vec?
2021-06-22 01:44:55 saati https://doc.rust-lang.org/src/alloc/string.rs.html#279-281
2021-06-22 01:44:58 bihtori Or was that some other language...
2021-06-22 01:45:01 saati no, it's literally a vec
2021-06-22 01:45:35 w0x12ef rk4:so I must not return reference of variable,which is owned by the function
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2021-06-22 01:46:50 w0x12ef In C++, this pattern of deallocating resources at the end of an item’s lifetime is sometimes called Resource Acquisition Is Initialization (RAII)
2021-06-22 01:46:59 saati bihtori: there are various small string optimization crates
2021-06-22 01:47:03 w0x12ef Sorry ,I cannot understand this
2021-06-22 01:47:05 w0x12ef In C++, this pattern of deallocating resources at the end of an item’s lifetime is sometimes called Resource Acquisition Is Initialization (RAII)
2021-06-22 01:47:24 saati do you know some C?
2021-06-22 01:47:30 w0x12ef yeah
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2021-06-22 01:48:23 saati ok so in C you generally malloc() and get some total garbage data you have to handle yourself, then when you are done with it you need to manually free() it
2021-06-22 01:48:32 rk4 https://doc.rust-lang.org/stable/book/ch04-02-references-and-borrowing.html#dangling-references answers your question about returning a reference to something that the function owns
2021-06-22 01:49:03 w0x12ef rk4, dangling reference is unsafe ?
2021-06-22 01:49:12 saati this is usually not needed in C++ or rust because the objects/values you own (on your stack pretty much) automatically call their destructor/drop
2021-06-22 01:49:25 saati when they go out of scope
2021-06-22 01:49:36 w0x12ef saati, c++ ? do you mean the smart pointer
2021-06-22 01:49:56 w0x12ef oh, i know , you mean the deconstructor
2021-06-22 01:50:56 w0x12ef but we are talking about deallocation ,what the matter with the initialization(RAII)
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2021-06-22 01:51:54 rk4 rust is generally all safe, unless you start using the `unsafe` keyword
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2021-06-22 01:52:13 saati if you automatically deallocate you must make sure you don't have dangling pointers, in rust you can't make dangling pointers without unsafe
2021-06-22 01:53:22 w0x12ef Does RAII mean I can create object without new it on the heap?
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2021-06-22 01:53:26 saati so raii is a misleading name in rust a bit, the initialization part is more important in C++ where you can easily make invalid pointers
2021-06-22 01:53:46 w0x12ef puzzled
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2021-06-22 01:55:05 rk4 i think you should just read the book ;P, it's not very long
2021-06-22 01:55:31 rk4 you'll have lots of questions after that, but the rust 101 stuff will be much more cleared up
2021-06-22 01:55:39 saati w0x12ef: are you talking about c++ or rust?
2021-06-22 01:56:33 saati in c++ it's a design pattern, which means you should make well behaved objects that properly delete whatever they got with new and still own
2021-06-22 01:56:53 saati in rust new is just a convention for a function name
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2021-06-22 02:00:12 w0x12ef_ does rust have the new keyword
2021-06-22 02:00:22 w0x12ef_ like c++ new
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2021-06-22 02:02:59 rk4 https://doc.rust-lang.org/stable/book/appendix-01-keywords.html
2021-06-22 02:03:03 Sobek New is not a keyword in rust
2021-06-22 02:03:14 Shell w0x12ef_: no. (also you shouldn't use new in C++ these days either.) to allocate stuff on the heap, you'd use the Box type.
2021-06-22 02:03:32 w0x12ef_ that's safe ,yes
2021-06-22 02:03:56 w0x12ef_ Does c++ learn from rust
2021-06-22 02:04:02 w0x12ef_ snover, cool
2021-06-22 02:04:10 w0x12ef_ Sobek, ^
2021-06-22 02:04:14 w0x12ef_ oops
2021-06-22 02:05:17 w0x12ef_ RAII and pointers are talking about different things ,
2021-06-22 02:06:05 w0x12ef_ RAII is related with lifetime
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2021-06-22 02:24:15 discipulus TRPL book doesn't really go into allocators, right?
2021-06-22 02:24:41 bertptrs no, allocators are a it of a niche feature and partially unstable
2021-06-22 02:24:49 bertptrs *bit
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2021-06-22 02:33:25 discipulus I see. I now noticed there is a Vec::new_in(alloc: A) and it's a nightly experimental feature.
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2021-06-22 02:33:54 w0x12ef #[unstable(feature = "allocator_api", issue = "32838")]
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2021-06-22 02:39:59 w0x12ef https://play.rust-lang.org/?version=stable&mode=debug&edition=2018&gist=2bd86e03b7b4801f122fc4e67509916a
2021-06-22 02:40:24 w0x12ef one question
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2021-06-22 03:17:27 w0x12ef https://play.rust-lang.org/?version=stable&mode=debug&edition=2018&gist=2bd86e03b7b4801f122fc4e67509916a
2021-06-22 03:17:34 w0x12ef help with this
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2021-06-22 03:21:52 osa1 w0x12ef: what is the question?
2021-06-22 03:22:23 w0x12ef why version 1 does not work
2021-06-22 03:23:16 osa1 paste the full code so that we can easily see what's wrong
2021-06-22 03:23:23 w0x12ef why version 2 work after adding a for loop
2021-06-22 03:23:46 w0x12ef the key is the for loop
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2021-06-22 03:24:21 w0x12ef verion 1 report the list_2 has no enough lifetime
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2021-06-22 03:26:24 bertptrs You've got to post a bit more context, this just doesn't work because of undefined variables
2021-06-22 03:27:10 jeho i need to get myself a rust job
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2021-06-22 03:27:44 bertptrs don't we all
2021-06-22 03:27:44 rk4 jeho: +1
2021-06-22 03:27:50 bertptrs (well some of us have one)
2021-06-22 03:27:59 jeho must be nice
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2021-06-22 03:28:25 rk4 today my app crashed in the cloud because of a missing package import stanza, in a statically typed compiled language...wat
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2021-06-22 03:29:36 jeho dynamic linking
2021-06-22 03:30:42 rk4 nah, so said language allows you to open a db connection like so: db := sql.Open("db conn str", "mysql")
2021-06-22 03:31:24 rk4 if you don't import a mysql package _somewhere_ (it doesn't have to be in the same file or module as the sql.Open call) it dies at runtime
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2021-06-22 03:33:14 rk4 this is owing to some global state, when you import the mysql package it mutates some state on the sql package
2021-06-22 03:33:58 bertptrs is this go?
2021-06-22 03:34:03 * rk4 coughs
2021-06-22 03:34:49 jeho go's spinoff no-go
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2021-06-22 03:37:43 jeho my coding in rust is getting to the point where it's getting easy
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2021-06-22 03:37:58 sensille jeho: after how many months?
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2021-06-22 03:41:55 jeho about a year I think now
2021-06-22 03:42:36 sensille oh damn, not sure i can keep at it for that long :)
2021-06-22 03:43:03 jeho not enjoying the challenges of it?
2021-06-22 03:43:26 sensille it's not always rewarding
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2021-06-22 03:44:06 rk4 hmm, about 2 years here and i'm still working stuff out. but i think i can do any work task in rust, given work is in go nothing gets too tricky language wise (because it can't)
2021-06-22 03:44:20 rk4 took reading 2 books to get the hang of things
2021-06-22 03:44:52 jeho I"m whipping out my own generic iterators in a flash
2021-06-22 03:44:53 rk4 i think C++ devs have a head start there, i had never encountered smart pointers or RAII
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2021-06-22 03:45:36 jeho yeah.. smart pointers are important for any complex rust program
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2021-06-22 03:46:06 w0x12ef TRPL book and the rust reference ,what is the diff
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2021-06-22 03:47:41 bertptrs TRPL explains things, the reference defines things
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2021-06-22 03:48:11 w0x12ef good answer
2021-06-22 03:48:12 bertptrs unless you like formal definitions, start with TRPL
2021-06-22 03:48:18 jeho that sums it up
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2021-06-22 03:49:11 jeho most of what I know about rust is from the docs
2021-06-22 03:49:42 jeho i spend a lot of time looking up methods, and examples
2021-06-22 03:50:37 w0x12ef if one function requires reference ,but I pass it a value ,what is the result
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2021-06-22 03:53:21 osse compiler error
2021-06-22 03:53:26 jeho the compiler barks at you
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2021-06-22 04:00:59 w0x12ef probably not
2021-06-22 04:01:35 w0x12ef it need a ref ,why not auto cast to a ref
2021-06-22 04:02:01 w0x12ef at the same time , pass ref is secure
2021-06-22 04:04:21 ThinkT510 if you want a function to take take a reference then that is what you need to give it
2021-06-22 04:04:55 ThinkT510 the function signature will dictate what it takes
2021-06-22 04:05:49 w0x12ef ThinkT510, so the compiler accept it
2021-06-22 04:05:52 w0x12ef maybe
2021-06-22 04:05:59 w0x12ef can
2021-06-22 04:06:08 ThinkT510 no
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2021-06-22 04:07:13 ThinkT510 look at the function signature. if it takes a reference then you need to feed it a reference
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2021-06-22 04:07:55 ThinkT510 perhaps you need to brush up on the ownership concept
2021-06-22 04:09:45 w0x12ef ThinkT510, https://play.rust-lang.org/?version=stable&mode=debug&edition=2018&gist=553972acacf6a198bae67a6fdcbc408a
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2021-06-22 04:10:10 w0x12ef fn eq(&self, other: &Self)
2021-06-22 04:10:17 w0x12ef this is the signature
2021-06-22 04:10:27 w0x12ef assert_eq!(x1, x3); this works
2021-06-22 04:11:03 discipulus That looks like a method
2021-06-22 04:11:51 w0x12ef so what
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2021-06-22 04:12:33 ThinkT510 w0x12ef: you've defined the age of x2 as 12 and the age of x1 and x3 as 11. then in line 37 you are asking the compiler to assert that x1 and x2 are equal. they are not equal. one is 11 and the other is 12
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2021-06-22 04:13:36 w0x12ef the question is not the result of the test
2021-06-22 04:13:45 w0x12ef the question is the syntax
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2021-06-22 04:14:18 SpaceManiac w0x12ef: method calls foo.bar() and some macros like assert_eq! and println! autoref, but normal function parameters don't, to make it easier to see if a local variable is being moved or not
2021-06-22 04:15:44 w0x12ef SpaceManiac, what is this use case : assert_failed(kind, &*left_val, &*right_val
2021-06-22 04:17:30 w0x12ef SpaceManiac, if I pass values , what is the meaning of *value
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2021-06-22 04:21:23 ThinkT510 * is used as a dereference operator. if it is not already a reference then the compiler will tell you that you can't dereference it.
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2021-06-22 04:39:10 w0x12ef thecatster_, assert_eq!(x1, x3); x1 is not ref here ,why it not report error
2021-06-22 04:39:26 w0x12ef ThinkT510, ^
2021-06-22 04:40:26 sensille i want to store some items by a given key, but also want to keep them ordered by time of insertion. in C i'd use a tree for that and also put the items in a double linked list. i wonder what a good data structure in rust would be
2021-06-22 04:40:36 ThinkT510 w0x12ef: see what SpaceManiac told you. for a better understanding you can look at the rust docs to see the signatures.
2021-06-22 04:40:54 sensille if i insert an item that's already in the tree it should get bumped in the list
2021-06-22 04:41:50 edmcbane a linked hashmap? https://docs.rs/linked-hash-map/0.5.4/linked_hash_map/
2021-06-22 04:42:10 edmcbane you'd need to do something ad-hoc for the bump on re-insertion though
2021-06-22 04:42:38 w0x12ef SpaceManiac, Probably I just understand the half of what did you say
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2021-06-22 04:46:27 discipulus w0x12ef: The assert_eq! macro adds the reference operator and dereference operator. https://doc.rust-lang.org/src/core/macros/mod.rs.html#35-62
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2021-06-22 04:47:02 sensille edmcbane: looks like a good start, but no bump operation
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2021-06-22 04:47:19 discipulus w0x12ef: remember that assert_eq! is a macro, not a function or method call.
2021-06-22 04:47:36 w0x12ef discipulus, so what does that mean ,&*
2021-06-22 04:48:07 w0x12ef first dereference it ,then get reference
2021-06-22 04:49:38 ThinkT510 where are you seeing &*?
2021-06-22 04:50:29 w0x12ef $crate::panicking::assert_failed(kind, &*left_val, &*right_val, $crate::option::Option::None);
2021-06-22 04:50:29 discipulus I think w0x12ef interpretted "adds the reference operator and dereference operator" as &*. Which is not what I intendent to convey.
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2021-06-22 04:51:51 w0x12ef match (&$left, &$right) ?
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2021-06-22 04:52:40 w0x12ef match operation take its reference ,I see
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2021-06-22 04:53:22 edmcbane sensille: removing and reinserting, in that case, should be easy although inefficient
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2021-06-22 04:58:42 w0x12ef discipulus, am I correct
2021-06-22 04:59:01 w0x12ef just said
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2021-06-22 05:00:00 discipulus yes that's right
2021-06-22 05:00:00 jeho sensille, BTreeMap?
2021-06-22 05:00:20 sensille two of them
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2021-06-22 05:04:40 w0x12ef discipulus, thanks
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2021-06-22 05:17:23 w0x12ef How can I get the disassembly code of rust program
2021-06-22 05:17:52 j`ey same way as with any other compiled program
2021-06-22 05:18:01 j`ey using objdump or some other disassembler
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2021-06-22 05:18:37 w0x12ef j`ey, does struct have a method table at runtime ,which is used for method address query
2021-06-22 05:18:51 w0x12ef like vtable in c++
2021-06-22 05:18:59 j`ey no
2021-06-22 05:19:03 j`ey but dyn Traits do
2021-06-22 05:19:23 w0x12ef how is dyn trait represented at low level
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2021-06-22 05:20:02 j`ey pointer to the data, pointer to the 'vtable'
2021-06-22 05:20:15 w0x12ef what is the address of the vtable
2021-06-22 05:20:33 w0x12ef maybe there is a internal struct in rust
2021-06-22 05:20:48 j`ey what do you mean by internal struct?
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2021-06-22 05:21:31 w0x12ef it describe how the data and vtable linked together
2021-06-22 05:21:38 w0x12ef in memory orfer
2021-06-22 05:21:41 w0x12ef order
2021-06-22 05:22:02 w0x12ef I guess
2021-06-22 05:22:52 j`ey yes, but it's not defined by a spec
2021-06-22 05:22:57 j`ey https://doc.rust-lang.org/std/ptr/struct.DynMetadata.html
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2021-06-22 08:39:17 w0x12ef what do you use to debug rust code
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2021-06-22 08:40:01 Sobek (I'm a terrible person that has mostly been using prints, instead of a decent debugger)
2021-06-22 08:40:15 Sobek <troll> Butterflies </troll>
2021-06-22 08:40:35 w0x12ef print is good
2021-06-22 08:41:07 cehteh lor one of the logging crates
2021-06-22 08:41:08 Sobek Good old gdb should work I think. rust being a compiled language.
2021-06-22 08:41:22 cehteh i rarely (almost never) use a debugger
2021-06-22 08:41:31 w0x12ef gdb is powerful
2021-06-22 08:41:35 Sobek I've done some bare metal rust debigging in bochs using the debugger in it.
2021-06-22 08:42:26 w0x12ef on linux?
2021-06-22 08:42:45 w0x12ef great job
2021-06-22 08:43:28 Sobek radare2 is also cool to use. (In my case I think I used r2 to get a decent understanding what the compiler had prodced assembly wise, and bochs to do the debugging of the assembler.
2021-06-22 08:44:01 w0x12ef perhaps boches is not needed to debug application level
2021-06-22 08:44:19 Sobek It definitely is not recommended for application level :D
2021-06-22 08:44:51 w0x12ef Sobek, where is the rust vtable stored in eld
2021-06-22 08:44:53 w0x12ef elf
2021-06-22 08:45:20 Sobek vtable as in the structure used for dynamic dispatch ?
2021-06-22 08:46:00 Sobek (I mostly do not use dynamic dispatched stuff, so no idea)
2021-06-22 08:46:01 IanWizard FWIW: I just use a flag to enable debugging output, and a logging function, which only prints debug messages if said flag is enabled. That's become my goto solution cross-language and cross-platform.
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2021-06-22 08:46:50 IanWizard I've yet to need any real debugger. Those compile time guarantees also help.
2021-06-22 08:47:56 Sobek print works until it doesn't work anymore. It is true however that rust runtime bugs tend to be different class of bugs than those in C. Segfault usually invites using gdb to investigate, but safe rust isn't supposed to segfault, so.
2021-06-22 08:48:28 kline here's a challenging question id like a steer on. id like to integrate rust in a project that has a plugin system with shared objects. and its all built with autotools. where do i begin to read about this?
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2021-06-22 09:02:14 bertptrs You can build a crate as a cdylib, that would be a start. It's not a very mature ecosystem yet
2021-06-22 09:05:51 Sobek <kline "here's a challenging question id"> It might depend where and how you want to integrate it. I feel like there are two questions : one of them is the build system fun, and the other is how you integrate it architecture wise. (Statically linked, dynamically linked, plugins in rust, rust in the core, rust in the core with a rust plugin API for rust plugins ?)
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2021-06-22 09:08:16 kline Sobek, cdylib
2021-06-22 09:08:36 kline C core with rust cdylib plugins
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2021-06-22 09:10:14 kline https://github.com/solanum-ircd/solanum/blob/main/extensions/drain.c is a start to replace
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2021-06-22 09:10:51 kline it's relatively straightforward to write the code for it, but its the integration to autotools thats the problem
2021-06-22 09:12:57 Sobek https://github.com/lu-zero/autotools-cargo-example
2021-06-22 09:13:26 Sobek It looks like someone has already spent some time on that issue.
2021-06-22 09:14:05 Sobek https://github.com/lu-zero/autotools-rs
2021-06-22 09:14:16 Sobek (That's the other way round integration)
2021-06-22 09:15:44 kline cool
2021-06-22 09:16:17 kline it would be good if every rust module didnt need https://github.com/lu-zero/autotools-cargo-example/tree/master/src/rust
2021-06-22 09:16:33 kline but ill play later
2021-06-22 09:18:29 Sobek https://gitlab.com/flukejones/rust_cargo_autotools/-/tree/master by the same person (and he apparently spent a gsoc on it, but his website seems down :/
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2021-06-22 09:19:35 kline Sobek, its available in cache, ive been reading it
2021-06-22 09:21:53 Ellipsis753 Hi. I have processes that need to communicate via shared memory. Is there a good crate for mutexes, queues, etc? I've found "shared_memory" and it looks alright, but a bit limited and rarely used.
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2021-06-22 09:25:05 Sobek More recent work is https://people.gnome.org/~federico/blog/librsvg-build-infrastructure.html kline
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2021-06-22 09:25:19 kline thakns
2021-06-22 09:26:44 kline Sobek, this one feels like it has the most potential, since its doing a much more similar thing
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2021-06-22 09:32:18 dav1d GAT's as outlined here: https://github.com/rust-lang/rfcs/blob/master/text/1598-generic_associated_types.md `trait Foo { type Output<'a>; } doesnt work, yet, right?
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2021-06-22 09:33:12 bertptrs Nope.
2021-06-22 09:34:42 dav1d :(
2021-06-22 09:35:54 Sobek Perhaps you could look into the implementation effort and propose a PR to the compiler ? o:)
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2021-06-22 09:43:06 dav1d I could ;)
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2021-06-22 09:44:36 osa1 if I define a trait in a no-std crate is there a way to implement the trait in downstream std crates without having to newtype it?
2021-06-22 09:45:46 bertptrs there is not. orphan rules dictate you need to either own the trait or the type
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2021-06-22 09:45:58 bertptrs the usual workaround is an optional `std` feature in your crate
2021-06-22 09:46:15 osa1 OK, thanks
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2021-06-22 10:02:46 w0x12ef what is the meaning of &'static return type
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2021-06-22 10:05:52 raekye w0x12ef: the 'static lifetime is special in that it is alive for the entirety of the program, e.g. a string constant "hello" (which is stored in the binary rather than created each time it gets evaluated). https://doc.rust-lang.org/rust-by-example/scope/lifetime/static_lifetime.html
2021-06-22 10:06:40 raekye loosely speaking it means it returns a reference to some global data
2021-06-22 10:06:52 w0x12ef get it
2021-06-22 10:11:13 w0x12ef raekye, what is the use of *self* in a trait declaration
2021-06-22 10:11:26 w0x12ef trait AppendBar {
2021-06-22 10:11:30 w0x12ef fn append_bar(self) -> Self;
2021-06-22 10:11:31 w0x12ef }
2021-06-22 10:14:33 raekye w0x12ef: The Self "type" refers to whatever type actually implements the trait, e.g. for the Clone trait and its clone() function, the return type of clone() depends on the actual class implementing Clone
2021-06-22 10:15:07 w0x12ef cool , is this just a syntax sugar for self:SelfType
2021-06-22 10:15:55 cehteh mhm its a bit D'oh that std::process::Command isnt copyable ... would be nice if one could prepare a command and then call it multiple times
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2021-06-22 10:16:10 raekye When you have self (or &self, &mut self) it's syntactic sugar for self: Self (I'm not aware of "SelfType"?)
2021-06-22 10:16:30 raekye (&self for self: &Self and &mut self for self: &mut Self correspondingly)
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2021-06-22 10:23:44 jbg cehteh: you don't need to clone it, you can just call the methods that spawn the process multiple times
2021-06-22 10:23:58 jbg the Command itself is a re-usable builder
2021-06-22 10:24:33 cehteh jbg: does .args() reset all args or append? thats not well documented, i am just trying to figure out
2021-06-22 10:24:35 jbg you can see this by the fact that spawn()/output()/etc take &mut self rather than self
2021-06-22 10:24:41 w0x12ef is string literals always static lifetime?
2021-06-22 10:24:51 jbg .args() "Adds multiple arguments to pass to the program" as the docs say
2021-06-22 10:25:02 cehteh jbg: yes i seen that and with env you can clear, but there is no args clear,
2021-06-22 10:25:12 jbg and btw the docs literally say "Command can be reused to spawn multiple processes. The builder methods change the command without needing to immediately spawn the process" near the top
2021-06-22 10:25:27 cehteh so its not really friendly when you want to reuse it with slightly mutated args
2021-06-22 10:26:03 jbg yeah, there does not seem to be a way to clear the args (that I can see, at least)
2021-06-22 10:26:05 jbg which is a bit odd
2021-06-22 10:26:46 cehteh yes .. i wanted to do a test now, coudl be wording in the docs (i'll look at the source in a minute) or it just lacks args_clear
2021-06-22 10:26:48 jbg you can just make a fn that returns the command with everything set up except the args, and then do that_fn().args().spawn() or whatever each time though
2021-06-22 10:27:02 cehteh yes thats what i am doing now
2021-06-22 10:27:10 jbg "add" is quite clear to me, and the impl just calls .arg() repeatedly
2021-06-22 10:27:43 cehteh yes add is clear .. but then the absence of args_clear makes it a bit ugly
2021-06-22 10:27:53 cehteh https://play.rust-lang.org/?version=stable&mode=debug&edition=2018&gist=86402dfd775e452fefa39e0ad2f3b85d
2021-06-22 10:27:54 jbg I don't see any obvious reason why there could not be an args_clear, it's strange that there isn't when there is env_clear
2021-06-22 10:28:10 cehteh is what i am currently came up for testing the binary
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2021-06-22 10:28:56 cehteh well i may open a ticket for that, maybe its some limitation on some OS dunno, i cant really imagine thats the case but who knows .. i havent looked at the docs yet
2021-06-22 10:29:23 cehteh s/docs/source
2021-06-22 10:30:54 jbg you can easily extract uberallfs.call(&["-d", "-v", "objectstore", "ubatest", ... the other args ...]) into a closure and just call that repeatedly
2021-06-22 10:30:57 jbg which looks much tidier
2021-06-22 10:32:04 cehteh yes, but i opted for writing out the exact arguments as they are passed when you do it manually, it has some repetition, but its a testsuite and then easy to see
2021-06-22 10:32:51 cehteh in production code i wont do that, but tests are nice when verbose
2021-06-22 10:33:26 cehteh btw call/fail return the Output .. next thing will be filters on those
2021-06-22 10:34:38 jbg the unix impl for Process.arg is kinda interesting, it builds up argv as it goes, so each call to arg() overwrites the null pointer in argv with the new arg + null
2021-06-22 10:34:56 jbg then it also pushes it to a vec to keep the owned value alive
2021-06-22 10:35:18 jbg as opposed to just pushing it to the vec and then building argv when you call spawn() or whatever
2021-06-22 10:35:44 bertptrs It's a very C-like way of doing things. see: strtok
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2021-06-22 10:37:10 kee Is there something like docs.rs that works in Dillo? Firefox is too heavy to run at the same time as compiling.
2021-06-22 10:38:00 jbg in what way doesn't it work in dillo? I don't think docs.rs is doing anything particularly complex?
2021-06-22 10:38:20 jbg you can build the docs for any crate locally but I guess they won't work in dillo either if docs.rs doesn't
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2021-06-22 10:39:13 cehteh jbg: urgs ... :D now i see ....
2021-06-22 10:39:48 jbg docs.rs works great in lynx btw, so I'm inclined to point the finger at dillo for this one ;)
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2021-06-22 10:43:59 cehteh w3m doesnt work either :D
2021-06-22 10:45:03 cehteh well works somewhat
2021-06-22 10:46:31 jbg you might have to define "work" - it works fine in w3m here, but I define "work" as "I can read the docs"
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2021-06-22 10:47:46 jbg it's hardly convenient, with all the scrolling up and down to navigate, but using lynx/w3m is rarely convenient these days :)
2021-06-22 10:48:26 jbg a rust crate docs <-> man pages bridge, now there's an idea
2021-06-22 10:48:38 jbg `man std::process::Command`
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2021-06-22 10:49:13 cehteh do it
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2021-06-22 10:49:42 cehteh or maybe info pages (because those allow linking)
2021-06-22 10:50:00 cehteh but hey how about html :) ... i mean simple one
2021-06-22 10:50:15 Sobek Well, given the grey beard complaint about documentation in the lkml about rust in linux it might be an instant hit (unless thos greay beard prefer to use GNU Info ?)
2021-06-22 10:50:20 cehteh without alls that overload of css and js
2021-06-22 10:50:58 cehteh manpages are a bit inconvinient when things become bigger
2021-06-22 10:51:02 jbg I dislike GNU info, it feels like browsing the web with lynx/w3m
2021-06-22 10:51:14 cehteh yeah many people dislike it
2021-06-22 10:51:22 jbg but yeah it's a bit of a religious argument
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2021-06-22 10:51:38 cehteh it has some advantages, means structured docs .. but thats also limiting
2021-06-22 10:52:06 jbg but meh, if you bridge to one you might as well bridge to both
2021-06-22 10:52:21 cehteh anyway i guess i see if some already missed the lack of args_clear and other things
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2021-06-22 10:52:47 jbg and why not really? if I can `man strtok` why can't I `man std::str::from_utf8`
2021-06-22 10:52:54 Sobek Hmm, the documentation page are mostly auto generated, I feel it would be possible te create an alternate pipeline that packages the content in a format that can be used more easily to create light weight doc for set-ups where heavy js and css are unwelcome.
2021-06-22 10:53:15 jbg yeah of course
2021-06-22 10:53:25 jbg only the last stage of the pipeline needs to change, to spit out whatever format you want
2021-06-22 10:53:32 cehteh jbg: biggiest adantages of rust manpages is the browsing and interlinking
2021-06-22 10:54:19 jbg that's an advantage, but "biggest advantage" is a matter of opinion and depends on context
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2021-06-22 10:54:26 cehteh and i really dislike that marcdown is used .. another rant but markdown has such a limited / crappy toolchain anytihin beyond html isnt thought of
2021-06-22 10:54:42 cehteh possible but with headdache
2021-06-22 10:54:55 jbg I do find the hyperlinking useful, but I would also find it really useful to be able to quickly look up the description and signature of a method that I already know the exact name of
2021-06-22 10:55:03 Sobek well, links can probably be turned into a see rust::std::...::fmt, which can be opened with a man rust::std::...::fmt This isn't completely broken, except you're likely to open way more pages with rust than you usually do with manpage.
2021-06-22 10:55:59 jbg at the moment I generally type the type/method name into google and usually get there within a click or two
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2021-06-22 10:57:02 cehteh where does one look for std lib issues? https://github.com/rust-lang/rust/issues << is core language only?
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2021-06-22 10:59:44 jbg std's in that repo too (library/std)
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2021-06-22 11:03:04 cehteh ok found no related ticket yet .. strange that no one needed that yet
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2021-06-22 11:24:09 bertptrs not too strange. useful as they are man pages have a terrible ux
2021-06-22 11:24:53 bertptrs ddg's !rust bang works fine. The !drs bang works for other crates
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2021-06-22 11:26:59 dav1d regarding static: "<raekye> loosely speaking it means it returns a reference to some global data" - 'static is also when something is owned, right? Because it doesnt have to life the entirety of the program, but it *could*
2021-06-22 11:28:31 dav1d Ah, found the thing I was remembering: https://github.com/pretzelhammer/rust-blog/blob/master/posts/common-rust-lifetime-misconceptions.md#2-if-t-static-then-t-must-be-valid-for-the-entire-program
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2021-06-22 11:31:18 Ellipsis753 Does Mutex<> work between processes via shared memory? (Or only threads within a single process?)
2021-06-22 11:33:28 bertptrs Threads within a single process
2021-06-22 11:34:01 bertptrs For IPC you'll need something else
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2021-06-22 11:36:02 SoF hi, is there a format string (like {:?}) that allows me to say "indent this string incl. all newlines this string returns"?
2021-06-22 11:36:36 dav1d I have two trait implementations, I want to choose at runtime which one to use (DebugParser vs NormalParser, both implement Parser), I know I can do that via dynamic dispatch and a box. But I would like to do it with an Enum, e.g. either::Either, does Either auto implement the trait (it doesnt seem to), can I implement the trait, or should I make
2021-06-22 11:36:36 dav1d my own Either version just for my usecase?
2021-06-22 11:36:38 SoF so "{:? indent=4}", String::from("a\nb") would return " a\n b"
2021-06-22 11:39:30 dav1d SoF: https://play.rust-lang.org/?version=stable&mode=debug&edition=2018&gist=e7fb8a9445c2ad09995952b22f02e7a3
2021-06-22 11:39:37 dav1d ah nvm
2021-06-22 11:39:42 dav1d I just see what you mean
2021-06-22 11:41:39 SoF thanks for trying :)
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2021-06-22 11:43:26 SoF dav1d: you can implement your own trait for external types
2021-06-22 11:43:42 SoF impl<A, B> MyTrait for either::Either<A, B> { etc. }
2021-06-22 11:44:10 dav1d SoF, yeah, but I would have to do that in the same place where I define the trait, right? e.g. I can't do it only in example/main.rs?
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2021-06-22 11:44:44 jbg you have to do it either in the crate of Either or the crate of MyTrait
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2021-06-22 11:44:49 jbg it doesn't matter which module of that crate
2021-06-22 11:44:50 SoF ah I see. if the compiler complains, you can make an empty trait, dav1d
2021-06-22 11:44:58 SoF so MyTrait2: MyTrait
2021-06-22 11:45:13 SoF then MyTrait2 is defined in example/main.rs and you can impl it for Either
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2021-06-22 11:45:42 jbg SoF I don't think that will work, since you won't be able to impl MyTrait2 for Either (since MyTrait is not implemented for it)
2021-06-22 11:45:46 Ellipsis753 bertptrs: Thanks.
2021-06-22 11:46:03 jbg Trait2: Trait is not inheritance, it's specifying requirements
2021-06-22 11:46:23 SoF oh right, I confused something
2021-06-22 11:46:41 jbg you can make a newtype though and impl the trait for that
2021-06-22 11:48:26 dav1d mh, thanks, so best option seems to be to just make a new enum which implements the trait
2021-06-22 11:49:00 jbg making your own Either seems fine
2021-06-22 11:49:38 j`ey make a crate called 'mope', like there's 'mopa'
2021-06-22 11:49:47 j`ey My Own Personal Either
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2021-06-22 11:59:44 dav1d :D
2021-06-22 12:00:00 dav1d I wish there was a way to auto implement all traits that Left and Right implement together
2021-06-22 12:00:03 tomboy64 ugh. i'm having a bit of a brainblock rn. how do i get (e.g. remove and use) some random element in a HashSet?
2021-06-22 12:00:16 dav1d isnt there .remove()?
2021-06-22 12:00:49 dav1d ah, it's take: https://doc.rust-lang.org/std/collections/struct.HashSet.html#method.take
2021-06-22 12:00:52 tomboy64 dav1d: that requires the element. or rather a reference to it
2021-06-22 12:00:53 dav1d tomboy64: ^
2021-06-22 12:01:10 dav1d oh sorry, it's late for me
2021-06-22 12:02:10 tomboy64 ^^
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2021-06-22 12:10:34 Hans-Martin I'm using VS code with Rust Language Server, and since yesterday the rls seems to be stuck on startup. This happens in several rust project directories. Tried killing rls processes, cargo clean, etc. Ist there any known current problem?
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2021-06-22 12:11:00 Hans-Martin platform is linux if that matters...
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2021-06-22 12:15:07 GreenJello Hans-Martin, I don't think the RLS is maintained anymore? Try switching to rust-analyzer
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2021-06-22 12:15:30 Hans-Martin ah, that's an idea. will try it
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2021-06-22 12:24:22 bertptrs tomboy64: drain().next() work for you?
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2021-06-22 12:27:17 bertptrs evalr2: use std::collections::HashSet; let mut s = HashSet::from_iter([1, 2, 3]); print!("{:?}", s.drain().next()); s
2021-06-22 12:27:19 -- Notice(evalr2): bertptrs: error[E0599]: no function or associated item named `from_iter` f ...
2021-06-22 12:27:20 -- Notice(evalr2): bertptrs: https://play.rust-lang.org/?version=stable&mode=debug&edition=2018&gist=6c04dcb49c5c4229c2ff492ddc576815
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2021-06-22 12:28:06 tomboy64 bertptrs: that empties the container completely even when the iterator is not exhausted and makes the rest of the set unusable right away.
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2021-06-22 12:28:48 bertptrs huh, you're right, that's rather inconsistent
2021-06-22 12:29:44 bertptrs With Vec you can make this work, but not with HashSet it seems
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2021-06-22 12:36:17 cehteh jbg: fyi https://internals.rust-lang.org/t/lack-of-api-mutating-args-at-std-command/14908
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2021-06-22 12:58:33 kee Is there something like docs.rs that works in Dillo? Firefox is too heavy to run at the same time as compiling.
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2021-06-22 13:09:51 Polochon_street hi! Let's say I have a binary, with a main function that uses clap for argument parsing. Is there an easy way to test it using the default testing suite? Or should I just test its components, and assume the argument parsing is 💯 ?
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2021-06-22 13:11:05 GreenJello in addition to unit tests you can write integration tests that execute the binary and inspect output
2021-06-22 13:11:15 GreenJello you ideally have both
2021-06-22 13:12:07 GreenJello if you don't have integration tests, then you'd want to document procedures on what to manually test before cutting a release
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2021-06-22 13:18:38 Ellipsis753 What guarantees are there around fork()ing and the Rust stdlib? I'm building a shared lib that's loaded into a process which then forks into several processes. Is this problematic because stdlib initializes before it's forked, or is that supported?
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2021-06-22 13:23:59 Hans-Martin GreenJello switching to rust-analyzer helped, thx
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2021-06-22 13:32:27 belcher iv created my own struct, and im using .collect() to try to create a Vec<MyStruct>, i get the error message "help: the trait `FromIterator<&MyStruct>` is not implemented for `Vec<MyStruct>`"... but when i look at the page for FromIterator i get the impression the trait is only meant to implemented on collections, my struct isnt a collection it just represents one thing... am i missing something in the understanding?
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2021-06-22 13:33:20 j`ey belcher: its the &
2021-06-22 13:33:37 belcher right, the reference
2021-06-22 13:33:41 j`ey sounds like youre iterating over &Struct, not Struct
2021-06-22 13:33:53 j`ey so you cant build a Vec<Struct> from that
2021-06-22 13:34:14 GreenJello .cloned().collect() might work, though
2021-06-22 13:34:15 j`ey (you can clone, by adding .cloned() before the collect())
2021-06-22 13:34:19 belcher hmm yes, my code inside map() at one point uses vec.get() and that returns an Option<&MyStruct>
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2021-06-22 13:35:15 j`ey you either need to clone or somehow take ownership, use remove instead of get() maybe)
2021-06-22 13:36:32 Karel I remember reading a blog post about rustfmt internals a while ago, that explained why code formatting is more difficult then expected (something with comments and heuristics for overflowing lines). But I can't find the post anymore, does anyone have the link?
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2021-06-22 13:39:48 dav1d is there a writeup about how the default allocator works? I asumme it's more than a simple malloc & free, but also caches memory blocks etc.
2021-06-22 13:40:39 j`ey the default does default to malloc/free
2021-06-22 13:40:55 j`ey but malloc/free does those tricks!
2021-06-22 13:41:14 belcher ty for the help(!)
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2021-06-22 13:44:53 dav1d j`ey, oh, interesting. I always assumed jemalloc was replaced with a custom implementation
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2021-06-22 13:46:03 j`ey dav1d: the default was jemalloc, now its the system allocator
2021-06-22 13:46:20 dav1d thanks!
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2021-06-22 14:10:12 Polochon_street GreenJello: though it's not really possible to do integration testing with the default Rust suite, right? Since you'd need to launch the binary somehow
2021-06-22 14:11:24 GreenJello Polochon_street, there are crates like assert_cmd that make it easy
2021-06-22 14:11:43 Polochon_street oh, didn't know that. Thanks!
2021-06-22 14:11:43 GreenJello iirc it does produce the binary before running integration tests
2021-06-22 14:11:51 GreenJello even without a crate
2021-06-22 14:12:19 GreenJello it's just handling different targets and debug vs release in the cargo test options that's tricky
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2021-06-22 14:32:33 Hans-Martin does anyone know how to beat libp2p into submission? my chat app variant connects nicely using mdns, but not when I try to dial a peer explicitly by IP
2021-06-22 14:32:50 Hans-Martin or is libp2p off-topic?
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2021-06-22 14:38:34 capitol no, but there might not be anyone here who has experience with it
2021-06-22 14:39:05 Hans-Martin thought so. somewhat esoteric stuff.
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2021-06-22 14:40:22 Hans-Martin hard enough to learn a new library but wrapping your head around async/await and type system magic when coming from a simple objekt oriented language is really bad :-)
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2021-06-22 14:45:15 obviyus writing some functional code purely using iterators is such a joy
2021-06-22 14:46:10 obviyus especially when you start messing around with scan() and fold() \o/
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2021-06-22 14:51:08 kee Can I assume std::time::Instant is good enough for a game loop?
2021-06-22 14:54:27 GreenJello kee, should be good for that
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2021-06-22 15:06:07 ska In https://github.com/samuelsleight/neil there is a src/problem.rs that needs an implentation. Can I compile that existing code into a library and then have a separate code that imports it?
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2021-06-22 15:08:36 GreenJello ska, it seems to already be published to crates.io, so you could depend on it
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2021-06-22 15:24:32 ska GreenJello: how did you verify that?
2021-06-22 15:25:11 ska I suppose just search crates.io.
2021-06-22 15:27:24 ska GreenJello: Then my next question: what do I do to import it into my code? 'extern crate neil' ?
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2021-06-22 15:28:53 GreenJello in Cargo.toml: [dependencies]
2021-06-22 15:28:53 GreenJello neil = "0.2"
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2021-06-22 15:29:11 IlPalazzo-ojiisa To quote the nomicon: “BTreeMap doesn't really make sense for partially-ordered types, and so it requires that its keys implement Ord. However, BTreeMap has Unsafe Rust code inside of its implementation. Because it would be unacceptable for a sloppy Ord implementation (which is Safe to write) to cause Undefined Behavior, the Unsafe code in BTreeMap must be written to be robust against Ord implementations which aren't actually total —
2021-06-22 15:29:11 IlPalazzo-ojiisa […]”
2021-06-22 15:29:12 GreenJello in your .rs file: use neil::Problem;
2021-06-22 15:29:22 GreenJello and you can view the docs here https://docs.rs/neil/0.2.0/neil/
2021-06-22 15:29:37 IlPalazzo-ojiisa My question is: does this robustness lead to run-time costs? If so, how large are those costs?
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2021-06-22 16:21:43 talin hello. i am trying to do a rust tutorial, but i can't figure out how to make an interator. i get a failure on line 22 here where i try to push an item onto a vec: https://play.rust-lang.org/?version=stable&mode=debug&edition=2018&gist=e109036019047931edd3a5056f7aadbd
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2021-06-22 16:22:42 phryk is it somehow possible to set arbitrary rustc parameters from Cargo.toml?
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2021-06-22 16:25:38 kron phryk: no, but from .cargo/config
2021-06-22 16:25:53 phryk kron: not good enough. :/
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2021-06-22 16:26:24 phryk trying to package a piece of rust software and am getting failures because of missing SONAME – i know there's a rustc flag to set it, but i can't just set it through env vars because there's multiple shared objects being built – but all of them seem to have their own Cargo.toml…
2021-06-22 16:27:50 phryk and the OS in question doesn't have a package for patchelf, otherwise I'd just add a build-time dep and patch the SONAMEs in with that… :F
2021-06-22 16:28:03 kron talin: you can dereference a &T into a T manually by doing *x. So you can call clone on T by doing (*x).clone(), although that is one of the uglier variants
2021-06-22 16:28:31 dav1d talin, the problem is, you push &T into the vector
2021-06-22 16:29:33 dav1d talin: for your example: https://play.rust-lang.org/?version=stable&mode=debug&edition=2018&gist=402a1c95fddc8c22863d02c10d26e777 because all your items are Copy
2021-06-22 16:30:08 dav1d now depending on what you want, you could let your iterator return references (and mess around with lifetimes) or require the Clone bound and clone the items
2021-06-22 16:31:21 dav1d e.g. just setting the ` + Clone` bound would be enough for your example
2021-06-22 16:31:50 Midjak I am trying to find how to change the selected text background color in customize-faces. Do you know what it is ?
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2021-06-22 16:32:20 Midjak ok region
2021-06-22 16:33:13 talin thank you guys
2021-06-22 16:33:22 dav1d talin: what you probably want is to implement the into_iter trait which can consume your inner
2021-06-22 16:33:27 talin kron: why are there parenthesis around the (*x)?
2021-06-22 16:34:01 dav1d (*x).clone() vs *(x.clone())
2021-06-22 16:34:39 talin aah, i see
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2021-06-22 16:35:56 talin when it says "impl<T> Groups<T>" what do the two Ts signify? i mean, they represent a generic type, but what does the first and second T define it for?
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2021-06-22 16:37:31 dav1d T can be any type in your example, impl<T> says this requires a generic T, Groups<T> means you give that T to the groups struct
2021-06-22 16:38:32 Midjak oh sorry wrong channel
2021-06-22 16:39:26 mrmonday phryk: from a quick look at the docs it looks like you should be able to do it with a build.rs file, I'm not sure if there's a better way or not
2021-06-22 16:41:14 phryk mrmonday: can you point me at the place in the docs you found this?
2021-06-22 16:41:45 mrmonday phryk: https://doc.rust-lang.org/cargo/reference/build-scripts.html?highlight=link-arg#outputs-of-the-build-script
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2021-06-22 16:42:34 mrmonday I'm guessing `cargo:rustc-cdylib-link-arg=FLAG` is what you need
2021-06-22 16:42:37 talin dav1d: aaah, that makes sense. thank you
2021-06-22 16:43:16 dav1d talin, I am failing to come up with an easy example ...
2021-06-22 16:44:52 dav1d it becomes more useful when implementing traits
2021-06-22 16:45:02 dav1d s/useful/clear/
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2021-06-22 16:48:07 phryk mrmonday: thanks. will build.rs be invoked by cargo automatically, if it exists?
2021-06-22 16:49:03 phryk ah nvm [package]\n…build="foo.rs"
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2021-06-22 16:49:54 Bish o/
2021-06-22 16:49:56 phryk oh, but build.rs honored by default. at least that much makes sense.
2021-06-22 16:50:28 mrmonday phryk: yeah, scroll to the top of the page for an example - just drop a build.rs in the root next to the Cargo.toml and it will be picked up
2021-06-22 16:50:58 mrmonday if whatever you're packaging already has a build script you'll need to modify that instead
2021-06-22 16:51:37 -- Lohn is now known as lohn2
2021-06-22 16:53:07 phryk mrmonday: the executables already have build.rs scripts, the shared libs don't.
2021-06-22 16:53:27 phryk also, funny, cargo:rustc-link-arg was explicitly added to enable adding SONAME
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2021-06-22 16:59:28 phryk mrmonday: do I see it right that the "cargo:rustc-cdy…" thing just goes into a `println!()`?
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2021-06-22 17:01:07 mrmonday pretty much, yep
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2021-06-22 17:01:25 phryk also, is there a way for the build.rs script to easily access info from within the associated Cargo.toml? Being able to pull the version out of there would eliminate the need to update the build.rs on every release…
2021-06-22 17:01:35 phryk (want to make this a PR upstream
2021-06-22 17:01:36 phryk )
2021-06-22 17:02:25 mrmonday phryk: https://doc.rust-lang.org/cargo/reference/environment-variables.html#environment-variables-cargo-sets-for-crates
2021-06-22 17:03:16 phryk mrmonday: noice, much obliged.
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2021-06-22 17:04:42 cehteh phryk: there is the cargo metadata crate which lets you extract things from cargo in more or less ugly way, i am using that from build.rs (in the more ugly way)
2021-06-22 17:06:01 phryk cehteh: read the link mrmonday posted, some extremely helpful things in there.
2021-06-22 17:06:23 cehteh i know that, but in my case that was not enough
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2021-06-22 18:26:36 routeveg Hi all
2021-06-22 18:26:46 routeveg I've just tried to write something realistic in Rust, and hit a probem
2021-06-22 18:26:48 routeveg *problem
2021-06-22 18:26:50 routeveg https://play.rust-lang.org/?version=nightly&mode=debug&edition=2021
2021-06-22 18:27:02 -- dwt is now known as dwt27
2021-06-22 18:27:12 j`ey routeveg: click share
2021-06-22 18:27:21 -- dwt27 is now known as cillian64
2021-06-22 18:27:28 routeveg Oops! https://play.rust-lang.org/?version=nightly&mode=debug&edition=2021
2021-06-22 18:27:42 j`ey routeveg: click share :P
2021-06-22 18:27:42 routeveg Wait, no https://play.rust-lang.org/?version=nightly&mode=debug&edition=2021&gist=b763ffe7536df83e2ab412b490c66824
2021-06-22 18:27:45 routeveg There!
2021-06-22 18:28:10 -- cillian64 is now known as dwt
2021-06-22 18:28:19 routeveg So, the problem is that map is still borrowed in the 'None' block of the match, which makes sense - but that means I can't add things to it!
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2021-06-22 18:30:18 danieldg routeveg: look at map.entry
2021-06-22 18:30:57 danieldg it has some nice functions to get-or-insert-if-not
2021-06-22 18:31:13 ssbr_ routeveg: I usually work around this by moving code to outside of the match, although in this case that wouldn't help because of the long borrow. entry would work.
2021-06-22 18:32:00 ssbr_ (i.e. the match is borrowing for 'a -- so in fact it's borrowed for the whole rest of the function. Even if you move code outside of the match you still can't use it!)
2021-06-22 18:32:23 routeveg Looks like map.entry does what I need here, so thanks for pointing me at that :)
2021-06-22 18:32:33 routeveg But i'm still bothered about how-to-make-it-work-without-entry
2021-06-22 18:32:41 routeveg ssbr_: Yes, exactly i am hitting that too!
2021-06-22 18:33:01 danieldg routeveg: you basically have to move that last get_mut.unwrap outside the match and return it
2021-06-22 18:33:02 routeveg I feel like if I can properly understand how to make this work, I will have levelled up
2021-06-22 18:33:16 danieldg it's a limitation of the borrow checker
2021-06-22 18:33:28 ssbr_ I think last time I ran into something like this (and couldn't solve it via something like entry) I used an unsafe lifetime transmute :-T
2021-06-22 18:33:32 routeveg I did that but as ssbr_ said, map remains borrowed for the rest of the function
2021-06-22 18:33:33 ssbr_ ISTR polonius fixed it
2021-06-22 18:33:37 danieldg i.e. what you want is valid but isn't allowed
2021-06-22 18:38:39 routeveg So I guess the problem is that at the first borrow, the lifetime of whatever we return becomes tied to the lifetime of the SessionMap, whether we return whatever came out of get_mut or not
2021-06-22 18:39:05 routeveg This stuff hurts my head, ngl
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2021-06-22 18:41:40 ChaiTRex routeveg: Here it is with Entry: https://play.rust-lang.org/?edition=2021&gist=8664bde393955fa19f3bbd616ac8e45f
2021-06-22 18:41:56 phryk How do I get cargo to write build logs?
2021-06-22 18:43:01 ChaiTRex You can also, if you want to, remove the lifetime.
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2021-06-22 18:55:18 ssbr_ How does one structure a procedural macro crate so that it can be tested? You can't use a proc macro from the same crate -- do you just have the proc macro crate have zero tests, and include it from your other crate which does have tests, including for the proc macro?
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2021-06-22 19:35:50 w0x12ef static mut el: *mut GlobalConfig = 0 as *mut _;
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2021-06-22 19:36:06 w0x12ef what is the semantic of this clause
2021-06-22 19:36:56 Mutabah what do you mean
2021-06-22 19:37:08 Mutabah It defines a mutable global variable
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2021-06-22 19:41:55 routeveg ChaiTRex: Thanks! That seems rather neat and entirely reasonable
2021-06-22 19:42:19 routeveg Though I would like to understand what particular quality this problem has, so as to be so difficult to achieve without entry
2021-06-22 19:42:43 routeveg Like, in terms of lifetimes, what is it about the function that I tried to write that makes it hard?
2021-06-22 19:43:48 routeveg I suppose some statements can be made, like: "rust doesn't know that you aren't going to stuff the SessionMap into the mutable session thing, meaning that the session needs to live at least as long as the session map.
2021-06-22 19:44:35 w0x12ef Mutabah, what is *mut _
2021-06-22 19:45:13 routeveg w0x12ef: * is a mutable pointer I believe. It's like a &mut, but for pointing at stuff that can be manipulated with unsafe { } blocks
2021-06-22 19:45:26 routeveg I mean, "*mut is a mutable pointer"
2021-06-22 19:45:55 GreenJello w0x12ef, _ is short for GlobalConfig here
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2021-06-22 19:46:05 GreenJello it's an elided type
2021-06-22 19:46:24 w0x12ef hmm
2021-06-22 19:46:30 w0x12ef syntax sugar
2021-06-22 19:48:32 w0x12ef if el == 0 as *mut _ {
2021-06-22 19:48:36 w0x12ef el = Box::into_raw(Box::new(LuaEngine::new(Lua::new())));
2021-06-22 19:48:37 w0x12ef }
2021-06-22 19:48:40 w0x12ef &mut *el
2021-06-22 19:48:58 w0x12ef what is the meaning of &mut *el
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2021-06-22 19:52:51 routeveg w0x12ef: Looks like it is getting a regular rust &mut reference to the thing pointed by the pointer
2021-06-22 19:55:06 w0x12ef probably , if the return is a &mut , do I need to use a &mut to receive it
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2021-06-22 19:56:39 routeveg So, that check appears to be looking for a NULL pointer. If el is a null pointer, it then allocates a new box, sets the pointer to that box's address, then returns a &mut to the new Box
2021-06-22 19:56:54 routeveg This is just me guessing btw. I haven't done any unsafe rust
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2021-06-22 20:04:50 w0x12ef routeveg, unsafe stuff is bad ?
2021-06-22 20:05:23 Mutabah `*` dereferences the raw pointer, and then the `&mut` takes a mutable borrow/reference to the pointed-to data
2021-06-22 20:05:58 Mutabah and yes, `unsafe` is often seen as bad (as the compiler can't check the validity of unsafe operations, it's all on the programmer to maintain correctness)
2021-06-22 20:08:46 w0x12ef Mutabah, golang unsafe is learning from rust ?
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2021-06-22 20:13:37 Mutabah uhhh... what do you mean by that?
2021-06-22 20:14:02 Mutabah Ah, the go `unsafe` package
2021-06-22 20:14:22 Mutabah not sure... with rust it's closer integrated with the language
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2021-06-22 20:37:07 w0x12ef Mutabah, Should I always create global pointers with Box new ? for nonglobal pointers,Box is not needed ?
2021-06-22 20:38:14 davros https://vimeo.com/566342045 got 'forward+' lighting in my rust engine
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2021-06-22 20:40:06 ChaiTRex routeveg: The reason your code doesn't work is because you .get_mut a value that's in the map. You don't want that value's contents to change behind the scenes while you're using it, because that could be confusing. Yet, you insert into the map while you're using the value. Inserting into the map could change the value behind the scenes.
2021-06-22 20:40:26 ssbr_ w0x12ef: Functions that don't require ownership will accept a &T, which you can pass in even if you just have a local T (as long as that has the correct lifetime).
2021-06-22 20:40:45 ssbr_ w0x12ef: if they require ownership, they'll want a Box<T> or other owner pointer type, and you will have to make one that the function accepts.
2021-06-22 20:40:57 ChaiTRex The idea is that you either have an immutable reference, and it won't change behind the scenes, or you have a mutable reference, and only you can change it (via that mutable reference).
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2021-06-22 20:59:06 w0x12ef_ for function ,any reference must have an annotated lifetime ?
2021-06-22 20:59:22 w0x12ef_ any reference being returned must have the same lifetime as an input or be static.
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2021-06-22 21:00:46 ssbr_ w0x12ef_: Those are two different questions, right? First question: the lifetime can be implicit/inferred. Second question: technically, you can also use a lifetime from your type definition, if you are a method, but maybe count that as an "input".
2021-06-22 21:01:20 ssbr_ for example, you could do: impl<'a> Foo<'a> {fn bar(&self) -> &'a T {...}}
2021-06-22 21:01:30 ssbr_ this occurs in real life sometimes, even :)
2021-06-22 21:02:58 ssbr_ davros: strong quake 2 "very excited about dynamic lighting" vibes on those bullets. Nice! :D
2021-06-22 21:03:48 w0x12ef_ ssbr_, why the impl also need a lifetime annotation
2021-06-22 21:04:36 ssbr_ w0x12ef_: this is an example type that uses it -- the point is that if your type has a lifetime for something inside it, then that itself is also in scope for methods to use in their lifetime annotations
2021-06-22 21:05:09 ssbr_ w0x12ef_: an example of such a type might be pub struct Foo<'a>(&'a T); impl<'a> Foo<'a> {fn bar(&self) -> &'a T {self.0}}
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2021-06-22 21:05:42 w0x12ef_ ssbr_, ok,how to describe a lifetime that must live longer than the function
2021-06-22 21:06:07 ssbr_ w0x12ef_: any lifetime parameter will work.
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2021-06-22 21:06:30 w0x12ef_ fn invalid_output<'a>() -> &'a String { &String::from("foo") }
2021-06-22 21:07:08 ssbr_ w0x12ef_: it is not possible to create a local which outlives the function
2021-06-22 21:07:19 ssbr_ w0x12ef_: you can return a String by value, but you can't return a reference to a local
2021-06-22 21:07:55 w0x12ef_ yes
2021-06-22 21:09:10 w0x12ef_ ssbr_, the 'a lifetime of the return type ,is it longer than the function itself
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2021-06-22 21:10:33 ssbr_ w0x12ef_: it's anything the caller wants it to be, which is always at least as long as the function call (because it isn't possible to have a 'a that begins before a function call, and ends inside the function)
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2021-06-22 21:14:19 w0x12ef_ ssbr_, here the 'a is constraining the return type to prevent return local reference
2021-06-22 21:14:42 w0x12ef_ so the code cannot compile
2021-06-22 21:15:16 ssbr_ right.
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2021-06-22 21:22:19 w0x12ef_ do I need to define lifetime for a function itself
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2021-06-22 21:27:04 danieldg w0x12ef_: only references have defined lifetimes
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2021-06-22 21:27:35 danieldg functions are generally 'static
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2021-06-22 21:28:31 w0x12ef danieldg, so no concern for non reference types for lifetime
2021-06-22 21:29:18 danieldg yep
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2021-06-22 21:41:31 meltyness "Some existing libraries on crates.io can help with writing a program that accepts command line arguments," that's gonna be a yikes from me, dog.
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2021-06-22 21:44:42 Mutabah meltyness: Hmmm?
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2021-06-22 21:46:19 meltyness Just kind of a "gee willikers" you feel me, kinda "sweet zombie jesus" kinda thing.
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2021-06-22 21:49:46 Mutabah I got that impression, but why do you say that?
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2021-06-22 21:52:56 Mutabah meltyness: Do you not like the idea of pulling in libraries?
2021-06-22 21:53:36 Mutabah (You _can_ access the command line using `std`, but it's just so easy to pull in getopts/clap/structopt and get a nicer interface)
2021-06-22 21:53:38 meltyness That seems like a weird place to put a shim.
2021-06-22 21:55:04 meltyness I mean if the command line is that complicated, it seems like it would be easier to step up to a YAML
2021-06-22 21:55:16 meltyness Especially given rusts excellently succinct and legible error handling
2021-06-22 21:55:28 mike-burns Parsing command-line arguments is complicated in every language.
2021-06-22 21:55:40 Mutabah well... for certain definitions of complicated
2021-06-22 21:55:52 Mutabah but, it is string handling, and kinda mindless to write
2021-06-22 21:56:09 Mutabah much easier to pull in a library that does all the work for you and gives good parsing and error messages
2021-06-22 21:57:11 w0x12ef golang rust c++ objectc , are all c family language ?
2021-06-22 21:57:49 danieldg depends on how you define family, but maybe
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2021-06-22 21:58:24 cehteh well i did that in C 300 loc .. inkl help and meaningful error message .. *but* think like clap can do a lot more than simple commandline parsing
2021-06-22 21:58:25 discipulus like system's programming language?
2021-06-22 21:58:38 discipulus systems
2021-06-22 21:59:12 w0x12ef no java
2021-06-22 21:59:22 w0x12ef so
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2021-06-22 22:03:06 GreenJello meltyness, with structopt you could have one set of types that can each be derived from command line arguments or yaml/json/etc
2021-06-22 22:04:19 GreenJello but there are cases where it saves thousands of lines of code even without that requirement
2021-06-22 22:05:41 meltyness i haven't written any middleware myself, but yeah i guess when you get into a big ugly monolith like the linux "ip" commands, something like that would have been useful probably
2021-06-22 22:05:47 GreenJello (I have a CLI where there are subcommand enums 3 or 4 levels deep, and specific options at each leaf, and --help/readme generated from the types)
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2021-06-22 22:12:23 routeveg ChaiTRex: I guess the thing I don't quite get is *why* does the mutable borrow of 'map' live on for the rest of the function
2021-06-22 22:13:34 routeveg Couldn't it just end after the map.get_mut call, once the return value from that goes out of scope?
2021-06-22 22:14:48 routeveg I assume it's something to do with the 'a lifetime being applied to both the map and the return value; that the latter is basically telling rust that a mutable borrow must last for this whole function
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2021-06-22 22:17:03 ChaiTRex routeveg: As far as the scope, the Nono match arm is the result of the map.get_mut call, and it's in scope throughout that match arm.
2021-06-22 22:17:08 ChaiTRex None
2021-06-22 22:17:31 ChaiTRex The borrow checker could get smarter, though.
2021-06-22 22:18:08 danieldg routeveg: since the borrow is being returned, it lasts "beyond" the return of the function, and there's currently no support for seeing that this doesn't matter for all returns
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2021-06-22 22:42:11 ssbr_ routeveg: that's exactly right w.r.t. 'a -- since you are returning the reference, that return *forces* the borrow to be for 'a, and that outlasts even the match statement.
2021-06-22 22:42:44 ssbr_ routeveg: so no matter what you do, *even if you didn't actually run that return statement*, the fact that you borrowed something for 'a means it's borrowed for 'a, and you can't do anything more with it since that was a mutable borrow.
2021-06-22 22:43:49 ssbr_ (to which I think the solutions are "use polonius" (maybe?), "structure it s.t. you can run code in both arms of the match (e.g. via using entry instead), or "unsafe code")
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2021-06-22 22:51:02 ssbr_ routeveg: it took me a long time to appreciate what was going on here (ran into this issue like three times before it clicked). FWIW, I remembered right, polonius *does* fix this: https://godbolt.org/z/6rP7rc3r8
2021-06-22 22:51:59 ssbr_ if you remove the -Zpolonius there, then you get an error because the match borrows the value for 'a. Add it back, and it's fine. Of course you probably can't really use polonius, but take this as evidence that someday you won't need to care about this :)
2021-06-22 22:53:01 ssbr_ (not sure why the rust playground doesn't let you specify flags like that, that I can see. So handy!)
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2021-06-22 23:02:05 routeveg Ah, I am starting to see! Thanks ssbr_ and danieldg
2021-06-22 23:02:23 routeveg I also didn't know about compiler explorer before; looks pretty interesting/useful
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2021-06-22 23:17:57 w0x12ef is there context bind for variables
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2021-06-22 23:20:33 dataangel If I write a lot of code where I need const generic arguments should I just give rust another try in a couple of years? I can't tell if it's me or language learning pains but the feature seems pretty nerfed even compared to C++98.
2021-06-22 23:23:48 [code] dataangel: well it is quite new. apis are still being converted over to it
2021-06-22 23:24:08 [code] c++ has had const exprs for quite a while
2021-06-22 23:24:29 dataangel This is separate from `const fn` though
2021-06-22 23:24:39 dataangel this is just being able to have ints as template args
2021-06-22 23:24:48 dataangel which C++ has handled fine for 22+ years
2021-06-22 23:25:02 [code] then use C++ if it works better for you
2021-06-22 23:25:19 dataangel It just sucks having to give up on the other benefits
2021-06-22 23:25:48 [code] rust is adding that sort of thing. but it'll be a while before it's as useful
2021-06-22 23:26:22 dataangel I would prefer to start a project with rust to head off the inevitable memory management mistakes in C++. Every C++ project I've worked on has inevitably resulted in mysterious things people can't fix had lots of waiting for valgrind/sanitizer runs
2021-06-22 23:26:35 dataangel Borrow checker and mutability xor aliasing by default is a real benefit
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2021-06-22 23:27:35 dataangel But not being able to propagate a constant from one generic function to another because there happens to be a signed to unsigned conversion, or because I need to do something super trivial like divide, etc breaks my ability to write zero cost abstractions
2021-06-22 23:28:47 dataangel And sometimes I realize work arounds but it's a new puzzle every time
2021-06-22 23:29:40 [code] what are you using it for? array length sizing?
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2021-06-22 23:31:50 dataangel I have something kinda like BTree but where the B is configurable via generic constant
2021-06-22 23:32:12 [code] you trying to port your C++ data structures to rust?
2021-06-22 23:32:20 dataangel So it ends up being used in array sizing but also in a bunch of math for computing indexes and things like that
2021-06-22 23:32:52 dataangel nah this is from scratch but I've done enough C++ templates easily expressed in a generic way there, it is only challenging to do in rust
2021-06-22 23:33:07 [code] well rust can do that now.
2021-06-22 23:33:19 [code] via const generics
2021-06-22 23:33:37 dataangel only for the simplest possible examples where you do no computation on the value and don't need to pass it to other generic functions
2021-06-22 23:33:43 [code] it was just released in 1.51
2021-06-22 23:33:44 dataangel it breaks down pretty trivially
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2021-06-22 23:34:02 [code] yeah it's the simplest form
2021-06-22 23:36:16 [code] dataangel: i'd probably just use a Vec and with_capacity()
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2021-06-22 23:51:40 discipulus I'm still on §15.6 of TRPL. I realize now that RefCell<T> doesn't allocate heap space. It's storing T on the stack. The book didn't mention that.
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2021-06-22 23:57:42 Mutabah Why would the book mention when something isn't indirection
2021-06-22 23:57:55 Mutabah I guess it's a common misconception...
2021-06-22 23:58:16 SpaceManiac It's in the "Smart Pointers" chapter and given equal billing with Rc and Box, so it's understandable
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2021-06-23 03:27:54 control hello, what is the best way to use cuda on rust?
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2021-06-23 03:29:04 control can't get rustacuda to work properly. any other methods?
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2021-06-23 03:40:14 davros i didn't even know rustcuda was a thing. i thought you had to write seperate compute-shaders
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2021-06-23 05:22:42 Akawama If anybody using ion shell, what's the location for config file, equivalent to .bashrc?
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2021-06-23 05:26:28 bronsen Akawama: this https://gitlab.redox-os.org/redox-os/ion/-/issues/980 mentions ~/.config/ion/initrc
2021-06-23 05:28:05 Akawama bronsen thanks ++
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2021-06-23 05:37:30 w0x12ef what is the meaning of <'a> in func<'a>
2021-06-23 05:37:47 w0x12ef just declaring ?
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2021-06-23 05:38:09 Sobek I'd say yes.
2021-06-23 05:41:14 nox Yes, just like <T>
2021-06-23 05:43:24 w0x12ef nox, so how write it together with T
2021-06-23 05:43:34 nox <'a, T>
2021-06-23 05:43:34 w0x12ef the generic T
2021-06-23 05:43:43 w0x12ef good
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2021-06-23 05:44:09 w0x12ef nox, so why does it need a lifetime declaration
2021-06-23 05:44:18 w0x12ef with function name
2021-06-23 05:44:36 nox To… use the lifetime… in the function signature… just like with a generic T?
2021-06-23 05:45:11 w0x12ef I mean writing 'a at input is enough , I think
2021-06-23 05:45:32 Mutabah define "at input"
2021-06-23 05:46:03 w0x12ef Mutabah, what do you mean
2021-06-23 05:46:22 w0x12ef define is not declaration ?
2021-06-23 05:46:33 Mutabah Can you clarify what you meant by that previous statement (maybe with a code sample of what you think should work)
2021-06-23 05:47:50 osse they meant within the parentheses where the parameters are written
2021-06-23 05:48:50 nox w0x12ef: So how do you cope with a `'a` in a function definition in an impl block which already defines `'a`?
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2021-06-23 05:49:15 nox And why should they be handled differently from `T`?
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2021-06-23 05:50:02 Sobek If you want a different lifetime you call it 'b 'c etc. If it is the same, you use 'a in the signature and it should work. (The compiler is your helpful friend anyways).
2021-06-23 05:51:07 w0x12ef fn print_multi<'a, 'b>(x: &'a i32, y: &'b i32)
2021-06-23 05:51:20 w0x12ef I understand nox says
2021-06-23 05:51:27 w0x12ef nox:make sense
2021-06-23 05:51:39 w0x12ef just like this : x: &'a i32
2021-06-23 05:51:46 nox Sobek: The impl block could be far away from the function you just wrote,
2021-06-23 05:52:02 nox in which case you could miss that you just reused a lifetime from the impl itself,
2021-06-23 05:52:11 nox which may make your unsafe code unsound,
2021-06-23 05:52:13 nox which is bad
2021-06-23 05:53:04 w0x12ef 'a can be recognized as generic type ,as the syntax is the same
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2021-06-23 05:58:38 Bish no it can't, as it has a ' ;)
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2021-06-23 05:58:50 w0x12ef nox:
2021-06-23 05:58:56 w0x12ef Bish, yes
2021-06-23 05:59:27 w0x12ef x: &'a i32 and x:&T
2021-06-23 05:59:31 Bish but i was confused by this at first too
2021-06-23 05:59:38 Bish but it made sense when i saw that static things are static'
2021-06-23 06:00:12 w0x12ef Bish,so what is your consideration
2021-06-23 06:00:23 Bish ? my consideration?
2021-06-23 06:01:08 w0x12ef your opinion
2021-06-23 06:01:36 Bish hm, i never really understood yet what lifetimes are good for, so i can't tell really
2021-06-23 06:01:43 Bish but i think it's odd to "mix" these syntaxes yes
2021-06-23 06:02:01 w0x12ef Bish, <'a, 'b> can be elided ?
2021-06-23 06:02:33 w0x12ef for x: &'a i32, y: &'b i32 already declare them
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2021-06-23 06:03:40 Bish did you need to declare them?
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2021-06-23 06:05:12 w0x12ef of course
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2021-06-23 06:11:11 discipulus w0x12ef: it looks like the lifetime can be elided since there's no return value. The compiler will add them implicitly.
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2021-06-23 06:12:25 w0x12ef discipulus, if no return value ,the lifetime is useless
2021-06-23 06:12:41 nox Lifetimes are parameters, generic types are parameters
2021-06-23 06:13:07 discipulus right, so you don't need to add them explicitly.
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2021-06-23 06:14:36 nox It can be confusing if the parameter already exists in an outer scope, so you do need them.
2021-06-23 06:14:53 nox There was an effort a couple of years ago to make them implicit, but in the end people decided against that
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2021-06-23 06:15:51 discipulus I think I missed something in the conversation then.
2021-06-23 06:18:12 w0x12ef nox:how is the lifetime parameter passed to function
2021-06-23 06:18:33 w0x12ef I mean what is the code like
2021-06-23 06:18:34 discipulus nox: I scrolled up, I didn't notice w0x12ef mention this function being defined in an impl. Actually, this is a function, not a method as there's no self.
2021-06-23 06:19:17 discipulus fn print_multi(x: &i32, y: &i32) will have the lifetime elision rules applied to it.
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2021-06-23 06:19:51 discipulus Even if it was a method, the lifetime elision rules would still be applied, right?
2021-06-23 06:20:42 Sobek However `fn print_multi_ret(x: &i32, y :&i32) -> &i32` will make the compiler unhappy ? (And require explicit annotation of the return lifetime)
2021-06-23 06:20:59 discipulus Sobek: yes
2021-06-23 06:22:05 Sobek Is `fn print_multi_ret(x: &'a i32, y :& i32) -> &'a i32` annotated enough to make rustc happy btw ?
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2021-06-23 06:25:23 nox discipulus: We were talking about *declarations*
2021-06-23 06:25:54 nox Sobek: You need `<'a>`
2021-06-23 06:28:17 discipulus nox: declarations of what?
2021-06-23 06:28:23 nox Lifetimes
2021-06-23 06:28:46 discipulus where?
2021-06-23 06:29:00 nox discipulus: 11:37 <w0x12ef> what is the meaning of <'a> in func<'a>
2021-06-23 06:29:19 nox If you use elision, there is no `'a` at all in the signature, so that's a different topic, AFAICT
2021-06-23 06:30:29 discipulus nox: w0x12ef also asked if the lifetimes can be elided
2021-06-23 06:30:44 nox Ah, I missed that then, my bad
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2021-06-23 06:32:33 w0x12ef <'a> means the lifetime of the function
2021-06-23 06:32:53 w0x12ef &'a is of the inputs
2021-06-23 06:32:58 discipulus nox: no problem. this is helpful to check my understanding too
2021-06-23 06:33:24 w0x12ef so this mean input at least live same long with the function itself
2021-06-23 06:33:28 nox No
2021-06-23 06:33:30 discipulus <'a> is the declaration of the lifetime
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2021-06-23 06:33:54 Bish offtopic: are there people that use redis as their main database?
2021-06-23 06:34:13 Bish i wanted performance so i used it for my first rust project and it's so freaking fast! and i can't see a reason why i wouldn't do that
2021-06-23 06:34:24 Bish (except for joins, not being possible, obviously)
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2021-06-23 06:35:14 discipulus <'a> is the declaration of the lifetime for use later on in the function parameters and return value. It's like a generic type parameter as nox said earlier.
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2021-06-23 06:38:42 w0x12ef does rust have name mangle like c++
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2021-06-23 06:40:44 j`ey w0x12ef: yes
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2021-06-23 06:41:52 w0x12ef j`ey, what is the use of rust name mangling
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2021-06-23 06:42:23 j`ey w0x12ef: having the same name function in different namespaces
2021-06-23 06:42:25 j`ey like C++
2021-06-23 06:42:48 w0x12ef lifetime should be written in the mangled name ?
2021-06-23 06:43:20 j`ey no i dont think so
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2021-06-23 06:57:47 saati lifetime checks are compile time, they don't exist in the binary
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2021-06-23 07:34:11 Midjak Hi, I get something I don't understand in this program: https://gist.github.com/rust-play/ac443ed6a30f91490789a5448c6833c5 . `gstreamer::ElementFactory::find("fakesrc")` return an Option: https://gstreamer.pages.freedesktop.org/gstreamer-rs/stable/latest/docs/gstreamer/struct.ElementFactory.html#returns-14 . If I try to replace unwrap() (l-75) with '?' I get this error: "cannot use the '?' operator in a function that returns ()"
2021-06-23 07:35:15 upb yeah you can use ? when you return Result<>
2021-06-23 07:35:15 j`ey Midjak: your function needs to return an Option
2021-06-23 07:35:45 j`ey Midjak: your function is: fn midjaks_fn() { find("fake")?; }
2021-06-23 07:35:54 Midjak this is the case
2021-06-23 07:35:57 j`ey and ? returns early, by returning None
2021-06-23 07:36:08 Midjak ah ok
2021-06-23 07:36:14 Midjak got it
2021-06-23 07:36:28 j`ey I wish there was a better wording for that error
2021-06-23 07:36:31 j`ey trips up a lot of people
2021-06-23 07:36:49 Midjak yes indeed
2021-06-23 07:37:35 Midjak thank you
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2021-06-23 07:41:29 Midjak the "in" and "on" subtility :-)
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2021-06-23 09:15:28 w0x12ef expected enum `Result`, found enum `Option`
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2021-06-23 09:17:18 j`ey w0x12ef: yes?
2021-06-23 09:17:46 w0x12ef ok,
2021-06-23 09:17:48 w0x12ef while let Some(row) = rows.next()
2021-06-23 09:17:59 w0x12ef sql query operation
2021-06-23 09:18:20 j`ey is the error pointing to that line?
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2021-06-23 09:19:57 w0x12ef yeah
2021-06-23 09:20:35 j`ey is rows an Iterator? what type does 'next' return?
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2021-06-23 09:28:55 w0x12ef this next() expression has type `Result<Option<&rusqlite::Row<'_>>, rusqlite::Error>`
2021-06-23 09:30:03 j`ey ok, so your: while let Some(row) = rows.next(), is wrong
2021-06-23 09:30:07 cehteh shouldnt next() return Option?
2021-06-23 09:30:10 j`ey since Some is an Option, but you have a Result
2021-06-23 09:30:22 j`ey w0x12ef: try: let Ok(Some(row)) = rows.next()
2021-06-23 09:30:47 cehteh if something can go wrong on iteration then Option<Result<>> *maybe* ... still a bit surprising
2021-06-23 09:31:19 j`ey cehteh: take a look at https://docs.rs/fallible-iterator/0.2.0/fallible_iterator/
2021-06-23 09:32:10 cehteh oh .. thanks thats new to me
2021-06-23 09:32:26 w0x12ef j`ey, that's ok ,
2021-06-23 09:32:38 w0x12ef give some explain ?
2021-06-23 09:33:55 j`ey w0x12ef: well as you said, the function returns Result<Option<..>>
2021-06-23 09:34:09 j`ey so you cant use Some(foo) to match it, because you need to match on the result
2021-06-23 09:34:14 j`ey which is Ok/Err
2021-06-23 09:35:13 w0x12ef the Result is not redundant?
2021-06-23 09:35:42 j`ey well the Sql command could fail for some reason
2021-06-23 09:36:06 j`ey I assume? I dont know the library
2021-06-23 09:36:35 w0x12ef it could fail ,yes ,then how can OK match the error result ?
2021-06-23 09:37:07 j`ey Because Result is enum Result { Ok, Err }
2021-06-23 09:37:31 j`ey just like you can match on an option with Some, because enum Option { None, Some }
2021-06-23 09:38:38 w0x12ef cool
2021-06-23 09:39:13 w0x12ef match self.conn.execute(sql_cmd, &[]) {
2021-06-23 09:39:26 w0x12ef ^^^^^^^ cannot infer type for type parameter `T`
2021-06-23 09:39:37 j`ey that's due to the &[] I guess
2021-06-23 09:40:03 j`ey you could try: let foo: &[SomeTypeHere] = &[]; and pass foo instead
2021-06-23 09:40:10 j`ey but I cant tell you what to use for SomeTypeHere
2021-06-23 09:41:11 w0x12ef pub fn execute(&self, sql: &str, params: &[&ToSql]) -> Result<c_int> {
2021-06-23 09:41:20 w0x12ef the signature
2021-06-23 09:43:31 w0x12ef [] is a vec?
2021-06-23 09:43:42 cehteh array
2021-06-23 09:44:01 rk4 w0x12ef: still haven't touched the book eh ;)
2021-06-23 09:44:02 cehteh and &[] is a slice ... caveat they are different
2021-06-23 09:44:04 w0x12ef what is the error meaning
2021-06-23 09:44:12 w0x12ef rk4, on the way
2021-06-23 09:44:41 w0x12ef rk4, I have printed the book
2021-06-23 09:45:09 j`ey w0x12ef: what version of rustsqlite are you using?
2021-06-23 09:45:11 cehteh and with 1.53 we got the IntoIterator for arrays \o/ ... small changes that pleases the eyes
2021-06-23 09:45:31 w0x12ef 0.19.0
2021-06-23 09:45:35 w0x12ef j`ey, ^
2021-06-23 09:45:45 j`ey w0x12ef: any reason to use an old version?
2021-06-23 09:46:37 j`ey also I can't actually find that same signature as you https://docs.rs/rusqlite/0.19.0/rusqlite/struct.Connection.html#method.execute
2021-06-23 09:46:47 w0x12ef rk4, for some syntax ,I just want to confirm it
2021-06-23 09:47:16 * j`ey afk
2021-06-23 09:47:19 w0x12ef j`ey, oops ,
2021-06-23 09:47:57 cehteh hah that takes an iterator not &[] which is cool ... you can leave out the & with recent rust, but still it needs a type
2021-06-23 09:49:08 j`ey does it mean you can only use one type of param? im kinda confused
2021-06-23 09:49:16 cehteh const NO_PARAMS: &[SomeTypeHere] = &[]; << would that work somehow?
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2021-06-23 09:52:27 w0x12ef cehteh, what shoud I give the SomeTypeHere
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2021-06-23 09:52:54 w0x12ef any type?
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2021-06-23 09:53:31 w0x12ef oh,that works
2021-06-23 09:53:38 w0x12ef const NO_PARAMS: &[String] = &[];
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2021-06-23 09:57:17 cehteh actually it want an empty iterator, type doesnt matter, is such a thing in the stdlib? iterator that only returns None for any type
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2021-06-23 09:58:15 j`ey cehteh: yeah but the type would still need to be specified in some way
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2021-06-23 10:00:42 cehteh yes
2021-06-23 10:01:01 cehteh well i am surprised by myself to find an usecase for an empty iterator :D
2021-06-23 10:02:38 cehteh the SomeTypeHere must be something that implements ToSql .. but looking at that, thats a lot :)
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2021-06-23 10:03:09 cehteh including String ..
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2021-06-23 10:04:23 cehteh https://docs.rs/rusqlite/0.19.0/rusqlite/types/struct.Null.html
2021-06-23 10:04:33 w0x12ef_ why does it need to infer type for type parameter `T`
2021-06-23 10:04:38 cehteh hah ..i'd just use NULL for sake of more confusion
2021-06-23 10:05:01 cehteh const NO_PARAMS: &[NULL] = &[]; :)
2021-06-23 10:06:25 cehteh w0x12ef_: rust *always* needs static types, somehow, usually it can infer a lot, but without anything to get a hold on it cant infer it
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2021-06-23 10:07:07 cehteh [] is an empty array .. and there is no indication about "array of what"
2021-06-23 10:07:14 w0x12ef_ Is there concrete reason that it need to infer the type ?
2021-06-23 10:07:20 cehteh which is needed for the typesystem
2021-06-23 10:07:33 w0x12ef_ take this line of code as example
2021-06-23 10:07:35 cehteh yes ... reason is: rust :D
2021-06-23 10:07:57 w0x12ef_ probably not
2021-06-23 10:08:14 w0x12ef_ I guess
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2021-06-23 10:08:28 cehteh because it has a very good and exact type system to ensure that everything is correct, any hole in that as in 'we have something here but dont know what it is' is forbidden
2021-06-23 10:10:26 cehteh it needs at least minimal info how things are typed, doesnt need to be the actual type, just a trait or even a dyn trait, just anything it can use
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2021-06-23 10:12:30 w0x12ef_ well
2021-06-23 10:12:52 w0x12ef_ how can I tell cargo refresh the installed dep libs
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2021-06-23 10:13:12 w0x12ef_ for example .after I update my dep lib's version
2021-06-23 10:14:02 w0x12ef_ vscode still conduct me to the older version types
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2021-06-23 10:14:52 cehteh cargo update?
2021-06-23 10:15:31 cehteh could be vscode that dont get the new stuff? ... no idea i dont use vscode
2021-06-23 10:16:06 w0x12ef_ cehteh, you use vim?
2021-06-23 10:16:18 w0x12ef_ plus rust-analyzer?
2021-06-23 10:16:21 cehteh no
2021-06-23 10:16:28 cehteh the other one :D
2021-06-23 10:16:46 w0x12ef_ oh
2021-06-23 10:17:05 w0x12ef_ that's interesting
2021-06-23 10:17:31 cehteh i am new to rust too .. havent setup everything to my liking yet
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2021-06-23 10:37:35 w0x12ef_ get the answer
2021-06-23 10:37:46 w0x12ef_ cargo clean ;cargo build
2021-06-23 10:39:59 cehteh clean shouldnt be necessary
2021-06-23 10:40:15 w0x12ef_ let row = unwrap_or!(row.ok(), continue);
2021-06-23 10:40:33 w0x12ef_ ok() method not found in `&rusqlite::Row<'_>`
2021-06-23 10:42:06 cehteh first rule in programming: The compiler is always right
2021-06-23 10:42:38 nox Except when served on rocks
2021-06-23 10:43:26 cehteh looking at the docs ... nope Row has no .ok()
2021-06-23 10:43:42 Sobek <nox "Except when served on rocks"> Wut ?
2021-06-23 10:46:33 nox Sobek: Internal Compiler Error -> ICE -> on rocks
2021-06-23 10:46:55 Sobek Got the pun, very clever
2021-06-23 10:47:04 nox Thanks :)
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2021-06-23 10:48:44 Sobek What percentage of rustc bugs are ICE vs output bad code vs error out incorrectly ?
2021-06-23 10:48:46 w0x12ef_ conflict mplementation for `types::to_sql::ToSqlOutput<'_>`
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2021-06-23 10:58:21 nox Sobek: No idea, I was just punning :D
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2021-06-23 10:59:17 Sobek Someone should ask GitHub/Microsoft to do a survey (like their survey about security bulbs still being dominantly memory issues)
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2021-06-23 11:17:59 routeveg Regarding the fun I was having yesterday with find_or_create_session, I found a solution that doesn't use entry!
2021-06-23 11:18:08 routeveg https://play.rust-lang.org/?version=stable&mode=debug&edition=2018&gist=202eac84a1c58e930f49ce12b44b1fd9
2021-06-23 11:18:42 routeveg It's a little obvious perhaps. Looks like it was my insistence of using Option really, that was pushing me into a corner with the borrow checker
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2021-06-23 11:22:43 Alexendoo What's wrong with entry?
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2021-06-23 11:28:04 routeveg Alexendoo: nothing; I just wanted to figure out the simplest way to do it without entry. Using the Option returned from get_mut was causing issues and I really wanted to get to grips with why
2021-06-23 11:28:21 routeveg entry looks like the preferable thing to use from what i've seen..
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2021-06-23 11:39:45 w0x12ef_ why Sized is empty
2021-06-23 11:39:53 w0x12ef_ is it nothing to be sued
2021-06-23 11:39:55 w0x12ef_ used
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2021-06-23 11:43:25 Sobek It is kind of a marker thing to be used by things that care about things having a well defined size. There are stuff that cannot be done with unsized types.
2021-06-23 11:44:20 w0x12ef_ Sobek, size is used to allocating ?
2021-06-23 11:44:53 nox w0x12ef_: Yeah, and other things, you can't pass an unsized thing by value for example
2021-06-23 11:45:04 Sobek ^
2021-06-23 11:45:19 w0x12ef_ nox, what is the default allocator for rust
2021-06-23 11:45:36 nox Used to be jemalloc, but now it's the system's
2021-06-23 11:45:46 Sobek Well defined size at compile time. (In opposition to things that have a dynamic size at run time)
2021-06-23 11:46:26 Sobek You can Box stuff with dynamic sizes, can’t you ?
2021-06-23 11:46:38 nox Yes
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2021-06-23 11:47:04 nox Though from stable Rust, you can only coerce a sized thing to some unsized trait object,
2021-06-23 11:47:17 nox or use libstd functions to go from Vec<T> to Box<[T]>,
2021-06-23 11:47:31 Sobek And in unstable what changes ?
2021-06-23 11:47:35 nox but you can't just make your own unsized box thing
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2021-06-23 11:48:16 Sobek (Meanwhile, unsafe rust can do many shenanigans with pointers 😇)
2021-06-23 11:48:21 nox Sobek: With nightly features you can implement https://doc.rust-lang.org/std/ops/trait.CoerceUnsized.html for your own damn types
2021-06-23 11:48:52 w0x12ef_ what is the exactly meaning of coerce
2021-06-23 11:48:59 w0x12ef_ :D
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2021-06-23 11:52:19 Sobek https://doc.rust-lang.org/nomicon/coercions.html
2021-06-23 11:52:54 Sobek Basically if I give you a reference with a static lifetime and you want to pass it to a function that just require a short lifetime the compiler isn’t going to make a fuss about it :)
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2021-06-23 12:02:23 w0x12ef_ Sobek, of course
2021-06-23 12:02:58 w0x12ef_ compiler feels relaxed
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2021-06-23 12:03:15 nox Also, coercions are things like `Box<String> as Box<dyn Display>`
2021-06-23 12:05:02 w0x12ef_ telling about dyn and derive
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2021-06-23 12:05:19 w0x12ef_ the deeper things
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2021-06-23 12:27:09 w0x12ef_ impl<T: ?Sized> !Sync for *const T {}
2021-06-23 12:27:16 w0x12ef_ what is the use of !sync
2021-06-23 12:30:16 jds that is saying the type explicitly does not/cannot implement Sync, so it's not save to share the reference between threads
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2021-06-23 12:40:44 w0x12ef_ can I take the ownership of a object on the heap
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2021-06-23 12:41:46 ChaiTRex w0x12ef_: Yes, that's generally done through Rc or Box or something like that.
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2021-06-23 12:47:27 w0x12ef_ ChaiTRex, how can I take ownership of string literals
2021-06-23 12:47:49 ChaiTRex w0x12ef_: The best way is str.to_owned()
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2021-06-23 12:48:18 w0x12ef_ here str is a reference ?
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2021-06-23 12:48:25 ChaiTRex Yes, that's right.
2021-06-23 12:48:34 ChaiTRex "hello".to_owned()
2021-06-23 12:48:44 ChaiTRex That will give you a `String`.
2021-06-23 12:49:05 cehteh sometimes i wish that rust had owning references (that is when the reference is dropped then the value gets dropped with it) ... but i am not sure if thats just a brainfart
2021-06-23 12:49:26 cehteh or RefCell ...
2021-06-23 12:50:09 GreenJello sounds like either Rc or owning_ref
2021-06-23 12:51:41 GreenJello RefCell has owning_ref-like support for this with Ref::map
2021-06-23 12:53:00 w0x12ef_ Box return pointer of resource ,this could not be own it ?
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2021-06-23 12:54:49 cehteh yeah most likely a brainfart
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2021-06-23 12:57:32 cehteh mhm does cargo update give a notice when a newer version of a lib is available that doesnt fulfil the version constraint? like foo="0.1" is requested and foo "0.2" is released?
2021-06-23 12:57:52 cehteh how any tool that shows that?
2021-06-23 12:58:05 Arnavion I just have a shell script
2021-06-23 12:58:18 cehteh mind to share that?
2021-06-23 12:58:33 w0x12ef_ why does compiler take string literal as a &str
2021-06-23 12:58:48 cehteh because thats what they are
2021-06-23 12:58:56 cehteh pointer + length
2021-06-23 12:59:00 Arnavion cehteh: https://paste.rs/hMH.sh
2021-06-23 12:59:34 cehteh Arnavion: could be made into a cargo versioncheck or something like that .. tanks
2021-06-23 12:59:49 w0x12ef_ cehteh, so why Box return is not taken as a reference
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2021-06-23 13:00:19 cehteh w0x12ef_: what?
2021-06-23 13:00:58 w0x12ef_ what is the type Box::new return
2021-06-23 13:01:23 cehteh Box<T> ? ...
2021-06-23 13:01:40 cehteh https://doc.rust-lang.org/std/boxed/struct.Box.html
2021-06-23 13:03:31 w0x12ef_ return is also a Box ?
2021-06-23 13:03:56 ChaiTRex w0x12ef_: See the docs on the new function.
2021-06-23 13:04:29 ChaiTRex https://doc.rust-lang.org/std/boxed/struct.Box.html#method.new
2021-06-23 13:05:25 w0x12ef_ see that
2021-06-23 13:05:49 cehteh w0x12ef_: when you call Something::new() then you usually expect it to return a new of Something
2021-06-23 13:06:17 cehteh maybe Result
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2021-06-23 13:07:06 w0x12ef_ then how to use the returned value
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2021-06-23 13:07:34 ChaiTRex w0x12ef_: It works a lot like the value you passed into Box::new.
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2021-06-23 13:07:42 ChaiTRex w0x12ef_: So you can call methods on it, etc.
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2021-06-23 13:09:01 w0x12ef_ who owns the returned value
2021-06-23 13:09:13 j`ey the caller
2021-06-23 13:09:27 cehteh Arnavion: put that under 'cargo-outdated' .. next step color the lines and/or put a note 'NEW!' in a 4th column
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2021-06-23 13:09:49 cehteh w0x12ef_: Box implements Deref
2021-06-23 13:10:46 cehteh so a Box<Foo> can be used as if it is a Foo
2021-06-23 13:10:48 Arnavion cehteh: I wanted to do that, but I couldn't be bothered to implement semver in bash
2021-06-23 13:11:37 cehteh Arnavion: haha maybe i give it a try, i dont know jq well, wondering if that could be already implemented in jq's query language
2021-06-23 13:11:47 Arnavion I don't think so
2021-06-23 13:12:03 cehteh Arnavion: i have some smething similar in my crontab to do kernel updates
2021-06-23 13:12:46 cehteh https://gist.github.com/cehteh/79a38638716a91e124d4d64aec5105b0
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2021-06-23 13:13:19 cehteh not 100% semver just a hack, but works
2021-06-23 13:14:55 cehteh https://github.com/cloudflare/semver_bash
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2021-06-23 13:21:04 dcz if anyone wants a crate tested/benched on risc-v (stable-riscv64gc-unknown-linux-gnu), I'm happy to help
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2021-06-23 13:22:48 gtlsgamr I have been wanting to get into learning a lower level language since a long time. I had a choice between C and Rust. I went with Rust. I hope my choice was correct.]
2021-06-23 13:25:08 [code] either one will teach you more about how a computer works
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2021-06-23 13:29:06 Gottox Hey! A question about rust: Due to the fact that I cannot add foreign traits to foreign structs I'd like to implement my own struct which just has the same fields as the struct for a library. Is there a way to copy these data from one struct to another?
2021-06-23 13:29:32 j`ey and you cant use a newtype?
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2021-06-23 13:31:25 Gottox j`ey: unfortunately no, as the type is later used to construct a http request within the library.
2021-06-23 13:31:58 Gottox I simple workaround would be to use serde to serialize the data to json and deserialize it to the new type, but that sounds awful.
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2021-06-23 13:32:01 j`ey dunno why that matters?
2021-06-23 13:33:09 Gottox well, to give the real example: I want to use the kube crate to export resources from third party libraries as kubernetes resource.
2021-06-23 13:33:53 Gottox I cannot add the needed traits from the kube trait as the types are defined in the third party crate.
2021-06-23 13:34:04 Gottox -kube trait+kube-crate
2021-06-23 13:34:37 Arnavion And what prevents you from making a newtype?
2021-06-23 13:35:16 Gottox the issue is, that kube implements traits for the contained types too.
2021-06-23 13:35:25 Gottox At least it looks like it.
2021-06-23 13:35:48 Arnavion Give specifics
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2021-06-23 13:37:02 dcz Gottox: if you want to copy the data, you have to implement From<Foreign> for YourStruct
2021-06-23 13:37:24 dcz you may be out of luck if some fields are hidden though
2021-06-23 13:38:07 dcz regardless, l too recommend trying to make newtype work
2021-06-23 13:38:44 Gottox newtype doesn't work unfortunately, let me setup a play for that.
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2021-06-23 13:43:01 Gottox https://gist.github.com/Gottox/2b4784410625c2564b8c37a51abb46ef
2021-06-23 13:43:28 Gottox for now I just added 'static as a lifetime, FooSpec<'a> is not accepted here.
2021-06-23 13:44:28 dcz you need to implement the trait yourself, not derive it
2021-06-23 13:44:30 Arnavion struct RealmRepresentationWithSchema(RealmRepresentation<'static>); impl JsonSchema for RealmRepresentationWithSchema { ... }
2021-06-23 13:44:49 Gottox that's right... 🤔
2021-06-23 13:45:11 Gottox I assumed FooSpec was already my newtype...
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2021-06-23 13:45:29 dcz it's effectively the same as newtype
2021-06-23 13:45:45 Arnavion You can impl JsonSchema for FooSpec, sure. The point is you have to impl it manually
2021-06-23 13:45:46 dcz the newtype syntax is just slightly different, what Arnavion wrote
2021-06-23 13:46:17 Gottox okay, thanks for unravel that for me! <3
2021-06-23 13:46:30 Gottox rust helpful as always, thank you!
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2021-06-23 14:09:58 maurer Is there a way to get `./x.py` to build `std` with `panic=abort`? I can do it manually, but not in the compiler build context
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2021-06-23 14:23:26 routeveg So far I am having a good time with rust!
2021-06-23 14:23:52 routeveg Though I think it is fair to say that one of the reasons for the safety of the resulting programs, is how much pain comes out of trying to reimplement basic data structures yourself.
2021-06-23 14:24:01 routeveg It's really a stick, as much as it is a carrot :P
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2021-06-23 14:33:46 Arnavion maurer: It can be done with cargo build -Z build-std . For ./x.py I don't see anything in config.toml so I guess you'd have to set RUSTFLAGS
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2021-06-23 14:36:58 maurer OK. I don't *think* -Z build-std works for this since I'm editing std, so I'll just set RUSTFLAGS
2021-06-23 14:37:44 dcz what is x.py?
2021-06-23 14:37:58 j`ey dcz: build system for rust
2021-06-23 14:38:00 j`ey *rustc
2021-06-23 14:38:27 dcz is it the canonical way to build libstd? I thought xargo used something else
2021-06-23 14:38:56 j`ey xargo doesnt use x.py no
2021-06-23 14:39:04 j`ey but xargo is unmaintained now anyway
2021-06-23 14:39:26 Arnavion maurer: -Z build-std uses whatever it finds for the rust-src component
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2021-06-23 14:40:46 dcz is x.py also the way to build libcore for cross-compiling?
2021-06-23 14:40:59 j`ey no, -Z build-std is
2021-06-23 14:41:09 Arnavion maurer: So as a hack you can edit that and get your changes that way
2021-06-23 14:41:13 dcz thanks j`ey
2021-06-23 14:42:10 j`ey dcz: you only probably need x.py if you want to build rustc itself
2021-06-23 14:42:53 dcz probably not, last time I got stuck on getting a matching libcore for the rustc I had from the distro
2021-06-23 14:43:08 maurer Arnavion: Yeah, I think rustflags is probably better for now. (It turns out that panic-unwind and its dependencies use infallible allocation, so I can't figure out what parts of `std` do as long as I'm linking against it, since it will keep infallible alloc on)
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2021-06-23 14:45:40 maurer (Currently my rust-src component points to an immutable directory, so that would be painful to work around)
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2021-06-23 14:49:58 maurer Hrm. Adding `-C panic=abort` still ends up building `panic_unwind`, which flips the feature flags the way I don't want.
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2021-06-23 14:50:24 maurer I guess I'll look into `-Z build-std` for testing this out
2021-06-23 14:50:53 Arnavion With -Z build-std you have to set a feature to make it use abort instead of unwind
2021-06-23 14:51:04 Arnavion Let me see if I had what I used in shell history somewhere...
2021-06-23 14:52:51 maurer I guess the other option is that since this is for dev, I can just... punch out panic_unwind and replace it with an immediate_abort equivalent
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2021-06-23 14:56:17 Arnavion I don't have it any more, but I think it was -Z build-std=panic_abort,std -Z build-std-features=
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2021-06-23 14:56:51 Arnavion Or possibly -Z build-std=panic_abort,std -Z build-std-features=panic_immediate_abort based on what web search tells me because it does sound familiar
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2021-06-23 14:58:31 maurer OK, I'll give it a shot. I'll need to learn about build-std eventually
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2021-06-23 15:14:58 cehteh meh.. why do i step on on a stdlib bug :D
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2021-06-23 15:20:27 tsdh Is there some crate dealing with custom format strings? I want to define something like foo_format = "{id} - {title}" in a toml file, load it, and then replace id, title, and other placeholders.
2021-06-23 15:24:24 Arnavion format!(include_str!("foo-format.txt", id = ..., title = ...))
2021-06-23 15:24:44 Arnavion Downside is you'll have to maintain a separate file for every template
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2021-06-23 15:24:55 j`ey and you cant load that at runtime
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2021-06-23 15:25:50 cehteh there are some things planned for that, moving target currently
2021-06-23 15:26:28 j`ey cehteh: runtime formatting?
2021-06-23 15:27:13 cehteh yeah
2021-06-23 15:28:02 j`ey i didnt know that
2021-06-23 15:28:06 tsdh Yeah, I need that at runtime.
2021-06-23 15:28:23 Arnavion Then the include_str! method won't help
2021-06-23 15:28:45 Arnavion I remember there was a strfmt crate but I see it hasn't been updated since 2018. Not sure what else is there
2021-06-23 15:28:54 Arnavion As a last resort there's always libc::printf
2021-06-23 15:29:58 cehteh lol
2021-06-23 15:30:22 cehteh actually you may define a serde thingy for fancy stuff too
2021-06-23 15:30:36 Lumpio- Or for simple case just like .replace("{id}", id)
2021-06-23 15:30:42 cehteh yes
2021-06-23 15:31:06 tsdh Lumpio-: Yeah, I think I'll use that for the time being.
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2021-06-23 15:33:08 cehteh i made a string-substitution language for my doc processor in lua, eventually i want to port that to rust
2021-06-23 15:33:56 cehteh the ultimate macro language, but like liisp, but using {} and works on strings only
2021-06-23 15:38:49 cehteh https://rust-lang.github.io/rfcs/2795-format-args-implicit-identifiers.html
2021-06-23 15:39:37 cehteh and slightly related: https://blog.rust-lang.org/2021/05/11/edition-2021.html#reserving-syntax
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2021-06-23 15:39:50 Arnavion tsdh: Just be careful that the replacements don't themselves contain strings that can be confused with templates. Eg don't repeat the mistake of XML unescaping that changes &amp;lt; to < instead of &lt;
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2021-06-23 16:02:17 tsdh Arnavion: Yes, I'm formatting WM windows so I guess when replacing in the order id, app_name, title nothing bad can happen. But I'll add a "TODO: use proper format strings once landed" for my future me. ;-)
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2021-06-23 18:50:42 kline hello, im trying to match a struct with a specific value and im not sure how to massage the value from a literal into whats expected: https://gist.github.com/AbstractBeliefs/bbb8a3eec13fc3040c0f5aaea0d348bb
2021-06-23 18:50:49 kline id love advice on how to correct this
2021-06-23 18:53:55 j`ey you could String::from("249"), but that allocates
2021-06-23 18:54:08 ChaiTRex kline: Command::Raw(x, params) if x == "249" =>
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2021-06-23 18:54:18 j`ey so you could try: Command::Raw(number_string, params) if number_string == "249" => {..
2021-06-23 18:54:26 kline oh cool, you can do erlang style guards
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2021-06-23 18:55:08 ChaiTRex Though if raws are all numeric, you might switch to u16 or something.
2021-06-23 18:55:28 kline its unclear to me why upstream does this
2021-06-23 18:56:13 kline i imagine just because raws are already the crate saying "i dont know how to parse this, best of luck", and could conceivably include a new named command not otherwise recognised
2021-06-23 18:56:20 CodeSpelunker any familiar faces from the Rust discord? :O
2021-06-23 18:56:21 kline an example could be WEBIRC
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2021-06-23 19:17:41 davros how many people here use the rust discord (i do )
2021-06-23 19:18:01 maurer I've tried using it before, but nobody has ever answered one of my questions on there
2021-06-23 19:18:09 maurer it seems more focused on basic usage questions
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2021-06-23 19:23:38 cehteh which one?
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2021-06-23 19:27:24 davros is it possible to express 'strided data' via the DST mechanism
2021-06-23 19:27:50 davros eg lets say you have an array x0,y0,z0, x1,y1,z1, ...
2021-06-23 19:28:30 davros "a strided array of x's " = &x , stride = sizeof_val(x0)*3 , length = ..
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2021-06-23 19:46:01 SpaceManiac davros: not built-in, so it won't be named &T, but crates like ndarray do have such slice types
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2021-06-23 20:38:47 raekye Hi, with BTreeMap I'm trying to implement something like "get or insert" - I'm aware of .entry(...).or_insert(...) but .entry takes a key by value
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2021-06-23 20:39:41 raekye I want to pass a key by reference and only clone it if an insert is actually needed (internally needing to do the lookup twice is fine - as far as I understand doing this with 1 lookup isn't possible with BTreeMap)
2021-06-23 20:40:12 raekye Here's a naive implementation: https://play.rust-lang.org/?version=stable&mode=debug&edition=2018&gist=8e56480c619be3a3c03083f25c4ed18e
2021-06-23 20:41:54 raekye I don't really understand why the borrow checker is unhappy
2021-06-23 20:41:59 Mutabah It's a borrow checker limitation, it doesn't know that the borrow ceases to exist in the `None` arm
2021-06-23 20:42:23 raekye I see, is there a way to rewrite it so it knows?
2021-06-23 20:43:06 Mutabah No :( - An early return is more likely to work, but that trips another borrow checker limitation
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2021-06-23 20:43:38 raekye ok, it is what it is :P Thank you!
2021-06-23 20:43:41 Mutabah However - This is a relatively easily checked bit of unsafe code
2021-06-23 20:44:18 Mutabah (A reborrow via `*const i32` will break the lifetime path)
2021-06-23 20:44:32 Mutabah https://gist.github.com/rust-play/6b7aa503716a0d993a23a2a6b6e89d75
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2021-06-23 21:09:15 w0x12ef_ what is the implicit meaning to write the type after name, a:int32
2021-06-23 21:09:26 w0x12ef_ int32 a
2021-06-23 21:09:43 ChaiTRex w0x12ef_: It means that a has type i32.
2021-06-23 21:09:49 ChaiTRex You're telling what the type is.
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2021-06-23 21:10:26 w0x12ef_ I kwon
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2021-06-23 21:25:48 danieldg w0x12ef_: the reason is to focus on the name, not the type
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2021-06-23 21:28:57 w0x12ef_ danieldg, name is random,not important
2021-06-23 21:28:57 Mutabah w0x12ef_: Serously, read the book (read the online version, at least give it a skim)
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2021-06-23 21:29:37 * rk4 smiles
2021-06-23 21:29:44 w0x12ef_ I does no mean the syntax
2021-06-23 21:29:47 w0x12ef_ not
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2021-06-23 21:31:38 danieldg if you name all your variables randomly, people will think you are a javascript programmer
2021-06-23 21:32:55 discipulus w0x12ef_ I don't understand the question
2021-06-23 21:35:48 discipulus I think you might be asking why the language designers chose to use that syntax, is that right?
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2021-06-23 21:43:23 w0x12ef_ yep
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2021-06-23 21:53:14 rk4 python devs, too
2021-06-23 21:53:20 discipulus I can only guess. I don't remember the book telling me the reason for the syntax. My guess is that it's related to notation in mathematics or logic.
2021-06-23 21:54:19 rk4 like, it's almost identical, python example: `def f(s: str) -> str'
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2021-06-23 21:59:35 discipulus One way to say `a: i32` is "a is an instance of i32". For generic type bounds `T: Display` "T is a subtype of Display". For lifetime parameters `'b: 'a` is "'b outlives 'a"
2021-06-23 22:01:46 discipulus My guess is that it is written in the same order as you would say it.
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2021-06-23 22:04:21 meltyness i'm kinda coming in, in the middle of this, but those typing annotations are all metadata in my opinion
2021-06-23 22:04:34 meltyness But I mean colon, in english, usually means ":" defined as
2021-06-23 22:05:00 meltyness but so far you only have to annotate types if the compiler cannot infer it
2021-06-23 22:05:12 danieldg or in function parameters :D
2021-06-23 22:05:28 meltyness well of course it couldn't infer your own definition!
2021-06-23 22:06:02 discipulus There must be an RFC for this. How do I look it up?
2021-06-23 22:06:15 meltyness but like for a header like, fn barf(&str : s) -> str
2021-06-23 22:06:47 meltyness "We define a function, named barf, which accepts a reference to a string slice named s, and returns a string slice.
2021-06-23 22:07:03 meltyness ...or an owned string slice, idk rust is hard
2021-06-23 22:07:17 Mutabah I believe the reasoning is that it both simpifies the parser, and (slightly) simplifies reading
2021-06-23 22:07:38 Mutabah For reading, you get the variable name (the "key") first, then the type of it
2021-06-23 22:07:59 Mutabah and for parsing, the `:` acts as a unique separator between the pattern and type
2021-06-23 22:08:16 meltyness "I have three sisters: Daphne, Rose, and Suzanne." -- wikipedia
2021-06-23 22:09:28 rk4 meltyness: must is a strong word :P, a RFC process often emerges after the essence of a thing has already been created. after all, who wants step one in making their new language to be a long series of RFCs!
2021-06-23 22:10:08 rk4 [there might be one, i haven't looked]
2021-06-23 22:10:26 discipulus good catch
2021-06-23 22:10:55 meltyness and who wants a language that's stuffed with keywords representing every pissing type anyone would ever want
2021-06-23 22:11:16 meltyness good pissing luck -- sincerely godel
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2021-06-23 22:19:53 w0x12ef_ the name is not important as its type
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2021-06-23 22:29:36 discipulus w0x12ef_ your saying the type should be written first because it has more importance, right?
2021-06-23 22:29:49 w0x12ef_ no
2021-06-23 22:30:00 discipulus oh
2021-06-23 22:30:18 danieldg w0x12ef_: the name is more important than the type
2021-06-23 22:30:26 w0x12ef_ oh
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2021-06-23 22:36:41 w0x12ef_ compiler front:back
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2021-06-23 22:49:18 discipulus TIL there's a rust language design forum https://internals.rust-lang.org/c/language-design/21
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2021-06-24 04:20:04 w0x12ef ping
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2021-06-24 04:32:48 trev pong
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2021-06-24 04:53:24 sensille i just had a very nasty battle with the borrow checker. the borrow was coupled to a reference to my own struct. i tried to solve it with a clone(), but that didn't change the error message a single bit
2021-06-24 04:53:51 sensille turned out that i hadn't derived Clone for my struct. after deriving it everything was fine
2021-06-24 04:54:34 sensille i would have at least expected the compiler to complain that i haven't implemented clone for my struct
2021-06-24 04:54:50 j`ey but you were probably calling it on &T
2021-06-24 04:54:51 sensille but apparantly it just cloned the reference instead?
2021-06-24 04:54:53 j`ey and &T impls clone
2021-06-24 04:54:54 j`ey yeah
2021-06-24 04:55:17 sensille but implementing clone on the struct changes that?
2021-06-24 04:55:35 j`ey yeah because then it picks the T: Clone
2021-06-24 04:55:44 sensille that's ... nasty
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2021-06-24 04:56:50 sensille it took me quite long to figure that out, but i don't know how the compiler could have helped me more here
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2021-06-24 05:29:18 trev i wish there was something to convert an entire crate from async to sync
2021-06-24 05:31:16 w0x12ef Internal references as a separate type,is ok?
2021-06-24 05:31:55 j`ey i dont understand the question
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2021-06-24 05:37:16 w0x12ef reference as a type
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2021-06-24 05:38:11 w0x12ef which can be inspected
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2021-06-24 05:45:16 jbg trev: it's quite easy to write sync wrappers for async crates (e.g see reqwest) and I imagine you could probably generate that code
2021-06-24 05:45:30 jbg w0x12ef: what do you mean by "inspected"?
2021-06-24 05:45:35 jbg T and &T are indeed different types
2021-06-24 05:46:01 w0x12ef jbg, reflect
2021-06-24 05:46:09 j`ey rust doesnt have reflection
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2021-06-24 05:46:37 w0x12ef why not
2021-06-24 05:47:01 bertptrs it's not been implemented. there's no fundamental reason it couldn't exist in the future
2021-06-24 05:47:44 jbg if there was reflection, naturally it would reflect the reality that T and &T are not the same type
2021-06-24 05:47:59 bertptrs reflection isn't as useful in languages like C++ and Rust as it is in Java or Python, for example
2021-06-24 05:48:02 jbg thankfully you can mostly do your reasoning about types at compile time though
2021-06-24 05:48:09 jbg so yeah ^
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2021-06-24 05:54:24 trev jbg i can't compile any async crates on the target i'm using :[
2021-06-24 05:54:37 jbg aw
2021-06-24 05:55:17 trev it's killing me
2021-06-24 05:55:30 jbg which target?
2021-06-24 05:55:54 trev intel sgx
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2021-06-24 06:02:15 w0x12ef the book , where can I find a type have impl what traits
2021-06-24 06:02:58 j`ey w0x12ef: in the documentation
2021-06-24 06:03:01 bertptrs not in the book, but in the documentation
2021-06-24 06:03:10 bertptrs that list would be way too long and impractical for the book
2021-06-24 06:03:13 j`ey for example https://doc.rust-lang.org/std/vec/struct.Vec.html#trait-implementations
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2021-06-24 06:05:26 w0x12ef oh,I see it
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2021-06-24 06:10:06 w0x12ef what is Auto Trait Implementations and Blanket Implementations
2021-06-24 06:11:51 j`ey Auto traits, are ones the compiler has generated
2021-06-24 06:12:14 Lumpio- And blanked implementations are when you implement a trait for a generic argument
2021-06-24 06:12:16 Lumpio- blanket*
2021-06-24 06:12:22 Lumpio- Like "impl<T> Trait for T" and such
2021-06-24 06:12:36 Lumpio- You can't add new auto traits yourself and they're mostly markers like Send and Sync etc that the compiler can autodeduce.
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2021-06-24 06:26:20 discipulus https://doc.rust-lang.org/std/primitive.reference.html#trait-implementations-1
2021-06-24 06:26:47 discipulus for references: "Clone (Note that this will not defer to T’s Clone implementation if it exists!)"
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2021-06-24 06:29:57 discipulus what does it mean?
2021-06-24 06:31:24 bertptrs That means that if you call &t.clone(), you'll get an &t, and not a new t
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2021-06-24 06:31:32 jbg (&t).clone()
2021-06-24 06:32:47 discipulus (&t as Clone)::clone(&&t) ??
2021-06-24 06:33:42 jbg basically yes
2021-06-24 06:34:15 jbg in other words, if you clone a reference, you get another reference
2021-06-24 06:35:05 jbg but generally you call T's clone() instead so it doesn't come up that much
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2021-06-24 06:36:42 discipulus I think TRPL meantioned &T implements Copy. I don't remember it mentioning it implementing Clone. Glad I caught this discussion :)
2021-06-24 06:37:17 j`ey discipulus: Copy: Clone
2021-06-24 06:37:26 jbg everything that impls Copy impls Clone
2021-06-24 06:37:29 j`ey everything that is Copy, is also Clone
2021-06-24 06:37:55 jbg also, copying references is very common, deliberately cloning them not so much
2021-06-24 06:38:20 discipulus Yes, it makes sense to think of them being copy
2021-06-24 06:38:27 jbg it mostly comes up with things like Option<&T> where cloning the option gives you another Option<&T> which can be a surprise the first time you encounter it
2021-06-24 06:38:41 j`ey sensille had this exact issue a few hours ago
2021-06-24 06:38:43 jbg but really makes perfect sense
2021-06-24 06:38:56 discipulus Yes, I that's the discussion I read
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2021-06-24 06:39:07 jbg and Option has .cloned() for Option<&T> -> Option<T>
2021-06-24 06:39:08 j`ey ah
2021-06-24 06:40:16 discipulus I hadn't committed Copy: Clone to memory. I don't think I'll forget again. thank you
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2021-06-24 06:46:48 w0x12ef defer
2021-06-24 06:46:51 w0x12ef pub trait Copy: Clone { }
2021-06-24 06:47:09 bertptrs yes?
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2021-06-24 06:51:18 discipulus Does "will not defer" mean that (&t).clone() implementation will not "call" T.clone()? Or that the compiler's method call lookup will not resolve to (t).clone()?
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2021-06-24 06:52:00 j`ey latter
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2021-06-24 06:52:16 w0x12ef A simple bitwise copy of String values would merely copy the pointer, leading to a double free down the line. For this reason, String is Clone but not Copy.
2021-06-24 06:52:32 w0x12ef from the book
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2021-06-24 06:52:49 j`ey yep
2021-06-24 06:53:08 j`ey since a String is a pointer to heap allocated memory
2021-06-24 06:53:20 j`ey that drops/frees the memory automatically
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2021-06-24 06:55:42 w0x12ef Is there a trait of Drop ,which describe how the resource should be freed
2021-06-24 06:55:46 j`ey yes
2021-06-24 06:56:22 w0x12ef I cannot find this in the book :(
2021-06-24 06:56:23 Sobek That’s the very name if the trait actually :D
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2021-06-24 06:57:06 j`ey w0x12ef: https://doc.rust-lang.org/book/ch15-03-drop.html
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2021-06-24 06:57:41 bertptrs Drop is a bit magical
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2021-06-24 06:59:30 w0x12ef where is the drop impl for String
2021-06-24 07:00:08 bertptrs It doesn't implement it directly, String wraps Vec<u8>, which does
2021-06-24 07:00:46 mrmonday bertptrs: hey, mind if I PM you?
2021-06-24 07:01:11 bertptrs mrmonday: not at all
2021-06-24 07:02:36 w0x12ef oh,yep
2021-06-24 07:02:54 w0x12ef rust is clever
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2021-06-24 07:42:26 gtlsgamr Rusteaceans :(
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2021-06-24 09:09:29 peterandre hi, i have written the following -> https://gist.github.com/rust-play/335c3e1f62a8e21ba0acc147237ccb45 I get -> expected `str`, found `&[u8; 440]` How can i bypass this ?
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2021-06-24 09:11:37 j`ey peterandre: this doesnt look.. right
2021-06-24 09:11:43 nitrix include_bytes! gives you the content of a file, which you're passing to PathBuf which wants a path.
2021-06-24 09:11:44 Lumpio- peterandre: include_bytes reads and includes the actual bytes of the file into your program
2021-06-24 09:11:49 Lumpio- Therefore trying to get a path for it makes no sense
2021-06-24 09:12:20 peterandre i see
2021-06-24 09:12:53 j`ey (we've already told you that include_bytes!() is including the file directly, it doesnt include it like a 'File' that you can use)
2021-06-24 09:12:57 Lumpio- So I guess the question is do you want to include the zip file inside your executable or open a separate file via a path
2021-06-24 09:13:20 peterandre the first lumpio
2021-06-24 09:13:46 j`ey if zip_extract_file_to_memory needs to take a path, you cant do it with include_bytes!()
2021-06-24 09:13:53 j`ey unless you write it out to a temporary file
2021-06-24 09:14:06 peterandre ill try that
2021-06-24 09:14:07 peterandre thanks
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2021-06-24 09:15:12 kee peterandre: alternatively https://crates.io/crates/vfs-zip might be useful
2021-06-24 09:15:34 Lumpio- I think you'll want to skip that zip-extensions crate or whatever it was that provices zip_extract_file_to_memory
2021-06-24 09:15:48 Lumpio- I don't think you should need a temporary file for this tbh
2021-06-24 09:16:13 Alexendoo The regular zip crate can take any old reader as an input
2021-06-24 09:16:23 peterandre ok thanks guys
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2021-06-24 10:38:18 w0x12ef what is the channel talking on blockchain and ethereum
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2021-06-24 10:38:31 cehteh mhm how bad/malpractice is it to have default implementations in a trait {unimplemented!()} ... aka have some methods optional
2021-06-24 10:39:08 j`ey cehteh: another option is to make them not-default, but provide some helper functions that the people implementing the trait can call
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2021-06-24 10:42:01 cehteh its a bit corner case here, i am using TempDir which will clean the dir when going out of scope
2021-06-24 10:42:45 cehteh but this is in a testsuite for a fuse filesystem, so i need to hook some extra drop implementaition in that would unmount the fuse filesystem there
2021-06-24 10:43:47 j`ey can you add those methods to the trait, under a feature/cfg(test)?
2021-06-24 10:43:59 cehteh thinking about trait TestDir ... and for the the test where no mounting is done one can just implement it for TempDir, while when unmounting is needed a wrapper that implements an extra drop will be used
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2021-06-24 10:44:25 cehteh nah eventually i want ot factor this out into its own test lib
2021-06-24 10:45:31 cehteh so more generic dyn TestDir .. where one can hook in all kinds of stuff, fixture creation, copying things from templates, just be generic
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2021-06-24 10:46:11 cehteh methinks panicing on a unimplemented in a test suite isnt considered harmful
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2021-06-24 10:47:17 trev w0x12ef blockchain sux
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2021-06-24 10:47:57 cehteh w0x12ef: do *not* try ##crypto :D
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2021-06-24 11:01:10 raekye If I have an Option<&mut Foo>, (how) can I convert it to Option<&Foo>?
2021-06-24 11:02:44 j`ey b.map(|b|&*b).. seems kinda weird
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2021-06-24 11:06:31 raekye mmm not the most elegant but it works, thanks!
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2021-06-24 11:13:20 Reventlov Hey
2021-06-24 11:13:40 Reventlov I'm trying to parse a date to a naive datetime, e.g. 2021-06-03 13:11:41.251156
2021-06-24 11:14:09 Reventlov Right now I do a let mut timestamp = NaiveDateTime::parse_from_str(splitted[0], "%Y-%m-%d %H:%M:%S.%f");, but I get some shift in the results
2021-06-24 11:14:34 Reventlov e.g. Ok(2021-06-03T13:11:41.000251156) (note the three 000 on the subsecond part)
2021-06-24 11:14:44 Reventlov Am I doing something wrong ?
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2021-06-24 11:19:21 Reventlov https://play.rust-lang.org/?version=stable&mode=debug&edition=2018&gist=7a3370f4e2dde5c651a024734ce453ed
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2021-06-24 11:19:52 osse Reventlov: try %.6f instead of %f
2021-06-24 11:19:54 Alexendoo Reventlov: %f will zero pad to 9 digits https://docs.rs/chrono/0.4.19/chrono/format/strftime/index.html#fn6
2021-06-24 11:20:05 bertptrs small typo, it should be %.f, not .%f
2021-06-24 11:20:26 jbg .%f because it's literally preceded by a dot (period)
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2021-06-24 11:20:39 jbg IOW %f is parsing nanoseconds but you have microseconds
2021-06-24 11:20:42 bertptrs jbg: this is literally from the documentation
2021-06-24 11:21:13 jbg you're right that he wants %.f, but it's not a typo, he also needs the dot beforehand
2021-06-24 11:21:24 bertptrs not according to the docs
2021-06-24 11:21:25 jbg otherwise it won't parse because there is a dot in the input
2021-06-24 11:21:29 bertptrs https://docs.rs/chrono/0.4.19/chrono/naive/struct.NaiveDateTime.html#method.parse_from_str
2021-06-24 11:21:58 jbg oh interesting, the format includes the dot?
2021-06-24 11:22:03 jbg how is it parsing at all right now then?
2021-06-24 11:23:10 bertptrs incorrectly, clearly
2021-06-24 11:23:35 jbg I meant why is it not tripping up on the `.` in the format string which would have already chomped the . from the input
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2021-06-24 11:23:42 jbg and then %.f expects a dot apparently
2021-06-24 11:23:49 jbg but actually it looks like %f does not include the dot
2021-06-24 11:23:55 jbg and %.f, %.6f and so on do
2021-06-24 11:23:56 bertptrs https://docs.rs/chrono/0.4.19/chrono/format/strftime/index.html. If you don't specify the dot, it's a different pattern and the number is taken as nanoseconds
2021-06-24 11:24:09 jbg so that answers that
2021-06-24 11:24:09 Reventlov damn
2021-06-24 11:24:11 Reventlov thanks
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2021-06-24 11:24:42 jbg I guess this stuff is weird because of weird historical glibc stuff or something
2021-06-24 11:24:52 jbg and a desire to maintain compatibility with existing format strings
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2021-06-24 11:25:13 bertptrs people have memorized those weird strings already, no need to make them memorize something else
2021-06-24 11:26:17 Reventlov bertptrs: well on python, it actually works :p
2021-06-24 11:26:45 bertptrs python is a magical world where things work without a good reason for them to
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2021-06-24 11:27:08 Reventlov which is why I got bitten
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2021-06-24 11:37:48 bertptrs btw if you use the standard iso format like you do, the FromStr implementation does that so you could just use str.parse()
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2021-06-24 11:52:50 mrmonday looks like we lost a whole bunch of folk to ##rust-unidentified after that netsplit
2021-06-24 11:52:52 mrmonday oopsie
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2021-06-24 11:54:48 cehteh this redirection sux, just remove the +r and add the mode that prevents anyone unidentified from speakin is enough and much more friendly to legitimate users
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2021-06-24 12:11:30 mrmonday it was added because of spam, not sure whether it's the best idea to keep it or not
2021-06-24 12:11:52 mrmonday and it's easy to miss that you're quietted if you're in the channel
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2021-06-24 12:14:07 cehteh spam can be prevented with the 'only identified users can talk' flag already
2021-06-24 12:14:24 --> whoami (~whoami@d118-75-122-76.col.wideopenwest.com) has joined ##rust
2021-06-24 12:14:30 mrmonday yes, but if you're a legitimate user and not identified it's not always obvious that your message hasn't got through
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2021-06-24 12:14:36 nCrazed does the redirect happen if you split when using SASL?
2021-06-24 12:14:58 cehteh you get a message that you cant talk
2021-06-24 12:15:20 cehteh we are doing that in other channels
2021-06-24 12:15:52 mrmonday highly client dependent whether you see that or not, a bunch of them put that message somewhere other than the channel
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2021-06-24 12:17:01 mrmonday the unidentified channel has a bot which periodically sends notices about it
2021-06-24 12:17:21 mrmonday nCrazed: if you're identified you don't get redirected
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2021-06-24 12:18:01 demize cehteh: Not all spam happens in-channel however, there are plenty of spam bots that join channels to get targets for PM spam.
2021-06-24 12:18:52 cehteh but thats unrelated to the channel .. people are responsible for themself (and usually ircops will kill those spamers)
2021-06-24 12:19:05 mrmonday also you can set usermode +Q I believe if you don't want to be forwarded... though if you're savvy enough to know that you probably also have an account so it won't affect you :P
2021-06-24 12:19:22 cehteh you are just overblocking here, in other channels it just works without the -r flag
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2021-06-24 12:19:59 cehteh i havnt properly configured my bouncer yet, so i regulary fall of and notice this inconvinience
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2021-06-24 12:20:39 cehteh and i am just think its really user unfriendly
2021-06-24 12:20:45 -- Mode ##rust [+o mrmonday] by ChanServ
2021-06-24 12:20:48 -- Mode ##rust [-r] by mrmonday
2021-06-24 12:20:51 -- Mode ##rust [-o mrmonday] by mrmonday
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2021-06-24 12:21:20 cehteh thanks
2021-06-24 12:21:20 mrmonday might add it back, will see how it goes without
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2021-06-24 12:21:32 twiclo You guys seeing this?
2021-06-24 12:21:37 timemage twiclo, nope.
2021-06-24 12:21:40 mrmonday yep
2021-06-24 12:21:40 twiclo Shit
2021-06-24 12:21:41 nCrazed mrmonday: so that sounds like "just use SASL"
2021-06-24 12:21:53 cehteh well you may need to add the (forgot which one) flag about unidentified people are muted
2021-06-24 12:21:58 lambda just use CERTFP, honestly
2021-06-24 12:21:59 mrmonday nCrazed: honestly, just use SASL :3
2021-06-24 12:21:59 twiclo I got kicked out for not having sasl but reconnecting put me back in here so I guess I'm good
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2021-06-24 12:22:19 bertptrs get SASL :P
2021-06-24 12:22:30 cehteh also betelgeuse should eventually fix his connection .. or maybe its just some bot :D
2021-06-24 12:22:32 mrmonday cehteh: will try without for now, see how it goes
2021-06-24 12:22:49 nCrazed twiclo: yeah, if you're running the client on some of the commong VPS provider instances, you might be required to use SASL by the network
2021-06-24 12:22:59 cehteh dont blame me when spam happens now, i mean with no protection at all it may be
2021-06-24 12:22:59 nCrazed I got hit by that
2021-06-24 12:23:14 twiclo Nope this is just weechat on my local machine
2021-06-24 12:23:17 mrmonday twiclo: you don't "need" SASL, but if you have a NickServ account you should be using it rather than sending an identify command
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2021-06-24 12:23:47 mrmonday it means you're identified from the start of the connection, rather than at some point after
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2021-06-24 12:24:53 bertptrs the flag is +M btw in case something happens
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2021-06-24 12:26:48 mrmonday it's actually `+q $~a`
2021-06-24 12:27:13 mrmonday +M doesn't exist, +m means no one can speak without voice
2021-06-24 12:27:14 bertptrs non standard options will be the death of me, youre right
2021-06-24 12:27:31 mrmonday I suppose we could auto voice registered users and set +m
2021-06-24 12:27:58 cehteh sounds right, i rememebr, i set it for ##posix but forgotten which flag it was
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2021-06-24 12:29:30 mrmonday if we're using quiets, I'm rather have +z so ops can still see the messages... but then we have to have people opped, and I'd rather not have that
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2021-06-24 12:30:12 mrmonday if spam gets bad I suggest we talk to staff about having ozone in here permanently
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2021-06-24 12:31:30 cehteh the spam problem got a lot better recently
2021-06-24 12:32:20 mrmonday afaik we have had 2 spam attacks here since the move to libera - one was what triggered the initial +r, in the other the spammers ended up in ##rust-unidentified so only I saw it ;)
2021-06-24 12:33:22 mrmonday the real problem with spam is that we might not always have an op here to deal with it
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2021-06-24 14:40:10 habnabit_ mrmonday, have you seen #libera-bots ?
2021-06-24 14:40:32 habnabit_ one of the bots you can get for the channel has flood controls on it
2021-06-24 14:41:25 mrmonday yes
2021-06-24 14:41:48 mrmonday thanks :)
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2021-06-24 15:03:09 meeg_leeto hey hey
2021-06-24 15:03:10 meeg_leeto https://play.rust-lang.org/?version=stable&mode=debug&edition=2018&gist=0eb4edcd9f5a9f8346d8cae6770957a7
2021-06-24 15:03:25 meeg_leeto someone help: is the compiler not being smart enough or am i missing something
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2021-06-24 15:03:36 meeg_leeto also: please don't tell me to just |x| x + 1 haha
2021-06-24 15:03:54 meeg_leeto *someone please help, that sounded rude, sorry
2021-06-24 15:04:40 meeg_leeto like, it seems correct to me that if the iterator is required to live for 'this, then the closure in (iterator).map() should also only have to live for 'this
2021-06-24 15:04:43 meeg_leeto and not 'static
2021-06-24 15:07:53 bihtori I don't know much what it's supposed to do but the when you try to compile it the compiler suggests a .map(move |x| ... suggest you try that
2021-06-24 15:07:58 Arnavion Not sure where you got 'static from. Your reasoning about the closure only needing to live as long as 'this is correct, and the error tells you what to do to fix it
2021-06-24 15:08:04 mrmonday meeg_leeto: the compiler is correct, since you're returning an Iterator with 'static lifetime
2021-06-24 15:08:20 mrmonday and that iterator includes the closure
2021-06-24 15:08:25 mrmonday so the closure needs to live that long
2021-06-24 15:08:29 Arnavion mrmonday: No they're not, and the compiler doesn't say anything about 'static
2021-06-24 15:08:33 meeg_leeto ? am I not returning an iterator with a 'this lifetime?
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2021-06-24 15:08:43 meeg_leeto I don't want to move, as I can't move `self`
2021-06-24 15:08:47 Arnavion Yes you can
2021-06-24 15:08:50 meeg_leeto since I return impl Iterator + 'this
2021-06-24 15:09:13 Arnavion Why do you think you can't move self
2021-06-24 15:09:47 meeg_leeto I mean, because it's a map over an iterator, moving self would make the closure FnOnce
2021-06-24 15:09:55 mrmonday I completely misread the error, ignore me :<
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2021-06-24 15:09:56 mrmonday sorry
2021-06-24 15:10:00 meeg_leeto and destroy the struct, or am I wrong on this
2021-06-24 15:10:09 meeg_leeto mrmonday npnp
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2021-06-24 15:10:52 Arnavion Why do you think that
2021-06-24 15:10:52 Arnavion Or better yet, what you think the type of `self` is in the body of fn slice?
2021-06-24 15:11:10 meeg_leeto `&Self`?
2021-06-24 15:11:11 Arnavion Put your hypothesis to the test. If adding `move` makes the closure a `FnOnce`, then the code shouldn't compile since `Iterator::map` requires an FnMut. Yet it compiles. Why?
2021-06-24 15:11:22 meeg_leeto will move move the reference rather than the *reference?
2021-06-24 15:11:28 Arnavion It moves `self`
2021-06-24 15:11:36 Arnavion The type of `self` is &'this Self
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2021-06-24 15:12:00 Arnavion What's wrong with moving &'this Self into a closure? Why would it make the closure an FnOnce?
2021-06-24 15:12:01 meeg_leeto ah so it moves just the reference; is &'this Self copiable/clonable?
2021-06-24 15:12:19 meeg_leeto Arnavion none at all, just hadn't thought that it could be the reference itself moved
2021-06-24 15:12:21 Arnavion That has nothing to do with making a closure FnOnce
2021-06-24 15:12:40 Arnavion let s = String::new(); move || s.len() < This closure is FnOnce, FnMut and Fn
2021-06-24 15:13:21 meeg_leeto yep, I see now
2021-06-24 15:13:22 meeg_leeto thanks!
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2021-06-24 15:20:21 lambda ...did they just not even try doing the exact thing the compiler told them to do?
2021-06-24 15:20:46 lambda rustc error messages are extremely helpful, but apparently people still don't appreciate them enough :(
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2021-06-24 15:22:56 mrmonday they came here to understand, that's a good thing
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2021-06-24 15:23:12 mrmonday just because the compiler tells you how to fix something doesn't mean you should just do it
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2021-06-24 15:23:28 Geekingfrog tbf, I would've followed the advice but still wouldn't quite understand the why of all of that. I found the explanation helpful.
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2021-06-24 15:24:49 mrmonday I wonder if the error codes linked from the compiler errors could benefit from more examples/explanations in different contexts
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2021-06-24 15:26:02 mrmonday the code sample for the error explanation (https://doc.rust-lang.org/stable/error-index.html#E0373) looks nothing like the code that was linked
2021-06-24 15:26:30 mrmonday while it might be the same from the compilers perspective, it's not necessarily so obvious as the person writing the code
2021-06-24 15:27:43 bihtori Figuring out what makes a closure just FnOnce, FnMut or Fn is strictly above my level of comprehension so I do what the compiler suggests lol. If move doesn't help it I maybe try to .clone() something but if that doesn't work that's a dead end. Been there.
2021-06-24 15:29:36 -- aoei is now known as solarwinds123
2021-06-24 15:32:08 GreenJello bihtori, try FnOnce (least restrictive for the caller, most restrictive for you), then FnMut (middle for both), then Fn (restrictive for caller)
2021-06-24 15:32:41 GreenJello that will work out 95% of the time;
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2021-06-24 17:31:26 kee I'm no longer looking for an elegant solution; I'm just looking for something that works.
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2021-06-24 17:31:32 kee How can I get a picture on the screen?
2021-06-24 17:31:47 kee (Dynamically-generated video, like for a computer game.)
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2021-06-24 17:34:24 kee Polystrip with vulkan doesn't work; the .next_frame() family just hangs.
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2021-06-24 17:37:38 GreenJello kee, it would be overkill, but piston should be fairly straight forward and cross compatible
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2021-06-24 17:38:01 GreenJello they have an image example
2021-06-24 17:38:59 kee GreenJello: Yeah, piston works…
2021-06-24 17:39:13 kee I kinda lied when I said about an elegant solution.
2021-06-24 17:39:18 kee I want something that fits on my hard drive.
2021-06-24 17:39:32 kee And uses less than half my RAM to compile.
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2021-06-24 17:42:21 mrmonday dump an image file to disk, launch whatever image viewer is already on the OS?
2021-06-24 17:42:39 mrmonday not elegant, but does put an image on the screen
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2021-06-24 17:43:11 kee mrmonday: I'm almost at that point.
2021-06-24 17:43:41 kee rgx has no inline documentation (so the generated docs are empty) but looks just about usable.
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2021-06-24 17:44:02 kee Any reason I should give up on it early?
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2021-06-24 17:46:54 kee Found one: it's a mid-level abstraction over GPU pipelines, with no documentation (or comments), so I don't know how to use it.
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2021-06-24 19:54:28 davros anyone know off hand if the underlying thread model allows something like.. spawning threads with a maximum timeslice limit (eg. "this thread and its children can never consume more than 10% of CPU time")
2021-06-24 19:55:23 davros ^ i realise that '% of cpu time' will also be complicated by cores. ("no more than 10% of any core" vs "no more than 10% of the systems total execution resources"
2021-06-24 19:55:37 ssbr_ davros: your OS might support that, Rust doesn't do anything special here.
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2021-06-24 19:57:35 ssbr_ I think linux only does it at the granularity of a process (e.g. https://manpages.ubuntu.com/manpages/xenial/man1/cpulimit.1.html )
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2021-06-24 20:21:38 danieldg davros: on linux, look at clock_gettime CLOCK_THREAD_CPUTIME_ID, but stopping a thread after an 'expriy' of time left has all the same issues as thread cancelling, so you can't really do that nicely
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2021-06-24 20:21:38 davros ssbr 'process' .. rather than thread . so for what i have in mind , on "most OS's", it would be a case of spawning a process and doing inter-process-communication, i guess.
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2021-06-24 20:22:45 danieldg davros: or look at timer_create, but note that signal handlers are just as unsafe
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2021-06-24 20:29:15 davros danieldg ssbr_ .. "seperate process" might be what i need for this scenario ... i will explain the notion
2021-06-24 20:29:57 davros i wanted to provide an environment uising my game to train/test some other peoples AI engines . those themselves are written in C/C++ anyway
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2021-06-24 20:30:40 danieldg yeah, you want this in another process, probably with sandboxing
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2021-06-24 20:30:44 davros i could spawn a process running one of their engines, give it a timeslice (like "10% of the cpu can be spent on AI"), and feed it abstract info
2021-06-24 20:30:57 davros and yeah.. i'd want to give them a memory limit aswell..
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2021-06-24 20:31:22 danieldg this is really what the original seccomp is for, if you want to go that far
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2021-06-24 20:31:45 ssbr_ davros: this is *definitely* something that's best done with process boundaries, yes. You can even set memory limits.
2021-06-24 20:31:49 davros i've never used processes this way.... i'm vaguely aware of their existence
2021-06-24 20:32:11 davros the fact these guys AI engines are really designed as standalone things..
2021-06-24 20:32:29 danieldg create a proceses (std::process), have it launch a wrapper program you write
2021-06-24 20:32:44 davros "ok you think you can create AGI someday.. may in the meantime you can give me an interesting controller for a shooter game enemy.."
2021-06-24 20:32:57 danieldg have the wrapper program load the AI engine (but not start it), set up sandbox & limits, then run
2021-06-24 20:33:31 Tv_ what's a nice way to have an executable that can be used by tests, but not bother regular users with that in e.g. cargo install
2021-06-24 20:33:57 danieldg Tv_: have it built only with a test feature, maybe
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2021-06-24 20:51:15 Tv_ danieldg: that seems to have an unfortunate side effect of building another copy of the lib, even with `cargo build --features=foo --bin=foo`. still, very workable
2021-06-24 20:53:28 Tv_ added to Cargo.toml [features] foo = [] [[bin]] name="foo" required-features=["foo"]
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2021-06-24 20:53:56 Tv_ i wonder if there's a way to do #[cfg(test)] on a binary
2021-06-24 20:55:07 Tv_ like how [target.'cfg(windows)'.dependencies] does
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2021-06-24 21:06:41 Tv_ i guess i should just use a tests/foo.rs that does nothing when run by `cargo test`
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2021-06-24 21:13:41 Tv_ yeah nothing else but tests/foo.rs, [[test]] name = "foo" harness = false and a fn main that requires a special tickle to do anything
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2021-06-24 21:44:55 routeveg Hi all
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2021-06-24 21:45:32 routeveg Is there a reasonable way to achieve Option<Option<T>> -> Option<T> ?
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2021-06-24 21:46:15 danieldg routeveg: look at the docs, there's a function for it
2021-06-24 21:46:25 routeveg I want to get exit status of a potentially running process. Currently got: Child::try_wait().ok().and_then(|o| o)
2021-06-24 21:46:34 routeveg The end part is making me sad
2021-06-24 21:46:57 GreenJello .flatten()
2021-06-24 21:47:01 routeveg I looked at the Option page and couldn't find anything that looked right
2021-06-24 21:47:14 danieldg searchig for Option<Option<?
2021-06-24 21:47:25 routeveg Oh, oops! I was looking at the option module, not the Option type
2021-06-24 21:47:28 routeveg I found it now!
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2021-06-24 22:08:15 nitrix If there's also a T -> Option<T>, we've got ourselves Monads!
2021-06-24 22:10:02 danieldg nitrix: Into does that
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2021-06-24 22:28:21 routeveg nitrix: Some() is just that
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2021-06-24 22:29:09 routeveg I do like how rust is sneaking monadic features into a space occupied by engineers doing 'real work'
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2021-06-24 22:29:21 routeveg Though C# kinda beat them to that
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2021-06-25 04:35:22 capitol I just saw: https://github.com/MakotoE/clippy-output
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2021-06-25 04:50:20 rk4 what are these 'monadic features' rust is sneaking in, in terms of some one who knows rust but not haskell
2021-06-25 04:51:57 RedCrab I have a trait with a function that I want to have a return type of Result<Self, Error>. Unfortunately Self is not Sized. How can I work around this?
2021-06-25 04:52:21 * rk4 waits to say box it but tbh has nfi
2021-06-25 04:52:22 Mutabah I assume you want the trait to be object safe?
2021-06-25 04:52:22 j`ey RedCrab: you could add a: where Self: Sized, bound?
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2021-06-25 04:53:59 RedCrab Yes, I want it to be object safe. And j`ey So the signature would be "fn do_thing(self) -> Result<Self, Error>". Where should the Sized part go in here?
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2021-06-25 04:56:20 RedCrab Ah, I think I see. Result<Self,Error> where Self: std::marker::Sized
2021-06-25 04:56:31 j`ey ye
2021-06-25 04:56:52 j`ey btw Sized is in the prelude, if you didnt want to qualify it fully
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2021-06-25 04:58:28 RedCrab I see, thanks
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2021-06-25 05:01:58 Gottox z
2021-06-25 05:02:01 Gottox whoops
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2021-06-25 05:36:21 bluss does anyone know a crate for compile-time integer parsing? To use from option_env!() and generating const's from parsing build time env vars. I already have my own PoC, so I know it's possible
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2021-06-25 05:40:19 j`ey bluss: https://docs.rs/konst/0.2.4/konst/primitive/fn.parse_i64.html
2021-06-25 05:40:51 j`ey (not an endorsement :P)
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2021-06-25 05:56:00 ssbr_ rk4: whenever says "monadic composition", I mentally translate as "the ? operator", and 40% of the time I'm right.
2021-06-25 05:56:12 ssbr_ which actually is not very good, I need a better shortcut.
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2021-06-25 06:03:17 bihtori How does '?' operator relate to monads?
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2021-06-25 06:22:50 Arnavion monad?; rest is essentially sugar for monad.and_then(rest) but is easier to write than manually thunking, esp when dealing with branches and loops. It's similar to Haskell's `do` and F#'s `!` computation expressions, but constrained to only work for Result and Option (atm)
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2021-06-25 06:24:16 Arnavion Well, s/essentially/conceptually/ perhaps. It actually does compile to early returns and not .and_then() after all
2021-06-25 06:25:55 mason0 it relates to, and has about as much (or as little) to do with monads as flat_map does.
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2021-06-25 06:26:51 Arnavion and_then is flatMap, yes
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2021-06-25 06:49:02 vasilakisfil I have a type Foo, and I want to get from Foo another type Bar, it's easy to do the convertion and I can implement a From<Foo> for Bar. Thing is that I still want to create Bar from Foo, but I don't want ownership, Bar can very well behave itself with lifetimes. Is there a standard trait for getting Bar<'a> from Foo or should I just define my own method ?
2021-06-25 06:49:28 jbg generally you'd make an as_bar() method
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2021-06-25 06:49:35 jbg like String::as_str()
2021-06-25 06:50:09 vasilakisfil ok I see
2021-06-25 06:50:49 vasilakisfil thanks!
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2021-06-25 07:02:28 ssbr_ bihtori: people that refer to "monadic composition" often mean one specific monad -- in the ? case, Maybe
2021-06-25 07:02:45 ssbr_ idk, it's often very disconnected in non-haskell discourse IME
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2021-06-25 07:43:24 Ellipsis753 Hi. Can I cast a: `extern "C" fn(size: c_ulong) -> *mut c_void` into a: `unsafe extern "C" fn(sz: usize) -> *mut c_void`? (c_ulong and usize should be the same size for me.)
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2021-06-25 07:49:28 bluss j`ey: nice
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2021-06-25 08:02:12 kee Ellipsis753: Why do you need to cast it to an unsafe function?
2021-06-25 08:02:16 kee But transmute should do that.
2021-06-25 08:02:46 Ellipsis753 kee: Sorry. It's mostly the argument of c_ulong that needs to change to usize.
2021-06-25 08:03:09 kee In which case core::mem:transmute (or std::mem::transmute) should work.
2021-06-25 08:03:20 Ellipsis753 Ok. Thank you. :)
2021-06-25 08:03:43 j`ey and you can add an assert / static asser that c_ulong == usize if you wanted
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2021-06-25 08:15:19 Ellipsis753 The static assert is a good idea. I've added one now. Thanks.
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2021-06-25 08:15:38 kee The rafx-api functions are only marked unsafe if they can cause UB on the CPU.
2021-06-25 08:15:57 kee They can all cause UB by interacting with the GPU, but those aren't marked unsafe.
2021-06-25 08:16:07 kee Is that technically allowed?
2021-06-25 08:17:31 mason0 do you need to use unsafe to call a C function? what about to call a rust function that calls a C function?
2021-06-25 08:17:54 j`ey mason0: a C function needs unsafe
2021-06-25 08:18:00 j`ey mason0: a rust function that calls a C one doesnt
2021-06-25 08:18:52 bertptrs kee: UB from a Rust perspective or UB from a "this is an invalid state for the GPU" perspective?
2021-06-25 08:19:07 kee bertptrs: Not sure, but that sounds like the right question to ask, thanks.
2021-06-25 08:19:29 kee I think "invalid state for the GPU which then violates the assumptions that make the rest of the API safe".
2021-06-25 08:19:43 danieldg kee: there's no UB police that enforces this, but if it could cause memory corruption in the rust process it should be unsafe
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2021-06-25 08:57:53 kee Is kernel panicking unsafe?
2021-06-25 08:59:30 bertptrs causing a panic from userspace is usually a bug, what happens?
2021-06-25 09:00:19 kee Getting the GPU into a very invalid state.
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2021-06-25 09:00:36 bertptrs impressive
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2021-06-25 09:00:49 gchristensen neat
2021-06-25 09:01:17 kee Technically it violates Safe Rust's intrinsics, but no Rust code runs after that, so I think it's okay.
2021-06-25 09:01:37 bertptrs safe rust is allowed to panic :P
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2021-06-25 09:01:57 gchristensen the great big panic in the sky
2021-06-25 09:02:31 capitol sounds like it might be a nice testcase to submit upstream :)
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2021-06-25 09:12:00 trev is it possible to have an impl like impl<_, B> for Foo<_, B>, where you want to ignore a generic?
2021-06-25 09:12:21 bertptrs to avoid monomorphization, you mean?
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2021-06-25 09:15:15 trev bertptrs not smart enough for that word :\ i just want to be able to initialize a struct with access to limited methods, then have another impl where there are type bounds
2021-06-25 09:16:16 j`ey trev: cant you just say T instead of _?
2021-06-25 09:16:35 bertptrs you can impl<A, B> for Foo<A, B> and then just not place bounds on A and B. That does require also leaving those bounds on the generics of Foo, as no impl can have weaker bounds than the original definition
2021-06-25 09:18:30 trev yeah this might work. thanks friends bertptrs j`ey...i didn't realize the bounds were still on the struct definition
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2021-06-25 09:31:48 raekye is it correct to say that Cell and RefCell are not strictly more flexible than normal references because the compiler can do non lexical lifetimes with normal references?
2021-06-25 09:32:40 bertptrs I wouldn't phrase it like that. NLL only works in local scope. You can have an Rc<RefCell> and use it in ways impossible with NLL
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2021-06-25 09:34:26 raekye the case I'm working with right now is I have an immutable reference/borrow and later I need a mutable borrow (won't touch the immutable reference anymore)
2021-06-25 09:35:13 raekye I'm not 100% sure but I think if I write it naively it would cause a panic because the Ref only gets dropped at the end of the lexical scope
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2021-06-25 09:36:11 raekye But the rust compiler does let you take an immutable reference followed by a mutable reference as long as you don't touch the immutable reference once you make the mutable one right?
2021-06-25 09:36:27 raekye even if they're in the same scope
2021-06-25 09:36:41 j`ey yes
2021-06-25 09:37:05 bertptrs Especially if they're in the same scope. If not, the compiler has a harder time proving that it's safe to doso
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2021-06-25 09:40:23 raekye So if I'm using Cell/RefCell I need to explicitly constrain the lifetime/scope of Cell/RefCell to ensure the borrow ends, otherwise it will last to the end of whatever the original scope was, even if I stopped needing it partway, correct?
2021-06-25 09:40:49 raekye (in case there's a mutable borrow later)
2021-06-25 09:40:53 bertptrs yes. although manually dropping the borrow should work
2021-06-25 09:41:03 raekye ah true, that helps a lot
2021-06-25 09:42:21 raekye thank you, it's more clear to me now
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2021-06-25 09:48:52 raekye Hmmm just thinking, in general Rust must run drop at the end of the lexical scope because of possible side effects correct? E.g. if some drop implementation calls print, the programmer would expect it to execute at the end of the lexical scope
2021-06-25 09:50:06 raekye But since Cell/RefCell are part of the language/standard library and the compiler knows what its drop does, hypothetically couldn't the rust compiler apply NLL to Cell and RefCell as well?
2021-06-25 09:50:32 raekye I.e. drop them after their last use
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2021-06-25 09:50:57 raekye Not saying it's practical - having this special behaviour for Cell/RefCell (don't know how you would generalize it)
2021-06-25 09:51:11 bertptrs It could, but it doesn't right now. Whether that's a good thing is debatable. The problem is that while NLL failures result in a compiler error, RefCell NLL would result in a compile-time error
2021-06-25 09:51:19 bertptrs the last one should be runtime of course
2021-06-25 09:51:25 bertptrs And that would be very painful to debug
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2021-06-25 09:55:06 raekye Hmmm not sure I understood your second point. Wouldn't "RefCell NLL" be strictly more flexible without losing correctness? Ending a RefCell's lifetime after it's last use should not "hide" any accesses to the data inside (if the inner data is used, it must be through another borrow)
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2021-06-25 09:55:41 kee raekye: How would the compiler infer that it should do that?
2021-06-25 09:55:58 kee For normal references, there's no valid behaviour when you alias.
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2021-06-25 09:56:13 kee For RefCell, there's valid behaviour (which happens to be panicking).
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2021-06-25 09:56:44 kee So how should the compiler know to make an exception to the ordinary drop rules?
2021-06-25 09:59:58 raekye To correct myself by "without losing correctness" I meant that code that was correct (didn't panic) before would not panic or have a compile time error, and code that compiles still panics if mutable xor multiple references is violated at runtime
2021-06-25 10:00:14 raekye Again I'm not saying it's a good idea (because it would be an exception to the ordinary drop rules)
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2021-06-25 10:02:39 raekye And to be clear I'm not stating what I said as true, I'm asking if it's true
2021-06-25 10:03:52 raekye Indeed if NLL was applied to Cell and RefCell some programs that did panic would nolonger panic, in the same way some programs that didn't compile before NLL can compile (and are still correct) with NLL
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2021-06-25 10:23:54 cehteh i can use a Rc in multithreaded program when only one thread accesses the data ever?
2021-06-25 10:24:05 [code] yes
2021-06-25 10:28:07 cehteh arrg self referential structs are crap :D
2021-06-25 10:28:42 cehteh not going to work this way
2021-06-25 10:30:03 cehteh i have a TempDir and want to hook up some drop/destructor before that gets dropped, that drop funnction needs a &tempdir to it
2021-06-25 10:36:44 Geekingfrog would something like with_tempdir(|tempdir| {...}) work?
2021-06-25 10:39:35 cehteh when i have struct Foo { bar: Bar, baz: Baz}; each implementing Drop, then let foo = Foo{...}; drop(foo); in what order are the drops called? Foo, Bar, Baz or reverse?
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2021-06-25 10:43:34 Sobek I'd expect Foo to come first, I think (but that could be easily checked with a short program)
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2021-06-25 10:45:37 Geekingfrog https://play.rust-lang.org/?version=stable&mode=debug&edition=2018&gist=b1fb4d52e18060f61de72640715391e8 > cehteh
2021-06-25 10:46:47 cehteh Yeah .. thanks, i didnt want you do that for me, just thoguht if someone knows he could answer
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2021-06-25 10:55:46 Geekingfrog Well, I didn't know the answer and wanted to know :D
2021-06-25 10:59:57 cehteh anyway the thing work, simpler than expected
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2021-06-25 11:18:24 georgemp Hi..i'm trying to wrap my head around writing a swift package that wraps a rust library. anybody has experience with this, have pointers on how to write a single package that can produce a wrapper for both iOS and macOS?
2021-06-25 11:20:03 Sobek (I have no clue, but I am interested)
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2021-06-25 11:55:59 [code] georgemp: i'd imagine you'd have to to through the C abi. so it'd be just like a typical C integration.
2021-06-25 11:56:15 [code] georgemp: swift has some sort of C ffi right?
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2021-06-25 11:58:02 georgemp [code]: yeah..i've got the C ffi part done for the rust lib. I *think* i can wrap this up in some package that targets a single platform (ios/macOS). But, am trying to wrap my head around with trying to target multipl platforms (with mutiple architectures - ios has arm64 and ios_sim is x86_64 - macOS has arm64 and x86_64);
2021-06-25 11:58:47 georgemp i believe i should work towards creating some kind of xcframework that will be part of the swift package..and each framework will have a lipo'ed library for each arc
2021-06-25 11:58:56 georgemp reading up/trying that out now
2021-06-25 11:59:03 [code] yeah i'd try macos first. x86 unless you've got an M1 mac.
2021-06-25 11:59:19 * [code] knows nothying about swift ffi stuff
2021-06-25 12:00:03 georgemp i only have x86, but, eventually will have to include M1..just wondering if anyone had worked through this before :)
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2021-06-25 12:41:06 kee How can I drop things that were moved into a closure?
2021-06-25 12:41:12 kee I know that it's the last time the closure will ever run.
2021-06-25 12:41:41 GreenJello drop the closure
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2021-06-25 13:08:05 SoF hi! https://github.com/prove-rs/z3.rs/blob/8b77fc554def507162a3860bea659247f2939859/z3/src/func_decl.rs#L13 this function takes a slice of references, how do I create such a slice dynamically?
2021-06-25 13:08:40 SoF the Sorts seem to be new owned values that you create with e.g. Sort::int(&ctx), so I cant return a slice of references of those from a function
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2021-06-25 13:11:51 kee GreenJello: How do I affect the drop order within the closure?
2021-06-25 13:14:23 Arnavion SoF: Assuming you started with a Vec<Sort>, make a new Vec<&Sort> with vec_of_owned.iter().collect()
2021-06-25 13:14:28 GreenJello kee, I'm not sure if how that's determined
2021-06-25 13:15:16 Arnavion kee: Make a newtype that contains what you want captured, capture the newtype instead, and do whatever you want in its Drop
2021-06-25 13:16:49 SoF Arnavion: thank you!
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2021-06-25 13:32:27 cehteh can a macro infer what type the the caller expects?
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2021-06-25 13:33:32 GreenJello cehteh, in some ways, sure, e.g. you could have the macro produce Default::default() and inference would figure out what's expected
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2021-06-25 13:34:38 GreenJello you can also use the ? operator, or x.into(), etc.
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2021-06-25 13:35:55 cehteh yeah, but thats not what i mean, just some brainfart, imagine rust had a 'new' keyword, protoyping that with a macro, as sytactic sugar
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2021-06-25 14:03:17 oaken-source Hey, is it still possible to cross-compile the rust compiler?
2021-06-25 14:10:54 Arnavion Building stage 2 requires running stage 1, and building stage 1 requires running stage 0. I don't think there's anyway to say stage 2 should be cross-compiled and 0 and 1 shouldn't
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2021-06-25 14:11:49 Arnavion You can of course compile a host compiler will support for additional targets, but I assume you really do want a target compiler
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2021-06-25 14:15:16 oaken-source I want to bootstrap riscv for a distribution without relying on external binaries
2021-06-25 14:15:24 oaken-source *bootstrap rust
2021-06-25 14:15:33 oaken-source I have working rust binaries on x86
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2021-06-25 14:16:12 oaken-source I considered bootstrapping from mrustc, but that doesn't support riscv, as far as I can see
2021-06-25 14:16:52 oaken-source the goal would be to have a native rust compiler that I can package :)
2021-06-25 14:17:11 cehteh guix?
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2021-06-25 14:17:24 oaken-source parabola.
2021-06-25 14:17:34 oaken-source closely related :)
2021-06-25 14:17:49 kee oaken-source: x86 emulator
2021-06-25 14:17:54 Arnavion I think the only option is compiling on the target, ie making it the host. You can use mrustc to start off from a more recent point that 1.0.0
2021-06-25 14:18:27 oaken-source kee: I could run an x86_64 rustc on riscv using qemu user-mode emulation. but wouldn't that confuse the compiler?
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2021-06-25 14:19:42 cehteh somehow it would be cool when one could bootstrap a very fat compiler that can generate code for most (or even all) supported archs
2021-06-25 14:20:21 cehteh forget about all this toolchin hazzle just say --target and call it a day
2021-06-25 14:22:23 kee cehteh: Even better: a small compiler that can generate a version of itself using only a handful of instructions.
2021-06-25 14:22:42 kee Then, on the target arch, it explores opcode space and works out more efficient instruction combinations.
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2021-06-25 14:23:38 kee Feed it random binaries to go faster.
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2021-06-25 14:24:47 cehteh kee: gnu mes?
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2021-06-25 14:25:35 kee cehteh: In theory oaken-source you could use GNU Mes, but that's a long bootstrap chain.
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2021-06-25 14:27:05 cehteh yeah
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2021-06-25 14:27:49 kee rfx doesn't work; it's trying to load some `create_debug_utils_messenger_ext` that my Vulkan doesn't have.
2021-06-25 14:27:58 kee Any non-Piston graphics crates I haven't tried yet?
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2021-06-25 14:29:49 oaken-source how would I bootstrap rust from mes
2021-06-25 14:30:11 kee oaken-source: mes → g++ → mrustc → rustc → rustc → rustc
2021-06-25 14:30:17 cehteh " but that's a long bootstrap chain." :)
2021-06-25 14:30:29 oaken-source I have a working g++ on the platform, but the problem is that mrustc is only supported on x86
2021-06-25 14:30:40 j`ey add support for riscv :P
2021-06-25 14:30:50 kee oaken-source: Rust was bootstrapped, once
2021-06-25 14:30:50 Arnavion Oh right, I forgot about that
2021-06-25 14:30:57 oaken-source I'm afraid that could be slightly out of scrope x_x
2021-06-25 14:31:08 cehteh how are do other riscv distros bootstrap it?
2021-06-25 14:31:10 j`ey i mean, that really feels like it's in scope to me!
2021-06-25 14:31:52 oaken-source I could go ask in #fedora I guess
2021-06-25 14:32:09 kee oaken-source: https://github.com/rust-lang/rust/tree/00c856c0b1feac74df8b404fad94d74a0cf1624a
2021-06-25 14:32:14 Arnavion riscv distros compile on riscv instead of cross-compiling?
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2021-06-25 14:32:22 kee This version of Rust compiles from g++ (and later versions do too)
2021-06-25 14:32:39 kee Start with the latest g++-supported version of Rust and work your way up.
2021-06-25 14:33:05 kee Also you'll need clang.
2021-06-25 14:33:13 oaken-source I have clang
2021-06-25 14:33:43 Alexendoo would said old rustcs run on riscv?
2021-06-25 14:33:53 cehteh is there some official support for this? or does one need to figure that out on his own? (as little support as proper git tags)
2021-06-25 14:34:02 oaken-source I'm more concerned with llvm compatibility
2021-06-25 14:34:05 kee Alexendoo: I think they've used LLVM for ages.
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2021-06-25 14:34:47 j`ey kee: that git link, still requires downloading a rustc
2021-06-25 14:35:35 kee Oops. Didn't go far enough back.
2021-06-25 14:35:53 j`ey you need to go back to the ocaml version
2021-06-25 14:36:42 oaken-source I think I should provision a dedicated VM for this
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2021-06-25 14:39:31 kee oaken-source: https://github.com/rust-lang/rust/tree/f038f4d533f897a29f9422510d1b3f0caac97388
2021-06-25 14:40:17 oaken-source you can't be serious
2021-06-25 14:40:25 kee Well a later version should work.
2021-06-25 14:40:28 oaken-source that's the third commit in the history of rust :x
2021-06-25 14:40:28 kee But not much later.
2021-06-25 14:40:33 j`ey just 11 years of bootstrapping
2021-06-25 14:40:38 kee I don't know how to go forwards on GitHub.
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2021-06-25 14:42:14 oaken-source what about this one https://github.com/rust-lang/rust/tree/ef75860a0a72f79f97216f8aaa5b388d98da6480
2021-06-25 14:42:37 kee oaken-source: Yup.
2021-06-25 14:42:43 kee Anything with a boot/ directory should work.
2021-06-25 14:43:04 kee And that looks like the last one.
2021-06-25 14:43:06 kee Well done!
2021-06-25 14:43:12 oaken-source thanks :)
2021-06-25 14:43:26 oaken-source allright, I'll try building that and see how far this takes me. thanks for the help!
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2021-06-25 14:44:31 kee https://guix.gnu.org/blog/2018/bootstrapping-rust/ suggests you're not going to have fun.
2021-06-25 14:45:10 kee Unless you can write a script to go through every minor version… and that's once you've got to 1.0
2021-06-25 14:46:03 oaken-source au contraire -- this is actually a lot of fun :)
2021-06-25 14:46:11 kee It might be easier just to add mrustc support for RISC-V.
2021-06-25 14:46:33 j`ey yeah, it might be worth talking to Mutabah, and figuring out how hard that would be
2021-06-25 14:46:45 j`ey I mean, it's generating C after all, so hopefully most of it is generic
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2021-06-25 14:59:04 oaken-source j`ey: I guess I could try that too. you're right, it's worth a shot
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2021-06-25 15:00:11 ap5 rust-script is nice :D
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2021-06-25 17:09:55 * neshpion changes his interactive shell to rust-script
2021-06-25 17:13:02 tsdh Is there a concise way to ignore a Result must_use warning? I'm spawning a command greeting new users with a command that will surely exist. Even if it didn't, that would be unfortunate but no big deal...
2021-06-25 17:13:46 j`ey let _ = ..;
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2021-06-25 17:14:38 j`ey or command.ok();
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2021-06-25 17:16:53 tsdh j`ey: Ah, ok() is as concise as it gets. ;-)
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2021-06-25 17:36:37 tsdh IIUC, "cargo update" will only update dependencies to the most current micro version but never change major and minor version from what I have declared in Cargo.toml. Is there some cargo command which would also list new major/minor versions of the dependencies I have declared?
2021-06-25 17:38:04 cehteh it depends on how you declared the dependencies foo = "1" will use any 1.x.y (with some constraints, see manual)
2021-06-25 17:38:30 danieldg tsdh: not built-in, there are crates that do this though
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2021-06-25 17:38:40 danieldg cargo-outdated or whatever
2021-06-25 17:38:59 cehteh btw i yesterday learned about cargo-audit
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2021-06-25 17:54:15 tsdh Thanks.
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2021-06-25 18:45:08 Arnavion tsdh: https://paste.rs/hMH.sh
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2021-06-25 20:30:36 Silver_Golden o/
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2021-06-25 21:16:22 cehteh https://play.rust-lang.org/?version=stable&mode=debug&edition=2018&gist=48c277a5670d0b597dd945d4eca02e94
2021-06-25 21:16:35 cehteh could that mad idea work? :D ...
2021-06-25 21:17:58 danieldg cehteh: not as is
2021-06-25 21:18:22 cehteh i know that much, just a brainfart, i wonder if even posisble
2021-06-25 21:18:26 danieldg cehteh: this looks a lot like the Into trait, which actually works
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2021-06-25 21:22:05 cehteh idea is often you have function calls with nested ctors foo(Arc::new(Mutex::new(Something::new))), experiment is could this be resovled by a generic new() functions
2021-06-25 21:22:31 cehteh just a thought experiment so far, but i dont know rust well enough
2021-06-25 21:22:32 danieldg cehteh: Default::default() can do that
2021-06-25 21:22:53 cehteh for ctors with parameters
2021-06-25 21:23:01 cehteh foo(Arc::new(Mutex::new(Something::new(parameter))))
2021-06-25 21:23:33 cehteh uberallfs.current_dir(Box::new(TempDir::new().expect("created tempdir")));
2021-06-25 21:23:42 cehteh is what i have here, i was just thinking:
2021-06-25 21:24:11 cehteh uberallfs.current_dir(new TempDir::new().expect("created tempdir")); woudl look nicer (well i dont like C++ but :))
2021-06-25 21:24:45 cehteh then one iteration farer, this could be wraped in a new(P) -> R function
2021-06-25 21:24:58 cehteh maybe/maybe not
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2021-06-25 21:47:51 Mutabah oaken-source: Let me know how you go with adding riscv support
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2021-06-25 21:52:39 oaken-source Mutabah: if I come across any issues, I'll let you know.
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2021-06-25 23:38:16 jbg does anyone know of an existing way to format a rust_decimal::Decimal for a particular locale?
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2021-06-26 03:06:53 tsdh I use the toml crate together with serde and a custom struct for defining a config file format. Is there a way that the struct's docstrings would go as comments in the config file? Or some other way to add comments to the toml file?
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2021-06-26 03:15:18 tsdh jbg: Maybe the num_format crate will do? At least when you convert rust_decimal::Decimal to f64 before printing?
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2021-06-26 03:15:50 jbg oh, I know how to format an f64, but converting the Decimal to f64 is out of the question
2021-06-26 03:16:13 jbg since I'm using Decimal in the first place to make sure the value is represented precisely
2021-06-26 03:16:48 jbg it doesn't look like there is any way to do this currently, so I might look at making a crate / adding support to rust_decimal
2021-06-26 03:23:14 tsdh Ah, I think https://github.com/alexcrichton/toml-rs/issues/274 answers my question. Obviously, I hoped the answer would be positive. :-(
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2021-06-26 03:28:52 jbg yeah I've tried to do vaguely similar things before, and few if any of the file format serialisation/deserialisation libraries expose comments
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2021-06-26 03:42:29 tsdh jbg: Too bad, that would be very handy.
2021-06-26 03:42:49 rk4 i presume the way to implement a function generic over structs with attribute X is to define an trait with a getter method for attribute X, and defer to the compiler to probably inline foo.get_x() into just foo.x [?]
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2021-06-26 03:45:35 bertptrs That should work, yes. Especialy if you annotate the method with #[inline(always)]
2021-06-26 03:49:19 * rk4 nods
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2021-06-26 04:27:23 ap5 Has anyone here tried https://rust-script.org/ with emacs and LSP? I want code completion, but for a single file
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2021-06-26 05:16:00 hflug A silly question about captures: why does
2021-06-26 05:16:00 hflug fn f(delimiter: &str) -> ... {
2021-06-26 05:16:01 hflug move s: &str| match &s[..4] {
2021-06-26 05:16:01 hflug delimiter => Ok(...),
2021-06-26 05:16:02 hflug ...
2021-06-26 05:16:02 hflug }
2021-06-26 05:16:03 hflug complain that delimiter is unused, and that the match always matches the first pattern? I would have expected a capture of the argument into the closure.
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2021-06-26 05:18:40 Lumpio- Because the "delimiter" in the map just creates a new variable doesn't it
2021-06-26 05:18:44 Lumpio- While matching everything
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2021-06-26 05:18:59 Lumpio- err not map, match
2021-06-26 05:20:37 hflug Hm, and how do I make it match against an existing variable?
2021-06-26 05:21:54 j`ey foo if foo == delimiter
2021-06-26 05:22:07 j`ey foo if foo == delimiter => Ok(...),
2021-06-26 05:23:39 hflug Brilliant, thanks
2021-06-26 05:24:01 discipulus hflug: j`ey showed you how to use a "match guard"/"pattern guard"
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2021-06-26 05:59:20 shan how do i free a String
2021-06-26 05:59:24 shan can i even free a String
2021-06-26 05:59:33 bertptrs A string frees itself when it goes out of scope
2021-06-26 05:59:51 ChaiTRex shan: If you want to do it manually, drop(string)
2021-06-26 06:00:01 shan bertptrs: it's in main
2021-06-26 06:00:13 bertptrs then drop, like ChaiTRex said
2021-06-26 06:00:26 shan okay
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2021-06-26 06:28:56 shan how do i get the length of a vec?
2021-06-26 06:29:44 j`ey .len()
2021-06-26 06:29:46 shan oh len() is a thing nice
2021-06-26 06:29:49 shan j`ey: thanks
2021-06-26 06:29:51 j`ey https://doc.rust-lang.org/std/vec/struct.Vec.html
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2021-06-26 06:41:36 jbg shan: even if it's in main(), it will free at the end of main(), you don't need to drop manually unless you want to drop it earlier
2021-06-26 06:41:51 shan right
2021-06-26 06:42:20 jbg and if you want it to drop earlier, you can also make a new scope for it (even an anonymous one, just using braces) which can be tidier than littering drop() calls around
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2021-06-26 08:20:55 shan ok ##rust, roast me https://github.com/shantaram3013/rust_learning/blob/main/todo/src/main.rs
2021-06-26 08:21:23 bertptrs I recommend you ask clippy to roast you first
2021-06-26 08:22:42 shan what's clippy :0
2021-06-26 08:22:51 shan the MS word assistant thing?
2021-06-26 08:22:56 jbg run `cargo clippy`
2021-06-26 08:23:00 bertptrs that's what it's named for, yes
2021-06-26 08:23:12 jbg it will tell you all the basic mistakes, saving the time of your human roasters
2021-06-26 08:23:33 ChaiTRex I see you're writing a Rust program. Would you like help with that?
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2021-06-26 08:37:24 shan jbg: OH
2021-06-26 08:37:26 shan thanks
2021-06-26 08:37:29 rk4 shan: i don't like the white background
2021-06-26 08:38:17 cehteh lol
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2021-06-26 08:45:11 shan Okay! I listened to clippy
2021-06-26 08:48:50 bertptrs What's the most efficient way to create a boxed slice of runtime-known length? I'm over-optimizing a programming challenge
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2021-06-26 08:49:23 j`ey bertptrs: vec![0; N].into_boxed_slice()
2021-06-26 08:49:23 cehteh why would one box a slice?
2021-06-26 08:49:38 bertptrs it's smaller than a Vec
2021-06-26 08:49:43 jbg cehteh: basically an array on the heap
2021-06-26 08:49:50 bertptrs 3 pointers vs 2 pointers
2021-06-26 08:49:59 cehteh ah
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2021-06-26 09:10:00 shan if let Err(why) = writeln!(file, "{}", line) { panic!("Error writing to temp file: {}", why) };
2021-06-26 09:10:09 shan can someone explain to me how this works
2021-06-26 09:10:22 jbg writeln! is a macro, and the code that it expands to returns a Result
2021-06-26 09:10:34 jbg Result is an enum with two variants, Result::Ok and Result::Err
2021-06-26 09:10:44 shan okay
2021-06-26 09:11:04 jbg the `if let ...` checks if the value matches a pattern, in this case Err(why)
2021-06-26 09:11:12 jbg so if it's an Err variant, the value inside the variant gets bound to `why`
2021-06-26 09:11:37 jbg I'm guessing you haven't read the rust book yet -- this is all covered early on
2021-06-26 09:11:45 jbg https://doc.rust-lang.org/book/
2021-06-26 09:12:10 shan how can if have `let` when `let xyz` is a statement
2021-06-26 09:12:18 rk4 reading the book might seem like more work, but it's a lot less work than not reading it
2021-06-26 09:12:31 jbg `if let` is a thing on its own
2021-06-26 09:12:37 * shan goes off to read the book
2021-06-26 09:12:42 shan thanks jbg + rk4
2021-06-26 09:12:46 bluss if let is like a mini version of match
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2021-06-26 09:25:21 talin hello. hello. i am working on a rust tutorial, and i don't understand why i had to add "pub" in front of the innermost modules but not the outermost one? https://play.rust-lang.org/?version=stable&mode=debug&edition=2018&gist=0477648afbb273e07073bf61d546afb2
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2021-06-26 09:27:19 cehteh talin: because thats in the same scope
2021-06-26 09:27:45 cehteh when you want to use that cross-crate then you need to put pub there as well
2021-06-26 09:28:14 talin aah, that makes sense. thank you
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2021-06-26 09:29:57 cehteh and i feel like 'pub mod' should be used rather sparingly, better reexport things
2021-06-26 09:30:33 talin how do you re-export?
2021-06-26 09:30:50 nox `pub use`
2021-06-26 09:31:04 cehteh pub use path::to::thing;
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2021-06-26 09:31:21 talin huh, okay. this packages chapter didn't mention that
2021-06-26 09:31:36 cehteh its somewhere mentioned
2021-06-26 09:31:59 cehteh but i agree .. grasping the module system at first gave me some trouble as well
2021-06-26 09:32:41 cehteh also i prefer to put modules in files, then reexports from lib.rs looking nicer too
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2021-06-26 09:34:10 talin i see. do you have an example of this?
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2021-06-26 09:35:16 cehteh yes but dunno if thats well done, i am beginner too :D
2021-06-26 09:35:28 cehteh https://github.com/cehteh/uberallfs/blob/master/objectstore/src/lib.rs
2021-06-26 09:36:13 cehteh just noticing some fuckup that can be cleaned up, but thats all WIP
2021-06-26 09:36:37 talin that seems like a cool project
2021-06-26 09:38:00 cehteh yes but very much to do
2021-06-26 09:38:20 cehteh had ideas about that like 15 years ago
2021-06-26 09:38:43 cehteh just started implementing it earlier this year for learning rust
2021-06-26 09:39:13 talin nice. i am planning to start with something much simpler than that
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2021-06-26 09:40:08 cehteh hehe .. in the meantime i did a few smaller/supplmentary things
2021-06-26 09:40:20 talin my plan is to get sort of "muscle memory" for the simpler parts of rust, such that when i tackle the harder parts i won't be struggling with so many things at the same time
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2021-06-26 09:42:10 cehteh yeah i am not there yet either, trying to learn things piece by piece as needed
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2021-06-26 09:42:55 cehteh small thing i did yesterday: https://github.com/cehteh/testcall
2021-06-26 09:43:24 cehteh that'll grow as needed as well
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2021-06-26 10:03:26 bertptrs ooh that looks nice
2021-06-26 10:05:18 cehteh thanks, i really was missing such
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2021-06-26 10:11:53 talin nice cehteh
2021-06-26 10:16:25 cehteh my brainfart from yesterday: https://play.rust-lang.org/?version=stable&mode=debug&edition=2018&gist=a8ec5723c5b9cc83e25598cfcf522736
2021-06-26 10:16:44 cehteh works somewhat but i dont know how to implement it for Box<T> and other generics
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2021-06-26 10:17:21 cehteh aka can we have a generic new function for 1-parameter constructors
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2021-06-26 10:18:16 j`ey cehteh: impl<P> New<P> for Box<P> {
2021-06-26 10:18:24 cehteh .. eventually even recursive? maybe not
2021-06-26 10:19:16 j`ey cehteh: https://play.rust-lang.org/?version=stable&mode=debug&edition=2018&gist=efce479f1801a96b0c4ca998e4e71a66 dunno what the issue with Box is?
2021-06-26 10:19:22 j`ey unless it was the T vs P thing
2021-06-26 10:19:31 cehteh j`ey: looks wrong because P is the parameter type?
2021-06-26 10:19:58 j`ey cehteh: and?
2021-06-26 10:20:05 j`ey that's the type of Box you want, Box<P>
2021-06-26 10:20:24 cehteh mmh
2021-06-26 10:20:29 j`ey you want to create a Box from a parameter P, so the Box will be Box<P>
2021-06-26 10:20:30 cehteh looks too simple lemme try :D
2021-06-26 10:21:04 cehteh oops :D
2021-06-26 10:21:08 cehteh works
2021-06-26 10:21:19 j`ey yeah i linked it working above! :P
2021-06-26 10:21:19 cehteh did i say brainfart :)
2021-06-26 10:21:32 cehteh well now can we do that recursively
2021-06-26 10:21:46 j`ey recursively in what sense?
2021-06-26 10:22:22 cehteh like (stupid example) let foo: Rc<Box<String>> = new("foo");
2021-06-26 10:22:48 cehteh mean impl New for New? :)
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2021-06-26 10:26:27 cehteh my thought experiment here is to make code nicer readable when you call functions, like sometimes you have fn foo(Arc<Mutex<Box<Something>>>) ...... and then you need to call foo(Arg::new(Mutex::new(Box::new(Something::new())))) ...which is a bit over-verbose
2021-06-26 10:26:48 danieldg cehteh: I think you need to use it like "trait New { type SingleArgument; fn new(a : Self::SingleArgument) -> Self }
2021-06-26 10:27:03 danieldg cehteh: that will let the compiler infer down the chain properly
2021-06-26 10:27:10 cehteh ah
2021-06-26 10:27:38 danieldg otherwise you have the issue with Into that x.into().into() is ambiguous about what the middle type should be
2021-06-26 10:27:43 cehteh yes
2021-06-26 10:28:00 cehteh i am not good with this stuff yet, just fooling around
2021-06-26 10:29:11 jbg cehteh: another thing to consider is that if the foo() in your example is going to store the thing passed to it, it might be able to wrap it in an Arc<Mutex< itself rather than making the caller do it
2021-06-26 10:29:36 cehteh yes was just a stupid example
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2021-06-26 10:29:57 jbg yeah for sure. just pointing it out because "hiding" an Arc or lock inside some structure is a common pattern
2021-06-26 10:30:41 cehteh the idea started here in my testcode lookin at:
2021-06-26 10:30:43 cehteh uberallfs.current_dir(Box::new(TempDir::new().expect("created tempdir")));
2021-06-26 10:31:03 jbg yeah so why not just pass the TempDir - if current_dir() needs it boxed it can box it itself
2021-06-26 10:31:14 jbg or does it take a trait object?
2021-06-26 10:31:21 jbg (I didn't look at the code)
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2021-06-26 10:32:53 cehteh which should been easier .. .and current_dir(trait_here: Box<dyn TestDir>)
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2021-06-26 10:33:03 cehteh yes its a trait
2021-06-26 10:33:05 jbg ah right
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2021-06-26 10:33:59 cehteh well as saying its just a thought experiment, i mean it would be somewhat cool if a really useable New trait falls out of this experiment, but i have doubts by myself :)
2021-06-26 10:34:39 cehteh actually if thats doable i wonder why the stdlib doesnt have such
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2021-06-26 10:35:57 jbg there's a lot of doable stuff that std doesn't contain
2021-06-26 10:36:08 j`ey I cant see how you can make it handle multiple types in a single new :/
2021-06-26 10:36:39 cehteh j`ey: it should not
2021-06-26 10:36:47 danieldg you can't, not if you also want it to chain
2021-06-26 10:37:07 danieldg but a chaining one would still be useful
2021-06-26 10:37:19 danieldg Into already handles the multiple-types path
2021-06-26 10:37:20 j`ey cehteh: well you said you wanted: foo: Rc<Box<String>> = new("foo"), to work
2021-06-26 10:37:25 j`ey danieldg: it does?
2021-06-26 10:37:36 cehteh i dont want tro introduce anything magic, this should only safe some typing when the types are unambiugously defined
2021-06-26 10:37:41 j`ey you cant do: let a: A = C.into(); which goes via B
2021-06-26 10:37:43 danieldg the multiple-types but no-chaining path, I should say
2021-06-26 10:38:28 cehteh when theres some ambiguity then i really hope the compiler complains rather than picking something on its own
2021-06-26 10:38:39 jbg of course
2021-06-26 10:38:41 danieldg you could do let foo: Arc<Mutex<Wrapping<u64>>> = New::new(7);
2021-06-26 10:39:03 j`ey danieldg: how?
2021-06-26 10:39:14 j`ey unless you impl that directly
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2021-06-26 10:39:29 danieldg j`ey: trait New { type SingleArgument; fn new(a : Self::SingleArgument) -> Self }
2021-06-26 10:39:40 j`ey you cant just impl New for Arc, Mutex, Wrapping, and have that work
2021-06-26 10:39:43 cehteh well i have to go now, back later and otherwise i play next week with that, no urge
2021-06-26 10:39:45 danieldg j`ey: with an impl for each of Arc,Mutex,Wrapping that
2021-06-26 10:39:48 danieldg j`ey: why not?
2021-06-26 10:40:06 cehteh yes if couse everything needs a impl
2021-06-26 10:40:21 Alexendoo You would need GAT at the very least surely
2021-06-26 10:40:24 danieldg hmm
2021-06-26 10:40:48 danieldg oh, I think you need to specify how many levels down to walk
2021-06-26 10:41:00 danieldg yeah, ok, not as nice as I thought
2021-06-26 10:41:01 Alexendoo Otherwise you can't even impl that for e.g. Arc
2021-06-26 10:41:44 danieldg well, I was thinking: impl<T> New for Arc<T> { type SingleAgument=T; }
2021-06-26 10:42:03 Alexendoo huh I didn't think you could do that
2021-06-26 10:42:25 danieldg you would need to use it like: let foo: Arc<Mutex<Wrapping<u64>>> = New::new3(7);
2021-06-26 10:42:47 danieldg which is less nice
2021-06-26 10:43:46 danieldg trait New { type SingleArgument; fn new(a : Self::SingleArgument) -> Self; fn new2(a : <Self::SingleArgument as New>::SingleArgument) -> Self where Self::SingleArgument : New { ... } }
2021-06-26 10:43:53 danieldg and so on for new3,4,etc
2021-06-26 10:45:42 danieldg because otherwise you can't rule out something like impl New for Foo { type SingleArgument = Bar; } impl New for Bar { type SingleArgument = Foo; }
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2021-06-26 10:48:41 j`ey you're not selling it very well :P
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2021-06-26 10:49:15 danieldg well yeah, I thought that I could do it without the newN form
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2021-06-26 11:14:16 cehteh mhm
2021-06-26 11:15:15 cehteh the N can perhaps be a const generic? .. no idea, just peeking in here ... and there should be a impl New for T: Into to use that if available
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2021-06-26 11:43:20 nemo https://old.reddit.com/r/rust/comments/o1yy1p/announcing_rust_1530/h2488f5/
2021-06-26 11:47:25 cehteh old news :D
2021-06-26 11:48:23 cehteh still no emojis allowed
2021-06-26 11:48:59 cehteh Err(💩)
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2021-06-26 12:28:14 nemo cehteh: well... 1.53's support is old new
2021-06-26 12:28:16 nemo s
2021-06-26 12:28:32 nemo cehteh: but I had totally missed that awesome and hilarious idea of zalgo text
2021-06-26 12:29:05 nemo cehteh: and yeah. emoji are not allowed, but as we discussed at the time https://play.rust-lang.org/?version=beta&mode=debug&edition=2018&gist=f5dd4fc278f58bb8a5459afc68d754e2 works juuust fine ☺
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2021-06-26 12:40:47 southerntofu hello, is there a cargo flag to ignore "Cargo.lock" file? i thought it was ignored unless --frozen/--locked was passed
2021-06-26 12:41:23 danieldg just run 'cargo update'
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2021-06-26 12:45:59 southerntofu thanks! :)
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2021-06-26 16:44:34 Tacklebox I might just be crazy, but does the signature of https://docs.rs/zbus/1.9.1/zbus/struct.Proxy.html#method.connect_signal seem kind of unusable?
2021-06-26 16:45:34 Tacklebox The signal name is based on an ID assigned at runtime, so I need to build signal_name with `format!("{}", ...)` and then leak it with Box::leak to make it into a 'static str
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2021-06-26 16:46:16 danieldg yeah, if it's not intended to be a compile-time string, that signature is just wrong
2021-06-26 16:46:34 danieldg likely due to laziness on the part of the author
2021-06-26 16:46:47 j`ey it eventually calls https://docs.rs/zbus/1.9.1/src/zbus/proxy.rs.html#325
2021-06-26 16:47:39 danieldg heh, no need for static there
2021-06-26 16:48:13 Tacklebox Yea, since it gets an owned copy from that format! anyway
2021-06-26 16:48:18 Tacklebox Very strange
2021-06-26 16:48:22 kee But then you need a generic lifetime parameter, which is 0 more characters! Think of the extra typing.
2021-06-26 16:48:59 danieldg it's actually -8 characters
2021-06-26 16:49:06 Tacklebox I didn't mean to dunk on them, I was just unsure if I was having a brainfart or it was as un-ergonomic as it seemed.
2021-06-26 16:49:25 j`ey Tacklebox: hard to say, it might be intentional.. for some reason
2021-06-26 16:49:40 Tacklebox I will see if they will accept a PR, if it is for a good reason they will probably tell me when they reject it.
2021-06-26 16:49:48 kee danieldg: + <'a>'a but -'static – unless you're saying non-&self generic lifetimes are inferred?
2021-06-26 16:50:27 danieldg kee: at least sometimes they are, and this is one of them
2021-06-26 16:52:04 kee Is there any good reason for it to have +'static on H, but then box it?
2021-06-26 16:52:36 danieldg generally callbacks need to be 'static
2021-06-26 16:52:53 danieldg otherwise when you box them you get Box<dyn Foo + 'a> which is less useful
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2021-06-26 17:10:37 kee Is it possible to use::* a struct?
2021-06-26 17:10:47 danieldg yep
2021-06-26 17:10:51 kee How?
2021-06-26 17:10:51 danieldg er, no
2021-06-26 17:10:54 danieldg not a struct
2021-06-26 17:10:56 kee Aw.
2021-06-26 17:10:57 danieldg an enum, yes
2021-06-26 17:11:07 danieldg but that just gets you the variants
2021-06-26 17:11:11 kee The struct has a lot of associated constants and I was hoping to avoid typing them out.
2021-06-26 17:11:25 kee I can just use Struct as S; instead.
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2021-06-26 18:30:11 Yruama hi, does someone tried to translate a (small) c++ program in rust ? i wonder how it is usefull
2021-06-26 18:31:07 Tacklebox Yes, I think we can say with certainty that many people have translated c++ programs to rust. ;)
2021-06-26 18:32:22 davros how much auto-translation between c++ and rust works - i dont think there's anywhere near 100% coverage
2021-06-26 18:32:31 davros i think you can translate plain C to rust 100%
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2021-06-26 18:33:11 danieldg you can translate C++ to C too, but that doesn't make it a good idea :p
2021-06-26 18:33:22 Yruama the program i want to translate seems to be very old c++. source file extension are cc
2021-06-26 18:34:27 danieldg really if you want any of rust's benefits you need to do a bit of rewriting anyway
2021-06-26 18:34:27 j`ey cc doesnt make it old
2021-06-26 18:34:52 danieldg lots of things in C++ are unsafe in rust
2021-06-26 18:35:05 Yruama and i want to do this task to finally port it in a embedded target
2021-06-26 18:35:08 danieldg basically anything with iterator modification, for one
2021-06-26 18:35:10 davros converting c++ to rust could definitely be useful eg to simplify builds
2021-06-26 18:35:18 davros and to assist with bindings
2021-06-26 18:35:40 davros mixing c++ and rust just seems destined to be hard though, no way around that
2021-06-26 18:36:02 danieldg part of it is that the C++ ABI is compiler-specific
2021-06-26 18:36:52 davros just trying to build the smallest possible executable here .. nm is showing me i've got symbols in there , even after doing cargo build release ... i did have some lines in my cargo.toml to change the library opt level but have removed those (1min i'll paste my cargo..)
2021-06-26 18:37:57 Yruama davros, did you use "strip" ?
2021-06-26 18:38:10 danieldg the symbols are not likely a big part of the size
2021-06-26 18:38:54 Yruama i don't remember if it's possible to run strip automatically for release build
2021-06-26 18:39:34 davros ok let me try that. you're probably right
2021-06-26 18:39:46 davros also i guess the symbols are useful to get a histogram of useage
2021-06-26 18:39:59 Yruama histogram of usage ?
2021-06-26 18:40:19 danieldg davros: and for backtraces
2021-06-26 18:40:35 Yruama what is it? a kind of profiling ?
2021-06-26 18:40:41 danieldg but yeah, perf-record is pretty useless without symbols
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2021-06-26 18:41:54 kee Yruama: Are you using C++'s shared pointers?
2021-06-26 18:42:05 kee Or templates?
2021-06-26 18:42:20 davros thats a good point , anyone know where to start with statistical profiling with rust programs under linux
2021-06-26 18:42:35 j`ey davros: same as with C++
2021-06-26 18:42:36 davros any profiling i've done in anger has been in visual studio on windows and on consoles
2021-06-26 18:42:36 Yruama don't know for shared pointers, but there is some template
2021-06-26 18:42:45 j`ey davros: `perf`
2021-06-26 18:43:38 davros https://www.brendangregg.com/perf.html this thing i presume, thanks for the recomendation
2021-06-26 18:44:17 kee Yruama: Templates are hard to port.
2021-06-26 18:44:21 j`ey yeah davros
2021-06-26 18:44:30 j`ey its a kernel thing
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2021-06-26 18:45:19 Yruama kee, what you mean by shared pointers ? you talking about a raw pointer shared across object, or about the smart pointer ( i don't know if it exist in c++)
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2021-06-26 18:45:35 danieldg yes, c++ has smart pointers
2021-06-26 18:46:20 danieldg you need to manually figure out if you translate them to Rc<T>, Rc<RefCell<T>>, or Arc/Arc<Mutex
2021-06-26 18:46:23 Yruama danieldg, i know only the unique ptr
2021-06-26 18:46:29 danieldg shared_ptr
2021-06-26 18:46:52 kee I mean shared_ptr, thanks. The last person who wanted to port C++ had many complaints about it.
2021-06-26 18:46:52 davros perf record -F 99 <my executable> ... i'm guessing that'll spit out some big dump alongside it
2021-06-26 18:47:38 danieldg yeah, it writes to a file in the current dir
2021-06-26 18:47:58 Yruama kee, i think only template using number as parameter are hard to translate
2021-06-26 18:48:27 kee Yruama: Those are easier now, actually.
2021-06-26 18:48:46 danieldg heavy template use can be hard to translate regardless of the type
2021-06-26 18:49:02 danieldg especially if it uses non-obvious duck typing
2021-06-26 18:49:05 kee danieldg: Everything's easy with proc_macros.
2021-06-26 18:49:29 danieldg I think you have an interesting definition of easy
2021-06-26 18:49:37 kee Duck typing's a tricky one. The Rust equivalent is traits, right?
2021-06-26 18:49:43 danieldg yep
2021-06-26 18:49:48 Yruama kee, how you translate it ?
2021-06-26 18:50:05 kee I have a computer scientist's conception of easy: if it's not impossible, it's easy.
2021-06-26 18:50:07 danieldg but you actually have to make a trait, you can't just go "oh by the way I use .foo and .bar"
2021-06-26 18:50:26 kee Or find a convenient trait on crates.io, like the numeric traits.
2021-06-26 18:50:49 kee Yruama: Depends on the template. Often I'll just not.
2021-06-26 18:51:40 kee The easiest way is to work out what the template's trying to do, then do that thing in Rust (ignoring how the template did it).
2021-06-26 18:52:04 Yruama i just started to look a the source code, so i on't know what templates does in it
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2021-06-26 18:54:10 davros ok i have a "perf.data" spat out .. i;m looking around for something to analyse that..
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2021-06-26 18:54:38 j`ey davros: perf report
2021-06-26 18:55:06 davros thanks i just found that
2021-06-26 18:56:24 danieldg I find '--call-graph=dwarf' (used during record) to be useful
2021-06-26 18:57:13 davros yeah i was about to ask about that.. inclusive vs exclusive
2021-06-26 18:57:57 Yruama anothr question, is it frequent to get a more optimized executable when translating it in rust ?
2021-06-26 18:58:11 kee Yruama: Depends if you do it right.
2021-06-26 18:58:33 kee A rewrite normally gives you a more optimised executable, and Rust isn't *bad* for that.
2021-06-26 18:59:44 kee Rust does more at compile-time than C++ (lots of C++'s primitives are runtime), so possibly.
2021-06-26 18:59:47 Yruama i'm just curious about it, for i want to do, i just want ot avoid to get a less optimized binary
2021-06-26 19:00:09 kee However, doing stuff at runtime sometimes takes less code, which gives better cache efficiency.
2021-06-26 19:00:42 kee I wouldn't bet on Rust being faster in that regard. I think I could get Rust code faster than I could get C++ code, though.
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2021-06-26 19:00:51 kee Yruama: What is "optimised"?
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2021-06-26 19:01:32 Yruama kee, i was thinking about speed
2021-06-26 19:01:48 danieldg Yruama: if you're willing to use unsafe liberally, there's no reason you can't match speed in rust and C++
2021-06-26 19:01:53 davros rust and C++ are very similar in approach i.e zero-cost abstactions
2021-06-26 19:02:09 davros i would not expect performance increase in rewriting in rust.. just code-stability,manageability
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2021-06-26 19:02:16 danieldg sometimes safe rust will force you to add checks that C++ doesn't force
2021-06-26 19:02:47 danieldg there's nothing that will guarantee faster code from rust either
2021-06-26 19:03:00 kee danieldg: Except when working with other people's libraries, I've always managed to erase those using the type system.
2021-06-26 19:03:26 davros in my mind if there's any perf differnece, it's "which way the wind was blowing", "some libs haven't been optimized yet" whatever
2021-06-26 19:03:29 danieldg other people's code is always either horrible or wonderful
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2021-06-26 19:04:59 kee Yruama: Your target embedded platform: what kind of caching does it do on the CPU?
2021-06-26 19:05:02 Yruama i think i'm lucky, code i want to translate seems clear and well structured
2021-06-26 19:05:51 Yruama kee, i don't directly target embedded platform, i want to do it in two step
2021-06-26 19:06:18 kee Yruama: Yeah, but you won't need to do much porting to get it to the embedded platform.
2021-06-26 19:06:24 Yruama translate the software first, and then adapt it for embedded
2021-06-26 19:06:33 kee It's a good idea to keep your target architecture in mind when doing the translating.
2021-06-26 19:07:17 kee If there's no hysteresis in EEPROM access times, that means you can do pointers-to-pointers stuff that you can't really do on normal computers.
2021-06-26 19:10:17 Yruama lol, for target architecture, it's would be a stm32f411 at first. I will probably use a bigger chip if the project go far enougth
2021-06-26 19:10:35 davros (ok i see 'perf record blah -g / perf report --call-graph , shows columns with children etc
2021-06-26 19:10:44 Yruama i don't understand what is "pointers-to-pointers" stuff
2021-06-26 19:11:58 davros i hope this trace is reliable
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2021-06-26 19:12:06 Yruama i also don't understand what hysteresis for an access time ?
2021-06-26 19:12:17 kee Consider a binary tree.
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2021-06-26 19:12:42 kee If all memory access is the same, an actual binary tree is fastest; log_2 memory lookups.
2021-06-26 19:13:15 kee However, if adjacent memory accesses are faster, using (say) 10 items at each level (for 5*log_10 memory lookups on average) is better.
2021-06-26 19:14:19 Yruama ok, i don't think there is such things in my program
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2021-06-26 19:17:06 davros strip/symbols took my executable from 6.1mb to 2.5mb :)
2021-06-26 19:18:52 davros could anyone comment on the assumption that an executable will be the same ballpark size as webassembly (what's going through my mind is "how big will this be in a web-page" )
2021-06-26 19:19:25 davros ive been given a target of 5mb to aim at including data (2.5mb desktop code / its tight..)
2021-06-26 19:20:02 danieldg you can't comapre things like that 1:1
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2021-06-26 19:20:11 danieldg too many differences
2021-06-26 19:20:32 danieldg just actually compile it to wasm and check the size
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2021-06-26 21:20:46 meltyness 🤔 ...
2021-06-26 21:20:48 meltyness algae
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2021-06-26 22:05:58 meltyness i guess a fat "rust provides traits to implement inheritance" would be admitting rust is oop still lmao
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2021-06-26 22:14:27 habnabit_ meltyness, since when does 'OOP' require inheritance
2021-06-26 22:14:59 habnabit_ meltyness, rust types are pretty object-y even without traits
2021-06-26 22:16:25 meltyness data married with methods, inheritance, polymorphism, and encapsulation
2021-06-26 22:16:25 mike-burns If you need to do OO you can do it in Rust, but if you need to do imperative you can also do that in Rust. That doesn't make Rust an OOP.
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2021-06-26 22:17:24 meltyness Well I know OOP is kind of a dirty word nowadays because it mostly results in unnecessary complexity and crutches, and it was designed to make codebases tolerate ever-expanding complexity and monetization
2021-06-26 22:17:46 mike-burns It is what it is. It's a paradigm; up to you to use it for good.
2021-06-26 22:18:34 meltyness well, and eliminating dynamic libraries is another nail in that "the designers of rust detest OOP" coffin
2021-06-26 22:20:16 meltyness I don't know, I'm just procrastinating :{
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2021-06-26 22:20:25 danieldg not sure the dynamic library thing had anything to do with oop
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2021-06-26 22:20:48 danieldg it's more about rust not wanting to commit to an internal ABI
2021-06-26 22:21:00 davros meltyness: define "OOP"
2021-06-26 22:21:18 danieldg you can make rust shared objects and make rust use shared objects, using a C ABI
2021-06-26 22:21:39 meltyness davros: that thing i said starting with "data married with methods..."
2021-06-26 22:21:43 mike-burns I haven't seen any sign that the Rust designers "detest" OOP; they simply did not make an OOP language.
2021-06-26 22:22:09 meltyness hmmm... i'm not far in the tutorial, are types nestable?
2021-06-26 22:22:41 meltyness like, can a type contain a reference to an instance of another type?
2021-06-26 22:23:07 meltyness ... i mean "own" one
2021-06-26 22:23:18 danieldg a type can have a field of another type
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2021-06-26 22:23:32 danieldg recursion requires a Box or similar somewhere in the chain
2021-06-26 22:26:34 meltyness mike-burns in what sense is rust _not_ OOP? It seems to support all the features I know of, robustly.
2021-06-26 22:26:50 davros meltyness what rust doesn't like is what i call "class-based OOP" (with inheritance, and internal vtables )
2021-06-26 22:27:12 davros to many people OOP has come to mean Java/C++ virtual style classes
2021-06-26 22:27:19 davros rust doesnt' have that
2021-06-26 22:27:31 meltyness vtables -- you mean the methods are contained as a table of &self function pointers?
2021-06-26 22:27:39 davros but the broader point is that OOP itself is an ill-defined term
2021-06-26 22:27:46 mike-burns meltyness: you _can_ do OO in Rust, but you also don't have to. cf. Ruby, where you make classes with methods in them and that's your only option.
2021-06-26 22:28:15 davros vtables = array of function pointers yes .. in 'java/c++ style' there's a vtable pointer implicitely created held inside each object. Rust does not do this.
2021-06-26 22:28:34 davros but rust can use vtables ("trait objects") .. carried around by the pointer to the object, not inside the object itself.
2021-06-26 22:28:46 meltyness Oh I see, like the standard library doesn't pin you to the ground with a bunch of factories and crap
2021-06-26 22:28:51 mike-burns https://oswalt.dev/2021/06/polymorphism-in-rust/ - here's a more in-depth blog post about vtables in Ruby (from last week's(?) This Week in Rust).
2021-06-26 22:28:57 mike-burns Right.
2021-06-26 22:29:06 davros yeah the term "Polymorphism" is more useful than OOP
2021-06-26 22:29:12 davros rust has plenty of polymorphism..
2021-06-26 22:29:17 mike-burns It's not "an OOP language", but it gives you all the tools you need to do OO.
2021-06-26 22:29:41 meltyness yeah I read a book about C++, but I only ever learned Java
2021-06-26 22:29:47 davros i find that the word "OOP" is itself so 'overloaded' that it looses meaning
2021-06-26 22:29:59 mike-burns Yeah, some people even consider Java OOP!
2021-06-26 22:30:04 * mike-burns backs out
2021-06-26 22:30:21 davros mostly its 'java style classes'.. it can also mean smalltalk style message passing , loose binding stuff..
2021-06-26 22:30:35 davros rust certainly has a feature called 'objects' (trait-objects)
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2021-06-26 22:30:54 davros what they really mean it's not in the Java/C++ inheritance/internal-vtable camp
2021-06-26 22:31:10 davros has anyone got a catchy name for that :/
2021-06-26 22:31:12 meltyness I mostly think of OOP as a paradigm where "everything is a databse" (as opposed to everything is a file)
2021-06-26 22:31:29 davros i think the term OOP is too vague
2021-06-26 22:31:36 mike-burns OK so now we have to define "database"?!
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2021-06-26 22:31:56 meltyness yeah, like a relational database
2021-06-26 22:32:04 davros better to say "rust has polymorphism, but rust doesn't have classes". avoid the term OOP, it says too much and too little.
2021-06-26 22:32:34 danieldg more informative descriptions are always better
2021-06-26 22:32:35 meltyness ... well in that case, what functionality of a class does a Type exclude?
2021-06-26 22:32:37 mike-burns I don't think dwelling on "is Rust OOP?" will help you learn Rust, TBH. Maybe it will, but I would start with learning Rust and then philosophizing.
2021-06-26 22:32:46 danieldg meltyness: superclasses
2021-06-26 22:33:14 danieldg and subclasses too
2021-06-26 22:33:15 davros no class-inheritance; no internal vtable ptr. also methods are not defined inside a class. they're defined in 'traits and impls'.
2021-06-26 22:33:44 danieldg imo 'methods not defined in the class' is a purely syntax thing
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2021-06-26 22:33:58 meltyness ah, i see; all "inheritance" is limited to traits, rather than the wishful-thinking that any person could specify any useful template upon which other templates could be based on
2021-06-26 22:33:59 davros its quite significant for organization IMO
2021-06-26 22:34:28 davros it completely changes how you can organize projects and libraries
2021-06-26 22:34:53 mike-burns In OO .read would be defined on File, not on Read.
2021-06-26 22:34:54 davros it's also differnet in memory layout to 'class-based oop' (internal vtable vs fatptr vtables)
2021-06-26 22:35:49 davros meltyness IMO: traits are better at decoupling and extending, compared to class inheritance.
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2021-06-26 22:36:15 mike-burns It's certainly different.
2021-06-26 22:36:31 davros a class must know all the interfaces it will implement / via inheritance in c++ . in rust, you can add implementations to a type, outside the library it's defined in..
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2021-06-26 22:37:47 meltyness it seems like there should be some easy big-O notation-style description of why traits makes more sense than class inheritance, but it certainly has my intuition
2021-06-26 22:38:13 habnabit_ it is a shame that java weenies co-opted 'OOP' to mean 'must have inheritance'
2021-06-26 22:38:23 danieldg meltyness: it decouples implementation and interface
2021-06-26 22:38:37 danieldg it's one reason why IFoo is encouraged in Java
2021-06-26 22:38:48 meltyness class-inheritance forces inheritance to be a multiplicative event, where as trait-inheritance forces it to be a division event
2021-06-26 22:38:54 mike-burns I learned Smalltalk longer before Java, so OOP to me includes a class browser ...
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2021-06-26 22:39:22 habnabit_ smalltalk does it more right than java and certainly than C++
2021-06-26 22:39:22 meltyness or at least facilitates it to be a division event
2021-06-26 22:40:47 meltyness i mean,... "is-a, has-a, can-be" makes sense as far as "relations" go
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2021-06-26 23:55:25 davros mike-burns i see it as class inheritance centralises dependancies, trait-imples distributes dependancies
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2021-06-26 23:56:53 kline i have a large Vec<String> that I want many tokio tasks to all have immutable access to for reading, whats the best way to go about this?
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2021-06-26 23:57:14 kline (its a large structure they all need to use, i dont want each one to have its own clone)
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2021-06-27 00:06:22 jbg kline: Arc for shared ownership
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2021-06-27 00:07:32 jbg if it something with a shorter lifetime you could just pass the &Vec / &[] in, but tasks require 'static lifetime so unless the Vec is static you'll have to use Arc
2021-06-27 00:07:54 jbg immutable: Arc<Vec<T>>, mutable: Arc<SomeLock<Vec<T>> where SomeLock is a futures-aware mutex/rwlock/etc
2021-06-27 00:08:15 kline cool, i guess today is where i learn about Arc
2021-06-27 00:08:34 kline that Arc will end up as a static global outside of main, i guess?
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2021-06-27 00:09:26 jbg it doesn't have to
2021-06-27 00:09:43 jbg you can just instantiate it in main and pass it down from there if you prefer; that's mostly a stylistic choice
2021-06-27 00:09:46 kline oh
2021-06-27 00:09:48 kline of course
2021-06-27 00:10:00 kline its lifetime will be long enough since its reference counted
2021-06-27 00:10:04 jbg yup
2021-06-27 00:10:11 kline so even if main were to end, it persists, got it
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2021-06-27 00:18:47 kline jbg, thanks, this is remarkably pain-free
2021-06-27 00:20:47 jbg yeah. Arc is good. does what it says on the tin
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2021-06-27 01:42:38 wilfred I thought I could only mutate values through mutable variables, but apparently I can do mutations through any variables: https://play.rust-lang.org/?version=stable&mode=debug&edition=2018&gist=f22594fee620edc1bc97d6704f2c8e45
2021-06-27 01:43:38 wilfred what's the rule?
2021-06-27 01:44:38 cehteh google for 'inner mutability
2021-06-27 01:45:03 cehteh .. and bye o/
2021-06-27 01:45:44 wilfred google keeps pushing me towards interior mutability, which vec doesn't have AFAICS
2021-06-27 01:46:05 wilfred I don't think there are any Cell/RefCell fields inside Vec?
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2021-06-27 01:48:34 wilfred presumably `let mut foo = ...` is only shallow mutability, like `let` vs `const` in JS
2021-06-27 01:49:00 wilfred my `let foo =` is inferring `foo` as `&mut usize`
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2021-06-27 02:23:40 jbg wilfred: `let mut foo` means you can rebind foo to point to something else of the same type
2021-06-27 02:24:16 jbg if foo is owned, it also means you can call &mut methods on foo
2021-06-27 02:25:45 jbg with `let foo` where foo is type `T`, you can only call methods that take `T` or `&T` (potentially via autoderef)
2021-06-27 02:25:55 jbg but of course `T` might be `&mut Something`
2021-06-27 02:26:40 jbg and yes, last_mut() returns &mut usize
2021-06-27 02:26:53 jbg well, Option<&mut usize>
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2021-06-27 02:28:44 wilfred jbg: thanks, that makes sense
2021-06-27 02:29:05 jbg if your method took ownership of the Vec, you'd need the parameter to be `mut` in order to be able to call last_mut() on it
2021-06-27 02:29:20 jbg fn increment_last(mut items: Vec<usize>) {
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2021-06-27 02:38:33 davros is there a rust UI crate with an opengl back end (just browsing i see imgui-rs has a gfx-?? backend)
2021-06-27 02:39:09 davros https://crates.io/crates/imgui-opengl-renderer/0.11.0 ah here we go
2021-06-27 02:39:52 jbg I think most of the non-web-tech UI crates have GL backends don't they? https://www.areweguiyet.com
2021-06-27 02:40:45 jbg I quite enjoyed conrod when I played with it
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2021-06-27 02:43:34 davros is that retained or immiediate
2021-06-27 02:43:39 jbg immediate
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2021-06-27 03:00:32 rk4 i used to have `f().await?;` but then decided i wanted to log if i did return an error, so that turned into `if let Err(e) = f().await { log::info!("{:?}", e); return Err(e) }`, feels like there might be a more concise expression of this logic, any ideas?
2021-06-27 03:01:54 jbg f().await.map_err(|e| { info!("{:?}", e); e })?;
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2021-06-27 03:02:25 rk4 not bad
2021-06-27 03:02:29 jbg if you literally "want to log if you return an error", you could also log at the caller, or wrap this fn in something that logs (the `tracing` crate has a nice way to do that)
2021-06-27 03:03:39 davros lmao jbg. PISTON conrod, now i remember.
2021-06-27 03:03:47 davros those guys triggered me on my pet hate
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2021-06-27 03:04:04 jbg car analogies in software?
2021-06-27 03:04:10 davros "lets build our UI using f64 coordinates everywhere"
2021-06-27 03:04:16 jbg ah
2021-06-27 03:04:24 davros f64 coordinates and u64 indices , where f32 / u32 will do
2021-06-27 03:05:05 davros just incase you have to project your UI onto a continent instead of a monitor
2021-06-27 03:05:56 jbg meh
2021-06-27 03:06:21 davros MEH 32bit default for coordinates throughout my code, then having to switch it for the UI ???
2021-06-27 03:06:40 davros my 3d world works fine in 32bit but then i have to swap to 64bit for 2d???
2021-06-27 03:06:41 jbg no. "meh" I don't care :P
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2021-06-27 03:07:19 davros ok well do you have a suggestion for a rust 2d gui lib that makes a sane precision choice for its coordinates
2021-06-27 03:07:50 jbg it's not something I care about even a tiny bit (because I've never had occasion to make a GUI application where the choice of f32 vs. f64 would make any difference to anything at all)
2021-06-27 03:07:53 jbg so I have no idea sorry
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2021-06-27 03:10:06 davros imagine for example drawing debug map (how silly it would be having the world defined in 3d/32bit, and it works fine for flying around , zooming in etc), but then you have to cast to 64bit becaues the library architect doesnt' know that when you manage centres corrrectly, you can represent anything in 32bit
2021-06-27 03:10:42 jbg you can avoid the cast by just using f64 everywhere
2021-06-27 03:10:45 jbg what is the actual concern here?
2021-06-27 03:10:56 davros you're trolling me aren't you
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2021-06-27 03:11:05 davros vertex arrays taking up a significant chunk of memory
2021-06-27 03:11:12 davros swithcing to 64bit = doubling that
2021-06-27 03:11:27 jbg did you measure that for your app and determine that it was a meaningful amount versus the rest of the memory your app is using?
2021-06-27 03:12:04 davros its somethin glike 50% textures 40% vertices 10% everything else , ballpark
2021-06-27 03:12:15 jbg and the actual values?
2021-06-27 03:12:16 davros so suddenly doubling that 40% is a pretty big deal, yes
2021-06-27 03:12:27 jbg depends what actual amount of memory that 40% is
2021-06-27 03:12:30 davros the actual values - "as many as i can get"
2021-06-27 03:12:40 jbg that doesn't make any sense
2021-06-27 03:12:44 jbg all software exists in the real world with real constraints
2021-06-27 03:12:46 davros jesus
2021-06-27 03:12:48 jbg so the answer is not "as many as I can get"
2021-06-27 03:13:01 davros running on platform X with a certain amount of RAM
2021-06-27 03:13:06 davros content will be built for that amount of RAM
2021-06-27 03:13:12 davros the bulk of whihc is textures and vertices
2021-06-27 03:13:33 davros so doubling memory taken the vertices significantly dents how much you can fit
2021-06-27 03:14:05 jbg I see
2021-06-27 03:14:16 jbg so to clarify
2021-06-27 03:14:30 jbg you're planning to fill my memory with textures and vertices regardless of how much memory I have?
2021-06-27 03:14:48 davros to generate the best possible experience in a game
2021-06-27 03:14:54 davros you fill the available memory with art
2021-06-27 03:15:26 davros the more detail the better
2021-06-27 03:15:28 jbg but there are limits. for example, you only have so much art. perhaps you have it at multiple possible resolutions, but only up to a certain maximum resolution
2021-06-27 03:15:34 jbg your world is only a certain size
2021-06-27 03:15:39 davros detail = number of vertices
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2021-06-27 03:15:45 jbg it makes sense to attach actual numbers to these things so that you can determine which things actually matter
2021-06-27 03:15:46 davros no
2021-06-27 03:15:52 davros you have as much art as you can fit in memory.
2021-06-27 03:16:01 davros artists want to build more , usually
2021-06-27 03:16:12 davros then they have to cut it back until it fits
2021-06-27 03:16:23 jbg "fits" into what?
2021-06-27 03:16:24 davros your job as a programmer is to store the art as efficiently as possible
2021-06-27 03:16:29 davros the target platform
2021-06-27 03:16:36 jbg which has a defined amount of memory
2021-06-27 03:16:39 jbg so again we come back to my point
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2021-06-27 03:16:50 jbg you are working in the real world, not in some abstract "I need my vertices as small as possible" world
2021-06-27 03:16:55 jbg you can attach real numbers to these things
2021-06-27 03:16:57 davros jesus chrisst you fucking troll
2021-06-27 03:17:01 jbg not just percentages and "as much as possible" and rubbish like that
2021-06-27 03:17:25 davros rubbish is what you're spouting now
2021-06-27 03:17:27 jbg lol no need to swear at me
2021-06-27 03:17:46 davros the way game art is done is .. you have a target platform in mind.. and artists fill it with as much detail as they can
2021-06-27 03:17:56 davros the engine should be scalable
2021-06-27 03:18:07 jbg and my question was really extremely simple
2021-06-27 03:18:10 davros so the engine doesnt say "it will only run 8gb scenes on 8gb machiens"
2021-06-27 03:18:15 jbg for your target platform (which has an actual, defined, amount of memory)
2021-06-27 03:18:20 davros it will run "the biggest possible scene in the avaialbe memory"
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2021-06-27 03:18:29 jbg is this an actual issue
2021-06-27 03:18:36 jbg I am guessing the answer is "yes" since you are so angry about it
2021-06-27 03:18:41 jbg but you never actually answered, you just keep lecturing instead
2021-06-27 03:18:55 davros artist/desginers <-> code <-> target machine
2021-06-27 03:19:17 davros the job of an engine is to get as much of the artists/desginers work onto any target machine as possible
2021-06-27 03:19:23 jbg I guess the lecture will just continue?
2021-06-27 03:19:30 davros yes till you get the point
2021-06-27 03:19:32 jbg lol
2021-06-27 03:19:39 jbg all I did was ask a question, which I really regret now
2021-06-27 03:19:40 davros its not
2021-06-27 03:19:49 jbg I don't know if there is a perfect GUI engine for you
2021-06-27 03:19:53 jbg I suspect it doesn't exist
2021-06-27 03:20:01 davros "artist: heres X vertices, now load it into your machine"
2021-06-27 03:20:01 jbg because once you get f32 coordinates there'll be some other issue
2021-06-27 03:20:02 davros its
2021-06-27 03:20:02 jbg so just write one
2021-06-27 03:20:15 davros "arists: here's a scene.. here's a bigger scnee... here's an even bigger scene.."
2021-06-27 03:20:24 davros "can you fit this?"
2021-06-27 03:20:41 davros that process of improvement in quality stops earlier if ijust swap 64bit for 32bit vertices
2021-06-27 03:20:49 davros bigger/more detailed
2021-06-27 03:21:07 davros imgui is probably the right one
2021-06-27 03:21:26 davros it has game programmer heritage , they get these issues
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2021-06-27 03:22:22 davros er well / imgui is probably the right design but not the best possible one for rust, it'll have a bit of interfaceing friction i suspect
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2021-06-27 03:22:52 davros its probabyl good enough though ( i do think rust needs thigns designed around its faetures to really shine)
2021-06-27 03:25:43 saatii do you actually have millions of UI coordinates? or why does it matter?
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2021-06-27 03:41:24 davros i tried to explain to them.. not all cpus have fast 64bit float
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2021-06-27 03:42:00 davros because they dont need it
2021-06-27 03:42:50 davros what if you want to run the UI in a VR interface inside a 3d scene
2021-06-27 03:43:11 saatii VR gear without double support?
2021-06-27 03:43:25 davros double will most likely be slower
2021-06-27 03:43:44 davros in some cases alot slower, because 32bit dominates graphics
2021-06-27 03:44:05 saatii ok but the real question is, does it take up a significant fraction of execution time even if you use softfloats?
2021-06-27 03:44:43 davros its an eco-crime , using 64bits when 32 will do
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2021-06-27 03:44:57 jbg that's not an answer
2021-06-27 03:45:24 davros if you're doing financial modelling or scientific sim then sure you need 64bits
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2021-06-27 03:46:01 davros but rendering scenes that the eye can see on a monitor .. 32bits is enough and lets you have double the vertices for a given amount of silicon
2021-06-27 03:46:06 jbg is any of your perspective here backed up by actual data or do you just feel very strongly that using 64 instead of 32 is a waste?
2021-06-27 03:46:10 saatii davros: how many units do you have to ship to have a worse ecological footprint with that than the programmer
2021-06-27 03:46:36 jbg I mean, if you spend this much time on pointless bit-eco-warrioring I am doubtful any units get shipped at all
2021-06-27 03:46:38 davros consider the number of devices displaying UIs, graphics
2021-06-27 03:46:47 davros if they switched to 64bits , that would be a huge hit
2021-06-27 03:47:39 davros whats the point of using a fast language like rust if you're just going to double your footprint???
2021-06-27 03:48:00 davros the point of rust over C# or java etc is getting more out of a machine
2021-06-27 03:48:00 jbg I'm curious, do you write software in a commercial context or just for fun?
2021-06-27 03:48:12 davros right now for fun
2021-06-27 03:48:42 jbg these kinds of holy wars don't really gain you anything when you are trying to meet deadlines or requirements
2021-06-27 03:48:44 davros but my fun involves knowing i could send the techniques back to the commercial contexts i have been in or would be in if i had to get back into it
2021-06-27 03:48:52 davros yeah
2021-06-27 03:48:54 jbg the question is "does it matter", not "I am angry that I am using twice as many bits as I need to"
2021-06-27 03:49:06 davros see how long you last in a games company if you just swap in 64bits when 32 will do
2021-06-27 03:49:23 davros fit *as much* art in as possible
2021-06-27 03:49:29 jbg see how long you last in a games company if you spend three weeks writing your own library to get 32 bit coordinates when 64 bit coordinates would have been absolutely fine in every measurable way
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2021-06-27 03:49:43 saatii +1
2021-06-27 03:49:49 davros you have no idea
2021-06-27 03:50:01 davros games graphics libraries start with 32bit
2021-06-27 03:50:11 davros so by getting a 64bit gui librariy you introduce friction
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2021-06-27 03:50:30 davros its just a dumb decision.
2021-06-27 03:51:05 davros although with a language like rust, if you made it generic you wouldn't need to bake it in
2021-06-27 03:51:10 jbg oh god not this again
2021-06-27 03:51:30 jbg and generic indices for vec right?
2021-06-27 03:51:38 davros yes that aswell
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2021-06-27 04:02:21 jeho for const generics, e.g., `fn foo<const T: usize>(...)`, is there any way to put them in the `where` block?
2021-06-27 04:02:45 jeho or do they pretty much always have to appear fully defined in the generic parameter list?
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2021-06-27 04:53:15 currybullen i haven't come across a trait like "Fn(&'static str)" as seen in this example before https://paste.debian.net/1202556/. what is it? some kind of trait parameter?
2021-06-27 04:53:44 faern It's a closure
2021-06-27 04:54:14 faern The trait bound refer to this `Fn` trait: https://doc.rust-lang.org/stable/std/ops/trait.Fn.html
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2021-06-27 04:55:36 faern currybullen: Closures in Rust automatically implement the Fn, FnMut or FnOnce traits, depending on various properties of the closure code.
2021-06-27 04:56:26 faern Fn: A closure that can be called multiple times and can't modify it's own state (&self)
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2021-06-27 04:56:39 faern FnMut: A closure that can be called multiple times and modify its own state (&mut self)
2021-06-27 04:57:02 faern FnOnce: A closure that takes ownership of its own state and consumes it, so can only be called once (self)
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2021-06-27 04:59:55 currybullen right, thanks. i think i have some grasp on closures, i was mainly just curious about the (&'static str) part. i'm unfamiliar with the SomeTrait(type) syntax
2021-06-27 05:00:19 faern Yeah that's specific to closures. A bit magical
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2021-06-27 05:00:23 bluss jeho: for now, they need to be in the parameter list
2021-06-27 05:00:40 faern You can't do that for any trait. Like you can't do Debug(&'static str)
2021-06-27 05:00:40 jeho thanks bluss
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2021-06-27 05:01:35 currybullen faern: ah, i was suspecting it was something like that. thanks :)
2021-06-27 05:01:43 db48x you can also specify the return value
2021-06-27 05:01:52 db48x Fn(foo) -> bar
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2021-06-27 05:02:30 currybullen right i'm guessing the general form is something like Fn(type1, type2, ..., typeN) -> typeX
2021-06-27 05:02:45 db48x yep
2021-06-27 05:02:54 db48x and then the same with FnMut and FnOnce
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2021-06-27 06:18:16 davros hey jbg read this and learn
2021-06-27 06:18:21 davros [1] https://www.researchgate.net/post/GPU-floating-point-double-precision-vs-64-bits-fixed-point-What-will-be-the-difference-in-execution-time-on-an-Nvidia-TESLA
2021-06-27 06:18:30 davros [2] https://forums.developer.nvidia.com/t/question-about-64-bit-integer-performance/64147
2021-06-27 06:18:57 jbg [1] does not appear to be even remotely related to our previous conversation
2021-06-27 06:19:14 davros it is a genearl point about precision selection
2021-06-27 06:19:31 davros 'use as many bits as you need', not 'blindly use 64bit everywhere'
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2021-06-27 06:19:43 davros but the answers more importantly cover the tradeoffs in the machines
2021-06-27 06:19:47 davros READ AND LEARN, BITCH
2021-06-27 06:19:51 jbg right, and the general point I tried to make is that you should first determine how many bits you need
2021-06-27 06:20:00 jbg which you seem to be unwilling to do
2021-06-27 06:20:06 davros i already determined 32bit is enough
2021-06-27 06:20:11 jbg ok, how?
2021-06-27 06:20:28 davros "does the image look good enough"
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2021-06-27 06:20:38 davros yes the precision of the vertices is fine, but i'd prefer more vertices
2021-06-27 06:20:42 jbg I really don't appreciate your repeatedly swearing at me, btw
2021-06-27 06:20:54 davros if you keep trolling me, i will get angry and swear
2021-06-27 06:21:02 jbg I have literally no intention of trolling you
2021-06-27 06:21:05 jbg I am simply asking questions
2021-06-27 06:21:27 jbg you don't seem to have any data to back up your very strongly held opinions about this stuff
2021-06-27 06:21:34 jbg just links to other people's general opinions
2021-06-27 06:21:43 davros CPUs concentrated more on 64bit support because they do have to cover the full gamut of use caess like science where 64bit is needed
2021-06-27 06:21:45 jbg but the only thing that actually matters is data about *your* code on *your* target platforms
2021-06-27 06:22:04 davros GPUs are designed mostly for my target (graphcis), and then got adapted to science etc
2021-06-27 06:22:27 davros not all GPUs even do 64bit precision
2021-06-27 06:22:40 jbg sure
2021-06-27 06:22:49 davros most probably do today but the fact remains "more 32bit values" is better for graphics than "more precision per value"
2021-06-27 06:23:18 davros if 32bit is suffient for flying around a 3d scene, its also sufficient for placing text on a screen
2021-06-27 06:23:36 jbg depends how big your screen is, but sure
2021-06-27 06:23:38 davros so a guy reaching for 64bit for UI.. probably hasn't done enough 3d programming
2021-06-27 06:23:48 jbg it seems like we are just constantly talking past each other
2021-06-27 06:23:55 jbg none of what you're writing is related at all to anything that I've said
2021-06-27 06:24:17 davros well you did suggest aat one point "why not use 64bit everywhere"
2021-06-27 06:24:19 jbg if you don't care to actually measure the impact of your choices, that's fine, but I'm not really interested in all this lecturing
2021-06-27 06:24:41 jbg I didn't actually say those words, but it's a good question, which you haven't answered
2021-06-27 06:24:47 davros this is overall strategy but if you want to measure its easy
2021-06-27 06:24:48 gggp what is the relation of Deref and RefCell
2021-06-27 06:24:59 jbg with actual data, you might find that it matters, but you apparently have none
2021-06-27 06:25:01 davros 64bit takes up twice the space, so it halves the amount of content you can store.
2021-06-27 06:25:08 jbg sigh
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2021-06-27 06:25:33 davros somewhere there is a precision/storage sweetspot. 8bit is not enough. 128bits is too much.
2021-06-27 06:25:47 davros it just so happens that for the vast majority of graphics use cases, that sweetspot is 32bit.
2021-06-27 06:26:03 davros YOU go do some measurements if you dont already know that.
2021-06-27 06:26:04 jbg gggp: there isn't much relation, can you elaborate the question?
2021-06-27 06:26:17 jbg davros: lol. I should go do some measurements about something I don't care about at all but which you are very angry about. OK
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2021-06-27 06:28:31 davros https://www.quora.com/Do-currently-available-GPUs-support-double-precision-floating-point-arithmetic this answer has some measurements. "as low as 3% performance on many desktop cards" (tahts because people use desktop cards for graphics not science, so they're optimized accordingly).
2021-06-27 06:28:46 davros ive never personally measured it
2021-06-27 06:28:52 davros i made a reasonable assumption
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2021-06-27 06:37:00 davros https://social.msdn.microsoft.com/Forums/en-US/2b190cfa-e221-4e91-b40c-c2a00aee4b36/float-vs-double-performance-on-arm?forum=winappswithnativecode good answer given here on the general issue aswell
2021-06-27 06:37:19 davros "In short: For good performance in C++, use float in all cases unless you actually need double."
2021-06-27 06:37:25 davros (he then goes on to explain more)
2021-06-27 06:38:29 gggp jbg why the book says the Rc<T> is used to share data ,
2021-06-27 06:38:46 jbg Rc and Arc are for shared ownership
2021-06-27 06:39:05 gggp smart pointer can not be used for sharing ?
2021-06-27 06:39:16 jbg what do you mean by "smart pointer"?
2021-06-27 06:39:17 j`ey Rc and Arc are smart pointers
2021-06-27 06:39:31 jbg there are several types of "smart pointer" in Rust
2021-06-27 06:39:40 gggp hmm ,what is the signature of Rc and Arc
2021-06-27 06:40:06 j`ey gggp: https://doc.rust-lang.org/std/rc/struct.Rc.html
2021-06-27 06:45:33 jbg for just sharing data though, a simple reference - &T - may be fine. you need Rc or Arc if you need shared ownership via refcounting, so the value stays alive as long as there is at least one owner
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2021-06-27 06:50:36 gggp wish I have not missed some msg
2021-06-27 06:51:33 jbg what was the last msg you saw
2021-06-27 06:52:08 gggp what is the enhance of Rc than Box
2021-06-27 06:52:31 jbg Box is just "an owned value on the heap"
2021-06-27 06:52:38 jbg Rc is "an owned value on the heap with reference-counting"
2021-06-27 06:52:54 jbg you can cheaply clone an Rc to get another Rc that points to the same value
2021-06-27 06:53:09 jbg and the value on the heap will not be dropped until all the Rcs that point to it have been dropped
2021-06-27 06:54:51 gggp thanks ,jbg
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2021-06-27 06:55:10 gggp when do I need to clone a Rc
2021-06-27 06:55:55 gggp multithreading ?
2021-06-27 06:56:00 jbg that's one example yeah
2021-06-27 06:56:36 jbg since the data you pass into std threads needs to be 'static lifetime, you can't just pass &T in, so Rc<T> (actually generally Arc<T>) is a good solution
2021-06-27 06:57:25 gggp ok
2021-06-27 06:57:45 gggp then what is the diff of RefCell ? BTW
2021-06-27 06:58:49 jbg RefCell is not really related. RefCell allows interior mutability by basically doing the borrow checking at runtime
2021-06-27 06:59:27 jbg so you can have a &RefCell<T> (note just &, not &mut), and you can call .borrow_mut() on it to get (something that derefs to) a &mut T
2021-06-27 07:00:25 jbg most Rust beginners don't need to work with RefCell
2021-06-27 07:00:49 gggp nice:)
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2021-06-27 07:56:39 gggp what is the diff between str and string object
2021-06-27 07:58:10 jbg gggp: you should take the time to read the rust book; it answers all the questions you're likely to be asking in here as you learn :)
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2021-06-27 07:58:19 jbg String is an owned string, &str is a borrowed string slice
2021-06-27 07:58:31 jbg analogous to Vec<u8> vs. &[u8]
2021-06-27 07:58:38 jbg https://doc.rust-lang.org/book/
2021-06-27 07:59:19 j`ey or like char* and std::string in C++
2021-06-27 07:59:35 bertptrs more like std::string_view and std::string
2021-06-27 08:00:34 j`ey sure if you use modern c++ :P
2021-06-27 08:01:20 gggp j`ey the char* make sense
2021-06-27 08:01:34 gggp nice explain
2021-06-27 08:01:49 gggp so str is native
2021-06-27 08:01:56 gggp premitive
2021-06-27 08:01:58 bertptrs no, not quite
2021-06-27 08:02:12 gggp ?
2021-06-27 08:02:35 bertptrs String "owns" the text, str refers to data that's stored somewhere else
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2021-06-27 08:04:16 jbg a String is basically a wrapper around a Vec<u8> that promises the bytes are valid UTF-8
2021-06-27 08:04:37 jbg a &str is like a wrapper around a &[u8] that promises the referenced bytes are valid UTF-8
2021-06-27 08:05:06 gggp how to get start address of str
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2021-06-27 08:05:13 gggp and lts length
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2021-06-27 08:06:51 bertptrs why do you need these
2021-06-27 08:07:08 gggp let ptr = story.as_ptr();
2021-06-27 08:07:08 gggp let len = story.len();
2021-06-27 08:07:38 jbg do you need to interop with C or something?
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2021-06-27 08:08:31 gggp yeah
2021-06-27 08:09:04 bertptrs str and String are terrible for C interop as they don't do 0 terminators
2021-06-27 08:09:14 bertptrs you'll want CString and Cstr
2021-06-27 08:10:43 gggp bertptrs : I have heard of this for the first time
2021-06-27 08:11:01 gggp rust str is not \0 terminated
2021-06-27 08:11:21 gggp where the book says this
2021-06-27 08:12:32 jbg https://doc.rust-lang.org/book/ch08-02-strings.html
2021-06-27 08:13:09 jbg &str is a pointer and a length
2021-06-27 08:13:34 jbg as for the C interop part, https://doc.rust-lang.org/nomicon/ffi.html#interoperability-with-foreign-code is relevant (you probably want to read that whole chapter)
2021-06-27 08:14:35 gggp is this ffi
2021-06-27 08:15:04 jbg sure: C code is "foreign" to rust and vice-versa
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2021-06-27 08:34:07 hflug Assume you have a struct A with a vector of B. Each B implements IntoIterator yielding C elements.
2021-06-27 08:34:08 hflug Is there an easy way to implement IntoIterator for A, so that the iterator produces the elements produced by each B consecutively?
2021-06-27 08:34:08 hflug I tried self.iter().map(B::into_iter).flatten(), but it strangely gives the error that C is not an iterator.
2021-06-27 08:35:22 jbg flatten just requires Self::Item: IntoIterator
2021-06-27 08:35:39 jbg so vec.iter().flatten() will be sufficient if the items in the vec implement IntoIterator
2021-06-27 08:35:57 hflug Aha, and they would implement it by returning an iterator with just themselves, right?
2021-06-27 08:36:05 jbg are they also iterators?
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2021-06-27 08:36:16 hflug No, they are basic elements, say integers
2021-06-27 08:36:29 jbg I'm a bit confused here
2021-06-27 08:36:37 jbg you said that the Vec contains items that implement IntoIterator
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2021-06-27 08:37:11 jbg the type within those iterators doesn't matter as long as they're all the same
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2021-06-27 08:38:11 jbg if you have Vec<T> where T: IntoIterator<Item = U>, then to get an Iterator<Item = U> you simply need to do the_vec.into_iter().flatten()
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2021-06-27 08:39:33 jbg if that doesn't work, you need to either read the resulting error message more carefully, or paste the whole error so someone else can read it carefully for you ;)
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2021-06-27 08:41:56 hflug Hm, let me try to create a minimal example, that's weird
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2021-06-27 08:48:46 hflug Ok, great, with a.vec_of_B.iter().flatten(), that works. Now, I was trying to implement IntoIter for A, writing into_iter(self) {self.vec_of_b.iter().flatten()}. What I think is my problem is the type IntoIter. What I have currently is type IntoIter = iter::Flatten<IteratorTypeCreatedByBIntoIter<'a>>, but this produces the error about U not being
2021-06-27 08:48:46 hflug an iterator
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2021-06-27 08:49:31 jbg can you put the code on playground? or at least paste the whole error rather than paraphrasing it
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2021-06-27 09:00:52 hflug Here is a minimal example: https://play.rust-lang.org/?version=stable&mode=debug&edition=2018&gist=1776469f88b382deb7d64bf2558db696
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2021-06-27 09:05:27 j`ey why is a default integer literal type (i32) needed?
2021-06-27 09:05:50 j`ey hm, just realised something like: for _ in (0..10) { ... }, would need a type
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2021-06-27 09:07:25 hflug In the actual code, B doesn't have a vector of i32, but a custom IntoIter that produces C. But the error is the same: C is not an iterator
2021-06-27 09:10:25 jbg hflug: have a look at the definition of std::iter::Flatten
2021-06-27 09:10:52 jbg pub struct Flatten<I> where I: Iterator, <I as Iterator>::Item: IntoIterator
2021-06-27 09:11:07 jbg the type parameter is the type of the iterator that it wraps
2021-06-27 09:12:03 j`ey meaning it should be: iter::Flatten<vec::IntoIter<B>>
2021-06-27 09:12:19 jbg yup
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2021-06-27 09:18:00 oaken-source Hey, me again. I managed to cross-compile a working rustc for my target platform, but when I try building tools (cargo) the linking step fails with missing libc.so.6 -- is there a way I can tell x.py where the libc.so for the target platform lives?
2021-06-27 09:18:27 oaken-source it seems to not pick up on the sysroot of the target compiler
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2021-06-27 09:21:40 oaken-source I tried adding the sysroot to LD_LIBRARY_PATH, but despite triggering a lot of rebuilds, this doesn't have the intended effect.
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2021-06-27 09:28:16 hflug @jbg j`ey Thanks for your help :) Got it working that way in the minimal example, but it throws the same error when I replace the vec iterator by a custom one: https://play.rust-lang.org/?version=stable&mode=debug&edition=2018&gist=470d4373be11f4abca2168d471073318 The type IntoIter = iter::Flatten<BIterator>; should be correct, no?
2021-06-27 09:29:12 hflug oops, that one is the correct one: https://play.rust-lang.org/?version=stable&mode=debug&edition=2018&gist=d21407190ea7d28b1b2566a8bc7ef443
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2021-06-27 09:32:20 _Vi Shall there be "Show THIR" action in play.rust-lang.org?
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2021-06-27 09:34:56 j`ey hflug: no you still want iter::Flatten<vec::IntoIter<B>>
2021-06-27 09:35:06 _Vi Cna there be THIR-based macros in Rust someday?
2021-06-27 09:35:10 hflug Oh right
2021-06-27 09:38:22 hflug yay, thanks, it works great now :=
2021-06-27 09:39:17 j`ey _Vi: probably not? I mean MIR and HIR arent stable at all, so im not sure i expect THIR to be
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2021-06-27 09:50:18 davros jbg just to clarify my anger earlier. the kind of attitude you displayed there is exactly why despite my warnings 5+ years ago, rust today has an awkward indexing situation.
2021-06-27 09:50:48 davros think you;'re so clever "oh you little person you didn't profile it did you"
2021-06-27 09:50:51 davros but you're missing the context
2021-06-27 09:51:16 davros you're puting yourself in my crosshairs for 5+ years of frustration on this
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2021-06-27 09:52:00 davros "well, change your world coordinates to 64bit aswell.. have you profiled it? do you know it wont be fast enough?" FUCKING STUPID
2021-06-27 09:52:23 davros YES LETS DOUBLE THE SIZE OF ALL OUR COORDINATES BECAUSE WE CAN'T BE ARSED MAKING A LIBRARY SELECT THE APPROPRIATE PRECISION
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2021-06-27 09:52:36 j`ey lol
2021-06-27 09:52:49 davros this moron seriously suggested
2021-06-27 09:53:02 davros that i should change my world meshes to 64bits to make using a 64bit ui library easier
2021-06-27 09:53:17 yourfate hmm, I can't use serde to serialize chrono::DateTime it seems?
2021-06-27 09:53:26 davros OF COURSE I DIDNT PROFILE IT BECAUSE I ALREADY KNOW THATS STUPID AND THATS WHY CONSUMER GPUS ARE OPTIMIZED FOR 32BIT
2021-06-27 09:54:01 davros people like that is why rust today has awkward 32/64bit issues
2021-06-27 09:54:01 j`ey davros: well either you have to use a 64bit ui lib, or you make that lib use 32 bits, or you make your own lib
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2021-06-27 09:54:14 davros sure there's plenty of 32bit ui libs
2021-06-27 09:54:26 davros i had this argumen twith the piston person aswell
2021-06-27 09:54:37 davros i already know by instinct 32bits is right
2021-06-27 09:55:08 j`ey you have to give better than that, to try get someone to change their library
2021-06-27 09:55:23 davros "it's a cross platform ui lib (oh i've only worked on intel desktop PCs, to me crossplatform means "windows+linux", what do you mean some embedded devices or GPUs dont have 64bit as fast as 32bit?)"
2021-06-27 09:55:59 davros this weirdness is why some people in games dont take rust seriously
2021-06-27 09:56:27 davros there's a certain "web-ness" that permeates it.. the fact someone doesn't just know this instincitcely indicates little experience of this domain
2021-06-27 09:56:37 davros so it makes them suspicious
2021-06-27 09:56:57 j`ey well then themselves dont know enough of rust as a domain soo :P
2021-06-27 09:56:59 davros in the web world people just lazily use 64bit everywhere
2021-06-27 09:57:16 davros its no issue because everything is hidden by network delays
2021-06-27 09:57:35 davros rust is a general purpose/systems language, the issue is *the target domain*
2021-06-27 09:58:15 davros here i know i can workaround but the fact these guys *didn't care about it* makes games people suspicious
2021-06-27 09:58:35 davros and i'm super-keen on rust by comparison
2021-06-27 09:58:43 * kpcyrd hides
2021-06-27 09:59:02 davros you make me look bad with this, when i try and push rust in the games world
2021-06-27 09:59:15 davros "huh ? they didn't care about THAT? what else might they have got wrong?"
2021-06-27 10:00:13 kpcyrd as long as it's not the std lib the games world can just stick to the crates that work best for them
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2021-06-27 10:01:22 kpcyrd (would be my naive assumption)
2021-06-27 10:01:26 j`ey kpcyrd: which is what they do with C++ too I believe
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2021-06-27 10:02:38 davros it wasnt' just that, its the broader context of that conversation
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2021-06-27 10:13:52 Midjak Hi, If I want the user input I can use stdin.read_line() . I need in my application merely wait the user press enter. Should I use stdin.read_line ? Or is there something to just wait user press enter without need to instatiate a `String` ?
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2021-06-27 10:16:12 kpcyrd Midjak: it depends if and how you want to handle certain cases
2021-06-27 10:17:30 kpcyrd like, what if the user presses a lot of other characters before pressing enter
2021-06-27 10:19:03 kpcyrd Midjak: the way with the least allocation overhead would be stdin.read(&mut buf), buf is simply an array of a few bytes of size
2021-06-27 10:19:46 kpcyrd but if you want to ask the user a few times to press enter and I hold down A for a while and then press enter it would confirm all at once
2021-06-27 10:20:03 Midjak I don't need what user type. It's just a way to stop the program. So I don't need to allocate something .
2021-06-27 10:20:37 kpcyrd if you define `let mut buf = [0u8; 8];` that doesn't allocate anything, it's on the stack
2021-06-27 10:21:11 Midjak I resolve my issue with stdin.read_line(&mut String::new()), but your solution is better thanks
2021-06-27 10:22:33 Midjak sorry for the "allocate" thing in fact I don't need anything to retieve what the user types. Just waiting for an input.
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2021-06-27 10:24:02 Midjak there is a handler attached to a midi port I just need the program wait the time needed for the device respond
2021-06-27 10:25:22 Midjak I am trying the buffer I think is lighter than a String::new()
2021-06-27 10:25:36 kpcyrd all good, don't worry :)
2021-06-27 10:26:08 Midjak word is important you are right
2021-06-27 10:26:22 jbg yourfate: the chrono crate has a serde feature you need to enable
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2021-06-27 10:32:06 Midjak works fine thx kpcyrd !
2021-06-27 10:32:31 yourfate jbg: <3
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2021-06-27 10:37:28 oaken-source hm, I can't seem to get cargo to link :/
2021-06-27 10:37:40 oaken-source in a cross-compiling scenario
2021-06-27 10:38:06 kpcyrd oaken-source: are you using external libraries?
2021-06-27 10:39:19 oaken-source I don't know, am I?
2021-06-27 10:39:31 oaken-source it's looking for libc.so when linking cargo
2021-06-27 10:39:43 oaken-source and it's not looking at the right places, it seems
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2021-06-27 10:40:49 oaken-source I think it's looking for libc.so for the target architecture, but it's not including the toolchain sysroo
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2021-06-27 10:41:42 w0x12ef_ Rust nightly not installed, please install it!
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2021-06-27 10:42:46 bertptrs no, I don't think I will
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2021-06-27 10:44:34 Midjak Do you know some GUI library for rust which is simple, light and work on OSX ?
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2021-06-27 10:45:35 jbg https://www.areweguiyet.com
2021-06-27 10:46:18 Lumpio_ Answer is no
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2021-06-27 10:46:35 bertptrs what's it with Rust ecosystem websites and requiring javascript for displaying basic stuff
2021-06-27 10:46:40 * bertptrs shakes fist at cloud
2021-06-27 10:46:45 Lumpio- It's going to take a very long while to get a GUI toolkit going that's on par with things like Qt/GTK/WPF/whatever
2021-06-27 10:47:39 jbg I don't recommend any of those shitty electron-based ones, but you can use GTK or Cocoa fairly pleasantly, and for cross-platform, conrod and druid are both interesting and maybe usable for simple stuff
2021-06-27 10:48:17 Sobek <jbg "I don't recommend any of those s"> How do you use cocoa in rust ?
2021-06-27 10:48:28 mike-burns gtk-rs is pretty good already.
2021-06-27 10:48:54 mike-burns Doesn't answer the macOS requirement, though. gtk-rs will work on macOS, but it will look like a GTK+ UI, not a macOS UI.
2021-06-27 10:49:12 kee Tcl/Tk can do native UIs.
2021-06-27 10:49:29 jbg Sobek: https://github.com/servo/core-foundation-rs/tree/master/cocoa/examples
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2021-06-27 10:50:09 kee Use ttk via tkinter via pyo3 to get easy cross-platform native UIs in Rust.
2021-06-27 10:50:17 jbg lol
2021-06-27 10:50:27 mike-burns The request was for a macOS UI, not cross-platform.
2021-06-27 10:50:32 Sobek <mike-burns "Doesn't answer the macOS require"> What about the Qt bindings ? Qt is pretty good with looking native iirc
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2021-06-27 10:50:43 jbg for a macOS UI, just use cocoa
2021-06-27 10:50:46 mike-burns Right.
2021-06-27 10:50:51 jbg the above crate is no doubt incomplete, but add more bindings as needed
2021-06-27 10:50:51 Sobek ^
2021-06-27 10:51:01 Midjak Well the main issue with gtk on osx is install gtk. I tried this for scala, but I didn't succeed to get it working
2021-06-27 10:52:11 Midjak ok let'try cocoa
2021-06-27 10:53:20 Midjak I don't know if it the simplest framework to learn but It is shipped with osx
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2021-06-27 10:55:04 Midjak For Qt I need to install Qt framework and I need something light. Qt is a very good framework for complexe application.
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2021-06-27 10:57:08 kee Midjak: UIs on Rust are hard. Cocoa is probably the easiest way to go, regardless of how complicated it is.
2021-06-27 10:58:30 jbg I did some toy things with the cocoa-rs and if you already know cocoa it's not that different from doing it in swift or obj-c tbh
2021-06-27 10:58:51 Midjak no I am new on Mac OSX
2021-06-27 10:59:00 jbg if you don't know cocoa it's a learning curve no matter the language, but if you're developing for macOS you should learn cocoa
2021-06-27 10:59:05 Midjak I am a Linux guy
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2021-06-27 10:59:27 Midjak I need Mac for music thing and switch to it for dev toor
2021-06-27 10:59:36 Midjak too*
2021-06-27 10:59:36 jbg making your app look and feel native on macOS is much easier with cocoa
2021-06-27 10:59:51 Midjak ok I am going to try
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2021-06-27 11:00:28 kpcyrd oaken-source: try https://github.com/rust-embedded/cross :)
2021-06-27 11:00:41 Midjak Anyway, I'll have to figure out how it works
2021-06-27 11:00:53 jbg I think oaken-source is trying to build rust for a new target, as opposed to cross-compile something written in rust
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2021-06-27 11:01:31 Midjak thank you all for your advices
2021-06-27 11:04:21 oaken-source yeah. I had no problem compiling rust itself, but cargo is giving me trouble.
2021-06-27 11:04:51 kee oaken-source: Do you really need cargo?
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2021-06-27 11:07:20 oaken-source kee: I need cargo to compile rust again natively on the platform I think
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2021-06-27 11:07:55 oaken-source I'm trying to cross-compile a compiler that I can use to compile a native one on the platform
2021-06-27 11:09:14 kee How long did it take you to get the compiler you've got?
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2021-06-27 11:10:06 oaken-source could you rephrase that?
2021-06-27 11:10:27 kee I assume you have a RISC-V compiler. How long did it take you to bootstrap that?
2021-06-27 11:10:38 oaken-source oh!
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2021-06-27 11:14:02 oaken-source I have a riscv64 gcc, that's not difficult. and riscv64gc is a supported rust target
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2021-06-27 11:14:02 oaken-source so I just started from the rust binaries that came with my distribution
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2021-06-27 11:14:02 kee Ah, okay. I thought you bootstrapped from the OCaml.
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2021-06-27 11:14:02 oaken-source no. I looked into that, but the early rust versions only worked on x86
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2021-06-27 11:38:53 davros crates.io .. does this only support distributing with sourcecode (i'd guess yes, r.e. tradeoff for running the ecosystem.. and maybe even for security reasons)
2021-06-27 11:39:11 j`ey yes
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2021-06-27 11:41:00 davros i suppose sourcecode obfuscation would be against the spirit of it (and quite possibly outlawed ?)
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2021-06-27 11:41:51 j`ey probably fine, but i guess people might not want to rely on that crate :P
2021-06-27 11:42:02 oaken-source let CS students write your code, and you get obfuscation for free :^)
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2021-06-27 11:45:47 jbaublitzzz so I'm struggling with higher rank trait bounds. I have a trait defined that requires the predicate for<'a> FromBytes<'a> to be true. my understanding of this is that this means that FromBytes<'a> must be implemented for all lifetimes. is that correct so far?
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2021-06-27 13:09:53 bertptrs yes
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2021-06-27 17:37:09 yourfate so, any good lectures on how I should organize my data for storing in a database? I'm using sled for a pet project (time tracking system)
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2021-06-27 18:01:07 kee yourfate: I don't have lectures,but store the data the same way you would in structs.
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2021-06-27 19:00:57 meltyness hmm... in terms of iterators -- should Next _really_ be returning a Result?
2021-06-27 19:01:28 meltyness cause it seems like one could iterate over a structure where None isn't necessarily the last result
2021-06-27 19:02:13 GreenJello meltyness, you can have an iterator of Option values
2021-06-27 19:02:27 GreenJello in which case .next() returns Option<Option<T>>
2021-06-27 19:03:27 meltyness I meant Option, but yeah -- that's kinda what I puzzled down to
2021-06-27 19:04:08 meltyness That way you wouldn't violate any of the assumptions of the std::Iterator methods
2021-06-27 19:04:59 GreenJello separately there's the case of "I don't have the next value *yet*" for which you need a futures::Stream instead of Iterator
2021-06-27 19:05:51 meltyness hmm
2021-06-27 19:05:55 GreenJello but with Iterator the (outer) Option is just saying if the iterator is exhausted yet or not
2021-06-27 19:07:25 meltyness I actually just re-read zip() and it's not clear that's the case, it looks like the assumption there is that it's per-execution
2021-06-27 19:08:58 kee The standard library doesn't assume iterators are fused.
2021-06-27 19:09:02 kee But it also doesn't assume they're not.
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2021-06-27 19:10:17 kee Speaking of iterators, I'm trying to select an (A, B, C, D) with methods like `a.iter_bs()`, and I'm finding myself with a lot of .flat_map(|(a, b)| b.iter_cs().map(|c| (a, b, c)))
2021-06-27 19:10:35 kee Is there a better way to do it? (Something like .zip_map, perhaps?)
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2021-06-27 19:23:17 meltyness so an iterable 4 tuple?
2021-06-27 19:24:30 kee Kind of.
2021-06-27 19:24:34 kee The first stage gets an iterable of a, which I use to get an iterable of iterables of b, but I want an iterable of (a, b).
2021-06-27 19:24:37 kee And so on.
2021-06-27 19:24:47 kee I'm fine with (((a, b), c), d) or something.
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2021-06-27 19:44:31 meltyness Is this example /really/ more efficient than a clone() ?
2021-06-27 19:44:32 meltyness https://doc.rust-lang.org/book/ch13-03-improving-our-io-project.html#using-iterator-trait-methods-instead-of-indexing
2021-06-27 19:45:01 Arnavion A clone of what
2021-06-27 19:45:22 meltyness a string slice
2021-06-27 19:45:29 Arnavion What string slice
2021-06-27 19:45:34 Arnavion std::env::args() gives you an iterator
2021-06-27 19:46:31 j`ey Arnavion: https://doc.rust-lang.org/book/ch13-03-improving-our-io-project.html#removing-a-clone-using-an-iterator
2021-06-27 19:46:33 meltyness It seems like when you call args.next() the Result you receive must make a clone of the string it found
2021-06-27 19:46:59 meltyness since it has Result<str> and not Result<&str>
2021-06-27 19:47:11 meltyness ...right? hm
2021-06-27 19:47:20 j`ey I think you mean Option<String>
2021-06-27 19:47:35 Arnavion j`ey: That supposes that something already created the str slice
2021-06-27 19:47:40 danieldg env::args does freshly clone the argument every time
2021-06-27 19:47:55 danieldg std::env is really inefficient as an API
2021-06-27 19:48:05 Arnavion kee: You can split the flat_map() into multiple ones for readability, but it'll still be as long as that. AFAICT itertools doesn't have anything to help either
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2021-06-27 19:48:50 meltyness danieldg thanks -- the tutorial highlights that clone is inefficient somehow, but based on the types I'm looking at this implementation doesn't fix the copy either.
2021-06-27 19:48:54 j`ey Arnavion: bad timing :P
2021-06-27 19:49:07 Arnavion Welp
2021-06-27 19:49:42 danieldg cloning a String is expensive, moving it is not. String is not Copy, so can't do that
2021-06-27 19:49:57 danieldg copying a reference to a String (str) is also cheap
2021-06-27 19:50:02 Arnavion meltyness: It has strictly one less copy than the code at the top of that page
2021-06-27 19:51:03 Arnavion meltyness: Enumerating an Args creates one copy (from what libstd holds internally). The code at the top of the file then collect()s it into a Vec, but then uses it as a &[String] (???), and is thus forced to clone() a second time
2021-06-27 19:51:49 Arnavion I have no idea why that code is written as it is. Even if it didn't want to use the iterator, it could've taken the Vec<String> so that it could remove owned Strings from it
2021-06-27 19:52:38 j`ey Arnavion: probably just to try show diff ways of writing things? dunno
2021-06-27 19:52:56 Arnavion (ofc you can't pop_front() from a Vec, so you'd still have to do .into_iter().next(), which would be even more pointless because then you might as well have used the original std::env::args() iterator)
2021-06-27 19:54:25 Arnavion btw std::env::args(), just like its cousin std::env::vars(), is a great way to crash your program because it ended up getting non-utf8 input. Consider using the _os() versions instead and handling the failed conversion to String manually
2021-06-27 19:59:16 davros struct Foo{ a:A,b:C} {let foo:Foo=.. { let x=&mut foo.a /* is foo.b useable as an immutable borrow here? or does &foo.a freeze *the whole of foo**/}}
2021-06-27 19:59:31 Arnavion Yes it is
2021-06-27 19:59:38 davros ok i kind of hoped so
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2021-06-27 20:00:23 Arnavion If it was impl Foo { fn a(&mut self) -> &mut A { &mut self.a } } then the entire foo would've been locked
2021-06-27 20:00:43 davros my scenario is like that.. I had some seperation that I was hoping was overkill, which i've simplified out. a master object that has some parts that are mutable/immutable in different areas of the program.
2021-06-27 20:01:49 davros i wonder if i had some misconceptions from a very early version
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2021-06-27 20:02:10 davros (which led me to overcomplicate my architecture around that.. all cleaned up now..)
2021-06-27 20:02:45 davros there's parts where i will want to take advantage of parts of the 'Foo' being immutable to read in parallel , which i'm not doing yet
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2021-06-27 21:45:27 db48x std::env doesn’t need to be ultra–efficient
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2021-06-27 21:46:22 db48x your argument list and environment variables top out at a few kilobytes. You’re going to process it once and then you’re done
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2021-06-27 22:01:43 * rk4 has a flashback to digging into just how big env vars could be, when people started using them to pass in lists of customers
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2021-06-27 22:02:17 db48x heh
2021-06-27 22:02:26 db48x ok, in any sane environment…
2021-06-27 22:04:33 db48x actually, now that I think back on it, there was a system at the internet archive that creates image thumbnails of videos, and I think it base64 encodes the thumbnail and passes it along on the command line
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2021-06-27 22:05:08 db48x I decided not to get involved in that one
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2021-06-27 23:26:10 gggp let story = "Once upon a time...";
2021-06-27 23:26:16 gggp then what is Ok(story)
2021-06-27 23:27:24 Mutabah A `Result<&'static str, _>`
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2021-06-27 23:30:53 gggp what is the relation of Result and Option
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2021-06-27 23:34:15 jeho love it when I can solve these advanced problems using Rust on hackerrank and other sites like that =)
2021-06-27 23:34:16 Mutabah `Result` is for something that can fail, `Option` is for when something may not exist
2021-06-27 23:34:35 jeho just solved one that required implementing a fenwick tree
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2021-06-27 23:36:07 jeho if you come from c or java, Result is sort of like indicating a function could throw an exception, while option is sort of like indicating the function could return a valid pointer or null
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2021-06-27 23:37:00 gggp what is zk proof rollup
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2021-06-27 23:37:31 jeho zero kost?
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2021-06-27 23:58:02 db48x zero knowledge, probably
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2021-06-28 00:03:11 SamuelMarks hi
2021-06-28 00:03:34 * SamuelMarks has an offtopic question, is there a Rust channel for that?
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2021-06-28 00:14:07 gggp zero knowledge proof ,how to do
2021-06-28 00:16:19 jeho I have zero knowledge
2021-06-28 00:16:49 jeho maybe it's another way of saying idiot proof
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2021-06-28 00:18:01 SamuelMarks gggp Coq?
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2021-06-28 02:28:59 Guest21 hi, I want to move target folder outside of source directory. I tried CARGO_TARGET_DIR but it seems instead of creating a folder for every project it just writes every artifact into the same folder. How can I fix this
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2021-06-28 02:53:43 jbg set CARGO_TARGET_DIR differently for each project you are building
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2021-06-28 02:54:43 jbg the meaning of that environment variable is "put the built artifacts in this folder". cargo doesn't have a concept of a global parent dir for built artifacts, so if you want that you'll need to arrange it yourself
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2021-06-28 03:04:59 Guest21 real bummer, thanks for the answer
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2021-06-28 03:25:48 osa1 proptest does not show the failing test inputs when a test fails, any ideas why? I'm using the default config. I don't see any fields in the config for showing failing inputs https://altsysrq.github.io/rustdoc/proptest/1.0.0/proptest/test_runner/struct.Config.html
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2021-06-28 04:18:47 _Vi Can there be something like `safe { }` blocks within `unsafe { } ` blocks, for auto-generated code, which includes user snippets, to be checked for unsafety more precisely?
2021-06-28 04:19:28 db48x there isn’t, but you could write an RFC
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2021-06-28 04:21:17 kron _Vi: if it's generated code, can't you generate safe functions and put the user code in that, then call them from unsafe code?
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2021-06-28 04:28:49 ssbr_ kron: the type of the function can be annoying.
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2021-06-28 04:30:26 kron what about closures then?
2021-06-28 04:31:16 ssbr_ kron: closures can't be polymorphic
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2021-06-28 04:31:56 ssbr_ like idk how common it is, but definitely some macros could benefit from this.
2021-06-28 04:32:41 kron yeah, i'm not arguing that it's completely identical, just wondering if these could work as a workaround that's available now
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2021-06-28 04:33:52 ssbr_ yep, they should frequently be able to work
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2021-06-28 04:38:31 Sobek Alternatively, use a much smaller unsafe block before and after the safe block ?
2021-06-28 04:39:37 * Sobek < https://libera.ems.host/_matrix/media/r0/download/libera.chat/add385fe55abc4d110f65c6476e3e9141cd6b01c/message.txt >
2021-06-28 04:39:52 Sobek should be equivalent to
2021-06-28 04:40:40 * Sobek < https://libera.ems.host/_matrix/media/r0/download/libera.chat/f0fe7dbea2ba6fa3cf0c215503cc6c633a334677/message.txt >
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2021-06-28 04:53:17 ssbr_ I know of a place that doesn't work, but it's very specific (macro which evaluates to a materialized temporary)
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2021-06-28 08:52:36 yuri6037 Hi, I have a question related to the log crate. I need a special logger which requires mut self access. Is there a way to hack a &mut self into a function which only takes &self?
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2021-06-28 08:53:12 Lumpio- You could use a Mutex
2021-06-28 08:53:15 Sobek A mutex ?
2021-06-28 08:53:27 Lumpio- (Or e.g. RefCell in the general case, but Log requires Sync)
2021-06-28 08:53:34 yuri6037 Obviously I cannot change the definition of the trait. Unfortunatly the dev of the crate forced &self! (https://docs.rs/log/0.4.14/log/trait.Log.html)
2021-06-28 08:53:44 Sobek Race condition ^^'
2021-06-28 08:54:01 Lumpio- Yeah well they also force Sync because they want to leave synchronization up to the loggers
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2021-06-28 08:55:31 yuri6037 How would you turn self into mut self using a RefCell?
2021-06-28 08:55:46 ssbr yuri6037: you can always add interior mutability (using e.g. RefCell, Mutex) for the things you store inside self
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2021-06-28 08:57:19 yuri6037 Is there some kind of optimized threaded queue or do I have to write this myself?
2021-06-28 08:57:47 ssbr yuri6037: look at the example at the top of https://doc.rust-lang.org/std/sync/struct.Mutex.html -- lock lets you get a mut reference to the thing inside the mutex. For RefCell, it'd be borrow_mut ( https://doc.rust-lang.org/std/cell/struct.RefCell.html )
2021-06-28 08:57:50 kee yuri6037: std::sync::mpsc::channel I think
2021-06-28 08:58:00 ssbr man this is moving faste rthan I can copy paste links huh.
2021-06-28 08:58:13 Sobek As in a queue that you can insert into from several threads and pop from several threads ? (Typically used for producer + consumers).
2021-06-28 08:58:18 Lumpio- Also you can't put RefCell in a Sync type so you'll need that Mutex
2021-06-28 08:58:23 Lumpio- As I said before.
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2021-06-28 08:58:48 yuri6037 then it might be better to create a single logging thread which polls a threaded queue
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2021-06-28 08:59:28 yuri6037 make the logger do nothing except redirecting to a threaded queue then have a special thread which runs in background and pops the queue
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2021-06-28 09:02:51 yuri6037 kee: Thanks for std::sync::mpsc::channel. I'm not sure this is gonna work: does "impl<T> !Sync for Sender<T>" mean "not Sync"?
2021-06-28 09:03:25 kee yuri6037: Yes, but it's send.
2021-06-28 09:03:32 kee .clone() the sender.
2021-06-28 09:03:42 kee It just means you can't Send references.
2021-06-28 09:04:29 yuri6037 yeah but then you hit the "Sync" part of the Log trait.
2021-06-28 09:04:45 yuri6037 except if the Clone function is thread safe
2021-06-28 09:04:47 Lumpio- Yeah mpsc Senders must be owned by one thread
2021-06-28 09:05:28 yuri6037 That's what I thught it's only usefull if you know in advance what are the sender threads. Well turns out here theres no way to know that
2021-06-28 09:05:42 kee Well…
2021-06-28 09:05:50 kee You could have a reciever of senders.
2021-06-28 09:06:21 kee Oh, that's !Sync too, never mind.
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2021-06-28 09:06:58 yuri6037 Then I need a replacement to Sender which is Sync. Is there a crate for that?
2021-06-28 09:07:24 kee I found an unanswered Stack Overflow question asking the same thing; does that help?
2021-06-28 09:07:25 yuri6037 receiver does not matter as only one thread which I know and control will own Receiver however the Sender is shared
2021-06-28 09:08:19 kee In theory you could have a pool of Senders.
2021-06-28 09:08:28 yuri6037 Well I can write this naively myself with a mutex if absolutely needed but if there's an existing lib that does this this would be good.
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2021-06-28 09:14:07 kee yuri6037: parking_lot_mpsc has the !Sync lines commented out.
2021-06-28 09:15:52 Alexendoo In std SyncSender is Sync, crossbeam channels are also, but there's nothing wrong with just using a mutex here
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2021-06-28 09:16:32 Alexendoo It's not naive, in fact stdout is behind a mutex for example
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2021-06-28 09:17:56 yuri6037 I know I can use a mutex. You could avoid locks with memory barriers and a bounded lossy channel (a ring buffer in other words)
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2021-06-28 09:20:52 yuri6037 Nice thanks about crossbeam I couldn't remember the name of the crate I already used which provided a lot of threading features
2021-06-28 09:21:31 yuri6037 I'll use crossbeam_channel it's Sync
2021-06-28 09:21:58 yuri6037 and I'm already familiar with this crate
2021-06-28 09:22:45 Sobek Quick question yuri, how does the lockless solution works (with barriers and ring buffer) ?
2021-06-28 09:23:05 Lumpio- Oh SyncSender exists in std, try that?
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2021-06-28 09:24:24 db48x printing via lockless ring buffer would be a nice crate, but possibly a bit complex for the standard library
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2021-06-28 09:28:47 cehteh dont overrate the lockless craze. it comes with a price, which means the normal uncontended cases costs considerably more than a lock
2021-06-28 09:30:43 Sobek (It looks like the bridge might have some lag, apologises for that)
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2021-06-28 09:37:00 yuri6037 Sorry computer crash
2021-06-28 09:40:00 la_mettrie (you didn't miss anything)
2021-06-28 09:44:22 kee cehteh: Sometimes. In other cases, lockless is strictly better – it depends entirely on the particulars of the implementations.
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2021-06-28 09:47:05 yuri6037 Sobek: the concept is something like: allocate a block of memory of a fixed size and NEVER reallocate it (otherwise it's unsafe and needs mutex to be safe). Then everytime you read and write just don't forget to issue the memory barrier to force the system to synchronize with RAM
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2021-06-28 09:47:35 cehteh kee: lockless hass its advantages, esp when you need latency gurantees
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2021-06-28 09:48:49 gggpkm how to do identity proof of hash function
2021-06-28 09:48:51 yuri6037 that's the basic concept. You may need additional atomics to control the pointers in the buffer (Intel x86_64 already guarentees you 64 bit int atmocity given 8 multiple alignment
2021-06-28 09:49:38 yuri6037 I think AARCH64 does have some atomic instructions that can permit you to read and write 64 bit ints atomically
2021-06-28 09:50:37 cehteh i wanted (didnt yet) experiment with lock chaining: imagine Mutex<VecDeque<Mutex<&str>>> ringbuffer; you obtain the outer Mutex to gain access to the inner (head or tail) and drop the outer lock asap, then you have very little contention on the ringbuffer
2021-06-28 09:50:38 yuri6037 But the memory barrier is a platform dependent thing which I'm not even sure Linux has. I know Windows have it
2021-06-28 09:51:19 cehteh i bet/guess that could outperform an lockless implementation in a lot use cases
2021-06-28 09:52:05 yuri6037 Never used memory barriers on any Posix system.
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2021-06-28 09:53:26 jbg yuri6037: https://www.kernel.org/doc/Documentation/memory-barriers.txt
2021-06-28 09:55:19 Sobek And the drawback of this method is that two threads might try writing at the same time and may overwite each other output ?
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2021-06-28 09:57:30 yuri6037 ah yeah forgot to mention it's only lockless for single thread write single tthread read
2021-06-28 09:58:55 yuri6037 But yeah if you use it accross more than 2 threads or use the read end in the thread for the write end you may get nice random memory bugs...
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2021-06-28 10:00:09 yuri6037 oh and by the way here is why I got computer crash. In fact it's more of a f*** *** NVIDIA kernel: nvidia 0000:01:00.0: can't change power state from D3cold to D0 (config space inaccessible)
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2021-06-28 10:00:41 yuri6037 and then we've got a nice GPU has fallen off the bus!!
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2021-06-28 10:08:58 jbg f*** Nvidia
2021-06-28 10:09:16 jbg them possibly buying ARM makes me so sad
2021-06-28 10:09:28 gggpkm_ how to identify the hash algorithm from the hash?
2021-06-28 10:09:36 jbg gggpkm_: in general, you can't
2021-06-28 10:09:51 gggpkm_ what do you mean
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2021-06-28 10:09:59 gggpkm_ I need uniqueness proof
2021-06-28 10:10:09 jbg are you aware that you're in ##rust?
2021-06-28 10:10:21 gggpkm_ rust is ok
2021-06-28 10:10:30 jbg your last several questions have nothing to do with rust though
2021-06-28 10:10:44 jbg (and it's better than ok! but fine.)
2021-06-28 10:11:07 gggpkm_ yep
2021-06-28 10:12:31 gggpkm_ jbg, iF identity uniqueness cannot get proved , blockchain can not work
2021-06-28 10:12:49 jbg this is not the channel to learn how blockchain works
2021-06-28 10:12:54 jbg I'm sure there are channels for that
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2021-06-28 10:22:32 Tv_ is there any nice way to control main while still using #[test]? i'd like to make a tests/foo.rs that skips *all* tests unless conditions are right, so i don't need to remember to annotate every test
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2021-06-28 10:26:05 cehteh what do you mean by that?
2021-06-28 10:26:25 cehteh usually your test has to set up everything it needs, it shouldnt rely on other tests
2021-06-28 10:27:10 cehteh when you have a bin crate .. i recently made a some test infrastructure for that, maybe you like that (running the binary you build in a test environment)
2021-06-28 10:27:17 Tv_ cehteh: "yes, test, you are now running in a disposable VM where it is safe for you to mess with important things"
2021-06-28 10:28:12 cehteh not that far as running in a container, CI may do that already anyway<
2021-06-28 10:28:26 cehteh anyway i dont get your problem
2021-06-28 10:28:36 Tv_ the point is to never run the dangerous stuff with just `cargo test`
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2021-06-28 10:28:52 cehteh you want to run a test function but that depends on other things set up properly?
2021-06-28 10:29:25 Tv_ imagine you want to write an integration test against specific behavior of something like sshd
2021-06-28 10:29:35 cehteh dangerous is in the eye of the beholder, there isnt anything in cargo that prevents you from that
2021-06-28 10:30:06 Tv_ you don't want your regular `cargo test` to mess with system daemons, and anyway it won't be authorized to
2021-06-28 10:30:16 cehteh when you want to do so then i think you rather use a CI from the outside which fires up a container for the test
2021-06-28 10:30:25 cehteh yes
2021-06-28 10:30:44 Tv_ yeah, this is the part i want to ship inside such a disposable environment, to actually perform the test
2021-06-28 10:31:03 cehteh then use some CI
2021-06-28 10:31:14 Tv_ *sigh*
2021-06-28 10:32:53 j`ey yeah i dont think you can control main() for tests
2021-06-28 10:32:57 ssbr Tv_: you don't need to annotate *every* test, FWIW. That's what macros are for >:)
2021-06-28 10:33:37 ssbr (and/or a cfg on the whole test module)
2021-06-28 10:34:37 Tv_ https://crates.io/crates/wraptest looks like roughly the right thing
2021-06-28 10:34:57 Tv_ ssbr: and yes, macros written by others would be a fine solution ;)
2021-06-28 10:35:02 cehteh Tv_: i made https://crates.io/crates/bintest and https://crates.io/crates/testcall to run your program (main) from a test, but by itself that has no isolation layer, it just run the tests and instructs your program to do whatever it does
2021-06-28 10:35:11 Tv_ is there way to get the effect of #[ignore] from inside the test function?
2021-06-28 10:35:49 Tv_ cehteh: yeah. i have the isolation layer, i'm looking for a convenient way to have stuff in my source tree that doesn't trigger explosions until told to
2021-06-28 10:36:43 cehteh isnt that what tests commonly do already :)
2021-06-28 10:37:02 Tv_ cehteh: i want a subcategory of tests that isn't safe to run normally as part of `cargo test`
2021-06-28 10:37:18 Tv_ and/or would fail because they try to do things only root can do, etc
2021-06-28 10:37:25 cehteh AAAH
2021-06-28 10:37:48 cehteh iirc you can do that with normal features
2021-06-28 10:38:04 ssbr Tv_: yes, this sounds like a use for cfg on the whole test module and features
2021-06-28 10:38:40 cehteh #[test] #[feature(dangerous-test)] or somehow like that
2021-06-28 10:38:59 Tv_ maybe that is the easiest way
2021-06-28 10:39:10 cehteh i tihnk so
2021-06-28 10:39:37 Tv_ what i've seen about features is that they're visible to importers, which makes them sound like somewhat of the wrong tool for internal things
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2021-06-28 10:40:46 ssbr Tv_: "visible to importers"?
2021-06-28 10:40:55 ssbr I don't know what that means.
2021-06-28 10:41:09 j`ey to people using the crate
2021-06-28 10:41:14 Tv_ ssbr: as in serde = { version = "1.0.126", features = ["derive"] }
2021-06-28 10:42:17 j`ey Tv_: not perfect, but i think its cleaner than trying to make it work by magic
2021-06-28 10:42:34 ssbr Tv_: Ah. Yes, but OTOH they'd have no reason to specify a feature that only does something to tests.
2021-06-28 10:42:55 Tv_ j`ey: https://crates.io/crates/wraptest seemed reasonably clean, but i didn't see a way to neatly skip the tests, just "return" and make them nops
2021-06-28 10:43:30 Tv_ a custom version of that and something like #[ignore] would look reasonably clean to me -- but more work than using a feature, likely
2021-06-28 10:45:52 cehteh iirc you can define customs things, dont have the right syntax in mind but something like test-enabled and then cargo test --config tests-enabled=dangerous-tests (doc shows thats unstable)
2021-06-28 10:46:35 cehteh when you settle on that unstable thing (check discussion about if there is a hint that it will be finalized soon) then you can make this pretty nicely
2021-06-28 10:47:28 cehteh otherwise nothing prevents you on just normal features, actually i used that because some tests need to be in sync with features enabled, testing that feature code
2021-06-28 10:47:58 Tv_ cehteh: do you mean `cargo test --features`?
2021-06-28 10:48:07 Tv_ oh there's --config K=V too
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2021-06-28 10:48:08 cehteh yes
2021-06-28 10:48:27 Tv_ cehteh: not sure what unstable thing you mean, then
2021-06-28 10:48:42 cehteh --features is just a short for --config features=value
2021-06-28 10:48:43 cehteh iirc
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2021-06-28 10:51:22 cehteh also #[ignore] may work and name your tests somewhat semantically fn foo_dangerous() .... when you run cargo tests you can provide <TESTNAME> and if i am not wrong that has some matching rules
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2021-06-28 10:51:52 Tv_ okay tests/foo.rs with #![cfg(feature="dangerous-test")] makes normal runs think the file has 0 tests, good enough with some documentation
2021-06-28 10:52:28 cehteh --test name...
2021-06-28 10:52:28 cehteh Test the specified integration test. This flag may be specified multiple times and supports common Unix glob patterns.
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2021-06-28 10:52:51 Tv_ then i can do cargo test --features dangerous-test --no-run, ship the compiled executable to the sandbox, and run it there
2021-06-28 10:53:09 cehteh cargo test --tests *dangerous ...
2021-06-28 10:53:14 Tv_ cehteh: i looked at ignore for a while but was scared of --test '*'
2021-06-28 10:53:15 cehteh or that
2021-06-28 10:53:19 cehteh anyway there are plenty options
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2021-06-28 10:54:13 cehteh either way what are 'dangerous' tests .. i rather consider to filter expensive testes, but test shouldnt be dangerous but fail safe as well
2021-06-28 10:55:14 Tv_ cehteh: e.g. an integration test that wants to restart a system service to see how the client copes with that
2021-06-28 10:55:56 cehteh unless you rewrite coreutils in rust and want to test if rm -rf preserves :)
2021-06-28 10:56:30 cehteh does the test even have enough privileges to restart the service?
2021-06-28 10:56:47 Tv_ that's the point, it'll be run as root inside the disposable vm
2021-06-28 10:57:10 cehteh then its not dangerous :)
2021-06-28 10:57:23 Tv_ the test is dangerous, and only contained by the disposability
2021-06-28 10:57:34 Tv_ but i need a way to build the test, as part of my source tree
2021-06-28 10:57:56 cehteh :)
2021-06-28 10:58:06 Tv_ and without root, it would be a failing test, which is.. unhelpful.. to run from cargo test
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2021-06-28 10:58:34 cehteh ok i see the point
2021-06-28 10:59:37 cehteh would be cool when someone invents a 'cargo container' in a mostly portable way so that one just can run 'cargo container test'
2021-06-28 11:00:05 Tv_ oh i want full control of what the disposable vm contains, and already have that part
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2021-06-28 11:00:15 cehteh with a bit config bits for the container and support for different container envs on different oses
2021-06-28 11:00:32 cehteh yeah just talking to myself :)
2021-06-28 11:01:28 Tv_ it would be cool to have a "transport" to the actual tests, where the transport gets to manage the disposable vm construction, lifetime, etc, but test results would get transported back to `cargo test`
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2021-06-28 11:03:05 Tv_ e.g. go has -exec flags that let you do things like "anything you're about to run, run via this wrapper", which means you can run unit tests even in cross-compilation scenarios by doing qemu or ssh in the wrapper
2021-06-28 11:03:21 Tv_ (but that doesn't have the right amount of configurability for this need, either)
2021-06-28 11:03:53 j`ey cargo has that
2021-06-28 11:04:08 j`ey a bit
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2021-06-28 11:04:38 Tv_ j`ey: oh? i haven't stumbled on such? give me something to search
2021-06-28 11:05:04 j`ey theyre called test runners.. but i cant find the docs
2021-06-28 11:05:26 Tv_ https://github.com/rust-lang/cargo/issues/1411 ?
2021-06-28 11:05:45 j`ey yeah
2021-06-28 11:06:51 Tv_ yeah interesting but way too coarse-grained for this
2021-06-28 11:07:06 j`ey yeah ;/
2021-06-28 11:07:34 Tv_ i *could* always have a runner, and then make the runner understand when to do something... but features should work just fine
2021-06-28 11:09:07 kee Is there a version of flat_map that zips each of the inner things with clones of the items from the original iterator?
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2021-06-28 11:10:21 kee I want to do as.something(A::iter_bs) and get an iterator of (a, b), and the only way I've found is horrible nested iterators.
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2021-06-28 11:27:03 jbg isn't that quite easy by composing existing iterator adapters?
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2021-06-28 11:27:27 jbg generally std doesn't include iterator adapters that are just compositions of existing ones (with a few exceptions_
2021-06-28 11:28:12 kee jbg: It is, but doing that composition in my code is awkward.
2021-06-28 11:28:36 kee I could use a macro, but that'd be even worse.
2021-06-28 11:28:38 jbg you could extract it to an iterator adapter of your own
2021-06-28 11:29:01 jbg I don't see any need for a macro
2021-06-28 11:29:10 kee How?
2021-06-28 11:29:13 jbg just write a trait and impl it for Iterator
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2021-06-28 11:29:44 kee You can't return impl Iterator in traits, though.
2021-06-28 11:29:59 jbg you don't return impl Iterator, you return a concrete type (the type of your iterator adapter)
2021-06-28 11:30:03 jbg you could look at itertools for examples
2021-06-28 11:30:26 kee Okay, that's doable if I use a function instead of a lambda. (Didn't think of that.) Thanks.
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2021-06-28 11:37:33 Arnavion <Arnavion> kee: You can split the flat_map() into multiple ones for readability, but it'll still be as long as that. AFAICT itertools doesn't have anything to help either
2021-06-28 11:37:43 Arnavion (from last time you asked, but you ping-timeout'd without seeing it)
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2021-06-28 11:42:04 kee Arnavion: Thanks. I haven't been able to find anything either.
2021-06-28 11:42:11 kee I guess I'll have to make one.
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2021-06-28 12:04:39 cehteh anyone has good understanding of the regex lib (without me trying) ... are named captures appear in the numbered captures or are they mutally exclusive?
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2021-06-28 12:16:51 jbg cehteh: the docs are *really* clear about that
2021-06-28 12:17:05 jbg "The 0th capture always corresponds to the entire match. Each subsequent index corresponds to the next capture group in the regex. If a capture group is named, then the matched string is also available via the name method."
2021-06-28 12:17:21 jbg it took me less time to find that than it took me to type "the docs are *really* clear about that"
2021-06-28 12:17:36 cehteh doh .. i overseen that
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2021-06-28 12:26:30 Tv_ cehteh: as a fellow english-as-second-language person, overlooked; oversee means to manage, keep track of, supervise
2021-06-28 12:26:56 cehteh haha ok :)
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2021-06-28 12:31:14 pounce So I'd like to sort a vec<T> by a key function `fn(&T) -> Result<K,_>`, failing if an error is occured. is there any way to do this idiomatically?
2021-06-28 12:31:49 pounce I'm thinking I could transform it into an iterator, map to a tuple of the value and key, collect back into a result, sort, and map out the key, but that seems inefficient and silly
2021-06-28 12:32:17 jbg you want to handle the failure gracefully, like, return a Result from the fn that is doing this?
2021-06-28 12:32:24 pounce yeah
2021-06-28 12:32:27 bertptrs sort_by_key, with a lambda that sets an external flag if it ever fails
2021-06-28 12:32:33 jbg yeah
2021-06-28 12:32:59 Tv_ that wouldn't do early abort though
2021-06-28 12:33:03 pounce yeah
2021-06-28 12:33:05 jbg and returns some ostensibly-valid sort key, but then you check the flag after and fail
2021-06-28 12:33:10 jbg is early abort important?
2021-06-28 12:33:13 jbg it wasn't mentioned
2021-06-28 12:33:46 pounce i suppose it doesn't seem very graceful, but a solution nonetheless
2021-06-28 12:33:56 jbg early abort means a Result-aware sort_by_key which doesn't exist in std
2021-06-28 12:34:09 pounce or collecting a few times
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2021-06-28 12:34:32 bertptrs you could copy the current sort code and adapt it as needed, but that's even less elegant. Beautiful as Orson Peters' code is
2021-06-28 12:34:58 j`ey bertptrs: any relation? :P
2021-06-28 12:35:18 bertptrs not that I'm aware of but I have met the guy
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2021-06-28 12:47:10 Midjak Hi ! Is there something to iterate by group of n elements from an iterator ? returning an iterator on each 5 elements by instance
2021-06-28 12:47:38 bertptrs chunks() and chunks_exact respectively
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2021-06-28 12:49:04 Midjak thanks bertptrs I am looking this
2021-06-28 12:49:19 j`ey thats on a slice not an iterator
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2021-06-28 12:49:32 Midjak hum yes
2021-06-28 12:49:40 bertptrs ah I forget, that makes sense
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2021-06-28 12:50:43 bertptrs itertools has batching, maybe you want that?
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2021-06-28 12:51:01 Midjak well I am starting from a vector so it's good
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2021-06-28 12:51:49 bertptrs good, because batching did something diff3erent. itertools::chunks appears to do what's asked
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2021-06-28 12:52:14 Midjak yes I saw that in my search result earlier
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2021-06-28 12:52:40 Midjak I going to try from slice and switch to itertools if needed
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2021-06-28 14:21:27 georgemp is it considered ok to use +nightly to produce release builds? i understand that new featuers are tested out in the nightlies, but, does that mean i could potentially end up with incorrectly compiled code (i am assuming not here)?
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2021-06-28 14:22:56 j`ey georgemp: it's unlikely
2021-06-28 14:23:10 j`ey but even the stable compilers can create incorrect code..
2021-06-28 14:23:21 bwidawsk Is there a design pattern for printing things differently based on say output type, json vs. human readable, or debug vs. non-debug?
2021-06-28 14:24:01 georgemp j`ey: thanks. not something i should particularly worry about i guess (unless i see some issue)
2021-06-28 14:24:10 j`ey yup
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2021-06-28 14:25:17 GreenJello bwidawsk, you typically implement a trait for each
2021-06-28 14:25:26 GreenJello Debug, serde::Serialize, etc.
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2021-06-28 14:27:11 GreenJello if it doesn't fit into an existing trait, then define your own. If you need code to be generic over the output type, you can use an enum of output types, and a function that matches on that to produce a string
2021-06-28 14:27:16 bwidawsk GreenJello: as an example, my application has a command to generate a list of things. When --json is passed, I want the list to be printed as JSON. Obviously, I can use an if/else or match for that, but there are several places in ymy app for stuff like this
2021-06-28 14:28:01 Sobek <georgemp "is it considered ok to use +nigh"> Firefox has a few head-aches due to non stabilised yet features they need, iirc, specifically beacuse they have good reasons not to use a nightly.
2021-06-28 14:28:08 bwidawsk GreenJello: yeah, the function/enum was where I was going, but I'd need to pass the globalstate, and type with each call
2021-06-28 14:28:11 bwidawsk seems like a lot of typing
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2021-06-28 14:30:37 georgemp Sobek: hmm...hopefully, i don't run into those :) it looks like i need to use nightly for iOS builds (to add the static library to a xcframework - https://github.com/rust-lang/rust/issues/79408 )
2021-06-28 14:30:37 lambda bwidawsk: if possible, produce the strings only at the top level, and use properly typed objects everywhere else
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2021-06-28 14:34:18 bwidawsk lambda: not sure I follow how to do it.. Here's a small example
2021-06-28 14:34:19 bwidawsk if let Some(matches) = matches.subcommand_matches("info") {
2021-06-28 14:34:21 bwidawsk let memdev = memdev!(matches.value_of("dev").unwrap());
2021-06-28 14:34:23 bwidawsk let cmds = memdev.get_commands()?;
2021-06-28 14:34:25 bwidawsk serialized = serde_json::to_string_pretty(&cmds).unwrap();
2021-06-28 14:34:27 bwidawsk }
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2021-06-28 14:35:45 bwidawsk I want either serde version, or the raw vec printed - and I have this pattern throughout the app
2021-06-28 14:35:55 bwidawsk so what would the advice here be?
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2021-06-28 14:41:00 georgemp bwidawsk: something on these lines might work - 1. define a trait MyPrinter with a `fn print(&cmd)`. 2. Define objects that implements the trait JsonPrinter: MyPrinter, RawVecPrinter: MyPrinter. 3. Store a dyn trait object at a place that is accesible to the call site at `serialized=`.
2021-06-28 14:41:24 georgemp 4. call that dyn trait object instead of directly calling serde_json
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2021-06-28 14:42:37 georgemp there may be better approaches to this :)
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2021-06-28 14:43:42 bwidawsk georgemp: thanks. I'll think about that. It would seem there should be a simpler way to do this
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2021-06-28 14:46:23 bwidawsk I guess at least if I use a function like GreenJello was saying, I can use a global there...
2021-06-28 14:46:52 ec Did insert on Option<T> used to take 2 arguments?
2021-06-28 14:47:00 georgemp is it possible for me to examine (easily) the spec for an existing target tuple? i'd like to make a custom .json, but, it would be easier if i could base it off an existing entry for the same architecture
2021-06-28 14:48:10 j`ey georgemp: --print-cfg
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2021-06-28 14:48:30 j`ey sorry, --print cfg
2021-06-28 14:49:27 georgemp j`ey: is that a cargo/rustc command?
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2021-06-28 14:51:51 georgemp `rustc --print cfg` shows me some values for my current arch (i think). I'd like to see the values for a diff arch (x86_64-apple-ios), so that i can create a new target.json (like here https://github.com/rust-lang/rust/issues/79408#issue-750675820)
2021-06-28 14:51:54 Alexendoo ec: what would the second arg be?
2021-06-28 14:53:05 ec Alexendoo: in the code I'm seeing, they're calling "error.insert(variant, |_| panic!("Only one #[error] variant can be declared."));"
2021-06-28 14:53:36 j`ey georgemp: so pass --target
2021-06-28 14:53:36 bertptrs ec: got a link to that code?
2021-06-28 14:54:10 j`ey georgemp: and it's actually --print target-spec-json
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2021-06-28 14:55:49 ec bertptrs: https://docs.rs/logos-derive/0.7.7/src/logos_derive/lib.rs.html#1-223
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2021-06-28 14:58:15 bertptrs ec: seems they include their own "OptionExt" trait that adds this two-argument variant
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2021-06-28 14:59:15 bertptrs also this version is kinda old
2021-06-28 14:59:24 bertptrs old enough to break docs.rs
2021-06-28 14:59:26 georgemp j`ey: thanks..examining the rustc options led me to that as well `rustc +nightly -Z unstable-options --print target-spec-json --target x86_64-apple-ios` :)
2021-06-28 15:00:32 ec bertptrs: The reason I'm asking is it fails to build on rust 1.53 but builds fine on 1.46, a far downstream dependency for a crate I'm using
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2021-06-28 15:01:22 j`ey ec: what error do you get?
2021-06-28 15:01:34 bertptrs that's because the regular insert method was added in 1.53 which means you now need a cast to avoid conflict
2021-06-28 15:01:40 j`ey ah
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2021-06-28 15:03:41 ec How do I visualize a dependency graph with cargo? I'll trying bumping the root and see if it pulls in a more recent version of logos-derive
2021-06-28 15:03:47 bertptrs cargo tree
2021-06-28 15:06:15 ec Cargo's amazing. Thanks for the help
2021-06-28 15:06:25 bertptrs happy to. Good luck!
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2021-06-28 16:26:36 i3d if I have let s1 = String::from("foo"); and then let s2 = s1; the ownership would be moved from s1 to s2 given the understanding that s2 now will own the same piece of memory of that string data, but if I print the pointer of s1 and s2, they aren't really having the same addresses, I suspect that whether I am actaully printing the address of the string data? Or is there a way to do that?
2021-06-28 16:27:03 j`ey i3d: try s2.as_ptr();
2021-06-28 16:27:21 i3d you mean print that value?
2021-06-28 16:27:23 j`ey yeah
2021-06-28 16:27:29 i3d ok, let me try it
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2021-06-28 16:30:25 i3d j`ey: awesome, thank you for the trick. so as_ptr is the way to print the pointer to the data. May I as what's the address I printed out with just &s1 or &s2?
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2021-06-28 16:31:32 j`ey i3d: that's the part of the String that is uh
2021-06-28 16:31:40 j`ey i3d: contains the pointer?
2021-06-28 16:32:07 i3d j`ey: sorry what? I didn't really follow
2021-06-28 16:32:07 j`ey String is struct String { chars: ptr } (not exactly, but close enough)
2021-06-28 16:32:15 i3d sure
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2021-06-28 16:32:20 j`ey so &s1 is the address of that struct, and as_ptr() is the chars ptr
2021-06-28 16:32:28 i3d ah ... got it
2021-06-28 16:32:45 i3d so what I printed is the addresses of the two different String structs
2021-06-28 16:33:02 j`ey yeah
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2021-06-28 17:07:48 davros i kind of want a 'const' on a field... i suppose you'd have to do that just making it priv and using an accessor
2021-06-28 17:08:37 davros kind of inverse of C++'s mutable workaround for consts... a const field that makes something immutable reached from &mut
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2021-06-28 17:10:24 davros originally what I had done is a pair of context variables (read, read/write) basically. in one system, these were a tuple (someone says yuk), in another, a pair of parameters. (doubles up the amount of vars in the scope). I'm trying this "stuff them all in one place" approach. Some parts of that are refs to immutable stuff (that works fine), but it would be clearer to indicate that those refs themselves should not change.
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2021-06-28 17:11:34 davros i suppose a newtype wrapping any system , mutable, could give mutable/immutable views over subsets as needed (i've gone and bundled up some refs)
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2021-06-28 17:33:29 Tv_ anyone have a brilliant idea how to get the moral equivalent of a build id for a *library* not just the main binary? use case: i have an internal protocol that is tightly controlled in production and thus doesn't need versioning, but in testing i sometimes accidentally run components with different source code edits against each other.
2021-06-28 17:33:57 Tv_ and git describe's --dirty isn't quite enough to prevent me from wasting time debugging in development
2021-06-28 17:34:39 Tv_ i used to hash the executable, but that fails when i want to use a small stub client to poke things manually
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2021-06-28 17:43:01 Tv_ hrmm let's see if build.rs setting an env var to random value works well enough
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2021-06-28 17:45:58 j`ey HashMap::new(), can it be const ever? Or is it not possible due to RandomState?
2021-06-28 17:46:58 Tv_ i'm not afraid of reaching for getrandom
2021-06-28 17:47:11 Tv_ what i am not 100% familiar with is exactly when build.rs runs etc
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2021-06-28 17:48:20 i3d after [&str].iter().filter(some_closure).collect() It appears that I no longer able to just .join(" ") the result anymore...
2021-06-28 17:48:42 j`ey i3d: whats the error?
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2021-06-28 17:49:02 i3d something like trait bound not satisfied
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2021-06-28 17:49:23 i3d <[&&str] as Join<_>>::Output = _
2021-06-28 17:49:27 j`ey try collect::<Vec<_>>()
2021-06-28 17:49:35 i3d try that too
2021-06-28 17:49:40 j`ey i3d: https://play.rust-lang.org/?version=stable&mode=debug&edition=2018
2021-06-28 17:49:52 Alexendoo with_hasher is const in hashbrown
2021-06-28 17:50:13 j`ey Alexendoo: interesting
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2021-06-28 17:52:01 i3d j`ey: ok on the playground
2021-06-28 17:52:26 i3d j`ey: https://play.rust-lang.org/?version=stable&mode=debug&edition=2018&gist=c56bf0084e5f764dd0682eff1eb8482a
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2021-06-28 17:53:34 j`ey ugh, that's kinda ugly actually
2021-06-28 17:53:40 Alexendoo I can't imagine new would ever be const though, it wouldn't be protected against hashdos if you had access to the binary
2021-06-28 17:53:40 j`ey https://play.rust-lang.org/?version=stable&mode=debug&edition=2018&gist=1b1501b2f867a4858ba9bdd33037dcaf
2021-06-28 17:53:42 i3d with all that transformation the type has changed from [&str] to Vec<&&str> though. looks like the filter call added another & ther
2021-06-28 17:54:07 j`ey i3d: it's not the filter
2021-06-28 17:54:21 j`ey i3d: iter() on that array is iterating over &&str
2021-06-28 17:54:22 i3d j`ey: hm... another map.
2021-06-28 17:54:31 i3d j`ey: just to remove the &
2021-06-28 17:54:34 j`ey i3d: yeah
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2021-06-28 17:55:20 i3d oh I see... so iter on & of &str...
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2021-06-28 17:55:51 j`ey i3d: https://play.rust-lang.org/?version=stable&mode=debug&edition=2018&gist=b8c342d93340730ea15ca3ffee02697e
2021-06-28 17:56:11 i3d wish the compiler would be smart to say ok it's a ref already, just use it...
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2021-06-28 18:11:23 kupi is there a prettier way to write this two liner? https://gist.github.com/theqp/7e89a6f0c6e7ab2ca06f3eeed607901e
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2021-06-28 18:15:30 GreenJello _ instead of _x
2021-06-28 18:16:53 kupi GreenJello: thanks, I wish the compiler suggested that
2021-06-28 18:17:10 tomboy64 ugh
2021-06-28 18:17:41 tomboy64 i just noticed LinkedList::remove() is marked as experimental/nightly-only
2021-06-28 18:18:01 GreenJello _bytes would also be a good name. The compiler doesn't know that _x carries no meaning
2021-06-28 18:18:42 tomboy64 i need to maintain a priority queue and remove random elements efficiently while preserving the original order, while new elements only get appended to the end
2021-06-28 18:18:56 tomboy64 suggestions how to achieve that?
2021-06-28 18:19:15 tomboy64 hmmm. maybe Vec<Option<_>>?
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2021-06-28 18:21:40 GreenJello yeah, I don't know of any ordered collections with efficient random access deletion, unless you leave holes which Vec<Option<T>> lets you do
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2021-06-28 18:26:10 kupi let x = ... means is that both the variable x is immutable and the value too?
2021-06-28 18:26:36 GreenJello it means you can't borrow 'x' mutably
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2021-06-28 18:27:00 GreenJello you could still move it into a variable/argument that has a `mut`
2021-06-28 18:27:29 GreenJello let mut y = x; y.takes_mut_ref()
2021-06-28 18:27:52 kupi but after that I can't use x because it is borrowed?
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2021-06-28 18:28:18 GreenJello because it's moved (assuming it doesn't impl Copy)
2021-06-28 18:29:46 kupi so the meaning of x cannot change in a scope unless I shadow it?
2021-06-28 18:30:01 GreenJello correct
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2021-06-28 18:36:57 normalperson THIS
2021-06-28 18:37:26 la_mettrie was?
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2021-06-28 18:48:20 tomboy64 meh
2021-06-28 18:48:28 tomboy64 unsatisfying state of affairs
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2021-06-28 18:56:38 habnabit_ kupi, do you not need to make it a move closure?
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2021-06-28 18:59:32 kupi habnabit_: why would I?
2021-06-28 18:59:53 kupi oh wait it is used in map
2021-06-28 19:00:12 kupi weirdly it compiles
2021-06-28 19:00:13 habnabit_ kupi, yeah, in the map, you seem to be trying to move the String to return a String
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2021-06-28 19:00:33 habnabit_ i wonder why that's legal to omit the move
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2021-06-28 19:01:58 habnabit_ huh, yeah https://play.rust-lang.org/?version=stable&mode=debug&edition=2018&gist=c5ab31ec33c95dc686cd8b15eb37a378
2021-06-28 19:02:29 kupi habnabit_: i think i got it
2021-06-28 19:02:38 kupi the function which receives map implements FnOnce
2021-06-28 19:02:47 kupi which means the function will only be called once
2021-06-28 19:03:05 kupi *which map receives
2021-06-28 19:03:07 SpaceManiac you don't need `move` if the compiler can tell from how you use the variable
2021-06-28 19:03:09 habnabit_ hm. so a FnOnce closure can omit move?
2021-06-28 19:03:12 habnabit_ SpaceManiac, ah
2021-06-28 19:03:24 SpaceManiac it's not tied directly to Fn/FnMut/FnOnce
2021-06-28 19:03:39 habnabit_ i thought it was required if you wante to move into a closure
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2021-06-28 19:04:18 kupi > FnOnce is implemented automatically by closures that might consume captured variables, as well as all types that implement [FnMut], e.g., (safe) function pointers (since FnOnce is a supertrait of [FnMut]).
2021-06-28 19:04:57 SpaceManiac it's common that FnOnce coincides with a closure where the compiler knows to move without the `move` keyword
2021-06-28 19:05:52 SpaceManiac but it's based on the content of the closure, not what `map` accepts
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2021-06-28 19:16:49 gggp what is interior mutability
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2021-06-28 22:15:56 Gaelan Anyone know if there are equivalents to std::io::{Write, Read} that have an associated error type instead of hard-coding io::Error?
2021-06-28 22:19:43 cehteh note that you can pass custom/generic errors with io::Error
2021-06-28 22:20:03 danieldg Gaelan: someone has likely written one, but I don't know of it
2021-06-28 22:20:42 Gaelan cehteh: right, I know that, and maybe it's the best solution; but mashing things into an Any when I could type it better makes me sad
2021-06-28 22:20:43 danieldg it's not a hard trait to write, but also not very widely useful
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2021-06-28 22:21:09 danieldg you usually want a higher-level interface than bytes if you have custom errors anyway
2021-06-28 22:21:37 cehteh Gaelan: i meant io::ErrorKind::Other
2021-06-28 22:22:23 Arnavion Perhaps they meant Box<dyn std::error::Error> instead of Any. It's not strongly-typed either way
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2021-06-28 22:24:25 Gaelan Arnavion: yeah, my bad
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2021-06-28 22:25:51 Gaelan in any case, I'll just write one myself; would just have used an existing standard one if it existed
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2021-06-28 23:29:24 discipulus rk4: which book did you mention a few days ago?
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2021-06-29 00:22:02 ssbr pin-project is fundamentally unsound, I think -- if you used pin-project and a competitor crate that did the same thing, but declared a field pinned in one and not the other, you'd be able to violate the pin guarantee. Does pin-project do anything special to prevent this?
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2021-06-29 00:23:40 danieldg doesn't it impl Drop for you?
2021-06-29 00:23:43 ssbr Maybe it' something silly, like "syntactically, you can't really do #[pin_project] #[recursively_pinned] struct Foo {uh_oh: T }"
2021-06-29 00:23:52 danieldg two impls of Drop would error out
2021-06-29 00:24:31 ssbr danieldg: mmmm, that's a good point. And any trait which *didn't* implement drop for you would be unsafe already, because then it lets users define drop (and thus be able to access fields without the pin)
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2021-06-29 00:24:55 ssbr so any conflicting trait would be unsafe by design already, even without this issue
2021-06-29 00:25:10 ssbr (which sort of resolves this: if you write dangerous traits, you get dangerous results!)
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2021-06-29 00:26:39 ssbr thanks!
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2021-06-29 01:11:50 oaken-source my cross-compiled rustc segfaults when trying to compile a native compiler. any tips?
2021-06-29 01:11:54 oaken-source rustc exited with signal: 11
2021-06-29 01:11:55 oaken-source error: could not compile `compiler_builtins`
2021-06-29 01:12:36 oaken-source I haven't yet figured out what's special about compiler_builtins that makes it crash there
2021-06-29 01:12:53 oaken-source and it's difficult to isolate that step of the build process
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2021-06-29 01:33:08 oaken-source maybe I should rebuild llvm
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2021-06-29 04:54:17 nox pin-project is not fundamentally unsound
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2021-06-29 05:08:26 tomboy64 i've been trying to find out whether a comparison &somval == &someotherval is always implicitly converted to *(&someval) == *(&someotherval)? or is there a caveat that it might actually check if those references are pointing to "the same thing"?
2021-06-29 05:08:47 tomboy64 i tried to google it but my google-fu is insufficient it seems :(
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2021-06-29 05:16:06 tomboy64 never mind. just found ptr::eq().
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2021-06-29 05:54:17 discipulus &someval == &someotherval evaluates to <&T as PartialEq>::eq(&&someval, &&someotherval).
2021-06-29 05:54:46 discipulus What does <&T as PartialEq>::eq(&&someval, &&someotherval) do?
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2021-06-29 05:58:03 bertptrs Itself. &T implements PartialEq<&T> by deferring to the implementation for T
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2021-06-29 06:05:55 discipulus yeah, I see its doing PartialEq::eq(*self, *other) https://doc.rust-lang.org/nightly/src/core/cmp.rs.html#1385-1397
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2021-06-29 06:08:48 discipulus "Reference equality by address, instead of comparing the values pointed to, is accomplished via implicit reference-pointer coercion and raw pointer equality via ptr::eq, while PartialEq compares values." https://doc.rust-lang.org/stable/std/primitive.reference.html
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2021-06-29 06:09:06 discipulus so to compare addresses use ptr::eq()
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2021-06-29 06:44:26 nox Also don't compare trait object pointers naively
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2021-06-29 06:45:11 nox cause their vtable pointer may be different depending on how the build was done
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2021-06-29 06:52:10 discipulus nox: what happens/how does it work?
2021-06-29 06:53:42 bertptrs The example is given in the docs of ptr::eq
2021-06-29 06:57:06 ac5tin if i want to simultaneously run a few async functions, should i use futures::try_join! or futures::join_all
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2021-06-29 06:58:13 discipulus bertptrs: the example doesn't mention vtables or how the build changes things
2021-06-29 06:58:49 Geekingfrog ac5tin, They have different semantics. try_join! expects tasks to return a Result, and will cancel all other tasks as soon as one returns an error. join_all will return a vec of whatever your tasks returns.
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2021-06-29 06:59:26 ac5tin i have a list of tasks that returns Result, and i want all of them to continue running even if one of them fails
2021-06-29 06:59:50 rk4 discipulus: i do not recall, but odds are it was
2021-06-29 07:00:02 Geekingfrog ac5tin, I would go with join_all in this case
2021-06-29 07:00:10 rk4 discipulus: 'Programming Rust, 2nd Edition'
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2021-06-29 07:00:45 Geekingfrog ac5tin, you get a Vec<Result<??>> when the last task complete, and you can decide how to handle that.
2021-06-29 07:01:02 discipulus rk4: yes, I think that's it. I remember you mentioning 2nd edition.
2021-06-29 07:01:06 ac5tin can i get an array with fixed size instead of vector
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2021-06-29 07:01:50 ac5tin vector works too, just curious if i can define the size
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2021-06-29 07:02:19 Geekingfrog ac5tin, uhm, I think the macro try_join! returns a tuple actually
2021-06-29 07:02:20 nox discipulus: Depending on whether there are multiple code hen units etc, the vtable can be duplicated inside the final binary
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2021-06-29 07:03:18 ac5tin the biggest difference between try_join! and join_all is that join_all will always finish all tasks while try_join! terminates on the first error, is that right?
2021-06-29 07:03:38 Geekingfrog Yes, that's my understanding.
2021-06-29 07:03:43 ac5tin thx
2021-06-29 07:03:48 nox discipulus: https://github.com/rust-lang/rust/issues/46139
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2021-06-29 07:06:54 lalbornoz YOUR CHATS MAKE ME SO MAD I PUNCH HOLES IN MY WALL! THATS WHY I ONLY HANG OUT AT IRC.LIBERA.CHAT #MIDIPIX
2021-06-29 07:06:56 lalbornoz_ YOUR CHATS MAKE ME SO MAD I PUNCH HOLES IN MY WALL! THATS WHY I ONLY HANG OUT AT IRC.LIBERA.CHAT #MIDIPIX
2021-06-29 07:07:02 j`ey mrmonday:
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2021-06-29 07:07:49 -- Mode ##rust [+o jbg] by ChanServ
2021-06-29 07:07:50 la_mettrie with rust you could code more effective spam-bots
2021-06-29 07:08:32 -- Mode ##rust [-o jbg] by ChanServ
2021-06-29 07:09:11 discipulus nox: thank you
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2021-06-29 07:18:43 Geekingfrog oh btw ac5tin there is also futures::join! which is the same as join_all, but returns a tuple and not a vec. If you know at compile time all the tasks, and want to avoid the vec, it's probably a good match
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2021-06-29 07:19:41 mrmonday sorry, little too late
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2021-06-29 07:38:16 bertptrs mrmonday: it seems you got your coverage :P
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2021-06-29 07:56:14 mrmonday heh, guess so :)
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2021-06-29 08:19:00 * rk4 ponders rocksdb vs sled
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2021-06-29 08:27:05 bonhoeffer just learning rust -- I'm writing a script to pull stuff out of a text file so I have to make lots of modifications. compiling each time is a bit cumbersome. is there a way to speed that up other than rustc myscript && ./myscript
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2021-06-29 08:31:24 j`ey bonhoeffer: not really
2021-06-29 08:31:47 bonhoeffer ok
2021-06-29 08:32:00 j`ey cargo does incremental compilation, but you still have to compile/link
2021-06-29 08:32:08 bonhoeffer it's not hard -- and so much cleaner than python
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2021-06-29 08:34:07 gggpkm j`ey, what is interior mutability
2021-06-29 08:34:24 gggpkm refcell
2021-06-29 08:34:38 j`ey gggpkm: it's mutability behind a non-mutable &reference
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2021-06-29 08:35:14 gggpkm what is the scenario to use it
2021-06-29 08:35:41 gggpkm this is trying to cheat the compiler
2021-06-29 08:35:57 j`ey yes kinda
2021-06-29 08:36:11 gggpkm what is the scenario to use it
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2021-06-29 08:37:38 j`ey maybe https://doc.rust-lang.org/std/cell/index.html#when-to-choose-interior-mutability helps
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2021-06-29 08:41:57 gggpkm j`ey, what is the diff between move and rc
2021-06-29 08:43:00 j`ey well if you move something, you change owners, Rc allows multiple onwers
2021-06-29 08:46:41 mike-burns Good interview questions.
2021-06-29 08:47:32 gggpkm j`ey, oops ,my question is borrow ,not move
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2021-06-29 08:48:22 j`ey Rc is runtime borrowing
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2021-06-29 08:49:10 gggpkm what is advantage
2021-06-29 08:49:50 j`ey sometimes its just not a static thing the comiler can prove
2021-06-29 08:50:14 rk4 mike-burns: tell us about a time that rustc gave you feedback, and how you responded to that
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2021-06-29 08:55:03 zipper Hello all, I have an interesting problem. I need to mutably borrow two different fields in a struct but the borrow checker feel that I am mutably borrowing the struct itself.
2021-06-29 08:55:08 zipper How do I get around this?
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2021-06-29 08:55:37 jbg pastebin/playground the code
2021-06-29 08:56:06 zipper it's a ton but okay
2021-06-29 08:56:15 jbg preferably just the relevant part
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2021-06-29 08:56:55 gggpkm move is rarely use ,right?
2021-06-29 08:57:15 gggpkm reference is prefer
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2021-06-29 08:57:44 j`ey gggpkm: it depends
2021-06-29 08:57:57 jbg gggpkm: you move when you want to move, and reference when you want to reference. it doesn't make sense to arbitrarily prefer one or the other
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2021-06-29 08:58:22 gggpkm but reference is mostly used indeed
2021-06-29 08:58:34 jbg is it?
2021-06-29 08:59:39 zipper https://play.rust-lang.org/?version=stable&mode=debug&edition=2018&gist=5fbc269c421a480898a794cf2b21c2a1
2021-06-29 08:59:46 zipper On line 364 and 365
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2021-06-29 09:03:45 kupi hi, the point of heap is to find values based on a reference?
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2021-06-29 09:07:05 rk4 that's a curious phrasing, also the stack has limitations [size, and lifetime of the contents of your stackframe] that makes the heap a better place for some values
2021-06-29 09:07:15 jbg zipper: yeah so get_wavefront_mut takes &mut self and returns 'something borrowed from self', so self remains mutably borrowed as long as that returned reference is alive
2021-06-29 09:08:34 jbg since you're passing score to wf_extend anyway, could you not just pass &mut wavefronts to wf_extend and move the get_wavefront_mut call into wf_extend?
2021-06-29 09:09:37 j`ey rk4: there's a data structure called a 'heap'
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2021-06-29 09:09:57 j`ey rk4: https://doc.rust-lang.org/std/collections/struct.BinaryHeap.html
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2021-06-29 09:10:49 zipper that had caused me issues inside wf_extend but directly borrowing (instead of my get_Wavefront_mut) seems to be working
2021-06-29 09:10:54 zipper `let mwavefront = &mut wavefronts.wavefronts.get_mut(score).unwrap().mwavefront;`
2021-06-29 09:11:12 zipper There's no way to get that function not to take &mut self, right?
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2021-06-29 09:12:07 gggpkm let ptr = Box::new(5); does ptr equal to the memory address whose value is 5
2021-06-29 09:12:12 rk4 j`ey: indeed! fair point it could be that heap, though the question is a little weird in that context too
2021-06-29 09:12:27 j`ey gggpkm: no, ptr is a value on the stack, that contains a pointer to the address
2021-06-29 09:13:07 gggpkm j`ey, is its pointer equal to the memory address whose value is 5
2021-06-29 09:13:25 j`ey gggpkm: the pointer is some memory address, at that memory address is 5
2021-06-29 09:14:19 gggpkm j`ey, how to get the pointer's value
2021-06-29 09:14:27 j`ey ptr.as_ptr()
2021-06-29 09:14:42 j`ey evalr2: let p = Box::new(5); p.as_ptr()
2021-06-29 09:14:43 jbg zipper: you need to take &mut self if you are mutating self / getting a mutable reference to a field inside self, but you could do an interior mutation pattern if you wanted
2021-06-29 09:14:44 -- Notice(evalr2): j`ey: error[E0599]: no method named `as_ptr` found for struct `Box<{in ...
2021-06-29 09:14:45 -- Notice(evalr2): j`ey: https://play.rust-lang.org/?version=stable&mode=debug&edition=2018&gist=ac2e2edbc3ef2ef6a4abe8990819293e
2021-06-29 09:15:12 j`ey oh derp
2021-06-29 09:15:14 jbg if the field inside is a cell or behind a lock then you could access it via a &self
2021-06-29 09:15:31 j`ey evalr2: let p = Box::new(5); Box::into_raw(p)
2021-06-29 09:15:34 -- Notice(evalr2): j`ey: 0x55aa527479d0
2021-06-29 09:15:48 j`ey how dyo you get the address without consuming?
2021-06-29 09:16:17 gggpkm j`ey, as_ptr() ?
2021-06-29 09:16:28 gggpkm underscore ?
2021-06-29 09:16:49 j`ey gggpkm: no it's Box::into_raw(ptr)
2021-06-29 09:16:52 j`ey I got it wrong
2021-06-29 09:17:30 gggpkm how about as_mut_ptr
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2021-06-29 09:17:36 gggpkm what is the diff
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2021-06-29 09:18:50 j`ey gggpkm: well Box doesnt have those methods
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2021-06-29 10:08:08 osa1 if I do `#[x] #[y] <item>` will `x` be attached to `y`, or `item`, or `#[y] <item>`?
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2021-06-29 10:12:02 danieldg osa1: pretty sure it attaches both to item
2021-06-29 10:12:20 danieldg else derive+repr wouldn't work
2021-06-29 10:19:27 osa1 danieldg: good point, thanks
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2021-06-29 10:39:18 jbg j`ey: to get the ptr without consuming wouldn't it just be &*the_box as *const T
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2021-06-29 10:40:11 j`ey ah yeah
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2021-06-29 10:40:52 j`ey evalr2: let b = Box::new(5u64); let x = &*b as *const _; (Box::into_raw(b), x)
2021-06-29 10:40:55 -- Notice(evalr2): j`ey: (0x55d6d6a4d9d0, 0x55d6d6a4d9d0)
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2021-06-29 10:55:09 cehteh success!
2021-06-29 10:55:09 cehteh error: internal compiler error: unexpected panic
2021-06-29 10:55:12 cehteh :D
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2021-06-29 11:04:01 trev what's the proper way to run and join an async fn from within a non-async fn? i am using tokio::runtime::Handle::current() to get the runtime
2021-06-29 11:05:30 osa1 trev: you'll have to create an executor, spawn the tasks. the library you use probably also provides a macro for joining. are you using tokio?
2021-06-29 11:05:49 -- tims1 is now known as tims
2021-06-29 11:06:02 osa1 or if you already have an executor running, you could pass a handle to it to your non-async function and spawn via that
2021-06-29 11:09:21 trev osa1 yes, tokio, already running in an executor, but no way to pass anything to this function since it's from a trait where i need to use some async code
2021-06-29 11:10:13 danieldg trev: call the async fn, it returns a future. Then spawn that future.
2021-06-29 11:10:37 trev i guess i'
2021-06-29 11:10:42 danieldg trev: if you need to wait for the result, you need to set up a channel that the future sends on (oneshot channels are good for this)
2021-06-29 11:11:02 trev ah...the channel is what i was missing thanks danieldg
2021-06-29 11:11:07 trev totally forgot about that
2021-06-29 11:11:34 danieldg make sure you are using a multi-threaded executor, because waiting on the channel will block your thread
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2021-06-29 11:12:29 trev ok that's not enabled...:D
2021-06-29 11:13:02 danieldg to be nice, you should also make sure the parent tells tokio it will be blocking
2021-06-29 11:13:41 danieldg tokio also lets you do things like block_on if you have a Runtime object sitting around
2021-06-29 11:14:22 danieldg (that is, if you're not already in a tokio context)
2021-06-29 11:14:37 trev block_on did not work for me since i'm in a context already. i'm just trying to initialize a struct which happens to be async in the external crate for some reason :\
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2021-06-29 11:17:49 kupi is there anything an experienced rustecian would have done differently here? https://gist.github.com/theqp/851e1d49086ff8ad6617d91ff929027b
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2021-06-29 11:21:54 danieldg kupi: Only minor things like error handling instead of unwrap
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2021-06-29 11:22:33 kupi danieldg: by that you mean .expect(str)?
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2021-06-29 11:23:01 bertptrs no, actually handling the error
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2021-06-29 11:23:32 danieldg in this case you can't do much more than that to handle the error, but the default expect/unwrap error messages are not the best
2021-06-29 11:23:47 bertptrs you could slightly simplify your readline() by using the try operator
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2021-06-29 11:24:03 bertptrs io::stdin().read_line(&mut ret)?; ret
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2021-06-29 11:29:38 kupi bertptrs: don't you mean this? io::stdin().read_line(&mut ret)?; Ok(ret)
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2021-06-29 11:29:47 bertptrs Oh yeah, correct
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2021-06-29 11:34:54 trev danieldg a tokio oneshot will require await to receieve a value still right? so i can't use that unless i do try_recv()
2021-06-29 11:35:41 danieldg use a std::sync::oneshot
2021-06-29 11:36:37 trev it doesn't exist. i can just use a regular channel i guess
2021-06-29 11:37:26 trev sync_channel(1) i mean
2021-06-29 11:37:42 jbg condvar?
2021-06-29 11:37:57 danieldg eh, I guess sync-channel-1 is it
2021-06-29 11:38:15 trev or is it sync_channel(0)....
2021-06-29 11:38:33 danieldg either would work
2021-06-29 11:38:52 danieldg depends on if you want the task to complete without waiting on your recv
2021-06-29 11:39:18 danieldg sync_channel(1) is nicer because the task won't hang around for no good reason
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2021-06-29 11:40:27 trev yeah that seems better
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2021-06-29 11:46:11 kupi bertptrs: what do you think of this? :P https://gist.github.com/theqp/a29f1ff3115fadfadf1a39ffa93e07c7
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2021-06-29 11:48:18 danieldg note recv_timeout has issues, avoid it
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2021-06-29 14:41:56 bwidawsk is there an idiomatic way to use '?' in a for_each closure?
2021-06-29 14:42:43 j`ey bwidawsk: no
2021-06-29 14:43:04 bwidawsk j`ey: :/
2021-06-29 14:43:04 j`ey you cant use ? in a closure and have it return from the outer function
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2021-06-29 14:43:36 bwidawsk it makes sense... I just figured there would be some pattern since it must be a common thing
2021-06-29 14:43:52 j`ey bwidawsk: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.try_for_each
2021-06-29 14:43:55 Arnavion If this is Iterator, it has try_for_each
2021-06-29 14:44:19 Alexendoo Or often for in is nicer
2021-06-29 14:44:56 bwidawsk ah, I missed that... thanks
2021-06-29 14:46:35 ashafq Is there a way I can add post-build steps in build.rs?
2021-06-29 14:46:41 bwidawsk Alexendoo: what's 'for in' ?
2021-06-29 14:46:46 j`ey ashafq: no
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2021-06-29 14:47:28 ashafq j`ey: How about copying generated file into a specific directory?
2021-06-29 14:47:56 j`ey ashafq: you can do that in a build.rs yes
2021-06-29 14:48:05 Alexendoo bwidawsk: for x in y { ... }
2021-06-29 14:48:20 ashafq j`ey: How? Where is this documented?
2021-06-29 14:49:01 j`ey ashafq: oh, you mean after the build? no
2021-06-29 14:49:03 bwidawsk Alexendoo: ha... why didn't I think of rewriting it that way :D
2021-06-29 14:50:27 ashafq j`ey, :( that's not fun.
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2021-06-29 14:53:10 cehteh ashafq: https://crates.io/crates/bintest .. but thats made for testing, does a build for testing and you can do things post build there, as long you did a cargo build
2021-06-29 14:53:15 cehteh err cargo test
2021-06-29 14:54:03 cehteh otherwise makefile .. i am trying hard to avoid it yet but eventually i think i add makefiles calling cargo to my project
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2021-06-29 14:55:20 j`ey that's what I've done
2021-06-29 14:55:28 ashafq cehteh, Thanks
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2021-06-29 14:59:34 cehteh ashafq: for what do you need that? planning to setup tests? install the program? put some resources in place?
2021-06-29 14:59:36 Hans-Martin hiya folks, anybody knowledgeable with libp2p? I got a comprehension problem with type propagation from NetworkBehaviour::OutEvent to swarm.poll_next_unpin() :-(
2021-06-29 15:00:52 ashafq cehteh, Building an audio plugin which needs to have some additional manifest files along with a .so file.
2021-06-29 15:01:23 cehteh isnt that part of some install process that isnt covered by cargo at all? -> Makefile
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2021-06-29 15:02:51 ashafq cehteh, Yes, I guess Makefile is the only option
2021-06-29 15:02:53 cehteh (or reading what cargo install can do .. but thats more dev environment things i think)
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2021-06-29 15:38:02 pounce does `std::fs::symlink_metadata(path)` returning `Ok(_)` roughly correspond to `faccessat(0, path, F_OK, AT_SYMLINK_NOFOLLOW)` returning 0? i.e. that a file exists without following symlinks
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2021-06-29 15:40:24 danieldg pounce: it's lstat, so it will follow directory symlinks
2021-06-29 15:41:00 pounce I see.... Is there any way to replicate the latter call? I haven't really seen any bindings to faccessat or access2 except in `libc` itself
2021-06-29 15:41:02 danieldg ah, and so does faccessat, so never mind
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2021-06-29 15:41:24 danieldg if you want faccessat you need to call faccessat
2021-06-29 15:41:37 pounce I thought the difference between `symlink_metadata` and `metadata` was that the former showed symlink info
2021-06-29 15:41:45 danieldg it does
2021-06-29 15:42:01 danieldg why do you want faccessat?
2021-06-29 15:42:04 pounce so if i have either a normal file or a symlink at `path` would it return `Ok(_)` if it exists?
2021-06-29 15:42:15 pounce danieldg `path.exists()` returns false for a symlink
2021-06-29 15:42:41 danieldg symlink_metadata will return ok for a symlink, yes
2021-06-29 15:42:45 pounce so im looking at alternatives
2021-06-29 15:42:48 pounce but not an ordinary file?
2021-06-29 15:42:58 danieldg symlink_metadata will return ok for a normal file too
2021-06-29 15:43:05 danieldg just try it :p
2021-06-29 15:43:10 pounce ok x_x
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2021-06-29 15:43:20 j`ey evalr2: "you can try it here"
2021-06-29 15:43:23 -- Notice(evalr2): j`ey: "you can try it here"
2021-06-29 15:43:31 pounce I think it'd work better than `path.exists()` for my case
2021-06-29 15:43:32 danieldg pounce: look at the type in the metadata
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2021-06-29 15:50:26 cehteh the *at API (openat, faccessat) is generally superior to the old legacy stuff, less race conditions, better performance in some cases
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2021-06-29 15:52:16 danieldg cehteh: true, but only if you use the dirfd argument or flags properly
2021-06-29 15:53:22 danieldg the rust std lib uses fstatx for direntry.metadata actually
2021-06-29 15:53:45 cehteh yes
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2021-06-29 15:55:08 cehteh i am planning to add statx to the openat crate .. unfortunally its maintainer seems to be a bit busy, i send a lot PR's 2.5 months ago or so an no response since then, fixing most of the open issues :/
2021-06-29 15:55:52 cehteh wondering if i shall fork it or ask for co-maintainership in case he cant cope
2021-06-29 15:56:04 danieldg crates.io needs a better way to handle abandoned crates in general
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2021-06-29 15:58:48 cehteh yes
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2021-06-29 15:59:22 cehteh well its not totally abadoned, he responded once, at the beginning
2021-06-29 15:59:35 cehteh possibly the is just swamped with daywork
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2021-06-29 16:02:07 cehteh i think identifying crates not by name but by some cryptographic key would be a nice start, then one could make a WoT that maps names to these keys and thus to the actual code. rather than having names claimed and abadoned
2021-06-29 16:02:34 cehteh (but implementing such a system would be a major effort)
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2021-06-29 16:03:29 danieldg well, Cargo.lock already does some of that for specific releases
2021-06-29 16:03:58 Alexendoo I believe there's some ongoing effort to add namespaces
2021-06-29 16:04:05 danieldg not sure why a WoT would be a helpful addition
2021-06-29 16:04:35 Hans-Martin Asking again for libp2p knowledgeable folks as my question is scrolling off :-)
2021-06-29 16:04:50 cehteh because you can add private/per-organization registries
2021-06-29 16:05:04 cehteh Hans-Martin: sorry no
2021-06-29 16:05:12 Hans-Martin :-(
2021-06-29 16:05:16 danieldg cehteh: you can already do that
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2021-06-29 16:05:38 cehteh danieldg: yeah but WoT could give some nice security layer
2021-06-29 16:06:15 Alexendoo It only adds security if you can do a better job of solving key sharing than some https url
2021-06-29 16:07:03 cehteh in my lib i can sign that it shall import library $cryptographic_key as foo
2021-06-29 16:07:04 danieldg or a better way to solve trust; WoT is hard enough just verifying identity
2021-06-29 16:07:20 cehteh Alexendoo: yes of course, i saied major effort
2021-06-29 16:07:43 danieldg Cargo.lock's hashing of the code is probably better there - you trust the code, not the key
2021-06-29 16:08:08 danieldg else you get the chrome web store issue of people selling their private keys
2021-06-29 16:08:18 cehteh lol
2021-06-29 16:08:56 cehteh remmeber the times when http://ssh-keygen.com was a thing?
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2021-06-29 16:09:07 danieldg never heard of it
2021-06-29 16:09:34 danieldg sounds like a great way to build yourself a botnet, though
2021-06-29 16:10:00 cehteh that was hilarious, some webservice which gave users a nice frontend to generate ssh keys :) ... for the commandlineophobes
2021-06-29 16:10:23 cehteh maybe 10/15 years ago
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2021-06-29 16:13:32 Hans-Martin yeah I would totally trust a keypair generated on some website...
2021-06-29 16:15:07 danieldg funny thing is, if you were running debian, it might have been more secure than generating locally
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2021-06-29 16:15:14 cehteh haha
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2021-06-29 16:16:57 cehteh actually i noticed many years after the debian debacle that i had one of these broken keys in use .. luckily only in the local net and not 'really' in use, was my wifes ssh key, but she really used it
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2021-06-29 16:17:46 danieldg yeah, I generated a secondary key during that period... never got around to rotating it in, luckily
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2021-06-29 16:20:09 cehteh btw in my pre-commit hook i got compile time from 1:20m to <30 sec and now ~4sec ... \o/ ... thats pretty good optimization result
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2021-06-29 16:26:02 Hans-Martin argh I think I found the cause of my problem. libp2p crate is at version 0.38, and the github project is at 0.39. Handling of swarm events has changed. Totally not mentioned in CHANGELOG :-(
2021-06-29 16:27:22 Hans-Martin so either pull the crate from github or work without the nice features...
2021-06-29 16:27:51 j`ey the 0.39 probably is unreleased?
2021-06-29 16:28:01 cehteh as long you are in development you can just pull from github and hope they make a release before you want to do so
2021-06-29 16:28:38 cehteh i am currently using nightly as well on my main project because it will takev loooong time before its releaseable
2021-06-29 16:28:56 cehteh (something p2p too :D but wont use libp2p)
2021-06-29 16:28:59 Hans-Martin yeah, I'm just playing around, no release plans yet, so I don't mind if using unrelease libs
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2021-06-29 16:29:43 Hans-Martin I actually have too little experience with p2p to write the complete stack from scratch, was hoping to get a headstart by using a comprehensive lib
2021-06-29 16:30:10 cehteh i may look at it again, but i tihnk its not needed for me
2021-06-29 16:30:35 cehteh and i want noise protocol between the peers
2021-06-29 16:30:54 Hans-Martin they do noise (among lots of other stuff)
2021-06-29 16:31:03 cehteh but still working on other things not a bit of networking yet
2021-06-29 16:31:16 cehteh well i may look at it when its time
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2021-06-29 16:32:23 cehteh i am stuill on the rust learning stage and creating some tools/libs on the way
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2021-06-29 16:37:26 Hans-Martin I'm also still learning - coming from a pure object oriented background, Rust is pretty foreign. I had the choice of doing C or something else without GC for some private project, and memory and type safety as in Rust wins hands down.
2021-06-29 16:37:57 Hans-Martin Could have learned Go, but there's only so much time...
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2021-06-29 16:42:48 cehteh i looked at go but found it unfit for my purposes (and much less nice)
2021-06-29 16:43:04 cehteh done plenty of C and some lua
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2021-06-29 16:45:03 Hans-Martin For anything big I'll stay with Smalltalk-80, reliable and doesn't get in the way. Type systems can be helpful but making them happy costs a lot of time and nerves.
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2021-06-29 16:50:43 cehteh lol
2021-06-29 16:51:22 cehteh i liked the smalltalk idea but never got used to the syntax back then, meanwhile it not that bad but its a bit antique
2021-06-29 16:51:51 mike-burns There are nice modern Smalltalks, like Pharo.
2021-06-29 16:52:45 cehteh i could like logtalk since prolog was one of my first programming languages and i always keep an eye on it, just dont use it anymore for serious stuff
2021-06-29 16:53:04 la_mettrie cehteh: for which purpose you studied prolog?
2021-06-29 16:53:31 cehteh but currently we are over the oo hype. it will be back in a few years i bet
2021-06-29 16:53:45 cehteh la_mettrie: just private interest
2021-06-29 16:54:04 cehteh happend to be my 2nd language after basic in the late 80's
2021-06-29 16:54:11 la_mettrie what kind of programs you wrote with it?
2021-06-29 16:54:25 cehteh nothing much mostly fooling around
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2021-06-29 16:55:37 cehteh i still value it for its learning experience and way of thinking one gets taught
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2021-06-29 17:05:24 ashafq cehteh, I was able to hack up a build.rs file to copy some files in the src directory to the target directory
2021-06-29 17:06:37 cehteh yes thats pretty doable, as long you want to do that before building
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2021-06-29 17:09:33 ashafq I guess all I can do after that is do a 'install.sh' or something
2021-06-29 17:10:38 cehteh if its unix only
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2021-06-29 17:13:07 cehteh i'd prolly leave the 'installation' to some packager/distributor/maintainer ... maybe create a ./contrib or whatever is necessary to host tools for that
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2021-06-29 17:51:07 ollierees I asked this in the ##programming room, but does anyone have any good pointers in a rustacean way? I keep on getting borrowing erros when I compile, which I can fix, but I think I can avoid them more if I adjust my thinking, and I keep on being told to tack on lifetimes to members of structs that are of other struct types, i.e. a Node struct in a Graph struct.
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2021-06-29 17:53:45 cehteh depends on what you want to archive .. self referring things in rust are hard, lifetimes are kindof infectionous, once you introduce them you have to carry them all around (but may given the best performance) .. but lifetimes cant fix circular references
2021-06-29 17:53:57 cehteh sometimes you can use Rc or Arc
2021-06-29 17:54:06 cehteh or some other things
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2021-06-29 17:59:41 ollierees So what's the advantage over using C? I get the feeling I still have to worry about memory management, but it trades expressiveness for safety.
2021-06-29 18:00:32 cehteh when you use safe rust then your program, once it compiles cant segfault/show UB
2021-06-29 18:00:48 cehteh doesnt mean its bug free, but it wont crash
2021-06-29 18:01:10 cehteh considering that panics and asserts are safe aborts
2021-06-29 18:01:57 Gottox but even then, you need to be expressive about the locations where your program may panic.
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2021-06-29 18:02:40 cehteh memory management in rust is kindof 'augmented' you dont need to worry about it but you may need to specify the dataflow a bit more precise, which generally leads to better design and more robust programs as well
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2021-06-29 18:04:05 cehteh but in most cases its implicit, when there is a borrow error that usually say "you are doing something stupid" .. rarely its fooled and the thing could be legal, then there are things how you can direct to do compile correctly
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2021-06-29 18:05:08 cehteh many malpratice one done in C (and worked there just by chance) wont pass the rust compiler you have to rethink some things
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2021-06-29 18:46:16 ashafq Is there ldexp() in Rust?
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2021-06-29 19:20:58 Arnavion Not in libstd
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2021-06-29 22:02:57 gggpkm what is the use of lib.rs file under folder
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2021-06-29 22:10:32 cehteh module
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2021-06-29 22:23:38 Mutabah gggp: `src/lib.rs` is the root file of a library
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2021-06-29 23:02:40 willbush Is there some special component that has to be installed via rustup to get rust-gdbgui? I have rust-gdb, but not rust-gdbgui and I wanted to give it a try.
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2021-06-29 23:08:01 willbush Nevermind, think I found the issue. There's a hardcoded list of binaries to link for rustup in NixOS https://github.com/NixOS/nixpkgs/blob/0d8cbf704cace86734d93d2b49a821e05b1d8bde/pkgs/development/tools/rust/rustup/default.nix#L61
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2021-06-29 23:41:00 gggpkm_ what is #![allow(dead_code, unused_macros) in the first line of file
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2021-06-29 23:42:48 jbg it's a module-level attribute (https://doc.rust-lang.org/rust-by-example/attribute.html) saying that within that module, the compiler will allow (i.e. won't warn about) about dead code or unused macros
2021-06-29 23:43:35 jbg the built-in attributes are documented here: https://doc.rust-lang.org/reference/attributes.html#built-in-attributes-index
2021-06-29 23:46:00 gggpkm_ jbg, #![] is coding for attributes?
2021-06-29 23:47:34 jbg yup. #![] is a crate-level attribute, actually (I misspoke above). there is also #[] which applies to a specific module/item
2021-06-29 23:47:43 jbg the first link I gave you above covers it pretty well
2021-06-29 23:48:03 gggpkm_ nice
2021-06-29 23:48:10 jbg so #![allow(dead_code, unused_macros)] turns off the dead_code and unused_macros lints for the entire crate
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2021-06-29 23:49:38 gggpkm I am wondering if Vec::New return a reference
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2021-06-29 23:50:07 jbg you can stop wondering if you look at the docs, which clearly show that Vec::new doesn't return a reference
2021-06-29 23:50:17 gggpkm is that rational or good
2021-06-29 23:50:24 jbg you can also figure it out logically: if it returns a reference, what it refer to?
2021-06-29 23:50:28 jbg *what does
2021-06-29 23:50:32 gggpkm I mean "if"
2021-06-29 23:50:43 jbg how could it return a reference? where would the storage be?
2021-06-29 23:51:09 gggpkm allocating a block of memory ,then return reference to it
2021-06-29 23:51:43 jbg I mean, that is basically what it does (except it doesn't allocate anything until something is pushed), but the reference is contained within the Vec structure
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2021-06-29 23:52:35 jbg if it returned an actual reference type, who would own this "block of memory" you refer to?
2021-06-29 23:52:38 jbg and when would it be dropped?
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2021-06-29 23:53:13 gggpkm jbg, so for every block of memory ,it must have a owner ?
2021-06-29 23:53:25 jbg I think you might want to read the rust book
2021-06-29 23:53:36 jbg if you have a reference, it refers to something that is owned
2021-06-29 23:54:17 jbg but going back to your Vec question, you might also want to look at the definition of the Vec struct
2021-06-29 23:54:33 gggpkm the std lib should return the owner to programmer
2021-06-29 23:54:36 jbg because it's basically already what you imagine
2021-06-29 23:54:45 jbg Vec is a pointer, a capacity, and a length
2021-06-29 23:55:22 jbg in other words, when you call Vec::new(), it arranges some storage (it doesn't actually allocate until you push something) and returns an owned value that encapsulates a reference to that storage
2021-06-29 23:55:49 jbg it's important that the value is owned by you, since when you drop it the storage will be freed
2021-06-29 23:56:33 gggpkm jbg, can I manipulate on the vec pointer directly
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2021-06-29 23:56:42 jbg you probably shouldn't but you absolutely can if you want to
2021-06-29 23:56:59 jbg the Vec documentation even goes into detail about the internal structure of it, what is guaranteed, and what is not
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2021-06-30 00:01:04 rk4 i would suggest learning the basics of rust via the book instead of irc, since once you get beyond the book you'll have much harder questions that you'll need people to answer and if you've tired everyone out with a million questions beforehand that are well addressed in the free documentation the community already wrote, it won't be so great
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2021-06-30 01:15:48 ac5tin is there a difference between Vec.first() and Vec.get(0)
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2021-06-30 01:17:58 jbg can you spot the difference by looking at the docs? the signature of those methods tells you all you need to know
2021-06-30 01:18:42 jbg I should say "difference or lack thereof" ;)
2021-06-30 01:21:22 ac5tin seems the same
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2021-06-30 01:22:07 jbg yup. first() and get(0) behave the same. there is one very minor difference though: first() is a const fn, so you can use it some places you can't use get(0)
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2021-06-30 01:23:12 jbg maybe that's only in nightly though
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2021-06-30 01:25:25 jbg anyway yeah they're the same, and the signature is really enough to know that; they both return Option<&T>. if one of them didn't return an Option you'd know that it panics when out-of-bounds (or does something more exotic like returning Default::default(), but by convention in that case it would have a name making that very clear like first_or_default() and it could only be defined for T: Default)
2021-06-30 01:25:45 ac5tin jbg: i got an error about shared reference being moved
2021-06-30 01:25:49 ac5tin jbg: https://paste.rs/1Q9
2021-06-30 01:26:19 jbg your paste is not useful to me at all; it contains neither the error nor a hint as to where the error occurred
2021-06-30 01:26:37 ac5tin the error is on the line `let err = ...`
2021-06-30 01:26:41 jbg and what is the error?
2021-06-30 01:26:51 jbg when asking people to help you, it's best not to make them guess at what help you need
2021-06-30 01:26:53 ac5tin the error message is : cannot move out of `*sp_res` which is behind a shared refernce
2021-06-30 01:27:17 jbg yes
2021-06-30 01:27:18 ac5tin move occurs because `*sp_res` has type `Result<(),Box<dyn stdError + Sync + std::marker::Send>>`
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2021-06-30 01:27:25 jbg first() returns a reference to the first element in the vec
2021-06-30 01:27:28 ac5tin thats the whole error
2021-06-30 01:27:35 jbg but err() tries to move the error out of the result
2021-06-30 01:27:57 jbg again, the docs make that clear, just from the function signature: https://doc.rust-lang.org/std/result/enum.Result.html#method.err
2021-06-30 01:28:00 ac5tin so what im trying to do is check if the 1st element is_err(), if it is then i want to convert it into a string
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2021-06-30 01:28:24 jbg it returns Option<E>, i.e. it gives ownership of the error if there is one, but you can't give ownership, because you only have a reference to the first element in the vec, not ownership of it
2021-06-30 01:28:26 jbg you have a few options
2021-06-30 01:28:53 jbg you can either move the element out of the vec (vec.remove(0) -- but that panics if the vec is empty)
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2021-06-30 01:29:00 jbg or you can just take a reference to the error instead of trying to move it
2021-06-30 01:29:16 jbg .as_ref().err()
2021-06-30 01:29:39 jbg your code might be tidier written as a match
2021-06-30 01:29:53 ac5tin i think .as_ref().err().unwrap() works
2021-06-30 01:30:03 ac5tin my editor isnt complaining anymore
2021-06-30 01:30:13 jbg finalresult.abc = match sp_res.as_ref() { Ok(_) => "Ok".to_owned(), Err(e) => e.to_string() };
2021-06-30 01:30:29 ac5tin oh yaa, forgot about match
2021-06-30 01:30:40 ac5tin match is actually very useful
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2021-06-30 01:32:50 ac5tin btw, is "".to_owned() same as "".to_string()
2021-06-30 01:33:07 jbg yeah
2021-06-30 01:33:09 Mutabah Subtle difference
2021-06-30 01:33:17 Mutabah but same effect
2021-06-30 01:33:28 jbg the standard library specialises to_string() on str
2021-06-30 01:33:32 jbg iirc?
2021-06-30 01:33:38 Mutabah yeah, it does
2021-06-30 01:33:53 Mutabah (I kinda missed the `""` part and looked up to the above `match`)
2021-06-30 01:34:05 jbg I vaguely remember some time in the past when it didn't and "".to_string() was inefficient because it used the formatting machinery?
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2021-06-30 01:35:02 ac5tin i used to do "".to_string() but recently switched to to_owned()
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2021-06-30 01:35:27 Mutabah Yep, before specialization that was the case
2021-06-30 01:35:49 Mutabah I also prefer to_owned, because it avoids any accidental "conversion"
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2021-06-30 02:48:24 kai hi folks
2021-06-30 02:49:17 kai I'm currently trying to update my rust install, and "rustup update" is failing, as is the install via curl from the website if I try to do a new install
2021-06-30 02:49:31 kai the error message I'm getting is "CloseHandle' panicked at 'called `Result::unwrap()` on an `Err` value: RecvError', src/diskio/mod.rs:421:40"
2021-06-30 02:50:32 kai I didn't see anything for this on google, so I'm a bit confused about what's going on
2021-06-30 02:54:12 ssbr and that's why every unwrap should really be an expect
2021-06-30 02:55:19 ssbr kai: what if you pass -v to get verbose output? It sounds like something went wrong that might show up in logs if you do that.
2021-06-30 02:55:29 ssbr (I have to go to a meeting soon, will be back in thirty minutes though)
2021-06-30 02:55:59 kai so after 5 or 6 tries always falling over while downloading IO-ops, it now seems to have worked
2021-06-30 02:56:09 kai I guess some sort of transient network issue
2021-06-30 02:56:41 ssbr that works too 😎
2021-06-30 02:57:33 kai hm, or I have a hardware issue, I just had a build die with a segfault that wasn't there the last time
2021-06-30 02:57:39 kai sigh
2021-06-30 02:58:31 kai I've seen a lot of random segfaults recently, so maybe there's something to that. I guess time to talk to IT\
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2021-06-30 03:08:29 mdf what's the proper way to convert between arrayviews from ndarray to complex vectors in basic_dsp? the only way I've got it to work so far has been to first .collect() a new Vec from the arrayview and then convert that to a real time vec, and then that to a complex time vec
2021-06-30 03:08:45 mdf I think it's hugely inefficient with lots of unnecessary allocations
2021-06-30 03:09:45 -- aoei is now known as Rust
2021-06-30 03:13:49 substack whole point of ndarray libs is usually to prevent needing to do exactly that sort of thing
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2021-06-30 03:17:13 mdf yeah, it would be optimal if I could just find out how to make ndarray and basic_dsp interop nicely
2021-06-30 03:17:55 jbg I don't know much about these crates but when you say "convert that to a real time vec" and then "[convert] that to a complex time vec", are the actual Vec types changing or only the elements?
2021-06-30 03:18:04 jbg because if only the elements, why not do it in the iterator chain before .collect()
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2021-06-30 03:26:08 mdf jbg: basic_dsp has this to_real_time_vec() that works for stdlib Vecs and outputs a DspVec. the conversion to complex time vec happens by using a to_complex() method of that DspVec, and I guess that's not the heaviest lifting
2021-06-30 03:27:49 jbg the Vec -> DspVec conversion doesn't look expensive. it just moves the Vec into the DspVec, resizing it if needed: https://docs.rs/basic_dsp_vector/0.9.4/src/basic_dsp_vector/vector_types/to_from_vec_conversions.rs.html#201-220
2021-06-30 03:27:50 substack mdf: sounds like if that lib had a more abstract trait input type instead of a vec only you could supply different implementations of the required routines and save some marshalling
2021-06-30 03:28:13 jbg did you actually observe it being hugely inefficient with lots of unnecessary allocations?
2021-06-30 03:29:08 jbg similarly, the real <-> complex conversions look almost free
2021-06-30 03:30:32 mdf the ArrayView from ndarray provides a read-only view to the contents of that array, so if I do .into_iter().collect::Vec<f64>() on that, it won't compile since it's iterating on &f64 items. so the way I got it working was to call to_owned() on the arrayview first, and then collect it to a Vec<f64> and do the to_real_time_vec() and to_complex() conversions
2021-06-30 03:31:14 mdf basically I haven't gotten to profile it correctly yet, since it seems to be a bit tricky (the code is library code which is used by a Python program via PyO3)
2021-06-30 03:31:24 jbg you can use .into_iter().copied().collect() to get an Iterator of f64 from an Iterator of &f64
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2021-06-30 03:31:51 jbg I don't think you need to worry much about the Vec -> DspVec conversion or the DspVec (real) -> DspVec (complex) conversions
2021-06-30 03:31:53 mdf but the function is about 5 times slower than a python equivalent, so I'm guessing the problem is in those conversions or allocations
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2021-06-30 03:32:01 mdf thanks, I'll try that
2021-06-30 03:32:25 jbg the first one is just moving the Vec into the DspVec (which doesn't copy any data, it just moves the (ptr, capacity, len) triple) and the second one is just updating some fields in the DspVec to reinterpret it
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2021-06-30 03:32:59 jbg profiling will tell you where the actual slowness is so that you don't need to guess ;)
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2021-06-30 03:33:54 ssbr I have so many questions about writing procedural macros, it's hard to know where to start. :( Any feedback on the TODOs for my second-ever proc macro? https://bpa.st/PUFQ Especially worried about hygiene -- no idea what the $crate equivalent is for proc macros.
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2021-06-30 03:35:00 jbg mdf: if you're able to use .as_slice() on the ArrayView you can also just directly go from that slice to the DspVec
2021-06-30 03:35:45 jbg if let Some(slice) = array_view.as_slice() { let dsp_vec: DspVec = slice.into(); ... }
2021-06-30 03:36:03 jbg but as_slice() returns None if the array view is discontiguous or not in standard order
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2021-06-30 04:11:09 rk4 OT: anyone know of a room suitable for discussion about performant persistent storage methods, while I might have a rust program it's not really about rust, sled might fit be on topic but rocksdb is looking pretty good to me atm and that's all C++ [w/ a popular rust wrapper :]
2021-06-30 04:11:57 -- sean is now known as se-sm-ca
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2021-06-30 04:25:40 sweater2 If anyone wants to participate in the legendary "ICFPC" contest (Jul 9-12) in one of the top teams, message me. We use rust.
2021-06-30 04:27:08 rk4 i like the idea but i chewed too much lead during key periods in my development
2021-06-30 04:27:19 <-- comatory_ (~ondrejsyn@93.99.127.7) has quit (Ping timeout: 256 seconds)
2021-06-30 04:27:26 * rk4 however is quite resistant to radiation
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2021-06-30 04:33:33 discipulus I've wrapped up Ch.16. I posted practice code for review on the forums. https://users.rust-lang.org/t/feedback-ch-16-multi-threaded-operate-on-non-overlapping-slices-of-vector/61723
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2021-06-30 04:44:50 trev what do you do when two deep dependencies are using a dependency of the same version but different features?
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2021-06-30 04:47:30 trev and they are conflicting
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2021-06-30 04:49:02 rk4 trev: i got shafted with that a few months ago with sqlx :<
2021-06-30 04:50:53 trev rk4 i feel like i'm partially responsible for having a project with massive crate bloat
2021-06-30 04:51:42 j`ey trev: it could happen with as few as 3 crates
2021-06-30 04:52:34 trev j`ey ew 3 crates? that's bloated
2021-06-30 04:52:43 trev need 0 to be safe
2021-06-30 04:53:18 j`ey trev: does that 0 include std/core?
2021-06-30 04:54:29 trev yeah those are fine
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2021-06-30 05:02:29 jbg trev: it's a bug in the dependencies, technically, because features are supposed to be strictly additive
2021-06-30 05:02:54 j`ey jbg: thats what the docs say
2021-06-30 05:02:59 jbg so it's not a problem that different deps select different features, they just get summed and as long as the versions are compatible you'll just have one copy of the dep
2021-06-30 05:03:02 jbg but at a deeper level it's a deficiency in the features system
2021-06-30 05:03:07 j`ey but its convention they arent :P
2021-06-30 05:03:26 jbg generally this gets solved by the shallower deps getting "pass through" features
2021-06-30 05:03:49 jbg so e.g. if library foo uses library bar, and bar has openssl and rustls features
2021-06-30 05:03:59 jbg foo gets bar-openssl and bar-rustls features
2021-06-30 05:04:16 jbg I have started to realise recently that all of my biggest gripes with rust are actually gripes with cargo
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2021-06-30 05:05:47 trev yes
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2021-06-30 05:10:09 gggpkm is it possible to get a raw pointer of int32
2021-06-30 05:10:54 ssbr gggpkm: like `let x : i32 = 0; let my_ptr = &x as *const _;` ?
2021-06-30 05:11:09 jbg gggpkm: I second rk4's earlier advice to read the book and do some self-directed learning of the basics rather than asking the community for the answer to every basic question
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2021-06-30 05:24:36 mdf jbg: thanks for help re. conversions between ndarray and dspvec previously. I got the code a lot cleaner with your tips. however it's as you said that profiling is the way to go, as the guessing didn't actually result in noticiable performance gains :)
2021-06-30 05:24:41 mdf but still, it looks a lot nicer now
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2021-06-30 05:33:18 bertptrs cargo flamegraph is wonderful for profiling when you don't know what to look for
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2021-06-30 05:35:03 jbg mdf: np!
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2021-06-30 06:09:21 la_mettrie i assume as-conversions of literals are not ineffective since they can be made at compile time
2021-06-30 06:10:20 j`ey la_mettrie: you mean inefficient?
2021-06-30 06:10:32 j`ey also you can just write 0u32, no need for `as`
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2021-06-30 06:10:54 la_mettrie *inefficient
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2021-06-30 06:11:26 la_mettrie does that work for 'a' as u8?
2021-06-30 06:11:46 j`ey ah no
2021-06-30 06:11:53 j`ey but b'a' does
2021-06-30 06:12:04 j`ey evalr2: b'a'
2021-06-30 06:12:09 -- Notice(evalr2): j`ey: 97
2021-06-30 06:12:12 la_mettrie okay, that's neat
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2021-06-30 06:27:05 bertptrs as for your original question, yes, those conversions will likely be done at compile time
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2021-06-30 06:28:26 Sobek Just wanted to share, ferris had sneaked into my slides at Dimva, because most of my research code was written in rust. 🦀
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2021-06-30 06:30:01 ssbr So there's proc_macro2::TokenStream and proc_macro::TokenStream -- is there any way to write proc macros s.t. one *only* deals with proc_macro2::TokenStream? I tried my hand at it, but e.g. `syn::parse_macro_input!(x as y)` expects for `x` to be a TokenStream, not a TokenStream2 (while other things are exactly the opposite -- e.g. you can't unquote a TokenStream, but must unquote a TokenStream2)
2021-06-30 06:31:20 ssbr (and anyway, the macro definition only works with TokenStream, not TokenStream2 -- there's no e.g. proc_macro2::proc_macro_attribute)
2021-06-30 06:31:30 ssbr Maybe I've answered my own question at this point
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2021-06-30 07:49:00 mdf bertptrs: thanks for pointing out the flamegraph tool. I was already messing around with perf, but now that I tried out flamegraph, the visualization really helps
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2021-06-30 07:50:00 bertptrs mdf: you're welcome :) after finding flamegraph I haven't profiled with raw perf nor do I feel the need to
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2021-06-30 07:55:59 kupi in rust if I borrow foo, does it get moved to the heap so it can be referenced?
2021-06-30 07:56:09 j`ey no
2021-06-30 07:56:46 j`ey you can reference something on the stack
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2021-06-30 08:00:05 kupi here everything is on the stack except *s1.ptr? https://doc.rust-lang.org/book/img/trpl04-05.svg
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2021-06-30 08:00:37 cehteh what are the types?
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2021-06-30 08:00:46 j`ey probably &str and String
2021-06-30 08:00:54 j`ey kupi: yes
2021-06-30 08:01:09 kupi s1 is String, s is &String
2021-06-30 08:01:31 cehteh but the underlying string data s1.ptr is heap allocated
2021-06-30 08:01:59 kupi cehteh: didn't I say that?
2021-06-30 08:02:25 cehteh err yes .. i shall pay more attention :(
2021-06-30 08:02:32 j`ey btw it's better to say in-place, than stack allocated
2021-06-30 08:02:40 j`ey because you can have a Box<String>
2021-06-30 08:03:17 j`ey if s1 was Box<String>, s1 would be on the heap
2021-06-30 08:03:28 kupi j`ey: what's the difference, can't find anything for "in place allocation"
2021-06-30 08:03:41 j`ey see above ^
2021-06-30 08:03:52 j`ey a String (s1) doesnt have to be on the heap
2021-06-30 08:03:55 j`ey err
2021-06-30 08:03:57 j`ey a String (s1) doesnt have to be on the stack
2021-06-30 08:04:05 j`ey it could be on the heap too
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2021-06-30 08:04:14 j`ey but its ptr always points to the heap
2021-06-30 08:05:53 cehteh i wonder if there is some trick to Cow between an array on stack to a Vec<u8>
2021-06-30 08:06:17 j`ey thats what Cow is!
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2021-06-30 08:07:21 cehteh i thought Cow only works between same type .. err .. but yes 2nd thought
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2021-06-30 08:07:44 cehteh you cant have a vec (data) on stack
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2021-06-30 08:10:24 cehteh btw how works cargo on windows? is that called from cmd.exe or does it come with a unix shell? does cargo depend on any shell command?
2021-06-30 08:10:51 j`ey cargo depends on link.exe I guess
2021-06-30 08:10:57 j`ey dunno what else command wise
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2021-06-30 08:12:02 ssbr If I have a blanket impl for T: Unpin, this causes conflicts with manual impls for Unpin types if they use PhantomPinned, but not if they `impl !Unpin for T`. Why is that? Example: https://play.rust-lang.org/?version=nightly&mode=debug&edition=2018&gist=a878cc111ce0a4b7eaf3547083f385db
2021-06-30 08:12:15 cehteh haha i havent used windows for 20 years, dunno what link.exe is .. just wondering if there is any command i can call from a test portably, just 'echo' would be enough
2021-06-30 08:12:25 me anybody using YouCompleteMe with rust && vim?
2021-06-30 08:12:26 j`ey cehteh: link.exe is the linker
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2021-06-30 08:13:10 me or someone willing to suggest what to use to be able to jump to definition in vim when editing rust files?
2021-06-30 08:13:38 cehteh runtime linker like /lib/ld-linux.so ?
2021-06-30 08:13:51 j`ey cehteh: no, ld
2021-06-30 08:14:21 cehteh oh interesting, didnt know that on windows its a program outside of the dev env
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2021-06-30 08:14:39 cehteh anyway not relevant here
2021-06-30 08:15:07 cehteh anyone here developing rust on windows? :D
2021-06-30 08:15:31 jbg I think the linker would normally be considered a program _within_ the development environment, not outside it
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2021-06-30 08:17:21 jbg just as you need to have gcc (etc) installed to get ld on *nix, you need visual studio (/ the standalone build tools / etc) installed to get link.exe on windows
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2021-06-30 08:19:20 cehteh on most linux distris you have to install binutils, not a full C dev env
2021-06-30 08:20:01 cehteh anyway irrelevent for me
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2021-06-30 08:39:52 kpcyrd I'm confused, I have a Path that prints ".SIGN.RSA.user-5d523e06.rsa.pub" with Debug, but `if path.starts_with(".SIGN.") {` doesn't seem to be true
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2021-06-30 08:41:14 kpcyrd `if path.to_str().unwrap().starts_with(".SIGN.") {` works, but shouldn't the other one too?
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2021-06-30 08:41:37 danieldg I think path-starts-with expects full components
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2021-06-30 08:42:00 kpcyrd ah, hm
2021-06-30 08:42:22 kpcyrd going with `if path.to_str().map(|x| x.starts_with(".SIGN.")).unwrap_or(false) {` then unless somebody has a more elegant idea
2021-06-30 08:42:42 danieldg map_or(false,)
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2021-06-30 08:43:20 kpcyrd neat, thanks
2021-06-30 08:44:01 danieldg converting to osstr and using starts-with there (if it has it) might also be good
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2021-06-30 08:44:53 kpcyrd osstr doesn't seem to have starts_with
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2021-06-30 09:33:57 mike-burns me: vim-lsp
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2021-06-30 09:58:16 kupi kpcyrd: i would `if path.to_str().filter(|x| x.starts_with(".SIGN.")).is_some() {`
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2021-06-30 10:03:15 kupi if you do that more than once, i would write an exists extension function
2021-06-30 10:03:46 kupi then it would be `if path.to_str().exists(|x| x.starts_with(".SIGN.")) {`
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2021-06-30 10:09:48 jbg kupi: but Result doesn't have a filter() method
2021-06-30 10:10:19 kupi i thought it was option :D
2021-06-30 10:10:54 jbg oh it does return Option
2021-06-30 10:10:55 jbg interesting
2021-06-30 10:11:00 jbg I guess there's no useful error
2021-06-30 10:11:36 jbg still seems like some opaque error type would make more sense there
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2021-06-30 11:03:50 kpcyrd is there an easy way to write something like "run this binary, pipe the output to the next binary, then pipe it to another one and then read stdout in a Vec"?
2021-06-30 11:04:08 kpcyrd I got it to work with format! and sh -c, but that's obviously a very bad idea™
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2021-06-30 11:05:11 jbg kpcyrd: did you check the std::process docs?
2021-06-30 11:05:19 jbg they have an example of piping output from one command to another
2021-06-30 11:05:20 lambda kpcyrd: write a shell script? :p
2021-06-30 11:05:21 jbg https://doc.rust-lang.org/std/process/index.html#handling-io
2021-06-30 11:06:47 kpcyrd I was hoping there'd be a less verbose way :)
2021-06-30 11:07:03 jbg I wouldn't really call that code verbose?
2021-06-30 11:07:06 kee Piping is horrible in almost every (non-shell) language.
2021-06-30 11:07:21 jbg if idiomatic rust upsets you, you could write macros that make it look like a shell script
2021-06-30 11:07:31 jbg (at the expense of readability for everyone else who will ever read your code)
2021-06-30 11:09:39 jbg but yeah maybe shell is just a better language for whatever you're writing
2021-06-30 11:09:54 jbg and if you need the output in a rust Vec, just call the shell script from rust
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2021-06-30 11:13:02 nox https://docs.rs/command-macros/0.2.9/command_macros/
2021-06-30 11:14:05 nox https://github.com/rust-shell-script/rust_cmd_lib
2021-06-30 11:14:15 nox kpcyrd: ^
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2021-06-30 11:16:51 kpcyrd I agree the macros are too hard to read, especially regarding quoting
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2021-06-30 11:25:53 kpcyrd seems okayish https://play.rust-lang.org/?version=stable&mode=debug&edition=2018&gist=01ffb019540c75b9d43e46b25bd0bc86
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2021-06-30 11:45:33 kee Is there a good way to .parse() hex literals?
2021-06-30 11:47:15 j`ey from_str_radix
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2021-06-30 11:47:51 j`ey https://doc.rust-lang.org/std/primitive.u32.html#method.from_str_radix
2021-06-30 11:48:49 kee And that handles case fine, so I don't need my second question.
2021-06-30 11:49:26 j`ey a 2 for 1!
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2021-06-30 13:29:18 * carmysilna < https://libera.ems.host/_matrix/media/r0/download/libera.chat/b55efdcd8f8e896af60cd9e626b5bc72427b375c/message.txt >
2021-06-30 13:30:42 dcz_ if this works, I want it
2021-06-30 13:31:18 dcz_ I have failed to make the compiler happy with a trait in the return place on a trait method so far
2021-06-30 13:32:00 * carmysilna < https://libera.ems.host/_matrix/media/r0/download/libera.chat/5623af910baaa1508cbd44da8ada2865f28e183c/message.txt >
2021-06-30 13:32:30 dcz_ oh, you're returning an associated type, not a trait... well I guess that works but isn't a lot better than a hardcoded type
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2021-06-30 14:04:44 cehteh mhm crazy idea: imagine a proc macro wraping functions, whenever you dont use a function return (thats not must-use) it gets logged in debug build
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2021-06-30 14:28:01 trev cehteh what about #[must_use] ?
2021-06-30 14:28:06 trev oh
2021-06-30 14:28:12 trev ignore that
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2021-06-30 14:35:28 bertptrs sounds incredibly noisy
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2021-06-30 14:48:12 cehteh yeah just start of a brainfart, a must #[must_log] may be nice
2021-06-30 14:48:40 cehteh a must_log result gets logged when not used
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2021-06-30 14:51:52 Arnavion I write let () = ... for complicated-looking `...` for that reason, to prove to the compiler and to future readers of the code that I'm not accidentally forgetting to use the result of the `...`. It does mean I have to `#![allow(clippy::let_unit_value)]`
2021-06-30 14:52:18 ssbr Arnavion: I wonder if, instead, every pure function should be marked #[must_use].
2021-06-30 14:52:40 Arnavion Ideally you'd be forced to write let _ = to discard a value you don't want, like in other functional languages like F#'s |> ignore but alas very few Rust users would like that
2021-06-30 14:52:41 ssbr I think about this a lot. Like, shouldn't every getter be marked #[must_use] for example? What's the cost?
2021-06-30 14:53:09 j`ey Arnavion: but how do you turn T into ()?
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2021-06-30 14:53:32 Arnavion j`ey: If it does return a value that I want to ignore, then it'd be let _ =
2021-06-30 14:53:38 j`ey ah
2021-06-30 14:54:20 Arnavion But I think it's pretty rare when I call a function and don't want its return value, especially given the prerequisite that I was talking about complicated functions and not something like BTreeMap::insert()
2021-06-30 14:54:34 Arnavion so I feel the let () = case has been more common in the code I write
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2021-06-30 14:56:11 Arnavion ssbr: If you want that, `clippy::must_use_candidate` is for you
2021-06-30 14:57:01 ssbr Arnavion: I'm googling for this but can't find any docs. What does that do?
2021-06-30 14:57:21 Arnavion Piss you off so that you #![allow] it and curse the clippy devs for ever implementing it
2021-06-30 14:57:35 ssbr oh, apparently https://rust-lang.github.io/rust-clippy/master/ is how you do this -- not findable from google, but is findable from twitter threads
2021-06-30 14:57:37 Arnavion https://rust-lang.github.io/rust-clippy/master/index.html#must_use_candidate
2021-06-30 14:57:43 cehteh be careful there is a difference between let _ = and let _foo =
2021-06-30 14:57:59 ssbr cehteh: my least favorite fact :(
2021-06-30 14:58:04 bertptrs yeah that one confused me at first
2021-06-30 14:58:08 j`ey yeah, not a fun one
2021-06-30 14:58:12 ssbr cehteh: but in any case, `let _ = ...` is correct here, it does the same thing as the implicit discard
2021-06-30 14:58:25 bertptrs I'd argue that they should be the same but that ship has sailed
2021-06-30 14:58:37 Arnavion They shouldn't
2021-06-30 14:58:56 bertptrs It's bikeshedding night then
2021-06-30 14:59:19 Arnavion Otherwise you'd have to do drop(expr); or { expr; } to indicate that you're explicitly ignoring the value, which is just worse
2021-06-30 14:59:23 ssbr Arnavion: w,rt, must_use_candidate: nice. Although I'd probably rather something that enforces it, than just lints and natters annoyingly. sounds like people legitimately hate this, from the google results :/
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2021-06-30 14:59:33 ssbr er, not enforces, but automatically applies
2021-06-30 14:59:40 ssbr (not that it really can, unfortunately)
2021-06-30 14:59:43 bertptrs But less surprising, as _ looks like a valid identifier
2021-06-30 14:59:44 Arnavion ssbr: Yes, that's why I said it'll piss you off
2021-06-30 14:59:58 Arnavion ssbr: I'm not convinced anyone sane likes it
2021-06-30 15:00:00 cehteh how about let __ = ... :)
2021-06-30 15:00:08 ssbr Arnavion: w.r.t. drop(expr), I'm not convinced that's worse :)
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2021-06-30 15:00:34 Arnavion ssbr: But anyway, if you need enforcing, make it part of your CI. Heck, every new project I start has a Makefile with clippy as part of the test target anyway
2021-06-30 15:00:38 ssbr it's certainly different.
2021-06-30 15:00:39 cehteh ssbr: explicit drops are valid and sometimes really nice
2021-06-30 15:00:49 bertptrs What's the false-positive rate on must_use_candidate? How good is it at detecting side effects?
2021-06-30 15:00:58 ssbr cehteh: yes, but the context here is: is that what it should look like to explicitly consume a result that you don't use?
2021-06-30 15:00:59 Arnavion The false-positive rate is 100%
2021-06-30 15:01:02 ssbr vs current-day "let _ = ..."
2021-06-30 15:01:17 bertptrs Then I agree with your assessment that no sane person should use this :P
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2021-06-30 15:01:31 ssbr (C++, btw, uses (void)foo() -- actually quite similar-feeling to drop(foo()))
2021-06-30 15:01:44 Arnavion If tells you that fn add(a: i32, b: i32) -> i32 requires #[must_use] even though only an insane person would call that function and ignore its return value
2021-06-30 15:02:13 cehteh when i started rust i was somewhat surprised that there is #[must_use] and that that isnt default
2021-06-30 15:02:14 bertptrs Makes gcc's -pedantic look tame
2021-06-30 15:02:28 ssbr Arnavion: I have literally encountered exactly that kind of mistake when helping people on IRC (albeit they're usually beginners, and I'm thinking of #python)
2021-06-30 15:02:36 cehteh some #[may_drop] opposite semantic would be more rusty
2021-06-30 15:02:40 Arnavion ssbr: With add(i32, i32) ?
2021-06-30 15:03:03 ssbr Arnavion: string methods that return the new string
2021-06-30 15:03:04 mike-burns Sure: add(x, y) would add y to x, mutating x. Why not, if you're a beginner?
2021-06-30 15:03:10 ssbr Arnavion: so think .replace()
2021-06-30 15:03:22 Arnavion ssbr: My point is specifically about add(i32, i32) -> i32
2021-06-30 15:03:29 mike-burns I wouldn't call them insane, just new.
2021-06-30 15:03:53 bertptrs true, not everyone is blessed with an inate understanding of signature subtleties
2021-06-30 15:03:55 ssbr Arnavion: fine, but that's only "insanity" because people are taught in grade school what addition expressions look like. For almost all other (pure) library functions, #[must_use] makes sense
2021-06-30 15:04:13 Arnavion ssbr: I'm not saying that putting a #[must_use] on add is wrong. I'm saying that it's unnecessary, and that clippy has no way to differentiate between "this function obviously has a significant return" and "this function could do with a #[must_use]"
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2021-06-30 15:04:23 cehteh Arnavion: add(i32, i32) -> i32 would be completely optmized out when the result isnt used
2021-06-30 15:04:31 Arnavion ssbr: There's a reason that #[must_use] is on specific functions in libstd and not on every function
2021-06-30 15:04:38 ssbr Arnavion: of course it's unnecessary, but #[must_use] is always unnecessary
2021-06-30 15:04:49 ssbr it's merely helpful for helping avoid errors on the part of the caller
2021-06-30 15:04:51 Arnavion ssbr: It requires a human to make the determination of when it's useful
2021-06-30 15:05:07 cehteh ssbr: thats the whole point about it :D
2021-06-30 15:05:10 ssbr Arnavion: right. my temptation is to think that it should be on nearly every function.
2021-06-30 15:05:29 bertptrs And to determine "pure"-ness as various crates do side-effects with immutable references.
2021-06-30 15:05:38 * bertptrs *coughs* diesel *coughs*
2021-06-30 15:05:46 ssbr Arnavion: ironically, my exact example does in fact have a must_use in rust: .replace()! neat.
2021-06-30 15:06:32 Arnavion <ssbr> Arnavion: right. my temptation is to think that it should be on nearly every function. < Okay, then as I said clippy::must_use_candidate is made for you
2021-06-30 15:06:37 cehteh bertptrs: simple pureness can be pretty easily deduced -> with the fallaback to impure when not deduceable at compiletime, like dyn calls or other things
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2021-06-30 15:07:15 cehteh #[pure] declaraction may even enforce that and give a compiletime error when it cant be proven to be pure
2021-06-30 15:07:37 cehteh for some traits that would be pretty useful
2021-06-30 15:07:48 bertptrs I write rust to get away from this as this way lies madness, but you'd love my haskell-writing colleagues
2021-06-30 15:07:56 cehteh not necessary, but can help to track logic bugs at runtime
2021-06-30 15:08:32 cehteh bertptrs: as long its an optional help its welcome i'd say
2021-06-30 15:08:40 dcz_ what's the difference between _ and _foo?
2021-06-30 15:08:52 bertptrs _ gets dropped immediately, _foo at the end of the scope
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2021-06-30 15:09:31 dcz_ why would anyone want _foo not to be dropped immediately?
2021-06-30 15:09:52 cehteh because destructor/drop side effects
2021-06-30 15:09:54 Arnavion Mutex lock guard where you don't actually have anything inside the mutex, you're just using it to enforce exclusivity
2021-06-30 15:10:00 bertptrs RAII guards usually for me. I acquire the guard, and I want it to be dropped at the end of the scope, but I do not want to touch it in between
2021-06-30 15:10:20 dcz_ that's annoying
2021-06-30 15:10:21 bertptrs Mutex guards or magic cleanup structs
2021-06-30 15:10:22 cehteh i had this with the TempDir thing which deletes temp dir at the end of the scop
2021-06-30 15:10:44 bertptrs tempdir might be different as you usually want to query its name in between?
2021-06-30 15:11:29 cehteh arguable drop(SomethingWithSideEffect::new()); is more pleasant to let _ = SomethingWithSideEffect::new()
2021-06-30 15:11:53 bertptrs I've wrapped a C lib that had a "call this to do some cleanup" function that I'd need to regularly call, so I wrote a RAII guard that triggered it on drop, regardless of how I exited my function
2021-06-30 15:11:56 cehteh i just hope (didnt test) that the compiler doesnt optimize that out, but iirc it can not
2021-06-30 15:12:10 bertptrs it shouldn't because side effects :D
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2021-06-30 15:12:27 bertptrs Although I prefer SomethingWithSideEffects::new();
2021-06-30 15:12:46 cehteh yes but what if its must_use
2021-06-30 15:13:25 bertptrs Then I squint real hard at the crate author who decided that a thing where I don't need or want the result is #[must_use]
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2021-06-30 15:13:43 bertptrs (and go for the let _ option)
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2021-06-30 15:15:38 Arnavion My preference is to use drop() for the case where I have some value created earlier that I now want to end its scope. So I'd drop(mutex_guard); but I would rather let _ = function_whose_value_I_want_to_ignore();
2021-06-30 15:16:07 bertptrs true, let _ for dropping immediately, drop() for later
2021-06-30 15:16:28 bertptrs more clearly conveys intent. "this was useful but now it's not."
2021-06-30 15:16:34 Arnavion Yes, exactly
2021-06-30 15:16:40 cehteh ok
2021-06-30 15:17:39 ssbr yeah, but calling drop hygienically from a macro is annoying~
2021-06-30 15:17:50 Arnavion dcz_: _ is special anyway. You can multiple _ pats at the same time but two _foo would conflict
2021-06-30 15:18:05 Arnavion You can *have*
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2021-06-30 15:18:29 dcz_ isn't one _foo going to shadow the other?
2021-06-30 15:18:39 Arnavion I'm talking about two _foo in the same pat
2021-06-30 15:18:45 dcz_ or do you mean destructuring?
2021-06-30 15:18:48 Arnavion match (1, 2) { (_, _) => () } is valid
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2021-06-30 15:18:55 Arnavion match (1, 2) { (_foo, _foo) => () } is not
2021-06-30 15:19:02 bertptrs not if used in the same pattern match, e.g. if let (Some(_foo), Some(_foo)) = bar
2021-06-30 15:19:40 dcz_ is the expectation that someone might actually want to use the _foo?
2021-06-30 15:19:47 Arnavion Yes
2021-06-30 15:19:51 ssbr happily, just checked, also true for function definitions. (Can define multiple _ parameters.)
2021-06-30 15:20:05 dcz_ I'm even more conflicted now
2021-06-30 15:20:06 Arnavion It's no different from `foo` other than it suppresses `unused` diagnostics
2021-06-30 15:20:24 cehteh matching on tuples allows pretty nice tight code, saves a lot nesting and special casing
2021-06-30 15:20:43 Arnavion ssbr: Yes, especially useful for trait implementations
2021-06-30 15:21:04 cehteh if let (Some(n), Some(m)) = (n, c.name(n.unwrap_or_default())) { .. just did that here :D
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2021-06-30 15:21:55 dcz_ I usually end up matching on tuples with the pieces of the value computed before the match statement
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2021-06-30 15:22:45 dcz_ basically as a way to avoid a mess of conditionals in favor of a lookup table
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2021-06-30 15:24:25 cehteh yep
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2021-06-30 16:54:00 nemo Is https://slightknack.github.io/rust-abi-wiki/ dead? There's been no commits since last year
2021-06-30 16:54:15 nemo thought it'd be an interesting doc to understand the issues and plans
2021-06-30 16:54:20 nemo but it seems to kinda just petre out
2021-06-30 16:54:41 nemo *er
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2021-06-30 16:56:19 bertptrs I didn't know there were plans to stabilize the ABI at all. People consider not having one a feature
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2021-06-30 16:58:49 dcz_ people also consider not having on an impediment :)
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2021-06-30 17:00:13 bertptrs both side are sort of right, which is how you get in a stalemate
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2021-06-30 17:10:30 Arnavion Just make sure that both sides of the linkage are compiled with the same compiler and flags, same as C++, and you won't need a stable ABI
2021-06-30 17:11:03 bertptrs C++ has a de-facto ABI though
2021-06-30 17:11:27 Arnavion Not when both sides of the linkage are compiled with different compiles and flags
2021-06-30 17:11:28 bertptrs It's the reason for most terrible things in the stl
2021-06-30 17:11:57 Arnavion eg std::string in the API fails to link because one side compiled std::string with --std=c++11 and the other side with 17
2021-06-30 17:11:58 bertptrs IIRC mixing clang and gcc goes reasonably well as they both use the Itanium abi
2021-06-30 17:13:51 cehteh big parts of the llvm/clang success story is that they gone lengths to support nonstandard gcc stuff
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2021-06-30 17:14:37 Arnavion That doesn't change what I said
2021-06-30 17:14:46 Arnavion Also gcc and clang don't have the same definition of std::string in the first place
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2021-06-30 18:32:12 meltyness 6 more chapters!! woo-hoo!
2021-06-30 18:32:52 cehteh when done start from the beginning, do that 3 times :D
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2021-06-30 18:34:09 meltyness I'm kinda vaguely interested in the uhh intermediate representations and static analysis rust is undoubtedly really meant for
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2021-06-30 18:35:21 meltyness yeah all that stuff in the rust-dev-guide looks pretty cool'
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2021-06-30 19:11:01 meltyness ........ what?!
2021-06-30 19:14:39 ssbr meltyness: what
2021-06-30 19:15:20 meltyness i've contrived a trivial test for how rust treats a wrapping add
2021-06-30 19:16:08 meltyness the optimizing steps taken in --release make my computer seem really really fast when I don't need to see any of its work
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2021-06-30 19:17:28 meltyness basically -- "count to u64::MAX and then print 0 when you're done" runs instantly
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2021-06-30 19:18:42 j`ey no need to do that counting if there's no side effects!
2021-06-30 19:19:20 meltyness something like the elision rules, but for arithmetic?
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2021-06-30 19:20:55 j`ey just normal optimisation
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2021-06-30 22:15:27 discipulus do people use gdb or lldb to debug rust code?
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2021-06-30 22:20:05 cehteh how about assert & logging?
2021-06-30 22:20:16 sol ]/window 1
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2021-06-30 22:22:47 cehteh + proper tests, start test driven, and one test for each bug thats not trivial to fix
2021-06-30 22:23:19 mike-burns Both rust-lldb and rust-gdb exist. So far as I can tell, use the one you're most comfortable with.
2021-06-30 22:23:39 mike-burns This channel is a funny mix of people who come from C++ and people who come from Haskell.
2021-06-30 22:24:22 cehteh i rarely use a debugger, in any language
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2021-06-30 22:24:45 neshpion i only used a debugger a couple of weeks ago for the first time
2021-06-30 22:24:48 mike-burns The debugger is part of programming C, so I use it a lot.
2021-06-30 22:25:12 cehteh almost never used a debugger in C
2021-06-30 22:25:29 mike-burns That's a choice.
2021-06-30 22:25:48 cehteh yes sure, but saves a lot time when you dont have to
2021-06-30 22:26:34 mike-burns I don't mean "debugging with gdb is part of C", I mean that gdb is the C REPL. Using it is part of the programming process.
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2021-06-30 22:27:02 mike-burns But if it works for you without, that's fine too.
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2021-06-30 22:34:54 towel What's the recommended way to use recursive enums in Rust? I would like to avoid unsafe code and keep everything typed if possible. Looking to do something akin to this: `enum Expr { Plus(Expr, Expr), Sub(Expr, Expr) };`
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2021-06-30 22:39:00 GreenJello towel, Box<Expr>
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2021-06-30 22:39:31 towel Sounds good, thanks for the recommendation GreenJello
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2021-06-30 22:52:23 meltyness uhhhhhhhhhhhhhhhhhhh
2021-06-30 22:52:37 meltyness https://doc.rust-lang.org/std/hash/trait.Hasher.html what algorithm does this use by default and its not in the manual
2021-06-30 22:55:17 GreenJello meltyness, HashMap has a generic that defaults to this: https://doc.rust-lang.org/std/collections/hash_map/struct.RandomState.html
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2021-06-30 22:56:00 GreenJello which references this: https://doc.rust-lang.org/std/collections/hash_map/struct.DefaultHasher.html
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2021-06-30 22:57:10 GreenJello it's currently SipHash (and has been for years)
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2021-06-30 22:59:55 meltyness I guess the std hashing algorithm isn't really intended as part of a cryptographic or security library
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2021-06-30 23:01:58 gggpkm_ https://play.rust-lang.org/?version=stable&mode=debug&edition=2018&gist=c5499b7dc12d1a0e77ca157bd205c354
2021-06-30 23:01:59 GreenJello yeah, it's only really suitable for hash table collections
2021-06-30 23:03:09 GreenJello I can't immediately think of where else you'd use it, especially since it's only a 64 bit hash
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2021-06-30 23:04:38 GreenJello gggpkm_, do you have a question?
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2021-06-30 23:19:17 fancycade Does anyone know if there is a channel for gtk-rs?
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2021-06-30 23:23:30 jbg fancycade: https://gtk-rs.org/contact
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2021-06-30 23:23:37 jbg there's a #rust on the gnome IRC server
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2021-06-30 23:24:03 jbg oh wait no that's matrix not IRC
2021-06-30 23:24:27 i3d Is there a way in rust to say Vec<Display>, meaning a collection of objects that impls a certain trait?
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2021-06-30 23:24:44 jbg the term for objects that impl a certain trait is "Trait Object"
2021-06-30 23:24:55 i3d ok
2021-06-30 23:24:56 jbg and they look like &dyn Trait or Box<dyn Trait>
2021-06-30 23:25:15 i3d so something like Vec<dyn Display>?
2021-06-30 23:25:15 jbg the values in the Vec need to be all the same size, so you can't directly do Vec<dyn Trait> since the stride would not necessarily be consistent
2021-06-30 23:25:19 jbg no
2021-06-30 23:25:32 jbg either Vec<&dyn Display> (a vec of references to things that impl Display)
2021-06-30 23:25:42 jbg or Vec<Box<dyn Display>> (a avec of owned things that impl Display)
2021-06-30 23:25:52 i3d oh...
2021-06-30 23:26:11 i3d am I understanding right that those are all just pointer types?
2021-06-30 23:26:28 jbg kind of depends what aspect of pointer you are talking about
2021-06-30 23:26:42 jbg they are, but the Box owns the data, you don't need other storage for the data
2021-06-30 23:26:57 jbg with Vec<&dyn Display> the values would need to be stored elsewhere outside the Vec
2021-06-30 23:27:10 i3d I see
2021-06-30 23:27:23 jbg but with Vec<Box<dyn Display>> the values are on the heap, the vec contains pointers to them, but the vec also owns them. they'll be dropped when the Vec is dropped
2021-06-30 23:27:31 i3d Does Box consider like a fat-pointer?
2021-06-30 23:27:41 jbg Box<dyn Display> is a fat pointer yes
2021-06-30 23:28:05 jbg Vec<dyn Display> would be impossible, because different things that impl Display might have different size
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2021-06-30 23:28:35 jbg so indexing into the vec would not be possible
2021-06-30 23:29:29 i3d ok great, thanks! So "Trait" as a thing doesn't have a known size at compile time... that's kinda interesting. In Go, the interface{} type is always a pointer of the actual object, so it's like a fat-pointer in Rust, so it can directly be used as the type in collections.
2021-06-30 23:29:47 Mutabah Yep
2021-06-30 23:29:53 Mutabah Rust is more explicit about pointers/indirection
2021-06-30 23:30:11 jbg if you consider e.g. the trait Display, and the variety of things that implement it, it's clear it can't have a known size at compile time
2021-06-30 23:30:21 jbg I can make an 8MB struct that impls Display yet "" also impls it
2021-06-30 23:30:32 i3d So can I consider that "Trait" doesn't really have memory representation? It's all about just contract?
2021-06-30 23:30:45 Mutabah Quick side note: Traits are interfaces, and you can either use them as trait objects OR as bounds to generics
2021-06-30 23:31:52 i3d The thing is if "Trait" is implemented as like a fat-pointer, then it would have a fixed known size (just a machine size pointer).
2021-06-30 23:32:11 jbg the fat pointers are like &dyn Trait or Box<dyn Trait>
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2021-06-30 23:32:17 jbg the trait itself is just an interface
2021-06-30 23:32:34 jbg so Vec<dyn Trait> doesn't make sense (Vec of things that have a certain interface -- size is not known)
2021-06-30 23:32:38 cehteh enum DisplayObject {...} and Vec<DisplayObject> would be also an alternative
2021-06-30 23:32:50 jbg Vec<&dyn Trait> and Vec<Box<dyn Trait>> make sense - vec of fat pointers
2021-06-30 23:32:53 i3d jbg: ok, it's still a bit hard to understand but I think I kinda get the idea
2021-06-30 23:33:42 i3d cehteh: true.. but it's a bit ugly as it's hard to emuerate all possibilities.
2021-06-30 23:34:04 cehteh yes depends on how dynamic you want it
2021-06-30 23:34:11 jbg in the Vec<dyn Trait> concept, the actual structs that implement the trait are supposed to be in the Vec
2021-06-30 23:34:17 jbg as opposed to pointers to them
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2021-06-30 23:36:27 Mutabah Hackery - I can think of ways of making a `HVec<dyn Trait>` (an indexable list of all the same type), and I _have_ made a `Stack<dyn Trait>` (with different types, but you can only push/pop off one end, no indexing)
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2021-06-30 23:37:32 cehteh you could even have hybrid appoaches enum DisplayObject {Cursor(x,y), Box(x,y,width,height), Extension(Box<dyn ExDisplayObject>)} (dont mind the wrong syntax here for easier reading)
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2021-06-30 23:37:40 i3d Am I understand right that there is so far no std Trait for numeric types right? e.g. I wanted to say creating a collection of all types that can support "+".
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2021-06-30 23:37:56 jbg https://doc.rust-lang.org/std/ops/trait.Add.html
2021-06-30 23:38:01 jbg there's also the num_traits crate
2021-06-30 23:38:38 i3d ah... std::ops.. cool, thanks!
2021-06-30 23:38:41 jbg it has to be a collection of all types that can support + with a given RHS and result type, not just all types that can support +
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2021-06-30 23:39:28 jbg but num-traits has generic things like Num which is implemented for f* i* u*
2021-06-30 23:39:39 jbg as well by some numeric types in other crates
2021-06-30 23:40:00 i3d I see. will check that out.
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2021-06-30 23:46:53 fancycade jbg thanks, i need to connect to gnome irc server
2021-06-30 23:47:06 jbg gnome matrix I think actually
2021-06-30 23:47:12 jbg I mistook it for an IRC channel at first
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2021-06-30 23:47:21 jbg maybe it's bridged though
2021-06-30 23:47:25 fancycade i think there is both
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2021-06-30 23:47:52 fancycade ill try the matrix channel
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2021-07-01 03:25:57 bertptrs silly idea with a use case: NonEmptyVec. Since an empty vec does not allocate, this creates a useful niche where size_of::<Option<NonEmptyVec>>() couldequal size_of::<NonEmptyVec>()
2021-07-01 03:27:32 bertptrs Analogous to NonZeroX
2021-07-01 03:27:40 jbg but size_of::<Vec<T>>() already == size_of::<Option<Vec<T>>>()
2021-07-01 03:27:54 bertptrs Is it? :o
2021-07-01 03:28:08 jbg a vec is struct with three fields: a pointer, a len and a capacity
2021-07-01 03:28:20 jbg the Option::None case can just set the pointer to 0
2021-07-01 03:28:41 bertptrs evalr2: std::mem::size_of::<Vec<i32>>(), std::mem::size_of::<Option<Vec<i32>>>()
2021-07-01 03:28:44 -- Notice(evalr2): bertptrs: error: expected one of `.`, `;`, `?`, `}`, or an operator, found ...
2021-07-01 03:28:45 -- Notice(evalr2): bertptrs: https://play.rust-lang.org/?version=stable&mode=debug&edition=2018&gist=2b73569a7c4adcfa0d18d8dc1ebacf3a
2021-07-01 03:28:55 bertptrs evalr2: (std::mem::size_of::<Vec<i32>>(), std::mem::size_of::<Option<Vec<i32>>>())
2021-07-01 03:28:58 -- Notice(evalr2): bertptrs: (24, 24)
2021-07-01 03:29:01 bertptrs neat
2021-07-01 03:29:24 bertptrs Okay that's less of a use case. I still liked the implicit "this is not empty" but I can do without
2021-07-01 03:29:32 jbg it makes no difference to size_of::<Vec<T>> whether the vec contains any elements or not
2021-07-01 03:30:12 jbg also you'd need a new way to initialise the vec right?
2021-07-01 03:30:45 jbg ah no, you could use from_elem or init it from a boxed slice
2021-07-01 03:30:46 bertptrs Same as you do for NonZeroX, yes
2021-07-01 03:30:58 bertptrs Or init from an actual vec and check
2021-07-01 03:31:00 jbg was just thinking you couldn't new() and then push but there are other ways
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2021-07-01 03:32:53 bertptrs you could even write not_empty_vec![…] and make sure that the pattern disallows being empty
2021-07-01 03:34:39 jbg mm
2021-07-01 03:35:09 jbg one thing that constantly bugs me is that Vec::first() returns Option<&T> but Vec::remove(0) returns T and panics if the Vec is empty
2021-07-01 03:35:21 jbg your NotEmptyVec would solve that in some cases :)
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2021-07-01 03:36:29 bertptrs NotEmptyVec also kind of has to panic if you remove element zero, but at least first() would work
2021-07-01 03:36:56 jbg well, what I really want is a method that consumes the vec and returns the first element
2021-07-01 03:36:57 bertptrs as would last
2021-07-01 03:37:04 bertptrs into_first()
2021-07-01 03:37:10 jbg I have to deal with a bunch of APIs that return arrays with exactly one element
2021-07-01 03:37:12 bertptrs and into_last()
2021-07-01 03:37:21 bertptrs oh that's super weird
2021-07-01 03:37:23 jbg of course NotEmptyVec is not ideal there; maybe the API returns an empty array one day
2021-07-01 03:38:41 jbg Vec could already have an into_first() -> Option<T>, it just doesn't
2021-07-01 03:39:07 jbg I wonder what the rationale for remove() not returning an Option is
2021-07-01 03:39:24 bertptrs it has one, kinda. .drain().next()
2021-07-01 03:39:49 jbg .drain(..).next() yeah, but it's a little unclear at first to some people reading the code
2021-07-01 03:40:41 bertptrs alternatively into_iter().next() if you don't like the range in there
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2021-07-01 03:43:48 jbg yeah. there are various alternatives, it just seems inconsistent that remove panics rather than returning an Option
2021-07-01 03:44:01 jbg too late to change of course
2021-07-01 03:45:12 Arnavion What's the rationale for any of the slice methods that panic, really
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2021-07-01 03:47:20 Arnavion Also, perhaps you want VecDeque with its pop_front() instead (which also saves on moving everything behind it)
2021-07-01 03:48:23 jbg in most cases when I want to take the first element, I know there's at most one element and the stupid API I'm interfacing with just wraps it in an array, so the efficiency thing is not relevant, but that's a good tip on VecDeque, I can deserialise into that and use pop_front, it's certainly tidier
2021-07-01 03:48:25 Arnavion bertptrs: Not only does the compiler look inside multiple layers of structs to find niches, it also considers all fields and not just the first one. It can use niches from fields that aren't the first one even without reordering to make it the first one
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2021-07-01 03:50:43 bertptrs Ah, I hadn't realized that Unique had a niche
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2021-07-01 04:23:25 osa1 is there a way to get backtrace of a panic in a panic handler? I can't see anything relevant in PanicInfo docs
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2021-07-01 04:26:38 osa1 hm, I think I can do Backtrace::capture(), but it's in std so I can't use it
2021-07-01 04:32:05 Arnavion backtrace::{trace,resolve,resolve_frame}_unsynchronized() work without the std feature enabled
2021-07-01 04:33:26 osa1 is that a crate? backtrace distributed with Rust is only available in std
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2021-07-01 04:33:53 osa1 if you mean https://crates.io/crates/backtrace, it requires alloc
2021-07-01 04:34:40 Arnavion You said nothing about disallowing alloc
2021-07-01 04:34:56 osa1 Yeah I'm saying it now
2021-07-01 04:35:07 osa1 I can only use core
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2021-07-01 04:35:31 osa1 Perhaps I can allow alloc for debugging though
2021-07-01 04:36:53 Arnavion (And yes, I meant that crate, which predates libstd's API and is also what backs it)
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2021-07-01 04:54:48 gggpkm how can I get the type of variable at runtim
2021-07-01 04:54:50 gggpkm e
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2021-07-01 04:55:49 jbg what for?
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2021-07-01 04:57:57 jbg gggpkm: if you have something like a Box<dyn Any> or Box<dyn Error> and want to find out what is behind the trait object, you want to look up "downcasting"
2021-07-01 04:58:20 jbg but the type of variables is known at compile time; in general there is no purpose in finding it out at runtime
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2021-07-01 05:55:19 gggpkm impl Server<AddrIncoming, ()> ,what is () here
2021-07-01 05:55:51 trev "unit"
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2021-07-01 05:56:06 trev https://doc.rust-lang.org/std/primitive.unit.html
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2021-07-01 06:01:37 jbg colloquially, "nothing"
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2021-07-01 06:17:54 bertptrs Formally, a tuple with zero elements
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2021-07-01 06:26:33 gggpkm_ how to let vim show out warning by ale
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2021-07-01 06:53:39 bertptrs this channel is not google, mate
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2021-07-01 06:55:32 la_mettrie this is infoseek
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2021-07-01 07:04:41 nox Nothing is actually
2021-07-01 07:04:49 nox Nothing is actually `!`, not `()`
2021-07-01 07:05:10 jbg well... yeah
2021-07-01 07:05:16 jbg () is a value so it's not really nothing
2021-07-01 07:05:26 jbg but ! is really never, not nothing
2021-07-01 07:05:36 jbg not returning is different from returning nothing
2021-07-01 07:05:45 j`ey Result<!, ()>
2021-07-01 07:05:56 jbg Result<!, !>
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2021-07-01 07:06:38 j`ey thats basically -> ! :P
2021-07-01 07:06:59 jbg I might never return successfully, or I might never return with an error
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2021-07-01 07:10:29 Sobek I wonder what clippy and rustc make of -> Result<!,!>
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2021-07-01 07:17:17 j`ey Sobek: should be fine!
2021-07-01 07:19:27 bluss the never (!) type is not stable yet, so it's a feature that's yet to come (stable perspective) :)
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2021-07-01 07:20:30 jbg I thought it was stable in return types
2021-07-01 07:21:08 jbg ah, only *as* the return type, not *in* return types
2021-07-01 07:21:25 j`ey yeah just -> !
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2021-07-01 07:22:04 bluss in stable Rust, ! is not really a type
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2021-07-01 07:36:48 bertptrs Which is why Result<T, Infallible> exists
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2021-07-01 07:37:46 bihtori Why not just.. T?
2021-07-01 07:37:51 nox And Infallible is also nothing, just a different kind of nothing :p
2021-07-01 07:38:08 nox bihtori: For things that are infallible but must return Result<_, _>.
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2021-07-01 07:38:19 nox bihtori: E.g. an infallible TryFrom implementation.
2021-07-01 07:38:40 bertptrs bihtori: because you might be implementing trait Foo { type ErrorType; fn bar() -> Result<i32, Self::ErrorType>; }
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2021-07-01 07:39:28 bihtori Oh, the associated types in traits force it for sure.
2021-07-01 07:40:43 trev the real question is, which is nicer looking "Infallible" or "!" ?
2021-07-01 07:41:06 bertptrs "!" imo, if only for consistency, but alas we're not there yet
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2021-07-01 07:52:18 ssbr I have a procedural macro which wraps another procedural macro, but now users must depend on both, even though they only directly use one (the other is still used, but... behind a procedural macro). Is there any way around this, to e.g. make ::proc_macro2_crate available when you depend on ::proc_macro2_crate?
2021-07-01 07:52:35 ssbr this doesn't happen with normal macros, because they use $crate, not ::crate_name -- is there maybe an equivalent of $crate for proc macros?
2021-07-01 07:53:39 Rust Feuermagier_: aha!
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2021-07-01 07:55:00 gggpkm what is the common name use of rt.rs
2021-07-01 07:57:34 j`ey gggpkm: I dont understand that question
2021-07-01 07:57:46 gggpkm rt.rs
2021-07-01 07:57:55 gggpkm name is common
2021-07-01 07:58:22 j`ey gggpkm: ive never seen that name before
2021-07-01 07:58:28 j`ey gggpkm: what makes you say it is common?
2021-07-01 07:59:40 gggpkm really :(
2021-07-01 08:00:11 j`ey gggpkm: where have you seen rt.rs?
2021-07-01 08:00:41 gggpkm hyper code
2021-07-01 08:01:28 trev you want to use the module in another file?
2021-07-01 08:01:30 j`ey rt = runtime, it says at the top: https://github.com/hyperium/hyper/blob/master/src/rt.rs#L1
2021-07-01 08:01:40 trev lol
2021-07-01 08:02:03 bertptrs can you please speak in complete sentences you are really hard to understand
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2021-07-01 08:03:42 mike-burns (Their IP is not for an English-speaking country.)
2021-07-01 08:03:50 bertptrs Neither is mine
2021-07-01 08:04:15 gggpkm j`ey, at the top ?
2021-07-01 08:04:51 j`ey gggpkm: look at the line I linked to
2021-07-01 08:04:53 gggpkm j`ey, executor is for async ?
2021-07-01 08:04:59 j`ey //! Runtime components
2021-07-01 08:05:05 j`ey rt = runtime
2021-07-01 08:05:16 j`ey yeah Executor is for async
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2021-07-01 08:08:01 gggpkm this file does not impoty Fut ,but it uses Fut
2021-07-01 08:08:16 j`ey gggpkm: line 9
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2021-07-01 08:08:35 gggpkm what's the magic
2021-07-01 08:08:36 j`ey gggpkm: thats a generic
2021-07-01 08:08:43 j`ey no magic
2021-07-01 08:09:31 gggpkm pub trait Executor<Fut>
2021-07-01 08:09:39 gggpkm where is the Fut from
2021-07-01 08:09:55 j`ey there
2021-07-01 08:10:03 j`ey thats declaring Fut
2021-07-01 08:10:08 j`ey its not from anywhere
2021-07-01 08:10:26 mike-burns https://doc.rust-lang.org/book/ch10-01-syntax.html - here's the book's chapter on generics, like Fut.
2021-07-01 08:12:28 jbg this will be the third time gggpkm has been linked to the book, not sure if they will read it this time either :)
2021-07-01 08:13:12 mike-burns Heh fair enough.
2021-07-01 08:13:12 j`ey https://doc.rust-lang.org/rust-by-example/generics.html might be better
2021-07-01 08:13:26 j`ey since its examples (apparently)
2021-07-01 08:14:12 gggpkm ah
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2021-07-01 08:14:51 gggpkm I think it as the std's Fut
2021-07-01 08:15:15 gggpkm it's virtual indeed
2021-07-01 08:15:42 j`ey generic, not virtual
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2021-07-01 08:16:11 gggpkm I think it just is a literal placeholder
2021-07-01 08:16:21 mike-burns Yup.
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2021-07-01 08:18:35 jbg it's just a name, you can replace all occurrences of Fut there with Foo or F or Beeblebrox and nothing changes.
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2021-07-01 08:19:04 j`ey jbg: even Zephod?
2021-07-01 08:19:26 jbg I think that would be a compile error, Zaphod would be ok though
2021-07-01 08:19:41 j`ey jbg: ouch, i failed
2021-07-01 08:21:32 gggpkm is vim lsp powerful ?
2021-07-01 08:21:52 jbg this channel is not google
2021-07-01 08:22:09 gggpkm is vim lsp for rust powerful ?
2021-07-01 08:22:14 jbg lol
2021-07-01 08:22:22 jbg touche
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2021-07-01 08:22:47 mike-burns rust-analyzer is powerful.
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2021-07-01 08:29:30 trev lol add "for rust" to anything to keep it on topic
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2021-07-01 08:34:07 Shell are dogs heckin' good puppers, for rust?
2021-07-01 08:34:23 me any idea for a crate that can parse c-escaped strings? (something like "a\nhello\r\n\x33\x22")
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2021-07-01 08:34:43 ssbr gggpkm: nice save
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2021-07-01 08:49:31 hoistbypetard hi all... in rust, is there a common way to initialize a HashMap from a literal? in python, i'd do this: `foo = { 'bar': 42, 'baz': 24 }`
2021-07-01 08:49:56 -- Rust is now known as ButtRs
2021-07-01 08:50:23 j`ey hoistbypetard: map-lit crate
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2021-07-01 08:52:57 hoistbypetard thanks. that looks like just what i want.
2021-07-01 08:53:19 jbg me: maybe overkill but I think nom can do it with nom::bytes::complete::escaped or so
2021-07-01 08:54:44 me I've found "unescape" crate, which is almost undiscoverable as it is not documented at all
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2021-07-01 09:42:51 gggpkm ping
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2021-07-01 09:45:53 cehteh pong
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2021-07-01 09:46:34 Sobek | . |
2021-07-01 09:47:22 cehteh | | .
2021-07-01 09:47:26 cehteh you loose
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2021-07-01 09:47:39 Sobek :D
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2021-07-01 11:31:13 sol ]/window 21
2021-07-01 11:31:34 bertptrs I much prefer window 23 myself
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2021-07-01 12:35:41 _Vi How do I get from `(u32, &String)` to `&(u32, String)` without a clone? Naive way leads to "cannot move out of ...".
2021-07-01 12:36:09 GreenJello you can't
2021-07-01 12:37:06 _Vi Is indexing HashMap by a tuple like `(u32, String)` a good idea in general?
2021-07-01 12:39:15 GreenJello if you're trying to use it as a two dimensional hashmap, I'd probably go with HashMap<u32, HashMap<String, T>>, but I don't know that a tuple is always worse
2021-07-01 12:40:19 GreenJello it's probably worse if any part of the key isn't Copy, though
2021-07-01 12:43:54 _Vi Indeed, looks like `string_interner::DefaultSymbol` is a better choice.
2021-07-01 12:44:44 danieldg _Vi: this is the reason raw_entry exists for HashMap
2021-07-01 12:45:17 danieldg 2-dimensional hashmaps are a lot more wasteful of memory
2021-07-01 12:46:05 cehteh tuple (or enum) would be as good as hashing thereof is
2021-07-01 12:46:29 cehteh and Eq
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2021-07-01 12:46:57 danieldg you can also kinda do this with a custom key - or in this case, having the type be (u32, Cow<'static, str>)
2021-07-01 12:47:44 danieldg that's a bit less efficient than (u32, String) but only one usize per entry; better than the layered hashmap
2021-07-01 12:48:13 cehteh do you expect hundreds, thousands, millions of keys?
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2021-07-01 12:49:09 cehteh i just did that in a non size/performance critical part, copying things and done, if that poses a problem its a implementation detail that can be changed later
2021-07-01 12:49:33 danieldg if you expect tons of keys, String is not as good a key as Box<str>/Rc<str>/Arc<str>
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2021-07-01 12:53:44 danieldg actually I'm not sure Cow would be good enough here - depends on how lifetime rules work
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2021-07-01 12:57:11 cehteh in a another thing i have something enum Entry {Free(usize), Used(Something)} ... and then a struct Stored { data: Vec<Entry>, firstfree: usize} ... mapping Somethings to unique usize identifiers and then look that up in a hash map
2021-07-01 12:59:14 cehteh slightly special case here (even uses an Arc for other reasons) but with that you can decouple the actual data storage from the lookup
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2021-07-01 14:10:08 Polochon_street hi! I'm trying to have a function in a trait that returns an Iterator on something that depends on operations ran in different threads started in that function
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2021-07-01 14:10:17 Polochon_street I have https://play.rust-lang.org/?version=stable&mode=debug&edition=2018&gist=ca3526eb72a8d9842485e78674f6c21e, which seems to work, but was wondering if I left footguns there?
2021-07-01 14:10:35 Polochon_street like, what if my `do_something` panics? Should I worry about that?
2021-07-01 14:11:16 Shell you don't have to manually drop(tx_thread)
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2021-07-01 14:12:58 Polochon_street but the rest looks good? I'm kind of worried that I never join the threads, but at the same time, I know the receiver.iter() will wait until all tx are dropped, so maybe it's good as it is
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2021-07-01 14:14:15 Shell aside from that... if do_something panics or returns an Err, that thread will exit and not do anything. you can try it: https://play.rust-lang.org/?version=stable&mode=debug&edition=2018&gist=c91dca5491aada7c30c7b6404b6b7cc7
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2021-07-01 14:17:53 Polochon_street there's no way to get an Err similarly to this https://doc.rust-lang.org/std/thread/struct.JoinHandle.html#method.join, right?
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2021-07-01 15:29:17 fivemillion I don't really understand how shared state concurrency is supposed to work under rust
2021-07-01 15:29:57 fivemillion suppose there's an image loader, which loads images incrementally, and the result is written to a shared memory "frame buffer"
2021-07-01 15:30:05 fivemillion what would this look like in rust?
2021-07-01 15:31:19 GreenJello fivemillion, https://doc.rust-lang.org/book/ch16-03-shared-state.html
2021-07-01 15:31:43 fivemillion yeah of course I tried to read this
2021-07-01 15:32:00 fivemillion but I don't really understand
2021-07-01 15:32:05 fivemillion I'm coming from C, if you wonder
2021-07-01 15:32:08 fivemillion in C this is very simple
2021-07-01 15:32:31 fivemillion you just have a pointer to the pixel data, and there are "implicit" rules how to access the pointer
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2021-07-01 15:34:12 trev just wrap in Arc<RwLock<State>> and pass around
2021-07-01 15:34:19 trev what didn't you understand?
2021-07-01 15:34:43 fivemillion well, first, for a C programmer, double nested templates seem very roundabout
2021-07-01 15:35:07 fivemillion I have to look closer at this
2021-07-01 15:35:44 trev it's for your own safety:tm:
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2021-07-01 15:38:40 fivemillion well it literally says Arc is Rc, but thread-safe, but is RwLock really needed? I'm sorry I'm just trying to get the big picture
2021-07-01 15:38:41 GreenJello I don't really understand the requirements here. Things don't always translate well 1:1 with C
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2021-07-01 15:39:33 fivemillion C is often described as a portable assembler, and I expect that Rust as a systems programming language can achieve the same thing easily
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2021-07-01 15:39:54 fivemillion C is just a thing layer over the mode the CPU/OS provides
2021-07-01 15:40:10 fivemillion the OS simply provides threads that can access the same memory
2021-07-01 15:40:11 GreenJello it can, but if you try to use it like C, then you get none of the benefits of Rust
2021-07-01 15:40:52 saati that's a dangerously inaccurate picture of C
2021-07-01 15:40:58 fivemillion that's OK, I'm fine with getting the benefits of rust in other areas
2021-07-01 15:41:09 fivemillion saati, I disagree
2021-07-01 15:41:25 fivemillion mostly because Unix is defined in terms of POSIX
2021-07-01 15:41:31 Karel C is portable assembly with an adversary in the middle that tries to prove as much of your code as undefined
2021-07-01 15:41:50 fivemillion true enough, but you could literally blame compiler vendors for this
2021-07-01 15:42:25 fivemillion I don't think the original C inventors imagined nasal demons
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2021-07-01 15:43:54 fivemillion the thing about rwlocks I hate is that readers can't upgrade to writers atomically
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2021-07-01 15:46:34 GreenJello the parking_lot crate has an RwLock with upgradable read locks
2021-07-01 15:47:40 fivemillion anyway in C I'd rarely consider rwlocks because they tend to be error prone, but that's not the point anyway and not what I wanted to ask
2021-07-01 15:50:03 trev GreenJello should i blindly convert all my RwLocks to the parking lot ones?
2021-07-01 15:50:09 pedrocr fivemillion: the rust primitives lead to much different code for use cases like you are describing
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2021-07-01 15:50:40 fivemillion pedrocr, I'm trying to understand how, and what the consequences are
2021-07-01 15:50:52 pedrocr fivemillion: for my image viewer for example I wrap all the image loading into its own thread, that thread has a cache that gives out Arc references and those get passed to other threads through channels
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2021-07-01 15:51:22 pedrocr fivemillion: so it ends up looking more like message passing than shared memory, but in the compiled binary it's all threads and shared memory
2021-07-01 15:52:32 GreenJello trev, probably not blindly
2021-07-01 15:52:44 fivemillion pedrocr, what if I want incremental image loading and display?
2021-07-01 15:53:02 fivemillion that seems to be like a typical "mutate shared memory" use case to me
2021-07-01 15:53:41 pedrocr fivemillion: if you're reading and writing to the same image you're probably going to need double-buffering, so it doesn't seem like shared memory to me
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2021-07-01 15:54:18 fivemillion not sure why I'd waste memory on double buffering
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2021-07-01 15:54:31 fivemillion and probably memcpy
2021-07-01 15:54:39 pedrocr fivemillion: because that's how displaying things on screen works anyway
2021-07-01 15:55:10 fivemillion I know enough about that but I can't say I agree
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2021-07-01 16:37:26 chance curious question from a non-rust programmer. my search-fu is failing. i'm aware that rust "lacks" (more or less) the null pointer (not literally.) i've also seen the existence of None (and Some.) i'm just curious, at the literal, most basic, "this is eventually asm" level, i realize None isn't a pointer to 0x0, but what is it? just a struct that
2021-07-01 16:37:26 chance the language knows means "N/A"? does that mean there can hypothetically be more than one? as you can tell, this has done more (temporary) damage to my psyche than one would expect ;)
2021-07-01 16:38:16 chance the closest i got to an answer was "it's an enum" but that just moves the question a little to one side...
2021-07-01 16:39:17 j`ey chance: it is just an enum!
2021-07-01 16:39:30 j`ey enum Option<T> { None, Some(T) }
2021-07-01 16:39:33 bertptrs but it is. it is an enum. rust enums can contain other values. One state is just None and the other is Some with a value within
2021-07-01 16:39:34 maurer chance: So, it is just an enum *but* there are also fancy representation tricks under the hood
2021-07-01 16:39:35 j`ey you can define your own version
2021-07-01 16:39:43 maurer For example, if you Option<&Foo>
2021-07-01 16:39:54 maurer Rust will figure out that 0 is not a valid bit pattern for &Foo
2021-07-01 16:39:59 maurer and will stick the None arm of Option in there
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2021-07-01 16:41:45 chance so, if i did define my own version, if i understand you guys correctly, it's the type that makes it nullish. so as long as the thing resolves back into a *that*, it's usable as null? i appreciate the answers. i read the fact in passing and it completely took me out of what i was reading!
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2021-07-01 16:42:22 j`ey well it's not nullish on the "language" level
2021-07-01 16:42:25 cehteh chance: rust can optmize things, for option it may use 'niche' values like null pointers under the hood, but it has to prove things are safe and never dereferenced
2021-07-01 16:42:30 la_mettrie isn't None/Some just a pretty normal variable construction in which one variable is simply used to indicate that there is no data in place X and the language is made so that this variable value is always strictly taken into account
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2021-07-01 16:44:08 chance la_mettrie that's the bit that broke me, it sounded to me at first like there needed to be exactly one of this enum, at some particular address, and i couldn't get my head around that being any safer than a pointer to an arbitrary address, seems like it should be the compiler or interpreter's problem to say "don't dereference 0x0." but this
2021-07-01 16:44:08 chance fanciness does help explain it a bit
2021-07-01 16:44:36 j`ey there are many Nones
2021-07-01 16:44:39 j`ey no fixed address
2021-07-01 16:45:21 chance well, no universally fixed address, but surely when the thing is instantiated, something is keeping track? otherwise you'd have to name an instance before you could access the concept of "nothing"
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2021-07-01 16:45:32 Karel chance, Are you coming from Java/Python or something by chance? The big difference with Rust and other C-like languages is that things can be "by value", in Java & co they are (almost always) pointers.
2021-07-01 16:45:56 cehteh note that pointers (no matter what) are not dangerous until you dereference them, then they *must* point to a valid object. rust ensures this at the language level
2021-07-01 16:46:20 Karel So if I say `let a = None` a is not a pointer to some predefined address where the "None" instance lives, it's literally just a value on the stack that represents None.
2021-07-01 16:46:52 j`ey chance: remember that None is not special, since you can define your own Option enum, that the compiler know nothing about
2021-07-01 16:47:03 la_mettrie a bit like a lock isn't it?
2021-07-01 16:47:21 chance I'm coming from a number of places, but Java? God no. the reason it made zero sense to me is that, "bare metal," *everything* is a pointer. "x" is a name for wherever "x" is. (duh)
2021-07-01 16:47:31 cehteh let a = None; is actually illegal becasue it cant infer the type
2021-07-01 16:47:36 chance so it sounded like some lunatic had made the entirely arbitrary decision that the language should not permit stupidity
2021-07-01 16:48:18 Karel Huh things are very much not always a pointer on bare metal? Things are in registers all the time, and None (for eg Option<&T>) can also just fit in a register without it being a pointer.
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2021-07-01 16:49:30 chance at which point it's an identifier for the register. one way or another you're just telling the computer where to get something. the null pointer is *fundamentally* just a universal something. my failed attempts to search for this language feature indicated that programmers can't accidentally try to dereference null, and that's pretty much it.
2021-07-01 16:49:33 cehteh Karel: not always Option<u64> for example has no way to represent None in a niche
2021-07-01 16:50:14 Karel cehteh, yeah I was careful to say it was Option<&T>::None :)
2021-07-01 16:50:18 chance and, fair enough, good feature. just *really* confusing if you're coming from literally anywhere where null is the historical null. certainly every other language does something equally jarring to protect programmers from themselves.
2021-07-01 16:50:41 j`ey chance: in c++ references cant be null either
2021-07-01 16:51:08 cehteh c++ goes only half of the road, you can have dangling references there
2021-07-01 16:51:08 j`ey rust has raw pointers, those can be null
2021-07-01 16:51:15 chance that's true, and part of our job has always been making sure we don't do that =P
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2021-07-01 16:52:25 pedrocr chance: Option<Foo> is like a C struct { guard: bool, pointer: *Foo }, where the language doesn't allow you to access struct.pointer directly and just forces checking the guard first, so it's never possible to dereference the pointer when it's null/undefined
2021-07-01 16:52:44 pedrocr chance: you could do the same in C with functions or macros
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2021-07-01 16:53:26 j`ey pedrocr: it isnt, Option<Foo> stores Foo, not *Foo
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2021-07-01 16:54:08 pedrocr j`ey: sure, just simplifying, the important bit is the guard and syntatic sugar around that
2021-07-01 16:54:44 cehteh actually rust enums are discriminated unions in C
2021-07-01 16:54:56 chance makes perfect sense from a CS perspective. from a language design perspective, i'll get over it
2021-07-01 16:55:02 cehteh but with some smarter optimization opportunities
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2021-07-01 16:55:50 j`ey chance: makes perfect sense from a language design perspective too!
2021-07-01 16:56:04 j`ey chance: Im kinda confused, you *want* nullable references?
2021-07-01 16:57:05 chance i've never seen the fact that "null" is universally defined as a problem, nor as dangerous. i see the careful use of the null pointer as *competence*, and most compilers (and linters) catch most screw-ups. i see the value in what rust has done instead, just, yeah, not a choice i'd have made for my own toolkit
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2021-07-01 16:57:26 chance paradigm shift mostly for your protection against yourself, valid choice, i was happy before *shrug*
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2021-07-01 16:57:54 j`ey if you were going to check all pointers before, Option<&T> just makes sure you do
2021-07-01 16:58:05 j`ey or if you have &T, you dont need to check, it will never be null
2021-07-01 16:58:11 chance either way, i sincerely appreciate the explanation. the simple sentence "rust doesn't have the null pointer" was more effective than my coffee today
2021-07-01 16:58:30 j`ey rust has null raw pointers
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2021-07-01 16:58:42 j`ey rust doesnt have null references
2021-07-01 16:58:45 chance yeah, they exist, they just aren't the idiomatic None, was my point (and ouch)
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2021-07-01 17:00:48 chance to be clear, when i say *the* null pointer, i most definitely mean "memory address nothin' is the idiomatic None," will all it's ever entailed. *not* the concept of *a* null pointer =P
2021-07-01 17:01:06 cehteh note that there is no signle 'None' it still needs a type, that is what makes let a = None; an error in rust (and in this case pointless because its immutable)
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2021-07-01 17:02:00 j`ey chance: the reason I prefer Option, is that it doesnt work with just pointers
2021-07-01 17:02:12 j`ey null only works with pointers, Option can be 'null' for any type
2021-07-01 17:02:21 cehteh let mut a: Option<Something> = None; would be legal (or using the turbofish :))
2021-07-01 17:03:15 cehteh https://turbo.fish/
2021-07-01 17:06:31 pedrocr cehteh: https://play.rust-lang.org/?version=stable&mode=debug&edition=2018&gist=9513f99ae27fc4a7298fd4242d2fa540
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2021-07-01 17:07:09 pedrocr let a = None; works fine, the compiler just needs a way to do the type inference for it
2021-07-01 17:07:11 cehteh yeah in that case it can infer the type because you return it
2021-07-01 17:07:16 cehteh yes
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2021-07-01 17:19:46 daemon if I was going to have a lot of rust processes chatting to each over, over TCP, lots of pretty damn small packets what would be the best serializer to use performance wise
2021-07-01 17:21:21 danieldg bincode, maybe? It really depends on which performance you care about
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2021-07-01 17:21:30 daemon cpu overhead really
2021-07-01 17:21:33 daemon got plenty of ram
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2021-07-01 17:21:38 danieldg and bandwidth?
2021-07-01 17:21:54 daemon bandwidth is not so important either this will all be on the same dedicated server
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2021-07-01 17:22:22 danieldg bincode is pretty fast for cpu but it's bad on data size
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2021-07-01 17:22:42 daemon what would be the next alternative to bincode, thinking a benchmark might be a good idea
2021-07-01 17:22:42 danieldg (because it's intended for localhost comms)
2021-07-01 17:22:53 danieldg something like protobufs, I guess
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2021-07-01 17:23:03 daemon cool protobug vs bincode, thank you :)
2021-07-01 17:23:47 danieldg or adding actual compression to the stream with a fast compressor
2021-07-01 17:24:02 daemon lzo2 was pretty good from memory
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2021-07-01 17:29:36 Tv_ I want to have a HashMap with entries in states Creating, Ready, i want thread #1 to allocate the key by inserting K: Creating, but then do the actual work of transforming Creating to Ready in another thread. MutexGuard is not Send so I can't just ship that over to the worker thread and unlock there. Any thoughts?
2021-07-01 17:30:39 Tv_ HashMap<K, Arc<Mutex<MyEnum>>> and lock again in the worker thread?
2021-07-01 17:32:10 cehteh yes
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2021-07-01 17:32:35 cehteh but do you even need that in a shared hash map? cant you just make that implicit?
2021-07-01 17:33:09 daemon anyone think of a logging module (that is ideally compatible with syslog and windows event log) I can drag in without having to write it my self ^_^
2021-07-01 17:33:10 cehteh looks pointless and a minor performance bottleneck to me
2021-07-01 17:33:14 Tv_ cehteh: unique IDs
2021-07-01 17:33:40 Tv_ cehteh: i mean, the worker thread might not need to touch the map, if all it needs is the entry inside the map
2021-07-01 17:34:28 cehteh then pass the entry to the worker, and when the worker is done with it then it gives it back
2021-07-01 17:34:52 cehteh do you have a single spawner or can any thread spawn work?
2021-07-01 17:35:22 Tv_ cehteh: single spawner
2021-07-01 17:36:08 Tv_ err, actually, one per incoming connection, but there's only ever supposed to be one connection. might need to deal with that, somewhere.
2021-07-01 17:36:10 cehteh then it could be as simple as having a HashSet<BusyId> in the spawner never shared
2021-07-01 17:36:18 Tv_ "supposed to be" ain't visible to the type system ;)
2021-07-01 17:36:43 Tv_ cehteh: i need to reach the Ready state by id later
2021-07-01 17:36:57 cehteh ready for what?
2021-07-01 17:37:07 Tv_ of the Creating vs Ready enum
2021-07-01 17:37:08 cehteh sounds somehow like a condvar or channel?
2021-07-01 17:37:28 cehteh yes but ready for what? ready for doing work?
2021-07-01 17:38:42 Tv_ to make this more concrete (but still simplfied): client says Create()->ID or Increment(ID). creating a new number slot takes say 1 second, so want to push that into a thread.
2021-07-01 17:39:25 Tv_ so main thread loops reading request, for Create allocates ID in state Creating, notifies worker thread
2021-07-01 17:39:40 Tv_ my initial attempt was to Send a MutexGuard to worker thread
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2021-07-01 17:39:52 Tv_ but then rust mutexes are pthreads mutexes so that can't happen
2021-07-01 17:39:57 cehteh i dont get the purpose, creating an ID is already a task/piece of work?
2021-07-01 17:40:08 Tv_ cehteh: it's actually talking to a backend
2021-07-01 17:40:12 cehteh yes you never send mutex guards
2021-07-01 17:40:30 Tv_ in non-pthread land, that would have been doable ;)
2021-07-01 17:40:44 Tv_ but ok so i can send a Mutex, and have the worker re-obtain it
2021-07-01 17:40:50 danieldg Tv_: sounds like you should use a channel?
2021-07-01 17:40:58 cehteh in pthread land its doable too but its arguable a brittle design
2021-07-01 17:41:10 cehteh yeah i am thinking about channels too, or condvars
2021-07-01 17:41:15 Tv_ danieldg: channel will be used to send workers work, but each of these slots has just this one-time transition
2021-07-01 17:41:37 cehteh just play pingpong
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2021-07-01 17:41:51 Tv_ so workers notify main thread of their completion
2021-07-01 17:41:56 cehteh sending messeages around with the state/id as payload
2021-07-01 17:42:12 Tv_ and main thread updates the map
2021-07-01 17:42:15 danieldg Tv_: re-acquire the lock in the worker thread and update the map
2021-07-01 17:42:16 cehteh then you have little to no locking/lock contention
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2021-07-01 17:42:35 danieldg or do all the locking in main, that also works
2021-07-01 17:42:41 cehteh also any shared data even readonly isnt a great idea, only do when you really must do so
2021-07-01 17:42:42 danieldg that'll get you notification too
2021-07-01 17:43:08 cehteh just pass the ball, state machine
2021-07-01 17:43:57 cehteh when your main manager needs to know what balls are in the game then have a hashset there where it marks those, in his own privacy
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2021-07-01 17:58:07 davros https://www.reddit.com/r/rust_gamedev/comments/obj38y/rust_shooter_another_little_update/ read the last few posts about maths library interop, and how it relates to the challenge of Rust matching Unreal Engine.
2021-07-01 17:58:31 davros you need a special caseable workaround for orphan rules to facilitate this IMO.
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2021-07-01 18:44:55 cehteh eww .. Congratulations, you've earned the **New User of the Month award for June 2021**. :trophy: :)
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2021-07-01 22:37:49 cehteh hum .. i want to create a path from 2 components, 1 prefix '/foo/bar' and one user defined thing 'baz/barf.txt' shall give /foo/bar/baz/barf.txt
2021-07-01 22:39:06 cehteh the gotcha: the prefix can be .canonalize()'ed to ensure its absolute and exists, but the user part may not exist already and i need to ensure that it does not escape the prefix (../../)
2021-07-01 22:39:44 cehteh canonalize barfs for non existing things. any idea how to archive that?
2021-07-01 22:41:52 GreenJello cehteh, maybe https://docs.rs/cap-std/0.15.2/cap_std/
2021-07-01 22:43:12 cehteh oh .. lemme check
2021-07-01 22:45:14 cehteh eh what does that more/different than std?
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2021-07-01 22:46:51 GreenJello you'd create a Dir of /foo/bar, and then the methods of Dir will ensure they only operate inside /foo/bar
2021-07-01 22:47:18 GreenJello and you can just work with relative paths instead of needing to join your prefix everywhere
2021-07-01 22:48:02 GreenJello not sure if it's what you need
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2021-07-01 22:48:54 cehteh ah no not really, later on yes, but this itself is a trait which should only work with names
2021-07-01 22:50:10 cehteh i guess i just implement a 'normalize' for pathbuf
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2021-07-01 23:57:44 jbg cehteh: one approach is to remove components from the end of the path until canonicalize() succeeds, then check that the path is within the tree you expect it to be, then put the components back
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2021-07-02 02:31:07 bihtori Is the name of the "Clippy" linter based on the name of the old Microsoft Office assistant?
2021-07-02 02:32:05 Arnavion That's the reference, yes
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2021-07-02 02:33:03 bihtori Wow it took me a couple of years to get that I'm dumb
2021-07-02 02:33:06 death916 why is this convo in 2 channels or am i trippin
2021-07-02 02:33:17 bihtori death916: blame me
2021-07-02 02:33:20 death916 haha
2021-07-02 02:33:25 death916 thought i was seein double
2021-07-02 02:33:57 trev is it also being discussed in the MS Word irc channel?
2021-07-02 02:34:05 death916 does that exist
2021-07-02 02:34:10 death916 is there a ir plugin for word
2021-07-02 02:34:13 death916 cuz that would b cool
2021-07-02 02:34:15 death916 irc*
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2021-07-02 02:44:33 jbg I want an RLS integration for MS Word
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2021-07-02 02:45:17 jbg it's really hard using it as a code editor without any autocomplete
2021-07-02 02:46:07 death916 ur better off using notepad++ than word
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2021-07-02 02:47:18 jbg does notepad++ support formatting? because I like to make my more important functions a larger font size
2021-07-02 02:47:37 trev jbg i once worked with someone who printed code out after pasting it into a word doc. he said he "could read it better on paper"
2021-07-02 02:47:39 jbg and sometimes embed pictures in the comments
2021-07-02 02:47:53 death916 jus like the old days trev
2021-07-02 02:47:53 jbg yeah I have worked with a few people who would print out entire codebases when first getting familiar with them
2021-07-02 02:48:01 jbg get a comfy chair and read through it
2021-07-02 02:48:05 jbg each to their own I guess
2021-07-02 02:48:19 death916 trev r u trev trev
2021-07-02 02:48:20 trev lol oh my...enjoying it like a fine novel
2021-07-02 02:48:29 trev death916 ?
2021-07-02 02:48:44 death916 do u like teams that are loosely base on beer
2021-07-02 02:48:47 jbg I could imagine doing it for something small but dense
2021-07-02 02:51:18 trev death916 i'm not following O_O
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2021-07-02 03:03:43 rk4 pros of word for rust code: you won't have to learn how to write macros in each language, you can use vbscript for all of them
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2021-07-02 03:32:26 bertptrs is there a nicer way to unwrap a Result<T, T> than unwrap_or_else(|e| e)? Seems needlessly clunky
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2021-07-02 03:34:27 alip i want to write a wrapper for eprintln! which prints colour code before and after the string. how can i go about doing this? i think i need a macro right?
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2021-07-02 03:35:28 jbg bertptrs: into_ok_or_err() but it's unstable
2021-07-02 03:36:01 Arnavion Can you change the thing that created the Result<T, T> in the first place to make it not do that?
2021-07-02 03:37:38 Arnavion alip: macro_rules! colored_eprintln! { $($s:expr, $($rest:tt)*) => { eprintln!(concat!("\e[...", $s, "\e[..."), $($rest)*) }; $($s:expr) => { eprintln!(concat!("\e[...", $s, "\e[...")) }; }
2021-07-02 03:38:18 Arnavion Well, \e should be \x0b, but you get the idea
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2021-07-02 03:39:39 alip Arnavion: thank you!
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2021-07-02 03:48:44 bertptrs Arnavion no, because it's slice::binary_search
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2021-07-02 03:59:23 alip 35 | macro_rules! say { $($s:expr, $($rest:tt)*) => { | ^ no rules expected this token in macro call
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2021-07-02 03:59:48 alip Arnavion: it's not happy about the $($s:expr, points at the first parenthesis.
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2021-07-02 04:00:43 Arnavion Oh, that first $ shouldn't be there, in both arms
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2021-07-02 04:03:38 alip thanks
2021-07-02 04:03:51 Arnavion evalr2: macro_rules! colored_print { ($s:expr, $($rest:tt)*) => { print!(concat!("[", $s, "]"), $($rest)*) }; ($s:expr) => { print!(concat!("[", $s, "]")) }; } colored_print!("a{}c", "b"); print!(" "); colored_print!("de ");
2021-07-02 04:03:56 -- Notice(evalr2): Arnavion: [abc] [de ]()
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2021-07-02 04:36:27 fe80 Hi guys, I was just wondering if there is any way to make certain part of my the output of my program invisible to the bash pipes
2021-07-02 04:36:34 fe80 like the password prompt
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2021-07-02 04:36:45 bertptrs Usual method is printing to stderr
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2021-07-02 04:37:08 bertptrs there are more complicated options but this covers most cases
2021-07-02 04:37:08 fe80 Oh could it be that simple? haha
2021-07-02 04:37:10 fe80 thanks
2021-07-02 04:37:33 bertptrs sudo actually grabs the TTY directly but most things don't need that
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2021-07-02 04:38:01 fe80 I just need it for the password prompt
2021-07-02 04:38:18 Arnavion The rpassword crate handles it for you already
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2021-07-02 04:38:42 fe80 i tried it with the prompt function but it pipes the prompt aswell
2021-07-02 04:39:11 fe80 i mean bash pipes it, maybe since it's still stdout
2021-07-02 04:39:16 Arnavion I don't know what you mean by "prompt function", but the function I'm referring to is read_password_from_tty
2021-07-02 04:39:58 fe80 prompt_password_stdout was the function i was refering to
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2021-07-02 04:40:33 fe80 thanks for pinting me to that
2021-07-02 04:40:51 Arnavion The hint of what that function prints the prompt to is kind of in its name, not to mention the one and only line of its documentation :)
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2021-07-02 04:44:49 fe80 i feel silly lol, thanks for the help
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2021-07-02 06:23:32 trev is there a way to group a bunch of imports under one #[cfg(feature = "foo")] ?
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2021-07-02 06:32:07 bihtori trev: You could make a special module with a lot of "pub use"'s, usually called a "prelude", and use it under the attribute.
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2021-07-02 06:39:06 trev bihtori thanks, that will work
2021-07-02 06:43:23 ssbr Does something functionally equivalent to the following proc-macro exist? `counter!(c, Foo{c: x, c: y, c: z})` -> `Foo{0: x, 1: y, 2: z}` -- I wouldn't even know how to find it, to be honest, so hoping someone knows :(
2021-07-02 06:43:53 ssbr right now for my macro-by-example which initializes a tuple, I had to hard-code tuples of length 0-7. Would be nice to just use a counting proc macro that can handle any number.
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2021-07-02 07:24:28 Lumpio- ssbr: Can't you just Foo(x, y, z) which you can do without a procmacro
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2021-07-02 07:25:39 ssbr Lumpio-: in this case, no, because I'm initializing in-place using addr_of_mut!() and the like. I realize this isn't obvious, sorry about the elision
2021-07-02 07:25:59 ssbr let me paste a snippet
2021-07-02 07:30:00 ssbr Lumpio-: not at all self-contained, but includes most of the right stuff: https://bpa.st/JE5A
2021-07-02 07:30:12 ssbr unfortunately under 100 lines is as long as it can get before I require official approvals
2021-07-02 07:30:33 ssbr the painful bit is that bit at the bottom where I literally used a Python script to generate the macro :(
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2021-07-02 07:31:49 ssbr (also noticing some other things I can clean up / fix while I'm here... ah well!)
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2021-07-02 07:43:04 Lumpio- There's a line number limit for showing code? lol
2021-07-02 07:43:08 Lumpio- Sounds like something a paper pusher came up with
2021-07-02 07:45:38 Lumpio- Anyways yeah, then it's proc macro time. Should be reasonable to do with syn/quote
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2021-07-02 07:53:33 ssbr Lumpio-: https://opensource.google/docs/patching/#snippets
2021-07-02 07:53:46 ssbr yeah, I already need a proc macro crate for other things I want to do anyway, so, why not?
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2021-07-02 07:58:13 Trollmann Can somebody please explain in beginner terms why this doesn't do what I expect? Or am I simply missing a call here: https://play.rust-lang.org/?version=stable&mode=debug&edition=2018&gist=f711fc3a1cd25bc85b57e011992b4437
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2021-07-02 08:10:52 necronian I had a match pattern that I needed to change to match a tuple, I have an issue with one of my arms now because or-patterns syntax is experimental
2021-07-02 08:11:01 necronian I fixed a similar arm by using a guard (t, _) if t == '[' || t == ']' but another arm uses ranges like 'A'..='Z' | 'a'..='z' is there a way to match a range in the guard?
2021-07-02 08:11:29 j`ey ('a'..'z').contains(&t)
2021-07-02 08:11:37 j`ey necronian: https://doc.rust-lang.org/std/ops/struct.Range.html#method.contains
2021-07-02 08:11:52 j`ey (but also paste the code, to see if there is a way using match patterns)
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2021-07-02 08:12:22 necronian j`ey: Thank you... I tried something similar like 'a'..'z'.contains(t) but I see my error now
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2021-07-02 08:14:42 j`ey necronian: or maybe: https://play.rust-lang.org/?version=stable&mode=debug&edition=2018&gist=e1dc704e9bd06fb9b2f27413b4114f5e
2021-07-02 08:15:04 necronian j`ey: https://pastebin.com/beJEydsz is the match statement I have devoid of context...
2021-07-02 08:15:28 j`ey ok eyah, see my paste
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2021-07-02 08:15:50 jbg ssbr: so if you need to do more than 100 lines, just put it on stackoverflow
2021-07-02 08:16:01 jbg gotta love arbitrary rules :D
2021-07-02 08:16:27 j`ey jbg: i think you got the precdence wrong
2021-07-02 08:17:06 jbg did I? the only way to parse that heading that leads to something that makes sense is (<= 100 lines of code) or (Stack Overflow)
2021-07-02 08:17:14 jbg since "lines of stack overflow" are not a thing
2021-07-02 08:17:34 j`ey heh
2021-07-02 08:17:55 j`ey Im reading it to mean 100 lines of code, where that means pastebins or stackoverflow
2021-07-02 08:18:19 j`ey just paste all of googles internal secret code to stackoverflow question "what is all of googles secret code?" :P
2021-07-02 08:19:40 jbg ssbr: I feel I should clarify at this point that what I wrote above is Not Legal Advice and I Am Not A Lawyer :D
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2021-07-02 08:22:21 ssbr jbg: I once asked "if it's 101 lines, but I can collapse some whitespace to make it 99 lines, is that okay?" -- they didn't like that. Apparently one should not try too hard to bend the spirit of the rules when interacting with official people. :)
2021-07-02 08:22:47 jbg yeah I guess people don't like reminders that their arbitrary rules are arbitrary
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2021-07-02 08:23:14 jbg of course, if you just said nothing and made it 99 lines, they'd have never known it started as 101
2021-07-02 08:23:39 ssbr jbg: yes, when they called my behavior dishonest, that's exactly what I told them in response. :)
2021-07-02 08:24:20 jbg lol, accused of being dishonest for asking a question
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2021-07-02 08:58:38 Lumpio- >As part of your employment agreement, Google most likely owns intellectual property (IP) you create while at the company. Because Google’s business interests are so wide and varied, this likely applies to any personal project you have.
2021-07-02 08:58:40 Lumpio- wow
2021-07-02 08:58:53 Lumpio- (Ended up reading google open source docs due to link)
2021-07-02 08:59:04 jbg intense eh
2021-07-02 08:59:17 capitol I have a similar crappy one at work
2021-07-02 08:59:34 Lumpio- I wouldn't sign that :-)
2021-07-02 08:59:34 capitol managed to get an exception added for open source things
2021-07-02 08:59:34 j`ey i think most do
2021-07-02 08:59:40 jbg I never worked somewhere where they try to control my out-of-work time or claim title to things I create outside of work
2021-07-02 08:59:42 Lumpio- That's just draconian
2021-07-02 08:59:45 jbg hopefully never will
2021-07-02 08:59:51 Lumpio- Yeah that's completely overreaching
2021-07-02 08:59:57 capitol agree
2021-07-02 09:00:04 capitol but the pay was good :P
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2021-07-02 09:05:44 ssbr It is, for what it's worth, despite even my poor experiences -- it's good stuff, we get to work on challenging and important things, and I wouldn't trade it for anything except owning my own business. I am getting to work on rust / C++ interp stuff full time now, that's pretty rad. :)
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2021-07-02 09:07:21 ssbr (And yeah -- even if there's process etc., we still get to release open source things. I am hoping to open source the docs and crate for this, though obvs no promises.)
2021-07-02 09:08:43 j`ey ssbr: what are you working on, if you can say?
2021-07-02 09:09:43 ssbr j`ey: The main thing I'm doing right now is something similar to https://lib.rs/crates/moveit , except focusing on 1:1 compatibility with C++ -- so you ought to be able to e.g. store and pass around a C++ object the same way C++ could
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2021-07-02 09:10:08 simcop2387 Lumpio-: thanks to california law though, that's actually likely a wrong interpretation. they'd have to show that your personal project was not only in line with their business interests, but also related to what you were being related to your work at the same time, or that you were using company resources to do the project.
2021-07-02 09:10:23 simcop2387 you'd still need a lawyer involved if such a discussion came up though
2021-07-02 09:10:39 ssbr It turns out to be broadly possible. You can store objects on the heap, on the stack, as a temporary, in a struct, in a union -- in an repr(C) enum, though implementing that is annoying -- etc.
2021-07-02 09:10:41 jbg yeah I think it's the classic thing where they word it as broadly as possible to discourage you from pushing it, but in reality there are legal restrictions on that kind of overreach
2021-07-02 09:10:49 capitol ssbr: wow, cool :)
2021-07-02 09:10:54 j`ey ssbr: oh right, youve mentioned that before yeah
2021-07-02 09:10:58 ssbr (but of course you do need to have a handful of traits similar to what moveit defines.)
2021-07-02 09:11:39 ssbr (NB I haven't implemented the repr(C) enum thing. If anyone knows a library that lets me decompose a repr(C) enum into a fieldless enum + union...)
2021-07-02 09:11:42 simcop2387 jbg: yep, thankfully california's 2870-2872 (i think those are the right ones) laws and case law cover it, but you'd still be out a decent amount of $$ to defend it properly
2021-07-02 09:12:01 simcop2387 some other states have similar laws but i don't think nearly the same amount of case law determining it all
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2021-07-02 09:12:45 Lumpio- Yeah but then again in America doesn't the party with the most money win court cases always
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2021-07-02 11:42:29 cehteh jbg: do you know any crate that does that already? and seems to be somewhat expensive
2021-07-02 11:42:58 jbg I can't imagine it's very expensive unless you are _extremely_ constrained
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2021-07-02 11:43:51 cehteh i am not, just feels a bit out of place to do that this way, ideally one does it the other way around
2021-07-02 11:43:53 jbg a path is just a bunch of bytes and the path separator is a known byte value
2021-07-02 11:43:59 jbg slicing and dicing paths is not even remotely expensive
2021-07-02 11:44:20 cehteh yeahm but the stat calls walking the path are, esp on remote filesystems
2021-07-02 11:44:48 jbg yeah, that is true, it would add up if the path was very deep
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2021-07-02 11:45:24 cehteh in one of my uberallfs apis i have another aproach returning a (path_found, leftovercomponets) tuple
2021-07-02 11:45:53 cehteh that wals the path left to right
2021-07-02 11:46:14 cehteh to bad that there is no such thing in the stdlib
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2021-07-02 11:46:59 cehteh but i may just implement that this way
2021-07-02 11:47:17 jbg I guess one concern is that canonicalising a path that does not exist is a bit fraught with danger
2021-07-02 11:47:46 cehteh yes but somtimes its exactly what you need
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2021-07-02 11:48:14 jbg sure but if you go ok, /foo/bar exists and someone asked for /foo/bar/baz/boo so I'm happy because it's within the tree I want it to be within
2021-07-02 11:48:21 jbg but /foo/bar/baz doesn't exist
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2021-07-02 11:48:32 jbg and then someone makes a symlink /foo/bar/baz -> /sys
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2021-07-02 11:49:40 cehteh actually i have there the question/assertion "is the path the user supplies within the test dir" and further then "does that exist already" or "is it available"
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2021-07-02 11:50:52 jbg yeah but you can't determine whether it's in the test dir unless it already exists
2021-07-02 11:51:01 cehteh you can always shoot in your feet, and its not the libs responsibility to do access control, but it should be able to answer some things voluntary
2021-07-02 11:51:04 jbg unless you exclude symlinks
2021-07-02 11:51:52 jbg because an intermediate component of the path could be created as a symlink between you "semi-canonicalising" and you working with the final path
2021-07-02 11:52:41 jbg I assume footguns like this are (part of) the reason std doesn't provide a "canonicalise as if the path existed" function
2021-07-02 11:52:51 cehteh thats not really a problem here, if somone creates a symlink to the outside its prolly intentional, but if someone creates a file in testdir/../../foo it may be a mishap
2021-07-02 11:53:12 jbg if you only want to handle '..' and '.' then you can write that without any need to do stat() of course
2021-07-02 11:54:05 cehteh yes, thats the simple approach i am tihnking now: iterate over path components, panic on .. and remove .
2021-07-02 11:54:17 cehteh or maybe resolve .. (pop the last)
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2021-07-02 11:55:06 cehteh i prolly do this as is .. its simple and good enough, and its only a voluntary protection against footguns, no security check
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2021-07-02 13:34:24 meltyness Is there a canonical way to do set-equality comparison?
2021-07-02 13:35:56 j`ey what's set-equality?
2021-07-02 13:36:25 j`ey there's a HashSet, which is a set data structure
2021-07-02 13:36:40 meltyness a collection is equal provided for every x in A, there exists x in B, and vice-versa.
2021-07-02 13:37:36 j`ey HashSet has a bunch of methods that would help, but not for generic collections
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2021-07-02 13:47:16 meltyness .any() might be elegant enough
2021-07-02 13:47:22 cehteh might be helful to use a BTreeSet in that case, using iterators to compare both sets
2021-07-02 13:47:53 cehteh do you need exact equality or can one set have more elements?
2021-07-02 13:50:07 meltyness The sets to be compared will only have 2 elements, guaranteed.
2021-07-02 13:50:18 cehteh how many sets do you have exactly 2, only a few, or dynamic?
2021-07-02 13:50:34 meltyness 3 benchmarks, and an input to be compared
2021-07-02 13:50:52 j`ey wait, they only have 2 elements in them?
2021-07-02 13:51:30 meltyness It's a very simple example I'm working through in this case
2021-07-02 13:51:52 meltyness https://play.rust-lang.org/?version=stable&mode=debug&edition=2018&gist=9e328ba0b9d89d987732e94a81890239
2021-07-02 13:51:57 cehteh i ma just thinking about struct PresentIn {a: bool, b: bool, ....} (or some bitmap whatever floats the boat) and then HashMap<Key, PresentIn>
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2021-07-02 13:53:04 cehteh if you want to performance optimize to the teeth, but prolly its better in that case to write more verbose slightly slower code only using std facilities rather inventing something on your own
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2021-07-02 13:53:55 j`ey meltyness: i dont see what this has to do with sets?
2021-07-02 13:55:02 cehteh if PresentIn is just a u64 or so and you set/clear bits, remove the entry when the value becomes 0 it could be very efficient in space and cycles
2021-07-02 13:55:08 meltyness Both the input to mix() and the structures determining which secondary color are elegantly similar to mathematical sets.
2021-07-02 13:55:12 cehteh but premature optimization ;)
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2021-07-02 13:56:22 meltyness So the problem with a HashMap would be how to ensure that it's established before runtime
2021-07-02 13:56:22 cehteh otherwise if its not performance critical i often prefer BTree* things because sometimes later one finds a way to do things that benefit from ordering
2021-07-02 13:56:37 meltyness function runtime, I mean'
2021-07-02 13:56:45 cehteh huh?
2021-07-02 13:57:29 cehteh well you have to wrap it somehow behind an api and then maybe lazy_static is your friend .. not sure what you exactly mean thouh
2021-07-02 13:57:40 meltyness So there are three choices of the set -- yeah stackoverflow pointed to lazy_static
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2021-07-02 13:58:46 j`ey im confused now
2021-07-02 13:58:50 j`ey whats the hashmap for?
2021-07-02 13:59:05 j`ey for mapping (prim_colour, prim_colour) -> secondary_colour ?
2021-07-02 13:59:06 cehteh same here, but maybe less than you :)
2021-07-02 14:00:54 meltyness hashset -- not hashmap
2021-07-02 14:01:08 j`ey meltyness: can you write some example uses of this mix function?
2021-07-02 14:01:18 j`ey i dont understand how the set comes into play
2021-07-02 14:02:09 j`ey if you really only have PrimaryColor having 3 different values, you could just list all the combinations with a match
2021-07-02 14:02:54 meltyness The cominations aren't inherently two-sided, you'd end up writing code for the case of purple where, c1 can be red -- or c2 could have been red, and the other blue.
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2021-07-02 14:03:25 j`ey well you could always sort the input
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2021-07-02 14:03:57 j`ey but even so, if this is your actual use case, i'd just write it all out
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2021-07-02 14:05:54 meltyness :D I got it!
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2021-07-02 14:07:28 j`ey (I also dont see how this relates to sets anyway, since it actually sounds like you wanted to have a mapping..)
2021-07-02 14:08:39 meltyness So i used iter().any() to avoid having to deal with handed-ness
2021-07-02 14:09:10 j`ey can you paste the code?
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2021-07-02 14:09:31 meltyness https://play.rust-lang.org/?version=stable&mode=debug&edition=2018&gist=d061f039a759e78538fc876f95d59bfb
2021-07-02 14:09:47 j`ey hm
2021-07-02 14:10:53 cehteh looks somewhat ugly
2021-07-02 14:11:32 meltyness It may be the best you can do with the way the types are being defined
2021-07-02 14:11:43 j`ey meltyness: this doesnt work
2021-07-02 14:11:49 cehteh are the colors are simple enum?
2021-07-02 14:11:53 j`ey meltyness: what about mix(red, red)
2021-07-02 14:11:55 cehteh non structured?
2021-07-02 14:12:00 j`ey that returns Green
2021-07-02 14:12:11 j`ey oh nvm
2021-07-02 14:12:12 meltyness There's a panic, up top j`ey
2021-07-02 14:12:14 j`ey they have to be diff
2021-07-02 14:12:15 j`ey yeah
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2021-07-02 14:12:33 meltyness cehteh -- yes they are three element enums, deriving PartialEq
2021-07-02 14:12:56 meltyness I don't see a pretty way to do it with map either, since that doesn't solve the LHR/RHS problem
2021-07-02 14:12:58 j`ey meltyness: https://play.rust-lang.org/?version=stable&mode=debug&edition=2018&gist=342a61a1c9c54db46e1847249bbdcc5e
2021-07-02 14:14:12 meltyness oh with pattern matching
2021-07-02 14:14:27 j`ey yes
2021-07-02 14:17:31 Arnavion It would less effort to just write (Red, Blue) | (Blue, Red) => Purple, (Red, Yellow) | (Yellow, Red) => Orange,
2021-07-02 14:17:42 j`ey yeah
2021-07-02 14:17:43 cehteh https://play.rust-lang.org/?version=stable&mode=debug&edition=2018&gist=d061f039a759e78538fc876f95d59bfb
2021-07-02 14:17:59 j`ey cehteh: reclick share
2021-07-02 14:18:24 cehteh https://play.rust-lang.org/?version=stable&mode=debug&edition=2018&gist=32fa0d4255fa535bf1e45d55d99db483
2021-07-02 14:18:32 cehteh lol but pretty much the same than yours :)
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2021-07-02 14:19:09 cehteh ah i hate the playgorund sharing
2021-07-02 14:19:47 cehteh now i lost my edits
2021-07-02 14:20:02 Arnavion But anyway, if you really want to rice it, make a u8, do a loop over [c1, c2] with three tests to set 0x1 / 0x2 / 0x4 in it, and match on the u8
2021-07-02 14:20:15 cehteh well i sorted c1/c2 first in a tuple and then match on that tuple
2021-07-02 14:20:43 Arnavion As a bonus that also contains the c1 == c2 check (for when the u8 is 0x1 / 0x2 / 0x4) so you don't need to do it separately
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2021-07-02 14:23:02 Arnavion ie https://play.rust-lang.org/?version=stable&mode=debug&edition=2018&gist=22d12c04614a830aa475662cbd254eaf
2021-07-02 14:23:18 Arnavion (I don't suggest you actually do this)
2021-07-02 14:24:11 cehteh hehe i did some bitstuffing tricks for encoding a identifier type
2021-07-02 14:24:53 Arnavion Too bad you can't just do mix |= 0x1 << std::mem::discriminant(&c);
2021-07-02 14:25:25 cehteh https://github.com/cehteh/uberallfs/blob/master/objectstore/src/identifier_kind.rs << you can call that ugly too
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2021-07-02 14:26:40 andi_ is it offtopic to ask if anybody does have experience with incredibuild on either C but prefered on rust?
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2021-07-02 14:48:28 meltyness cehteh, j`ey that's like 4 times faster :[
2021-07-02 14:48:54 j`ey it's way more direct
2021-07-02 14:49:19 meltyness test tests::bench_iter_mix ... bench: 2,264 ns/iter (+/- 127)
2021-07-02 14:49:20 meltyness test tests::bench_match_mix ... bench: 504 ns/iter (+/- 15)
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2021-07-02 14:51:08 cehteh https://play.rust-lang.org/?version=stable&mode=debug&edition=2018&gist=b0dae7cb85b61936547a520357438793
2021-07-02 14:51:29 cehteh the path normalize, simple, should be good for now
2021-07-02 14:51:43 cehteh no idea how i handle this windows prefix handling
2021-07-02 14:51:52 cehteh (put aside and prefix later?)
2021-07-02 14:52:31 cehteh the types could been better/more generic but i dont need more at the moment
2021-07-02 14:52:40 dcz_ I want to build std::core using stable rust - am I on the right track looking into x.py?
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2021-07-02 14:52:59 meltyness @Arnavion running 3 tests
2021-07-02 14:53:00 meltyness test tests::bench_iter_mix ... bench: 2,263 ns/iter (+/- 130)
2021-07-02 14:53:00 meltyness test tests::bench_match_mix ... bench: 507 ns/iter (+/- 60)
2021-07-02 14:53:01 meltyness test tests::bench_match_u8 ... bench: 508 ns/iter (+/- 20)
2021-07-02 14:53:27 cehteh meltyness: too bad i lost my solution in the playgrund pasting crap
2021-07-02 14:53:36 cehteh whats your code now?
2021-07-02 14:56:29 meltyness all better x}
2021-07-02 14:56:30 cehteh meltyness: https://play.rust-lang.org/?version=stable&mode=debug&edition=2018&gist=aaa77e664c995248741bf64edec5d84d
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2021-07-02 14:57:13 cehteh needs more cases wriitten out and a final _ => error case
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2021-07-02 15:00:33 meltyness yeah I managed to hack it together
2021-07-02 15:01:03 meltyness needed to impl PartialOrd too, stands up with the other match-based implementations over the iter() based one I landed on
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2021-07-02 15:03:22 cehteh mmh i'd with sometimes that rust had a trait Foo for Bar {...}, stating that one wants to extend only Bar nothing else
2021-07-02 15:05:51 cehteh actually Foo is even pointless
2021-07-02 15:06:17 cehteh extend Bar {}
2021-07-02 15:08:21 j`ey cehteh: https://rust-lang.github.io/api-guidelines/future-proofing.html might help?
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2021-07-02 15:09:10 cehteh j`ey: my intention was more something pleasant to the eye
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2021-07-02 15:09:46 cehteh not adding more code
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2021-07-02 15:10:34 j`ey heh
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2021-07-02 15:22:33 cehteh and meh .. why doesnt PathBug::push() take a Component or at least have a ::push_component() would be more orthogonal
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2021-07-02 15:33:12 -- xse__ is now known as xse
2021-07-02 15:36:07 parazyd What is this syntax/functionality called in Rust?: foo(|| "some string", |mut bar| { do_something(|| "another string", baz, || something() })
2021-07-02 15:36:20 parazyd Specifically the foo(|| ...) and |mut bar|
2021-07-02 15:37:14 meltyness closures
2021-07-02 15:37:42 GreenJello between the ||s is the argument list
2021-07-02 15:38:20 GreenJello between the |s, I mean
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2021-07-02 15:42:16 parazyd ah thanks
2021-07-02 15:42:21 parazyd Been looking for the doc
2021-07-02 15:42:55 danieldg the Fn trait (and others) have docs for them
2021-07-02 15:43:12 parazyd Yeah
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2021-07-02 16:40:15 bertptrs cehteh: PathBuf::push takes AsRef<Path>, which Component implements
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2021-07-02 16:42:41 cehteh bertptrs: oh ok makes things simpler
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2021-07-02 16:46:22 * dcz_ just cross-compiled libcore using a stable compiler :) risc-v here I come
2021-07-02 16:47:00 dcz_ if only I knew about RUSTC_BOOTSTRAP two months ago, I'd have managed then
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2021-07-02 16:53:04 cehteh normalized = normalized.canonicalize().unwrap_or(normalized); <<< feels a bit redneck :D
2021-07-02 16:53:27 cehteh total normalized!
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2021-07-02 17:11:15 meltyness cehteh: https://github.com/meltyness/art_benchmarks
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2021-07-02 17:12:05 j`ey you should use black_box with the arguments to the mix() call
2021-07-02 17:12:32 cehteh meltyness: results?
2021-07-02 17:12:54 cehteh wondering if tuple vs array makes a difference
2021-07-02 17:13:04 meltyness not perceptably no
2021-07-02 17:13:22 meltyness I think you built it as tuple and I fooled with array to see if it was any different
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2021-07-02 17:13:38 cehteh i men yes i expect it to be exactly the same
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2021-07-02 17:13:51 cehteh anyway can you pastbin the results
2021-07-02 17:14:44 cehteh i'd prefer tuples because of expressiviness
2021-07-02 17:15:04 meltyness https://gist.github.com/1b9d0e9f56d668acee596a4e5eecf8b6
2021-07-02 17:15:21 cehteh at least my code wins by lest lines :D
2021-07-02 17:16:03 meltyness One thing I considered for yours was to establish [Red,Blue] as a Const
2021-07-02 17:16:07 cehteh speed is pretty much the same
2021-07-02 17:16:27 meltyness yours is a little fragile though, changing "[Yellow, Blue]" to "[Blue, Yellow]" can cause a panic in unexpected situations
2021-07-02 17:16:32 cehteh thats optimmized by the compiler
2021-07-02 17:16:50 cehteh huh?
2021-07-02 17:16:58 cehteh you give the rules about ordering
2021-07-02 17:17:12 meltyness I just used the defaults established invisibly by PartialCmp
2021-07-02 17:17:17 cehteh you can also write out any other combination and leave out the sort step
2021-07-02 17:17:36 meltyness hehe
2021-07-02 17:18:25 cehteh [Yellow, Blue] | [Blue, Yellow] => Green,
2021-07-02 17:18:29 j`ey meltyness: as I expected, adding black_box() around the arguments to mix() changes things a lot
2021-07-02 17:19:50 meltyness what do you mean?
2021-07-02 17:20:34 j`ey mix(black_box(Red), black_box(Blue))
2021-07-02 17:20:36 j`ey etc
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2021-07-02 17:22:24 cehteh meltyness: how do i run those benches? cargo bench --toolchain?
2021-07-02 17:22:42 meltyness rustup toolchain default nightly
2021-07-02 17:22:44 meltyness cargo bench
2021-07-02 17:22:58 j`ey or cargo +nightly bench
2021-07-02 17:23:10 cehteh ah that was it, dont want to default to nightly
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2021-07-02 17:23:51 cehteh https://gist.github.com/rust-play/1b9d0e9f56d668acee596a4e5eecf8b6
2021-07-02 17:24:10 cehteh haha there you see, sometiems throwing a faster hardware on the problem helps :D
2021-07-02 17:24:16 meltyness that's weird
2021-07-02 17:24:29 j`ey cehteh: yeah but the results dont mean much
2021-07-02 17:24:34 meltyness when I threw blackbox around all the arguments, my code's faster :x
2021-07-02 17:24:35 cehteh yes
2021-07-02 17:24:45 j`ey meltyness: yes, its just being optimised out
2021-07-02 17:24:53 j`ey without the blackbox
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2021-07-02 17:27:36 meltyness so the match-code everyone else wrote can be optimized out for known parameters, but mine cant?
2021-07-02 17:28:26 tsdh Is there some crate which allows searching the XDG desktop database for the .desktop file by the application id and offers access to its contents, e.g., the app icon?
2021-07-02 17:28:29 j`ey meltyness: yeah
2021-07-02 17:29:35 Swahili Q: Going through basics. DateTime<Utc> and Duration are different types, but I'm allowed to sum/add them. Why does it work?
2021-07-02 17:29:54 j`ey Swahili: because someone wrote an impl Add for DateTime and Duration
2021-07-02 17:30:10 * tsdh only found the desktopentries crate which is a binary with no lib.
2021-07-02 17:30:18 j`ey Swahili: for example adding String + &str https://doc.rust-lang.org/std/string/struct.String.html#impl-Add%3C%26%27_%20str%3E
2021-07-02 17:30:32 danieldg tsdh: I didn't find one, but would have use for it if it existed
2021-07-02 17:31:07 danieldg right now I'm just punting and assuming icon = appid because it's mostly true :)
2021-07-02 17:32:04 Swahili j`ey: thanks for replying back! Just noticed that almost all the solutions in exercism do the same, so wondering if this is the only way to do it as I didn't find this solution while going through the create doc for chrono
2021-07-02 17:32:07 Swahili https://paste.sh/V41dwXcw#_jE7wYt7XpeV9FtQOZFOuPw9
2021-07-02 17:32:33 Swahili https://exercism.io/tracks/rust/exercises/gigasecond/solutions?order=published_at_desc
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2021-07-02 17:32:56 j`ey Swahili: https://docs.rs/chrono/0.4.19/chrono/struct.DateTime.html#impl-Add%3CDuration%3E
2021-07-02 17:33:17 codepilot hi everybody!
2021-07-02 17:34:01 cehteh meltyness: now we get numbers:
2021-07-02 17:34:03 cehteh test tests::tests::bench_match_cmp ... bench: 2,057,548 ns/iter (+/- 32,441)
2021-07-02 17:34:03 cehteh test tests::tests::bench_match_cmp2 ... bench: 1,428,491 ns/iter (+/- 19,717)
2021-07-02 17:34:44 cehteh the 2nd one is with the sorting removed, using tuples and written the alternatives out (Red,Blue) | (Blue,Red) =>
2021-07-02 17:35:26 codepilot I have the following issue: Can I make a macro that accepts something like my_macro!['A' => 'Z', '_', '0' => '9'] ? I tried to do it with macro_rules! but I only get a version to work with $from:expr => $to:expr, but not with mixed parameters.
2021-07-02 17:35:35 j`ey cehteh: are you using black_box around all the params now?
2021-07-02 17:35:42 cehteh yes
2021-07-02 17:36:39 cehteh https://gist.github.com/rust-play/1b9d0e9f56d668acee596a4e5eecf8b6
2021-07-02 17:36:51 cehteh se comment .. I win \o/
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2021-07-02 17:39:05 Swahili j`ey: could I use `add` as a method instead of the + operator?
2021-07-02 17:39:29 codepilot here is a playground link to my problem with the macro https://play.rust-lang.org/?version=stable&mode=debug&edition=2018&gist=a46711c7d42f0080d455bc982fc3479a
2021-07-02 17:39:35 danieldg Swahili: you'd need to 'use' the trait first, but yes
2021-07-02 17:40:09 tsdh danieldg: Yeah, mostly. My firefox has the app_id firefoxdeveloperedition but desktop file and icon are named firefox-developer-edition...
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2021-07-02 17:41:07 Swahili I'm going through the book and doing exercises as I find it easier to learn this way. Would you mind share how that'd look like danieldg?
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2021-07-02 17:41:57 danieldg tsdh: --name can override it back on firefox anyway
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2021-07-02 17:42:19 danieldg Swahili: use std::ops::Add;
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2021-07-02 17:42:42 danieldg Swahili: you must 'use' a trait like that to be able to call functions on it using .
2021-07-02 17:43:49 Swahili danieldg: interesting! thank you very much! that worked https://paste.sh/PTWzT9VT#JuBZWxwU1wsIpS5DRlW4Eiff
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2021-07-02 17:44:45 Swahili I don't know why everyone came up with the same solution in exercism, but if they are also beginners just by looking at the doc not sure how they found the same conclusion its not very evident in my opinion. Now, by `use std::ops::Add`
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2021-07-02 17:45:11 Swahili makes more sense and cleared the path to understanding why the other solution works from my pov
2021-07-02 17:45:34 j`ey Swahili: why does .add() make more sense than +?
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2021-07-02 17:46:03 Dizidentu so I had a dream
2021-07-02 17:46:08 Swahili j`ey: from a perspective of just looking at the documentation, as a beginner. The doc mentions the impl trait as a method called add
2021-07-02 17:46:13 Dizidentu I was coding a query-based animation system for an engine
2021-07-02 17:46:17 Dizidentu not sure which engine as of yet
2021-07-02 17:46:22 meltyness most commonly-known languages have really sloppy type compatibility, see: excel
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2021-07-02 17:46:36 j`ey Swahili: I see
2021-07-02 17:46:51 Dizidentu a system where you can query bone rotation, vertices etc from a pooled data structure
2021-07-02 17:47:16 Dizidentu so the data isnt attached to lets say CBone class
2021-07-02 17:47:25 Swahili j`ey: I'd like to make sure that when I look at the doc, I can come up with my own solutions. So, I might be absolutely wrong and its evident to everyone else but me, but in exercism all the solutions are exactly the same, I end up concluding that they might have copy each other.
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2021-07-02 17:47:37 Dizidentu its in a pool, and you use QBone class to determine which bone you are querying
2021-07-02 17:47:49 Swahili but now that danieldg shared `use std::ops::Add`, it made a lot of sense
2021-07-02 17:47:53 j`ey Swahili: your solution is the same too!
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2021-07-02 17:47:59 cehteh meltyness: i pasted the code into my comment .. have fun with that
2021-07-02 17:48:01 Swahili j`ey: yes same solution
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2021-07-02 17:48:40 Swahili j`ey: is there other ways of solving it?
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2021-07-02 17:49:03 meltyness cehteh: zErO-cOsT aBsTrAcTiOnZ
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2021-07-02 17:49:11 Swahili j`ey: initially I thought I could offset the datetime, but couldn't find out how
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2021-07-02 17:49:35 j`ey Swahili: dunno, but this looks "obvious" enough
2021-07-02 17:49:48 Swahili j`ey: you're right!
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2021-07-02 17:51:10 Swahili The reason why Rust allowed me to .add in a DateTime, is because DateTime implements the trait Add. Otherwise this wouldn't work. So trait is similar to an interface in other languages, yah?
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2021-07-02 17:51:22 j`ey yeah
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2021-07-02 17:52:20 cehteh meltyness: i have an idea how to do it even faster :D
2021-07-02 17:52:29 cehteh hold my beer ...
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2021-07-02 17:58:01 meltyness It looks like my iter solution isn't totally off the mark though, at least not on my machine
2021-07-02 17:58:44 j`ey I prefer the other solutions for readability
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2021-07-02 17:59:17 meltyness Incorporating match is good, and I learned that you can use | for pattern matching
2021-07-02 18:01:48 cehteh test tests::tests::bench_match_cmp2 ... bench: 1,450,595 ns/iter (+/- 247,401)
2021-07-02 18:01:48 cehteh test tests::tests::bench_match_cmp3 ... bench: 1,283,054 ns/iter (+/- 8,777)
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2021-07-02 18:02:02 meltyness !!!
2021-07-02 18:03:29 cehteh oops bug ... moment
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2021-07-02 18:07:24 cehteh ah ok not going faster :/
2021-07-02 18:08:33 j`ey cehteh: show what you tried!
2021-07-02 18:09:08 cehteh make it repr(u8) and then match c1 | c2 <<4
2021-07-02 18:09:21 cehteh as u8
2021-07-02 18:09:34 j`ey heh
2021-07-02 18:09:49 cehteh something i've done on microcontrollers in C switch statements to have poor man tuples
2021-07-02 18:10:53 cehteh https://gist.github.com/cehteh/3c44f46f088f7723816ce98f8af53362 << noted that down for someone esle
2021-07-02 18:11:19 cehteh could be even more optimized, but thats for educational use
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2021-07-02 18:25:03 meltyness Learning rust in two weeks is pretty good right? I'm gonna make a pot of coffee and finish the last few chapters tonight!
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2021-07-02 18:25:30 meltyness Thanks for your help and inspiration j`ey, cehteh,
2021-07-02 18:25:33 cehteh i am rather try to learn it since half a year
2021-07-02 18:25:55 meltyness I just mean the basics as captured by TRPL
2021-07-02 18:25:58 cehteh https://gist.github.com/cehteh/ea7d74231087776a290e02b8f071ccc3 btw the normalize as it is now, performance wise not perfect, but should work
2021-07-02 18:27:46 cehteh could be more generic taking anything that could be a path and return mhm Path? unsized, any better way to return a non dynamic result which can be cheaply turned into a PathBuf if required?
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2021-07-02 18:37:41 Guest76 hey guys just wanted to let u know that rust is the s**t
2021-07-02 18:38:34 la_mettrie meaning good or bad?
2021-07-02 18:38:45 Guest76 amazing
2021-07-02 18:38:47 j`ey good
2021-07-02 18:38:54 meltyness "the s**t" usually means good
2021-07-02 18:39:05 cehteh orly? :)
2021-07-02 18:39:16 j`ey shit = bad, the shit = good
2021-07-02 18:39:31 Guest76 lol exactly
2021-07-02 18:39:44 meltyness guest76 if you think rust is cool you should check out LISP
2021-07-02 18:40:19 cehteh https://paste.debian.net/1203192/ << i had to check :D
2021-07-02 18:40:38 Guest76 studying the book right now havent been able to do anything else just rust thats how great i think it is
2021-07-02 18:41:00 meltyness me too... what chapter are you on Guest76?
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2021-07-02 18:41:23 Guest76 12
2021-07-02 18:41:33 meltyness oh dang we're close as heck
2021-07-02 18:41:38 meltyness i just started chapter 14
2021-07-02 18:41:49 Guest76 oooh cool
2021-07-02 18:41:51 meltyness 15
2021-07-02 18:44:18 Guest76 i was a python user not expert of course but the speed subject always bother me about it but rust syntax at least for me is way easier than c, c++ so solved both issues for me
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2021-07-02 18:47:03 meltyness Somewhat related, I started using "TextMarker" and established some conventions for highlighting stuff -- Green "I get this." Gold "This is a new concept" Yellow "This is tricky"
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2021-07-02 18:47:19 meltyness and now when I read other stuff, I find myself assessing these things -- even without the extension
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2021-07-02 18:48:00 meltyness Like some sort of biofeedback, super cool
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2021-07-02 18:49:11 davros meltyness LISP is elegant in many ways but can't handle the range of niches rust can
2021-07-02 18:50:03 davros cool lisp featurs in rust: expression based syntax, (good) lambda functions, AST macro system (not as powerful as lisp's but better than C's)
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2021-07-02 18:54:57 meltyness When I was getting educated, LISP was an interesting aside, because the whole focus had been on OOP and imperative HLLs
2021-07-02 18:55:29 meltyness alas, my degree was focused less on the beauty of computation and analysis therein, but practicalities of computing
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2021-07-02 18:56:52 quechon ok peeps cool to be part of this community i will be here ofter bothering u guys lol
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2021-07-02 19:14:48 jeaye meltyness: Gold and yellow are very similar.
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2021-07-02 19:15:43 meltyness It's more orange really, but with more yellow than a linear approximation would end up producing, i think.
2021-07-02 19:19:54 ashafq Is it normal for Rust struct to be together with their impl? Or do you guys groups your structs together than all the impls together?
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2021-07-02 19:23:46 cehteh when a file contains too many structs/impls i rather put those in own files, for some smaller things and helper structs its ok to be clobbered together, but anything providing isolated functionality gets its own file, at least after some refactoring run
2021-07-02 19:24:08 cehteh (just now i notice i put too much stuff in a single file)
2021-07-02 19:25:16 GreenJello for me it's mostly a judgement call of whether someone needs to see the struct/enum declarations when they first visit the file for the next part of the file to make sense
2021-07-02 19:25:25 cehteh hum actually its traits .. but comes down to the same thing
2021-07-02 19:25:45 GreenJello and sometimes I'll put trait impls at the bottom or in a separate module if they're uninteresting
2021-07-02 19:25:50 cehteh yeah, but usually its the case that you want to see that together
2021-07-02 19:26:06 cehteh unless you have some data-hefty things maybe serde
2021-07-02 19:31:58 bwidawsk What's the best way to have cargo run certain tests only under certain conditions? Ideally it can autodetect based on the presence of a certain file, but if I have to pass a flag to cargo test, that's fine also. using name filtering is the best I can seem to find
2021-07-02 19:32:37 cehteh you can use feature flags for that or other config options
2021-07-02 19:34:35 bwidawsk cehteh: what's an example of "other config options"?
2021-07-02 19:34:59 bwidawsk also, can I do the same for doc tests?
2021-07-02 19:35:00 cehteh --config <KEY=VALUE>... Override a configuration value (unstable)
2021-07-02 19:35:42 cehteh iirc doctests are in no way special except that they are extracted from the documentation
2021-07-02 19:36:16 bwidawsk oh cool, didn't bother checking until now that doc does allow features also... thanks
2021-07-02 19:36:38 cehteh well not 100% sure in every detail, just give it a try
2021-07-02 19:37:11 bwidawsk for the tests, that seems right
2021-07-02 19:37:12 cehteh building a library or a executable?
2021-07-02 19:37:18 bwidawsk I have both
2021-07-02 19:37:55 * cehteh just working on a test framework for executables
2021-07-02 19:37:59 bwidawsk good description on how to use features in a workspace
2021-07-02 19:38:01 bwidawsk https://stackoverflow.com/questions/48583049/run-additional-tests-by-using-a-feature-flag-to-cargo-test
2021-07-02 19:38:36 bwidawsk cehteh: what does it do above and beyond cargo's runner?
2021-07-02 19:40:19 cehteh calling cargo build to build the executables at test time (usually thats not a dependency) provide a way to launch them and what i am working on now, a lot helpers for tests, creating test directories, populating them, validating their content
2021-07-02 19:40:49 cehteh and of course you can also use the programs stdio itself, regex captures etc
2021-07-02 19:41:23 cehteh https://docs.rs/testcall/0.2.0/testcall/
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2021-07-02 19:45:19 bwidawsk the feature flag isn't seeming to work with doc examples
2021-07-02 19:45:25 bwidawsk but maybe I did something wrong
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2021-07-02 19:49:55 bwidawsk cehteh: you were just thinking this, right?
2021-07-02 19:49:57 bwidawsk -/// ```no_run
2021-07-02 19:49:59 bwidawsk +/// ```
2021-07-02 19:50:01 bwidawsk +/// #[cfg_attr(not(feature = "cxlhost"), ignore)]
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2021-07-02 19:51:03 cehteh yes
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2021-07-02 19:51:36 cehteh // #[cfg(feature = "cxlhost")] ?
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2021-07-02 19:53:06 bwidawsk cehteh: that appears to work
2021-07-02 19:53:12 cehteh :)
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2021-07-02 19:55:26 bwidawsk cehteh: thanks
2021-07-02 19:55:53 cehteh wlel .. i just guessed, but we had this a few days ago here
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2021-07-02 20:20:55 cehteh meltyness: zero cost abstactions in rust means that the abstraction costs (close to) zero, but it cant make the actual computation zero cost
2021-07-02 20:21:50 cehteh (or if it can do that its rather some other kind of optimization, const folding etc)
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2021-07-02 20:23:17 meltyness right, the problem though, and what i expect from functional languages would be for cmp to be exactly cmp2 performance-wise
2021-07-02 20:23:32 meltyness It's good that it's only a 5-10% margin
2021-07-02 20:24:29 meltyness It's at least a curiosity
2021-07-02 20:24:39 cehteh yes its somehow interesting, the compiler could optimize that
2021-07-02 20:24:52 meltyness But yeah, I get that there's a performance difference between what would be compiled down to branching versus const comparisons
2021-07-02 20:25:11 cehteh i havent checked the actual asm generated
2021-07-02 20:25:56 cehteh but cmp2 is pretty abstract and reads almost like a cooking receipe when you mix red with blue or blue with red then you get purple
2021-07-02 20:26:26 meltyness Notationally it's nice, but having to deal with the "handedness" was exactly what I was hoping to find a good way to avoid
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2021-07-02 20:26:39 cehteh maybe its possible to remove this ordering constraint havent thought abut that yet
2021-07-02 20:27:19 cehteh maybe possible
2021-07-02 20:28:28 meltyness Architecturally, optimal is obviously SIMD, but it's not clear how to signal that in rust to the compiler -- maybe changing the header to include the datatype to be operated on
2021-07-02 20:28:58 cehteh then back to array and mix.contains(Red) && mix.contains(Blue) => Purple
2021-07-02 20:29:45 cehteh might be possible and maybe evne optimized nicely
2021-07-02 20:29:56 cehteh but i am doing other stuff now
2021-07-02 20:30:11 meltyness cehteh - that was what I did with iter, initially
2021-07-02 20:32:59 meltyness oh hey yeah so passing it as a reference to an array is faster
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2021-07-02 20:33:31 cehteh ayway i am out
2021-07-02 20:34:07 meltyness thanks again for letting me borrow your brain :]
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2021-07-02 22:18:15 meltyness ... hm ... is the mpsc Sender<T> reference counted?
2021-07-02 22:19:41 meltyness I guess it must be, but probably implementation details should be backend / unstable
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2021-07-02 22:23:39 jbg meltyness: you can cheaply clone it, and the channel keeps working as long as at least one is alive. it doesn't promise *how* it achieves that (it probably just wraps an Arc) but you shouldn't generally need to care either
2021-07-02 22:24:35 meltyness jbg: it was easy enough to get at the source, in this case. it's just a matter of how it's built since that's how the spec is written
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2021-07-03 00:12:51 wirez why don't rust foundation take over servo? it's perfect flagship project to show off rust
2021-07-03 00:12:56 wirez !!
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2021-07-03 00:17:22 jbg seems like a large distraction for a language foundation to take on a browser engine project
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2021-07-03 00:18:08 jbg apart from the question of whether the servo project wants/needs to be "taken over"
2021-07-03 00:18:42 jbg lol whoops they left 10 seconds later
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2021-07-03 00:32:51 meltyness "After running the code, the precedence behavior is evident:" thats a yikes
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2021-07-03 06:38:04 RedCrab Heya! I want to include a `/api/version` endpoint in my API, and want to include the git hash and version (from Cargo). The cargo version I'm thinking of deserializing from the Toml file and grabbing the version that way. The git part I'm a bit more stumped on. Is there a good way to go about this?
2021-07-03 06:38:41 j`ey RedCrab: https://docs.rs/git-version/0.3.4/git_version/
2021-07-03 06:42:23 Arnavion And the crate version is already in the CARGO_PKG_VERSION env var
2021-07-03 06:43:06 j`ey (that you can read with env!(), not the std::env functions)
2021-07-03 06:43:28 RedCrab Oh, that's really nice! Thanks
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2021-07-03 06:45:15 Arnavion You may also prefer to specify the git hash via a cargo-build wrapper (like a Makefile) that sets it as a regular env var also, so that you can read it the same as CARGO_PKG_VERSION
2021-07-03 06:46:07 j`ey if youre not already doing that, proc_macro is nicer :P
2021-07-03 06:47:42 RedCrab j`ey: I'm still stumbling over creating macros. I feel like I have a good handle on most other things. So for now I'll probably stick with the env var option
2021-07-03 06:47:56 Arnavion Yes, it mostly helps because it's easy to strip out, say if you're doing a dev release where you want the hash vs a proper release where you don't
2021-07-03 06:48:29 Arnavion Also it saves on a couple of deps, not in the least because that macro is just a long-winded way of writing std::process::Command::new("git").arg("rev-parse").output()
2021-07-03 06:48:38 j`ey RedCrab: well you dont need to create one, that git_version crate i linked you to, is doing it for you
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2021-07-03 07:05:03 rk4 suppose your program had parts A,B,C, there's a method of determining which part you should work on to optimize it that looks like this: to test if doubling the speed of A would make a difference, make B & C twice as slow. there's paper on this idea and a framework to automatically do it (by making your functions twice as fast)...anyone know what i'm talking about? be damned if i can remember
2021-07-03 07:05:25 rk4 *by making your functions twice as slow
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2021-07-03 07:08:57 discipulus I vaguely remember
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2021-07-03 07:17:07 saati i've read about it too
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2021-07-03 08:13:46 osa1 rk4: I think you're looking for coz: https://github.com/plasma-umass/coz
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2021-07-03 09:13:47 rk4 that's it, thanks!
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2021-07-03 10:19:08 Helmholtz1 Is there a way to measure complexity of a project? Like how difficult is it to write something like this ? https://github.com/dflemstr/rq
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2021-07-03 10:20:21 nCrazed Helmholtz1: I am not following how rq connects to your question
2021-07-03 10:20:32 saati ther are various source line count tools that also give some (wildly inaccurate) estimations on development time
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2021-07-03 10:21:18 Helmholtz1 nCrazed, as an example
2021-07-03 10:21:56 meltyness ...how many Traits does it define?
2021-07-03 10:21:57 Helmholtz1 saati, So in Rust roughly more lines of code => more complex ?
2021-07-03 10:22:16 nCrazed it sounds like you're asking about something like cyclomatic complexity of source code, but rq looks more about exploring data
2021-07-03 10:22:43 j`ey Helmholtz1: how are you measuring complexity of other languages?
2021-07-03 10:23:11 meltyness Helmholtz1: https://github.com/dflemstr/rq/blob/56f6314995ea9b5988b2f5e2fd547d8758eae523/src/value/mod.rs ... here's the rub.
2021-07-03 10:23:15 Helmholtz1 j`ey, In java, number of classes, number of methods
2021-07-03 10:23:23 j`ey then you can do a similar thing with rust
2021-07-03 10:23:32 j`ey number of structs, number of methods, number of traits etc
2021-07-03 10:23:46 j`ey (but that doesnt mean complexity, it just means size..)
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2021-07-03 10:28:31 Helmholtz1 I think rq is one of the coolest Rust projects out there? Is there something similar in Rust?
2021-07-03 10:28:52 Helmholtz1 s/?/.
2021-07-03 10:28:57 meltyness Helmholtz1: traits are kind of like an interface ... that can a proxy for the amount of complexity -- since each module implementing a trait doesn't really add any more complexity, just additional bulk
2021-07-03 10:29:28 hendursa1 ]'
2021-07-03 10:30:07 meltyness Helmholtz1: You mean like a tool for querying MIR / HIR?
2021-07-03 10:30:17 meltyness I mean cargo docs kinda does that
2021-07-03 10:30:49 Helmholtz1 meltyness, just format conversion
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2021-07-03 10:31:06 j`ey format conversion of what?
2021-07-03 10:31:22 Helmholtz1 from json/MessagePack/XML to each other
2021-07-03 10:31:30 j`ey you said rq is a cool rust project,mand ask if there is something similar in rust..?
2021-07-03 10:31:34 Helmholtz1 structured data format conversion
2021-07-03 10:32:33 Helmholtz1 j`ey, I meant other famous projects with similar scope and functionality
2021-07-03 10:32:42 saati Helmholtz1: so god objects and methods with a lot of flags decrease complexity?
2021-07-03 10:32:58 nCrazed dota format converstion? so like serde? :D
2021-07-03 10:32:58 j`ey Helmholtz1: ripgrep
2021-07-03 10:33:03 jbg the question is pretty unclear but ripgrep is another quite famous rust project which also deals with data
2021-07-03 10:33:03 jbg snap
2021-07-03 10:33:22 jbg "which also deals with data" lol, like every program ever
2021-07-03 10:33:24 jbg but you know what I mean
2021-07-03 10:33:40 j`ey rg isn't structured data
2021-07-03 10:34:04 j`ey otherwise i don't know any similar projects to rq
2021-07-03 10:34:08 jbg while that's true, grep (and rg) are often used on structured data, they just don't actually operate on the structure ;)
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2021-07-03 10:35:55 meltyness yeah and that starts to get into language representation which is an extremely ugly matter in and of itself
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2021-07-03 10:37:34 meltyness https://en.wikipedia.org/wiki/Regular_language
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2021-07-03 10:38:05 meltyness OK 2 more chapters of TRPL... LETS GO!!
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2021-07-03 11:03:28 meltyness lol "screaming snake case"
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2021-07-03 11:53:00 Helmholtz1 Is there a Webscraper with JS engine built-in CLI tool>
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2021-07-03 12:43:53 meltyness never has a programming language tutorial handed the AST on a silver platter to me before. wow
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2021-07-03 14:48:24 Tv_ i want to test a component that uses and unsets environment variables. fixed names. is there an easy way to mock that, e.g. some trait that i can implement with os env and a HashMap or such
2021-07-03 14:48:36 Tv_ (or do i get to shave that yak first)
2021-07-03 14:51:37 Tv_ an easy way out would be to just use a prefix on all the variables it touches.. can a test figure out its own name, or do i need to create safe prefixes some other way?
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2021-07-03 14:54:24 Tv_ ehh maybe just serial_test and use the real environment
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2021-07-03 14:56:25 trev do unit tests setting env vars interfere with each other? maybe you can do the trick where you use Command to launch the current test (since you can get the name of the current test executable)
2021-07-03 14:57:02 Tv_ trev: they all want to touch the same few env vars
2021-07-03 14:57:50 Tv_ i could pass in a prefix, but then i need to manage unique prefixes somewhere
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2021-07-03 14:58:46 trev i think that using Command to re-launch the test executable and passing in the env might work
2021-07-03 14:58:57 Tv_ i guess a static mutex and a prefix that's something like TEST_<sequence number>_ would be fine
2021-07-03 14:59:49 Tv_ static atomic i guess
2021-07-03 15:01:10 cehteh Tv_: we had/have some discussion about env var setting which turns out to be a minefield
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2021-07-03 15:01:48 cehteh https://internals.rust-lang.org/t/why-should-std-var-panic/14847
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2021-07-03 15:03:01 cehteh Tv_: when you test a command then you can use my new testcall stuff, i am working on it, the env var api isnt defined yet, but its on the todo list really soon, you may as well do it and send me a PR :D
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2021-07-03 15:03:40 Tv_ cehteh: this is a library not a command though
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2021-07-03 15:03:53 Tv_ systemd socket activation; couldn't find a good enough one already written
2021-07-03 15:04:29 cehteh i recommend reading the discussion of the link above
2021-07-03 15:04:58 cehteh and i am just back from a bike tour, need to rehydrate and a shower be back in a half an hour
2021-07-03 15:06:09 cehteh when you are interested in creating a test directory/fixtures/assertions i'd like if you take a look at the stuff i am currently working on (testcall crate, but newest things on master are not released, i'll work on that later seeing to complete that later today)
2021-07-03 15:08:59 Tv_ i'm not clear on why you think that to be very relevant
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2021-07-03 15:09:40 Tv_ i mean, apart from the fact that unix environment is global process state without anything guarding it? that doesn't smell like my problem, really...
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2021-07-03 15:11:37 capitol Tv_: are you using glibc? You might be walking into a minefield: http://rachelbythebay.com/w/2017/01/30/env/
2021-07-03 15:12:26 Tv_ this is a startup time action
2021-07-03 15:12:32 cehteh then its ok
2021-07-03 15:12:41 Tv_ if glibc wrecks a process without being asked to, that's a glibc problem ;)
2021-07-03 15:12:57 cehteh as long you have no threads that do ffi calls its ok
2021-07-03 15:13:08 capitol well, it's your unit tests that will be flappy :P
2021-07-03 15:13:14 Tv_ the only non-startup time call to this are the tests
2021-07-03 15:13:31 Tv_ and i sure hope they don't go around resolving DNS names for no reason
2021-07-03 15:14:02 cehteh also setenv/environ at startup is ok .. but 'at startup' implies that you call some executable, maybe the test harness linking your lib and tests
2021-07-03 15:14:03 Tv_ though maybe i should shove these links into the docs
2021-07-03 15:14:15 cehteh anyway ... bbl
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2021-07-03 15:23:47 meltyness I wrote 2,815 lines of rust learning Rust :O
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2021-07-03 15:47:31 cehteh so re
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2021-07-03 15:59:12 kee Rust LTO works with statically-linked C code, right?
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2021-07-03 16:01:21 cehteh would be interesting if it could LTO those C things .. even when build with gcc lto, and no i dont know, but i'd expect to 'work' as in not introducing bugs at least
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2021-07-03 16:02:00 kee Ah, I have the wrong clang version for my Rust version. That explains it.
2021-07-03 16:02:02 kee https://doc.rust-lang.org/rustc/linker-plugin-lto.html#toolchain-compatibility
2021-07-03 16:02:30 cehteh ah .. yes lto is kindof black magic :)
2021-07-03 16:03:02 cehteh gcc lto on microcontroller, then looking at the generated asm gave me big WTF's
2021-07-03 16:03:58 cehteh puts all your code into a blender, sifting it, and glues the fragments back together :)
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2021-07-03 16:05:09 kee The huge 0.001% performance improvement is worth the minor increase in debugging difficulty.
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2021-07-03 16:07:06 cehteh actually in some cases it can have pretty decent performance improvements and even more space savings, but it depends extremely on the actualy project
2021-07-03 16:07:33 cehteh things like 40% faster and 50% smaller is what i've seen in some corner cases
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2021-07-03 16:08:03 cehteh (usually less, but still significant)
2021-07-03 16:08:28 cehteh while you shouldnt debug a lto build anyway
2021-07-03 16:08:39 kee What if the bugs only show up when LTO is enabled?
2021-07-03 16:08:47 cehteh if normal build works and lto fails its another problem
2021-07-03 16:08:59 cehteh file a bug to the compiler team
2021-07-03 16:09:04 kee Fortunately this is ##rust so that will never happen.
2021-07-03 16:09:10 cehteh lol
2021-07-03 16:09:21 kee I imagine some badly-written C code could have an issue with LTO without it being a compiler bug.
2021-07-03 16:09:28 kee Undefined Behaviour is the bane of my existence.
2021-07-03 16:09:34 cehteh lto isnt rust stuff its deeper in the llvm guts
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2021-07-03 16:11:44 kee Did you know that the standard library isn't LTO'd any more (unless you set lto=true)?
2021-07-03 16:12:08 cehteh i know that lto isnt default
2021-07-03 16:12:21 cehteh but i dont know how the stdlib is compiled
2021-07-03 16:13:02 cehteh also incremental build got disabled becasue of bugs, that actually happend to me (in nightly where its still on , i had to turn incremental off)
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2021-07-03 16:13:36 j`ey it's back on now, are you sure it isnt fixed for you?
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2021-07-03 16:15:03 cehteh [22:12] <cehteh> i know that lto isnt default
2021-07-03 16:15:05 cehteh [22:12] <cehteh> but i dont know how the stdlib is compiled
2021-07-03 16:15:07 cehteh [22:13] <cehteh> also incremental build got disabled becasue of bugs, that actually happend to me (in nightly where its still on , i had to turn incremental off)
2021-07-03 16:15:10 cehteh [22:13] <cehteh> managed to improve test build times from 1m20s to <5sec :D
2021-07-03 16:15:12 cehteh [22:13] <cehteh> w/o incremental .. haha
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2021-07-03 16:15:53 j`ey it's back on now, are you sure it isnt fixed for you?
2021-07-03 16:17:01 cehteh havnt tried (still nightly) but i do some ugly stuff which wont make me wonder if its stil broken
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2021-07-03 16:18:41 cehteh creating a directory for the test build, prime that with the prev build by cp -lr, then unpack the current source on top of that. that confused cargos file signatures somehow in incremetal builds
2021-07-03 16:19:28 cehteh https://github.com/cehteh/uberallfs/blob/master/.githooks/pre-commit
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2021-07-03 16:30:13 kee Hmm. Unsafety in the standard library isn't a cause for breaking changes?
2021-07-03 16:30:57 j`ey you mean something that is unsound or?
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2021-07-03 17:19:38 kee j`ey: Yeah, unsoundness, sorry.
2021-07-03 17:19:50 kee A safe API that isn't safe.
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2021-07-03 17:33:36 keyvan hi. i am embarking on my rust journey today. very excited.
2021-07-03 17:34:37 la_mettrie no need to be excited, it's gonna be a safe journey
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2021-07-03 17:35:01 keyvan haha! :)
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2021-07-03 17:39:23 j`ey kee: that can break stability yeaj
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2021-07-03 17:54:43 meltyness jesus h christ: https://www.kernel.org/doc/html/latest/networking/kapi.html#network-device-support
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2021-07-03 17:59:30 Tv_ meltyness: what about it? looks like pretty typical "OOP in C" that linux does. (i know linux kernel better than i know rust ;)
2021-07-03 18:00:01 meltyness so i need to make a regex to turn the flat functions into a hierarchy or something?
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2021-07-03 18:00:27 j`ey meltyness: did you paste the wrong link?
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2021-07-03 18:00:33 Tv_ meltyness: it's, there's no hierarchy anyway? these sorts of bindings are usually handwritten
2021-07-03 18:00:37 Tv_ *it's C
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2021-07-03 18:00:55 Tv_ assuming you're trying to write rust for linux kernel
2021-07-03 18:01:00 Tv_ if not, then no idea what's going on
2021-07-03 18:01:43 j`ey unless you mean youre writing bindings and are talking about the fact that dev_remove_pack has a __ infront of it?
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2021-07-03 18:01:45 Tv_ meltyness: what *are* you doing?
2021-07-03 18:01:57 Tv_ __ is the linux convention for "caller holds lock"
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2021-07-03 18:02:22 meltyness I'm entertaining the prospect of building ... uh a network thing
2021-07-03 18:02:58 meltyness so grabbing from coreutils output is obviously wrong
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2021-07-03 18:03:07 meltyness and grabbing from KAPIs is apparently impenetrable
2021-07-03 18:03:25 Tv_ those two are.. very different
2021-07-03 18:03:30 Tv_ KAPI = *kernel* api
2021-07-03 18:03:59 Tv_ meltyness: what information are you trying to grab?
2021-07-03 18:04:28 meltyness ip link
2021-07-03 18:04:38 meltyness i guess i could look at the source for ip link huh?
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2021-07-03 18:05:20 Tv_ meltyness: netlink
2021-07-03 18:05:34 Tv_ https://github.com/little-dude/netlink or such
2021-07-03 18:06:08 Tv_ i guess https://github.com/jbaublitz/neli might be better
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2021-07-03 18:09:19 meltyness hmm Tv_ thanks for the food for thought
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2021-07-03 18:46:15 meltyness today i learned: ctags
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2021-07-03 18:50:09 Swahili Q: Output from print statements fail to stdout when `cargo test`. Found that `cargo test -- --nocapture` solves it. Is there a reason why its omitted and is there another way to show it when running tests?
2021-07-03 18:50:41 Lumpio- Probably because unit tests aren't really meant to print stuff
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2021-07-03 18:50:42 danieldg it's shown for failing tests
2021-07-03 18:50:46 j`ey Swahili: that is the way to show it
2021-07-03 18:50:48 Lumpio- All the time
2021-07-03 18:51:14 Lumpio- If you have a test that does something like benchmarking or whatever instead of unit testing and you want to see the results when you it every time, you can make a test without the harness
2021-07-03 18:51:17 danieldg the goal is that you have a bunch of debug output to help determine why a test fails
2021-07-03 18:51:18 Swahili danieldg: that's correct, it does show when fail
2021-07-03 18:51:22 Swahili j`ey: thanks!
2021-07-03 18:51:27 Lumpio- Then it's just a normal program that can print stuff, but it will still run when you run tests
2021-07-03 18:51:38 Swahili Lumpio-: ok :)
2021-07-03 18:51:45 Swahili Thank you very much!
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2021-07-04 08:05:52 DRG Hi! Can someone help me with serde? I'm working with an API, and it returns a JSON, like this "p": {"SOME_ID": "succes"}, that ID, is known at run time, but not at compile time, how would i deserialize that with serde?
2021-07-04 08:06:18 <-- neceve (~quassel@2a02:c7f:607e:d600:f762:20dd:304e:4b1f) has quit (Ping timeout: 240 seconds)
2021-07-04 08:06:38 DRG That JSON is obviously way more complex, but that's the simplest relevant part, and i really need to desrialize that part
2021-07-04 08:06:41 Mutabah Probably just using `serde_json`
2021-07-04 08:06:50 DRG duhh
2021-07-04 08:07:03 DRG It's about deserializing that ID
2021-07-04 08:07:09 Mutabah Or, maybe `#[serde(deserialize_with)]`?
2021-07-04 08:07:19 Mutabah Depends on what structure you want to put it int
2021-07-04 08:09:07 DRG the simplest way i could name the JSON is "SOMEID": "a random string", the problem is, that with serde, if you want to deserialize, you'd make a struct or something, and in that struct you'd have the content of that ID to deserialize.
2021-07-04 08:09:10 DRG So that would be:
2021-07-04 08:09:16 DRG Struct Deser {}
2021-07-04 08:09:19 DRG F
2021-07-04 08:09:27 DRG Struct deser {id343: String}
2021-07-04 08:09:37 DRG but that only works if you know the ID at compile time
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2021-07-04 08:11:06 Mutabah Is that ID dynamic, or runtime static? Is it alone in the structure?
2021-07-04 08:11:37 bikeshedder DRG, the easiest way would be to use `serde_json::Value` for that.
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2021-07-04 08:11:58 DRG That Id is know at runtime, but not static
2021-07-04 08:12:02 Mutabah You could have `#[serde(inline)] some_id_value: SomeId,` and have a custom `Deserialize` impl for `SomeId`
2021-07-04 08:12:26 DRG I make 10k requests to an API, with 10k different ID's, but the ID in the response is equal to the ID i send to the apI
2021-07-04 08:12:26 Mutabah s/inline/flatten/
2021-07-04 08:12:38 bikeshedder Ah, I see what your problem is (and what the API is doing)
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2021-07-04 08:12:43 DRG but that Id is different each request, because I want different data
2021-07-04 08:13:32 bikeshedder DRG, the easiest way would be use a `HashMap` for that.
2021-07-04 08:13:53 DRG Lets say it's an api which returns the type of tree, i'd request "api.tree.org/tree?id=ID" and it would return ""id": {"spec 1": {"id": id, "type": birch} }
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2021-07-04 08:14:43 Mutabah Is it just the top level? In which case, grab as a `serde_json::Value`, get the member you want, then deserialise
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2021-07-04 08:15:52 bikeshedder DRG, I'd opt for a `HashMap` and at the code level assert that it just contains one entry. If you don't like the extra HashMap allocation you need to create a custom struct and implement the Deserialize trait for it.
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2021-07-04 08:17:37 -- alexxxxxey is now known as alexxey
2021-07-04 08:17:38 DRG I though about using a hashmap, but the API is even worse, Let me make a full example, because you can (and have to) use multiple Id's per request: api.tree.org/tree?idOne=id1&idTwo=id2&idThree=id3. Then the JSON wil return a response with "RESPONSE": {Leaftype: {"id1": {name: "leafType", values: {"id1": {"veins": false, "color":green}}}}}
2021-07-04 08:17:56 DRG and then that repeats for every ID
2021-07-04 08:18:06 cehteh mhm dunno serde that much, but i'd expected that you can do something like struct Identifier { id: String, success: bool } and create some custom serializer for that?
2021-07-04 08:18:25 cehteh (or maybe even u64 or whatever works for identifier)
2021-07-04 08:18:28 DRG no you can't, because then id would actually have to be named ID in th JSON
2021-07-04 08:18:47 DRG but its named "2324243" or "24254" or "24098" or "97843"
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2021-07-04 08:18:58 cehteh cant you define custom serializers for single structs?
2021-07-04 08:19:13 DRG You can, but I'm lazy :P
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2021-07-04 08:19:21 cehteh lol well
2021-07-04 08:19:55 cehteh when it needs to be done then you have to do it, or at least give crates.io a search, i bet someone did that before
2021-07-04 08:20:58 DRG That API is just pure trash, maybe I'm better of trying to discover some private API they use, which returns usable json
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2021-07-04 08:28:40 Mutabah Custom deserialiser (you just need one), or go though a HashMap to start with
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2021-07-04 09:37:55 bikeshedder DRG, just use a `HashMap` if you're lazy. It will always contain just one entry... call it the day then. ;-)
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2021-07-04 10:22:27 cehteh test result: FAILED. 13 passed; 13 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
2021-07-04 10:22:33 cehteh break even!!!
2021-07-04 10:22:53 meltyness are we refactoring?
2021-07-04 10:23:10 cehteh no TDD :) just written the tests
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2021-07-04 10:23:40 cehteh now the real work begins
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2021-07-04 12:14:44 quechon wat up good people
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2021-07-04 12:30:31 db48x the daystar, some clouds
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2021-07-04 14:33:19 meltyness does runtime reflection equate to bad design? :<
2021-07-04 14:35:43 mike-burns It has tradeoffs, and you have to evaluate those tradeoffs for your project.
2021-07-04 14:38:54 dcz_ is there anyone from the risc-v working group here? I'm wondering how easy/hard it is to implement an USB abstraction for gd32v103
2021-07-04 14:39:10 dcz_ thinking about copy-pasting the stm32 code
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2021-07-04 15:19:03 safinaskar is case of first letter of identificator important in rust?
2021-07-04 15:20:09 j`ey safinaskar: https://rust-lang.github.io/api-guidelines/naming.html
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2021-07-04 15:21:50 safinaskar j`ey: thanks, but this is merely advice, and if i violate it, my programs will still compile?
2021-07-04 15:22:26 j`ey yes
2021-07-04 15:22:27 danieldg all naming policies are just advisory, yes
2021-07-04 15:24:07 safinaskar and all this conventions are checked by compiler in default warning level?
2021-07-04 15:24:29 j`ey yeah
2021-07-04 15:24:40 safinaskar j`ey: danieldg: ok, thanks
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2021-07-04 15:37:13 safinaskar is it possible to iterate over HashMap using for-loop?
2021-07-04 15:37:25 j`ey safinaskar: yes
2021-07-04 15:37:50 j`ey safinaskar: https://doc.rust-lang.org/std/collections/struct.HashMap.html example near the top of the page
2021-07-04 15:37:58 j`ey sorry https://doc.rust-lang.org/std/collections/struct.HashMap.html#examples near the bottom
2021-07-04 15:38:39 safinaskar j`ey: thanks
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2021-07-04 17:05:33 meltyness when the borrow checker lets you win
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2021-07-04 17:06:38 meltyness is there a good way to tell if lifetimes let me create a memory leak?
2021-07-04 17:07:09 GreenJello they don't impact behavior
2021-07-04 17:07:31 meltyness hm?
2021-07-04 17:07:52 GreenJello lifetimes just determine whether the code compiles or not
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2021-07-04 17:09:25 GreenJello if you use them incorrectly, but it still compiles, then it's the same as using them correctly (except that it'll be overly restrictive when you try to change the code later)
2021-07-04 17:09:34 danieldg meltyness: memory leaks only happen when ownership changes, lifetimes are all about borrows
2021-07-04 17:11:39 saatii is there anything else that can cause a leak apart from (a)rc circles and intententional use of leak methods?
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2021-07-04 17:13:05 GreenJello with a fairly strict definition of memory leaks, it's that and other things similar to leak, like various into_raw methods
2021-07-04 17:13:28 GreenJello (if you never rebuild the things and drop it properly)
2021-07-04 17:14:52 meltyness hmm -- well it doesn't seem to leak the way it's written
2021-07-04 17:15:22 meltyness I guess I just need to trace the code to understand why those lifetimes were being required of the compiler
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2021-07-04 17:25:19 safinaskar is there some concise article on placing "&" in for loop syntax and performance implications of that?
2021-07-04 17:26:34 danieldg safinaskar: into_iter vs iter (or &T's into_iter)
2021-07-04 17:27:20 danieldg ownership vs borrows; for things like vec of Copy data it's likely to optimize to the same thing
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2021-07-04 17:45:50 Guest3143 coming from a c# background, would you recommend writing rust with a LINQ equivalent or to adopt a different mindset?
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2021-07-04 17:50:52 safinaskar is there a way to indicate in source itself that this is rust 2018?
2021-07-04 17:51:21 est31 no
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2021-07-04 17:52:06 est31 it's either indicated by a parameter to rustc
2021-07-04 17:52:33 est31 or by some incantation in your build system (that then passes that param)
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2021-07-04 17:54:00 jpds It's also set in Cargo.toml ?
2021-07-04 17:54:23 j`ey that's the incantation in the build system :P
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2021-07-04 17:56:33 est31 yup
2021-07-04 17:59:44 est31 in fuchsia, it's in the build.gn https://fuchsia.googlesource.com/fuchsia/+/cb1ce55ac9ff4abd13a7ae8ac1a5ff9f3056d9e8/src/power/battery-manager/battery-cli/BUILD.gn#11
2021-07-04 18:02:00 saatii what's a .gn?
2021-07-04 18:02:49 j`ey gn build system
2021-07-04 18:02:56 j`ey like a makefile
2021-07-04 18:03:16 j`ey (well gn is a meta build system since it generates ninja, but close enough)
2021-07-04 18:04:12 jpds Needs more gin
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2021-07-04 18:27:07 safinaskar is there a way to specify rustc params at the top of source?
2021-07-04 18:27:18 safinaskar in haskell i can do this using OPTIONS_GHC
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2021-07-04 18:27:51 danieldg I think you have to use Cargo.toml for that
2021-07-04 18:28:50 j`ey .cargo/config.toml
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2021-07-04 18:33:01 safinaskar ok
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2021-07-04 19:10:58 jeho2 just wrote and rewrote an implementation for an AVL tree about 5 times until I figured out the cleanest least noisy way of doing it.
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2021-07-04 19:13:08 jeho got rid of all the unnecessary overhead with shared smart pointers.. implemented my own safe pointer type
2021-07-04 19:13:51 jeho eliminated the extra verbosity that I usually have with rust
2021-07-04 19:16:58 meltyness I've got an extra Rc strong bouncing around but I'm not sure where :(
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2021-07-04 19:20:54 meltyness oh hey -- found it!
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2021-07-04 19:21:51 jeho in C++ i used to override the new keyword to create an entry in a vector for each new invoked with other metadata, and override delete to remove the entries from the vector.. and put some extra code in to list all the un deleted pointers when closing the app to find memory leaks
2021-07-04 19:24:09 meltyness Isn't access in a vector O(N) ?
2021-07-04 19:24:39 jeho no.. O(1) for accesses
2021-07-04 19:24:48 jeho O(N) for insertions and deletions
2021-07-04 19:25:33 jeho i used a debug flag so new/delete wouldn't be overridden in release builds
2021-07-04 19:27:26 meltyness I got a neatly extensible shell put together that doesn't have any dependencies, so that's kind of a victory.
2021-07-04 19:29:00 jeho well done
2021-07-04 19:31:16 jeho i suppose if ever Rc was driving me nuts with a leak somewhere I'd just take the Rc code and put in its own .clone() method to track where the new instances are coming from
2021-07-04 19:33:20 meltyness I was struggling with downcasting
2021-07-04 19:34:11 meltyness since part of that neat extensibility means some commands can have attached functions, and other commands change an outer state, based on the message.
2021-07-04 19:34:20 jeho for my avl tree i got away with only needing Box<>.. with the Tree being an enum of Filled(Box<Node<>>) or Empty.. and implemented Deref on Tree so I could access the fields of Node without extra code
2021-07-04 19:35:03 jeho each node is Node<> { key, value, left: Tree, right: Tree }
2021-07-04 19:36:13 meltyness is Filled your custom pointer?
2021-07-04 19:36:55 jeho yeah.. Tree is.. it's not technically a pointer, it just represents the presence of another node or absence
2021-07-04 19:37:18 jeho but since I implemented Deref for Tree.. I guess it's very much like a pointer
2021-07-04 19:37:54 jeho with that approach i got rid of a lot of extra verbosity.. and was able to implement it in about as many lines as it would take in C++
2021-07-04 19:38:50 jeho the implementation looks really clean.. i'm overjoyed
2021-07-04 19:39:46 jeho https://github.com/ttappr/avl-tree/blob/main/src/tree.rs
2021-07-04 19:41:13 jeho the rotate methods were the pieces that benefitted most from the reduction in verbosity
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2021-07-04 19:48:03 db48x meltyness: what kind of shell are you building?
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2021-07-04 19:53:01 meltyness ... what kind of shell are you interested in >:)
2021-07-04 19:54:44 meltyness honestly, i'm trying to port netsh
2021-07-04 19:54:49 meltyness that old windows thing
2021-07-04 19:55:17 meltyness probably already been done in some capacity, assuredly not well
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2021-07-04 19:57:46 db48x ah
2021-07-04 19:58:49 db48x I’ve not used Windows in a while, and never used netsh, but I see what you mean
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2021-07-04 20:00:06 db48x I spent some time prototyping a shell in Rust too
2021-07-04 20:00:12 db48x http://db48x.net/reposurgeon/repl-demo-4/
2021-07-04 20:00:27 cehteh meltyness: you develop rust on windows?
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2021-07-04 20:00:59 meltyness my environment is in virtualbox
2021-07-04 20:01:04 meltyness on debian
2021-07-04 20:01:23 cehteh heh ... lol
2021-07-04 20:01:44 cehteh i havent found a rust developer using windows yet :D
2021-07-04 20:02:06 db48x they supposedly exist
2021-07-04 20:02:12 meltyness i broke my windows install lol
2021-07-04 20:03:00 meltyness db48x that's really nice shell interaction, is that all custom logic or is there a crate?
2021-07-04 20:03:02 jeho i live in a virtual box
2021-07-04 20:03:39 jeho I absolutely HATE mac OS.. so I do everything on linux in virtualbox on my system
2021-07-04 20:03:51 cehteh well eventually i would like when someone tests and ports some things i am working on to windows since i dont have windows, i may setup the github actions but thats pretty ugly when you dont really develop on it,
2021-07-04 20:04:52 meltyness I'm still on windows cause I couldn't figure out how to boot from RAID -- so instead my linux drive is a .vdi on my RAID 0
2021-07-04 20:05:13 cehteh those crappy hardware raids?
2021-07-04 20:05:33 cehteh eh moment raid0? like living on the dangerous side?
2021-07-04 20:05:54 cehteh who/why would anyone use that as boot drive
2021-07-04 20:06:12 meltyness someone whose motherboard was reviewed on LTT episode #3
2021-07-04 20:06:27 cehteh LTT is what?
2021-07-04 20:07:04 cehteh and no, never ever use raid on consumer motherboards
2021-07-04 20:07:19 meltyness a youtube channel thats been around since 2008 -- oh i benched it, the bandwidth is good
2021-07-04 20:07:27 cehteh thats just for crappy OS'es it wont improve performance or reliability
2021-07-04 20:07:44 cehteh benchmarked it against what?
2021-07-04 20:08:01 cehteh and raid0 is a call for desaster
2021-07-04 20:08:44 meltyness I'm well aware, it's only for stuff that's already backed up
2021-07-04 20:09:07 jeho you are well protected from the dangers of cosmic rays corrupting your data
2021-07-04 20:09:28 cehteh lol ... earlier today: https://groups.google.com/a/chromium.org/g/ct-policy/c/PCkKU357M2Q/?pli=1
2021-07-04 20:13:28 cehteh back to rust: anyone of you can recommend a crate for copying directories and files?
2021-07-04 20:13:58 db48x meltyness: I use the Rucline crate, and implemented that specific UI on top of it
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2021-07-04 20:49:08 wirez https://blog.rust-lang.org/inside-rust/2021/07/01/What-the-error-handling-project-group-is-working-towards.html talks about adding a Report type but that sounds too generic to just use for errors. like maybe you want a performance report later?
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2021-07-05 01:40:49 Guest64 hello
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2021-07-05 01:43:55 Guest64 guys what is the rust equivalent of python requests ?
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2021-07-05 01:44:48 mike-burns Probably the reqwest crate.
2021-07-05 01:45:24 Guest64 alright bro mike-burns
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2021-07-05 03:09:32 tomboy64 i want to create a Vec<Vec<_>> from an Iterator, where the nested Vec's length is determined.
2021-07-05 03:09:46 tomboy64 i noticed advance_by for iterators is experimental
2021-07-05 03:10:14 tomboy64 suggestions on how to do it without restarting the Iterator over and over again?
2021-07-05 03:10:31 tomboy64 all nested Vec's are of the same length
2021-07-05 03:15:09 Mutabah Hmm...
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2021-07-05 03:15:42 tomboy64 i thought about using the .flatten() function from iterator
2021-07-05 03:15:55 Mutabah `let mut it = get_iterator; while it.peek().is_some() { rv.push( it.by_ref().take(inner_size).collect() ); }`
2021-07-05 03:16:32 Mutabah Something like that maybe
2021-07-05 03:17:36 tomboy64 hmm
2021-07-05 03:19:24 rk4 Mutabah: was wondering this morning, was your mrustc work funded?
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2021-07-05 03:33:12 Mutabah rk4: nope
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2021-07-05 03:34:44 Guest56 hello
2021-07-05 03:35:08 rk4 interesting, so why'd you do it? sizable amount of work, pretty niche, i have no doubt you can make a lot more money per hour than i if you had decided to do something else
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2021-07-05 03:35:44 Mutabah Well, I was a student when I started... but the main reason was "fun"
2021-07-05 03:36:20 Guest56 i would like to know how to use reqwest from importing it a program to performing http requests
2021-07-05 03:36:40 Mutabah There's something enjoyable about working on something because you want to - and being able to just bail for a few months if it gets too hard/boring
2021-07-05 03:37:16 capitol etu[m]: yeah, that's how i do hobby programming also :)
2021-07-05 03:37:45 osa1 with const generics can I pass a const bool argument and check it in compile time?
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2021-07-05 03:38:12 rk4 Guest56: https://github.com/seanmonstar/reqwest has an example, i'd start there
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2021-07-05 03:38:41 Guest56 ok @rk4 i will look at it
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2021-07-05 05:16:10 bertptrs osa1: kind of but it's not like C++'s "constexpr if" and both the if and else should be valid
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2021-07-05 05:17:48 osa1 that's good enough, thanks
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2021-07-05 05:57:38 rk4 Mutabah: nice :)
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2021-07-05 06:12:04 totenkoph + /allpv
2021-07-05 06:12:13 totenkoph buffer clear
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2021-07-05 06:28:04 osa1 clamp for i32/i64/etc. when?
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2021-07-05 06:29:37 j`ey https://doc.rust-lang.org/std/cmp/trait.Ord.html#method.clamp osa1
2021-07-05 06:29:55 j`ey evalr2: 10.clamp(0, 5)
2021-07-05 06:29:59 -- Notice(evalr2): j`ey: 5
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2021-07-05 06:31:39 osa1 j`ey: ahh, f32/f64 have it as methods as they're not Ord. makes sense, thanks!
2021-07-05 06:31:52 j`ey yeah
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2021-07-05 09:42:21 janik majors:
2021-07-05 09:42:43 janik note to self: don't cycle through user list by pressing tab. Sorry.
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2021-07-05 09:55:24 Guest37 my reqwest code:
2021-07-05 09:55:44 Guest37 extern crate reqwest;
2021-07-05 09:55:44 Guest37 pub async fn request(){
2021-07-05 09:55:45 Guest37 let response=reqwest::get("https://junaidbashir-kernel.github.io/dropsofmyheart.github.io/")
2021-07-05 09:55:45 Guest37 .await
2021-07-05 09:55:46 Guest37 .expect("read error")
2021-07-05 09:55:46 Guest37 .text()
2021-07-05 09:55:47 Guest37 .await
2021-07-05 09:55:47 Guest37 .expect("read error");
2021-07-05 09:55:48 Guest37 println!(" body = {:?}",response);
2021-07-05 09:55:48 Guest37 }
2021-07-05 09:55:52 Guest37 my main code:
2021-07-05 09:56:01 j`ey Guest37: dont post code!
2021-07-05 09:56:28 j`ey Guest37: use https://play.rust-lang.org/?version=stable&mode=debug&edition=2018
2021-07-05 09:56:42 Guest37 ok
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2021-07-05 09:56:59 Guest37 thnaks@j `ey
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2021-07-05 09:58:42 cehteh and hit share there when you want to share it haha :D
2021-07-05 10:00:14 bertptrs (and don't @ people on IRC)
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2021-07-05 10:01:10 Guest37 yes but the problem is i have a external file with actual code in it how can i create another file in rust playground and then call that from main ?
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2021-07-05 10:01:48 lambda just put it all in there, surrounded by a `mod xyz {}` scope if necessary
2021-07-05 10:01:48 cehteh no
2021-07-05 10:02:00 Guest37 because you wouldnt be able to see the output
2021-07-05 10:02:12 Lumpio- You can paste the output too
2021-07-05 10:02:22 j`ey well it's no worse than pasting it into irc directly :P
2021-07-05 10:02:42 Guest37 ok wait
2021-07-05 10:03:17 cehteh most importantly: whats your problem?
2021-07-05 10:04:22 Guest37 this is the link to my actual code file :https://play.rust-lang.org/?version=stable&mode=debug&edition=2018&gist=d9bedc6b45ec22420cf9752ae02b0d49
2021-07-05 10:04:49 Lumpio- You already pasted that here, and you still haven't pasted the error message
2021-07-05 10:04:56 Guest37 this is link to main file containing main function:https://play.rust-lang.org/?version=stable&mode=debug&edition=2018&gist=8b73ac37ca143f3af28935f0e57016b8
2021-07-05 10:05:03 Guest37 wait
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2021-07-05 10:05:09 jbg (we're not psychic, so we don't know *why* you're showing us all this code!)
2021-07-05 10:05:18 Lumpio- There might not even be an error
2021-07-05 10:05:25 Guest37 well i dont get any output
2021-07-05 10:05:25 Lumpio- You never use the future returned by your web::request
2021-07-05 10:05:36 Lumpio- Rust futures are inert unless polled
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2021-07-05 10:05:45 jbg request().await
2021-07-05 10:05:48 Lumpio- You need to choose a runtime too
2021-07-05 10:06:00 jbg it's not like javascript with a magical implicit runtime that polls every future that ever gets made
2021-07-05 10:06:22 Lumpio- The compiler should've given you a warning about this when you compile
2021-07-05 10:06:51 Guest37 well i m new to rust ,just learning it so i have no idea about these
2021-07-05 10:07:14 Lumpio- tokio is one popular async runtime
2021-07-05 10:07:52 Lumpio- https://rust-lang-nursery.github.io/rust-cookbook/web/clients/requests.html#async here's how to use tokio (mainly look at tokio::main)
2021-07-05 10:08:57 Guest37 alright thanks i will look at it
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2021-07-05 10:58:27 j`ey anyone get a better idea? https://play.rust-lang.org/?version=stable&mode=debug&edition=2018&gist=ecc88f6d67ad0286f4413d4862e36416 https://stackoverflow.com/questions/60074639/swapping-two-entries-of-a-hashmap
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2021-07-05 11:10:13 danieldg j`ey: looks about as good as it gets. ptr::swap is OK with a == b.
2021-07-05 11:11:04 j`ey i suggested just removing and re-inserting, theyre going with that, since it requires no unsafe
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2021-07-05 11:17:57 danieldg a general multi-get-mut on hashmap might be interesting, especially if via the entry API
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2021-07-05 11:48:06 Yruama hello
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2021-07-05 11:53:25 Yruama i'd like to know how you handle post build action ? i tried the xtask method, but i quickly ended by writing a lot of code
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2021-07-05 11:56:02 Ellipsis753 Hi. Rocket has macros like #[get("/")]. How do these work internally? You'd think they might append to a list of routes, but I don't know how this is done outside of a function at compile time? (I tried looking at the Rocket source, but it was beyond me)
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2021-07-05 11:56:37 SergioB You can watch my RustConf talk on Rocket where I explain exactly how this works.
2021-07-05 11:56:41 danieldg I think there's a cargo-expand, try that
2021-07-05 11:57:44 SergioB Cargo expand is a fairly poor teaching tool.
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2021-07-05 11:58:28 SergioB Ellipsis753: https://youtube.com/watch?v=t_FUZ34ahBE
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2021-07-05 12:02:15 Ellipsis753 Ok. I'll take a look at the talk and cargo expand. Thanks.
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2021-07-05 12:17:35 Ellipsis753 Watched the talk. Very interesting. Thank you.
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2021-07-05 12:31:31 safinaskar https://doc.rust-lang.org/std/index.html lists keywords
2021-07-05 12:31:41 safinaskar so, keywords are defined by "std" crate?
2021-07-05 12:31:50 safinaskar so i can define my own keywords in my crate?!
2021-07-05 12:32:34 GreenJello I think it's just convenient to document them here
2021-07-05 12:32:51 GreenJello you can't define your own keywords
2021-07-05 12:33:01 GreenJello and they're not part of std
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2021-07-05 12:33:36 safinaskar GreenJello: thanks
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2021-07-05 13:03:54 kupi if I .get(index) a value from a Vec<i32> the pointer inside the option points to the heap?
2021-07-05 13:04:30 j`ey yeah
2021-07-05 13:04:51 j`ey although we say reference, rather than pointer
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2021-07-05 13:11:53 safinaskar how to compare references for equality?
2021-07-05 13:13:53 hotcoffee safinaskar: would you need that, if they are owned? You want to compare the reference or the value it points to?
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2021-07-05 13:14:59 GreenJello there's std::ptr::eq which works for most references
2021-07-05 13:15:33 GreenJello but you have to be pretty careful to not pass it a reference to a reference or whatever
2021-07-05 13:18:20 safinaskar hotcoffee: GreenJello: thanks
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2021-07-05 13:22:15 safinaskar is there a way to quickly find documentation for combination "type + method name"?
2021-07-05 13:22:32 safinaskar for example, i am trying to find docs for "iter" method of array
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2021-07-05 13:22:55 safinaskar this should work for all methods, both intristic methods and methods from generic traits
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2021-07-05 13:29:50 j`ey I dont think there is
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2021-07-05 13:35:12 safinaskar ok
2021-07-05 13:35:44 safinaskar how to create HashMap from static data?
2021-07-05 13:36:03 safinaskar docs show this way: [("a", 0), ("b", 1)].iter().cloned().collect()
2021-07-05 13:36:06 safinaskar is there shorter way?
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2021-07-05 13:40:55 j`ey not really
2021-07-05 13:41:06 j`ey there's a crate clled map-lit that has a macro for it
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2021-07-05 13:48:28 safinaskar j`ey: thanks
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2021-07-05 13:51:56 SergioB Lots of crates have a map! macro of sorts, if you want sugar.
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2021-07-05 13:52:51 safinaskar i installed rustc using rustup. My OS is debian stretch. How to compile source using rust 2021?
2021-07-05 13:53:02 safinaskar preferably without creating config
2021-07-05 13:53:09 safinaskar i. e. simply by calling rustc from command line
2021-07-05 13:53:34 safinaskar i tried "rustc --edition 2021", but i got message "error: the crate requires edition 2021, but the latest edition supported by this Rust version is 2018"
2021-07-05 13:53:44 j`ey safinaskar: there is no 2021 edition yet
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2021-07-05 13:55:40 kupi https://gist.github.com/theqp/51e48dd87ef97901807cd5f3440d0c9b
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2021-07-05 13:55:57 kupi am I doing too many copies and dereferences, or is this fine?
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2021-07-05 13:58:46 SpaceManiac kupi: if you work entirely with references than the cloning is unnecessary
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2021-07-05 14:01:48 kupi SpaceManiac: I want to make a generic implementation in functional style
2021-07-05 14:02:43 SpaceManiac it only becomes more generic by removing the T:Clone bound: https://play.rust-lang.org/?version=stable&mode=debug&edition=2018&gist=1bf20f25255d665d5c376da8a3488e59
2021-07-05 14:04:13 kupi SpaceManiac: [T] means array for which the size is known at compile time?
2021-07-05 14:04:45 SpaceManiac it's a slice: https://doc.rust-lang.org/std/primitive.slice.html
2021-07-05 14:04:54 SpaceManiac &Vec<T> coerces to &[T]
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2021-07-05 14:07:37 bertptrs it's sice is explicitly unknown
2021-07-05 14:07:43 bertptrs (at compile time)
2021-07-05 14:07:50 bertptrs size dang it
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2021-07-05 14:11:15 kupi type of T in .iter() is &T, doesn't that mean it's an iterator of references?
2021-07-05 14:11:29 bertptrs The iterator yields references, correct
2021-07-05 14:11:59 safinaskar j`ey: ok
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2021-07-05 14:12:24 j`ey why dont they just leave their client open :P
2021-07-05 14:12:34 bertptrs .iter() does not consume the underlying thing (into_iterator does) so it can't hand you a copy unless the thing is Copy
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2021-07-05 14:13:23 kupi if that's the case why does `vec![1.clone(), 1.clone()]).iter().counts()` return `{1: 2}`?
2021-07-05 14:13:36 kupi the references are unique due to clone or not?
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2021-07-05 14:14:08 bertptrs references don't use pointer comparisons but value comparisons
2021-07-05 14:15:32 j`ey kupi: why the clones there?
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2021-07-05 14:15:42 bertptrs kupi: https://doc.rust-lang.org/std/primitive.reference.html
2021-07-05 14:15:50 kupi j`ey: because I wanted a T iterator
2021-07-05 14:16:06 bertptrs then use into_iterator
2021-07-05 14:16:17 j`ey kupi: but that's cloning the 1..
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2021-07-05 14:17:41 Alexendoo kupi: &1 will debug print as 1, it's still a HashMap<&T, usize>
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2021-07-05 14:18:10 Alexendoo also yeah when you clone 1 you just get the same 1, it doesn't do anything in that example
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2021-07-05 14:31:17 kupi so &a == &b deferenced both a and b, but what about &&a == &&b?
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2021-07-05 14:42:21 timemage kupi, probably what you need is the search term "deref coercion"
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2021-07-05 14:49:29 safinaskar it seems for me that Rust uses haskell-style Hindley-Milner type inference combined with small amount of subtyping (i mean deref coercions). is there some article on this?
2021-07-05 14:49:44 safinaskar why we got this mix?
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2021-07-05 15:30:08 kee safinaskar: Because deref coercions are useful.
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2021-07-05 15:48:43 mg Hi! I have a (type that contains a) Vec of `struct Foo { x: u32, bar: Bar }`s, sorted by the `x` value. Let's say it looks like `vec![Foo { x: 2, .. }, Foo { x: 5, .. }, Foo { x: 6 }]`. I want to create an Iterator over this vec that fills in missing x values with a placeholder bar. In other words it should yield `Foo { x: 2, .. }, Foo { x: 3, bar: placeholder_bar }, Foo { x: 4, bar:
2021-07-05 15:48:45 mg placeholder_bar }, Foo { x: 5, .. }, ..`. Is there a pattern or method in std or something that makes this easy?
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2021-07-05 15:50:38 lambda mg: it would yield `foo`s with x from 2 to 6 in this example?
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2021-07-05 15:50:57 mg yes, ideally bounded by the min and max value in the vec
2021-07-05 15:51:07 safinaskar is it true that any type can be moved
2021-07-05 15:51:08 safinaskar ?
2021-07-05 15:51:16 safinaskar i. e. is "let x = y" legal for any type?
2021-07-05 15:51:54 mg lambda: in reality you'd provide a "delta" or something that you add to an accumulator, I guess, defining the steps
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2021-07-05 15:53:43 georgemp is there a way to set +nightly for a single shell session (or something to that effect which is not a global change)?
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2021-07-05 15:55:11 j`ey georgemp: alias cargo='cargo +nighlty' :P
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2021-07-05 15:58:08 georgemp j`ey: didn't think of that, but, unfortunately doesn't help in my case :( i need to run cbindgen on nightly to generate my c header. What currently works is if i do `rustup default nightly` before running cbindgen. was wondering if there was a way to do the same without making the change globally on my system
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2021-07-05 15:58:50 lambda georgemp: there's `rustup override` for per-directory toolchain selection if that helps
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2021-07-05 16:00:45 georgemp lambda: that works. i guess i can set the override in my CI script right before and after running cbindgen..thanks :)
2021-07-05 16:02:17 lambda georgemp: oh, maybe `rustup run` is what you actually want then?
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2021-07-05 16:04:03 georgemp lambda: that's perfect..thank you :)
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2021-07-05 16:17:37 kee Does a closure produce comparable code to a custom struct with a FnMut implementation?
2021-07-05 16:17:46 kee Or is it slower somehow, because of syntactic sugar?
2021-07-05 16:18:37 j`ey im pretty sure it just generates struct + FnMut
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2021-07-05 16:23:25 cehteh may even inline and optmize away in some smart way
2021-07-05 16:23:31 kee Excellent. So a closure can actually be more efficient than the equivalent safe code.
2021-07-05 16:23:45 cehteh closures are safe code
2021-07-05 16:24:01 kee I meant the equivalent struct + FnMut implementation in safe code.
2021-07-05 16:24:32 cehteh prolly not more efficient, because thats pretty much the same with the same optimization opportinities, but cleaner for sure
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2021-07-05 16:30:33 ThinkT510 this looks interesting: https://github.com/theseus-os/Theseus
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2021-07-05 18:07:20 georgemp :q
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2021-07-05 18:55:40 pbit eval: "test"
2021-07-05 18:55:42 -- Notice(eval): "test"
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2021-07-05 18:56:48 meltyness evalr2: let 5 = 5
2021-07-05 18:56:50 -- Notice(evalr2): meltyness: error: expected `;`, found `}` ...
2021-07-05 18:56:51 -- Notice(evalr2): meltyness: https://play.rust-lang.org/?version=stable&mode=debug&edition=2018&gist=86f5f5a9d904a7e8e38a8e7da582199f
2021-07-05 18:57:43 --> TheAceOfHearts (~TheAceOfH@24.41.239.76) has joined ##rust
2021-07-05 18:57:54 j`ey evalr2: let 5 = 5;
2021-07-05 18:57:56 -- Notice(evalr2): j`ey: error[E0005]: refutable pattern in local binding: `i32::MIN..=4_ ...
2021-07-05 18:57:57 -- Notice(evalr2): j`ey: https://play.rust-lang.org/?version=stable&mode=debug&edition=2018&gist=9f9971b327a7f550b7e0eec384957e5e
2021-07-05 18:58:11 j`ey thats a funny error
2021-07-05 18:58:36 pbit that's a refutable error
2021-07-05 18:58:40 pbit :P
2021-07-05 18:59:03 meltyness https://doc.rust-lang.org/book/ch18-02-refutability.html?highlight=refuta#refutability-whether-a-pattern-might-fail-to-match
2021-07-05 18:59:54 meltyness evalr2: let there = "light";
2021-07-05 18:59:58 -- Notice(evalr2): meltyness: ()
2021-07-05 19:00:32 j`ey meltyness: noo
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2021-07-05 19:00:45 j`ey evalr2: let there = b"light";
2021-07-05 19:00:48 -- Notice(evalr2): j`ey: ()
2021-07-05 19:00:55 meltyness lol
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2021-07-05 19:03:39 -- pbit is now known as panicbit
2021-07-05 19:03:45 panicbit hey edcragg! :D
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2021-07-05 19:05:13 panicbit eval: --allocs vec![1, 2, 3]
2021-07-05 19:05:16 -- Notice(eval): #allocs 1 (12 bytes) :: #deallocs 1 (12 bytes) :: #lost: 0 (0 bytes)
2021-07-05 19:05:19 j`ey :O
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2021-07-05 19:05:49 -- thing_ is now known as thing
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2021-07-05 19:06:14 j`ey panicbit: is evalr2 your one? or is that Arnavion's sed version
2021-07-05 19:06:29 panicbit evalr2 is Arnavion's
2021-07-05 19:06:37 panicbit eval is mine
2021-07-05 19:06:37 j`ey competing bots!
2021-07-05 19:07:02 panicbit (some people might still know it from moznet)
2021-07-05 19:07:23 j`ey since you werent around, we didnt know what was happening with the bot
2021-07-05 19:07:27 panicbit it's probably a bit more fancy than the script version
2021-07-05 19:07:54 panicbit welp, there's always github issues to contact me '=D
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2021-07-05 19:09:22 panicbit ?crate itertools
2021-07-05 19:09:22 -- Notice(eval): itertools (0.10.1) - Extra iterator adaptors, iterator methods, free functions, and macros. -> https://crates.io/crates/itertools [https://docs.rs/crate/itertools]
2021-07-05 19:09:35 panicbit the important stuff seems to be working still
2021-07-05 19:09:41 j`ey great!
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2021-07-05 19:09:55 meltyness evalr2: println!("evalr: println!("evalr2: println!("lol");););
2021-07-05 19:10:00 -- Notice(evalr2): meltyness: error: unexpected closing delimiter: `)` ...
2021-07-05 19:10:00 -- Notice(evalr2): meltyness: https://play.rust-lang.org/?version=stable&mode=debug&edition=2018&gist=a64cbc0c1e77521d277d6a48203ea5c1
2021-07-05 19:10:11 panicbit that's way too often the first thing that people try lol
2021-07-05 19:10:24 danieldg outputs are notices, bots should only respond to privmsgs
2021-07-05 19:10:36 --> panicbit[m] (~panicbitm@2001:470:69fc:105::9294) has joined ##rust
2021-07-05 19:10:36 panicbit[m] eval: "another test"
2021-07-05 19:10:36 panicbit[m] good day fellow rustaceans o/
2021-07-05 19:10:36 panicbit[m] eval: 42
2021-07-05 19:10:36 panicbit[m] evalr2: 42
2021-07-05 19:10:39 -- Notice(evalr2): panicbit[m]: 42
2021-07-05 19:10:40 -- Notice(eval): "another test"
2021-07-05 19:10:42 -- Notice(eval): 42
2021-07-05 19:11:01 panicbit eval: --raw fn main() { println!("evalr2: 42"); }
2021-07-05 19:11:03 -- Notice(eval): error: expected one of `!`, `.`, `::`, `;`, `?`, `{`, `}`, or an operator, found keyword `fn`
2021-07-05 19:11:04 -- Notice(eval): ~~~ Full output: https://play.rust-lang.org/?gist=1842ea76ce0d5d41cbc1bedc1a64f2f4&version=stable&mode=debug
2021-07-05 19:11:18 panicbit eval: --bare fn main() { println!("evalr2: 42"); }
2021-07-05 19:11:21 -- Notice(eval): evalr2: 42
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2021-07-05 19:12:14 panicbit oh wow... my matrix messages just popped in. I send those minutes ago...
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2021-07-05 19:20:15 meltyness evalr2: use std::process::Command;fn main() {let x = Command::new("sh").arg("-c").arg("uname -a").output().expect("").stdout;println!("{:?}", String::from_utf8(x));}
2021-07-05 19:20:18 -- Notice(evalr2): meltyness: ()
2021-07-05 19:20:31 meltyness evalr: use std::process::Command;fn main() {let x = Command::new("sh").arg("-c").arg("uname -a").output().expect("").stdout;println!("{:?}", String::from_utf8(x));}
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2021-07-05 19:20:45 meltyness hmm
2021-07-05 19:21:30 Arnavion They both paste to the playground. You're not going to see any difference
2021-07-05 19:21:37 panicbit yeh
2021-07-05 19:22:14 j`ey and they already wrap the code in a main function
2021-07-05 19:22:21 <-- evalr2 (arnavion@user/arnavion) has quit (Remote host closed the connection)
2021-07-05 19:22:25 j`ey which is why there was no output
2021-07-05 19:22:36 meltyness hmm
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2021-07-05 19:23:07 panicbit Open the crustacean bay doors eval!
2021-07-05 19:23:07 -- Notice(eval): I'm sorry panicbit, I'm afraid I can't do that.
2021-07-05 19:23:16 meltyness evalr2: use std::process::Command;let x = Command::new("sh").arg("-c").arg("uname -a").output().expect("").stdout;println!("{:?}", String::from_utf8(x));
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2021-07-05 19:23:34 meltyness eval: use std::process::Command;let x = Command::new("sh").arg("-c").arg("uname -a").output().expect("").stdout;println!("{:?}", String::from_utf8(x));
2021-07-05 19:23:38 -- Notice(eval): Ok("Linux 09a7d39b2821 5.4.0-1051-aws #53~18.04.1-Ubuntu SMP Fri Jun 18 14:53:38 UTC 2021 x86_64 x86_64 x86_64 GNU/Linux\n")
2021-07-05 19:23:38 -- Notice(eval): ()
2021-07-05 19:23:42 meltyness haHAAA!
2021-07-05 19:24:21 meltyness It's a Linux system -- i KNOW this!
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2021-07-05 19:28:34 amvc OMG
2021-07-05 19:29:08 panicbit Anyway, gotta run. If the bot is making trouble or stops working, you can reach out to be via an issue on https://github.com/panicbit/playbot_ng or on matrix via @panicbit:matrix.org
2021-07-05 19:29:17 panicbit to me*
2021-07-05 19:29:46 panicbit (or if the irc bridge ain't broken, panicbit[m] should work too :P)
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2021-07-05 20:04:44 ec Is there a one-liner to convert a vec of H160 into a vec of strings using the LowerHex trait?
2021-07-05 20:04:55 ec Not sure what the idiomatic way to approach this is
2021-07-05 20:05:24 panicbit[m] H160?
2021-07-05 20:05:55 ec https://docs.rs/primitive-types/0.10.1/i686-unknown-linux-gnu/primitive_types/struct.H160.html
2021-07-05 20:07:08 panicbit[m] Iirc there isn't a super convenient way to do so with only std
2021-07-05 20:07:55 ec Can always just map
2021-07-05 20:08:05 ec Was hoping for something a tad more elegant
2021-07-05 20:08:29 meltyness hmm
2021-07-05 20:08:45 panicbit[m] eval: format!("{:02x}", vec![127, 42])
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2021-07-05 20:09:14 panicbit[m] evalr2: format!("{:02x}", vec![127, 42])
2021-07-05 20:09:47 panicbit[m] looks like the bridges is dead again :sadredpanda:
2021-07-05 20:10:07 ec :'(
2021-07-05 20:11:39 Arnavion No, I disconnected it
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2021-07-05 20:14:24 panicbit[m] Anyway, I wonder what good reason there is not to implement ToLowerHex for Vec<u8> (et al)
2021-07-05 20:14:49 Arnavion Actually, your bot is indeed not responding either
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2021-07-05 20:16:26 panicbit[m] is it joined still?
2021-07-05 20:16:49 panicbit[m] (can't easily check with matrix)
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2021-07-05 20:17:44 Arnavion Yes, it's in the channel, but it didn't respond to you earlier message, nor is it responding to my direct privmsgs
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2021-07-05 20:18:01 panicbit[m] earlier I observed eval getting a connection timeout in the channel, but the bot itself never noticed (which is unusual)
2021-07-05 20:18:20 panicbit[m] Also, a lot of people seem to be getting ping timeouts
2021-07-05 20:18:25 Arnavion Do you have it sending pings to the server?
2021-07-05 20:18:33 panicbit[m] so probably the network being very wonky still
2021-07-05 20:18:50 Arnavion Otherwise it's not going to notice an idle TCP connection (mine has the same problem but I CBA to impl the fix in awk)
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2021-07-05 20:50:37 meltyness boy i'm super interested in redox, has anyone run it any?
2021-07-05 20:50:57 meltyness that's actually why i set out to spend the last 3 weeks learning rust
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2021-07-05 21:48:58 sklv i was going to until i learnt it had some relatively severe memory safety issue to do with page access
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2021-07-05 22:07:15 meltyness oh? hm
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2021-07-05 22:09:33 gggp what is the object memory model like in rust
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2021-07-06 00:32:17 ac5tin does making my struct derive Debug affect performance ?
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2021-07-06 00:33:29 danieldg no, impls that are not used are not present in the binary
2021-07-06 00:34:26 ac5tin so isn't it better if i just derive Debug for all my structs?
2021-07-06 00:35:47 danieldg yep
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2021-07-06 00:37:44 ac5tin clear
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2021-07-06 00:38:08 cehteh .. next question would be "why isnt that default in debug builds :D
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2021-07-06 00:38:57 danieldg because there's no good way to have an auto impl of Debug and also let you do it manually
2021-07-06 00:39:38 cehteh ... and you dont want to expose internals on all debug builds
2021-07-06 00:41:15 danieldg there is a missing-debug-impls lint
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2021-07-06 00:43:04 danieldg debug build and debug impl are mostly unrelated anyway
2021-07-06 00:43:31 cehteh yep
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2021-07-06 02:01:33 printf hi, is there a way i can get the current date in chrono::NaiveDate form?
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2021-07-06 02:13:04 trev printf can you do let today = Utc::today() then today.naive_utc() ?
2021-07-06 02:13:16 trev or you can use Local instead of Utc
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2021-07-06 02:41:23 edcragg hey, panicbit[m] :)
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2021-07-06 02:48:43 panicbit[m] \o/
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2021-07-06 02:49:01 panicbit[m] you're the first familiar face I noticed around here
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2021-07-06 03:01:00 * rk4 wonders familiar from where
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2021-07-06 03:03:01 rk4 true facts: i find a mild annoyance with all the uses in our codebase of *T when T would have been fine [context: garbage collected language], i attribute this to learning rust
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2021-07-06 03:08:56 ThinkT510 informative notification: true fact: brought to you by the department of redundancy department
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2021-07-06 03:18:16 printf im trying to use diesel to query a table and one of the columns is a timestamptz, i want to do filter on that column, which type should i use? chrono::Date?
2021-07-06 03:18:39 printf chrono::NaiveDate and Date<Utc> dont seem to work
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2021-07-06 03:21:14 printf oh wait seems like i should use DateTime<Utc>
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2021-07-06 03:23:32 jbg timestamptz in postgres is DateTime<Utc> in chrono
2021-07-06 03:24:38 jbg well, assuming your postgres server is using UTC as timezone. (which it probably is; having it otherwise is mild insanity)
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2021-07-06 03:26:52 * bertptrs looks nervously at my employer
2021-07-06 03:27:27 bertptrs but the actual time zone doesn't matter, you can load any tz into DateTime<Utc> and it will convert as appropriate
2021-07-06 03:28:00 jbg is that a diesel thing? because I remember trying that once with rust-postgres and it didn't work
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2021-07-06 03:29:05 bertptrs I've only ever used diesel so I wouldn't know
2021-07-06 03:30:08 bertptrs it also doesn't make sense not to work; the tz is a property of the data and not the column nor the data, so it should be able to handle it
2021-07-06 03:30:26 bertptrs that second "data" should be "database"
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2021-07-06 03:31:07 jbg mm if it reads the timezone database property to know the conversion to make
2021-07-06 03:31:26 jbg doesn't that return an IANA TZ name though?
2021-07-06 03:31:41 jbg chrono doesn't have built-in tz defs, so diesel must depend on chrono-tz or something?
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2021-07-06 03:33:29 bertptrs Not sure. Regardless, timestamptz columns can contain entries with different. you need the client to handle that
2021-07-06 03:33:53 jbg no, they can't
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2021-07-06 03:34:13 bertptrs Yes they can? That's the point of that column, you store a timestamp with its timezone!
2021-07-06 03:34:16 jbg timestamptz is always stored in UTC, and stores no time zone data alongside the UTC timestamp. it's converted to the postgres server's TimeZone setting on display
2021-07-06 03:34:26 jbg this is a *very* common misconception about timestamptz, but it's a misconception
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2021-07-06 03:37:18 jbg so when diesel selects a timestamptz column, it gets a timestamp converted from the stored UTC value to the timezone that postgresql is configured to use. (as opposed to just the stored timestamp value with no conversion, which is what you'd get if selecting a timestamp column)
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2021-07-06 03:37:59 bertptrs Weird, that's very much not what I see in the docs. I'm looking this up because doing anything else would be useless. I can find that it's stored in UTC, but I'd expect it to be converted back on the way out
2021-07-06 03:38:27 jbg the docs are very clear about it
2021-07-06 03:38:38 bertptrs disagree as I have them right in front of my face
2021-07-06 03:38:42 jbg yes, it is converted - to the postgresql server's timezone
2021-07-06 03:38:49 jbg not to any stored timezone value, since there isn't one
2021-07-06 03:38:55 jbg if you think the docs say otherwise, you're not reading them accurately
2021-07-06 03:38:59 jbg I have worked on the code that implements this :)
2021-07-06 03:39:13 bertptrs It's not that I see that, it's that I don't see any specific claim one way or another
2021-07-06 03:39:17 jbg the entire point of timestamptz is the conversions on input and output
2021-07-06 03:39:30 jbg apart from anything else, both timestamp and timestamptz are 8 bytes
2021-07-06 03:39:32 bertptrs (but I do see like 5 different ways of specifying the timezone for literals. priorities, people)
2021-07-06 03:39:54 jbg the documentation also makes the conversions very clear:
2021-07-06 03:40:10 jbg input: "For timestamp with time zone, the internally stored value is always in UTC (Universal Coordinated Time, traditionally known as Greenwich Mean Time, GMT). An input value that has an explicit time zone specified is converted to UTC using the appropriate offset for that time zone. If no time zone is stated in the input string, then it is assumed to be in the time zone indicated by the system's TimeZone parameter"
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2021-07-06 03:40:21 jbg output: "When a timestamp with time zone value is output, it is always converted from UTC to the current timezone zone, and displayed as local time in that zone. To see the time in another time zone, either change timezone or use the AT TIME ZONE construct"
2021-07-06 03:41:49 jbg "timezone" in that context is referring to the system parameter "timezone"
2021-07-06 03:42:08 bertptrs apart from anything else, both timestamp and timestamptz are 8 bytes < that doesn't say anything, you could use one byte for the tz and be fine. It's only when you compute the actual range that you figure that out, but who can do that in their head
2021-07-06 03:42:38 jbg the table at the top of the page also calls out the lowest possible value and highest possible value, which are also identical
2021-07-06 03:42:53 jbg so unless timestamp doesn't use 1 bit, it's a strong clue
2021-07-06 03:43:06 jbg anyway, I think a careful reading of the docs (especially the parts above) makes this very clear
2021-07-06 03:43:17 bertptrs it's not, that's how I would implement it, just ignore the bits for the tz if the spec did not ask for it
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2021-07-06 03:43:50 jbg there's really no difference between timestamp and timestamptz if your postgresql server is configured to use UTC. but timestamptz is more convenient in the presence of ORMs because it usually maps to a UTC-aware datetime type whereas timestamp usually maps to a naive one
2021-07-06 03:44:12 jbg timestamptz also allows you to pass non-UTC timestamps directly to the DB and have it handle the conversion, which can be convenient sometimes
2021-07-06 03:44:20 jbg but in terms of storage they're identical
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2021-07-06 03:45:33 jbg and it's not possible to recover the timezone that data was inserted with unless you separately store it. this can be an issue in certain use cases related to calendaring
2021-07-06 03:46:15 bertptrs TIL I guess. Don't agree with the decision to do it this way for the reason above but it is what it is
2021-07-06 03:46:25 bertptrs Also those docs need serious improvement
2021-07-06 03:46:50 bertptrs The "this doesn't store timestamps stop thinking it does" thing deserves a highlight
2021-07-06 03:46:59 bertptrs s/timestamps/time zones/
2021-07-06 03:47:01 jbg honestly I think the docs are excellent, along with basically all the postgres docs. but they are dense and require careful reading
2021-07-06 03:47:11 jbg and yeah, this is a common enough misconception that it should be highlighted, you're right
2021-07-06 03:48:04 bertptrs but they are dense and require careful reading < exactly why I think they are not great. and my job entails reading a lot of them, so you'd think I would be used to it. I'm clearly not
2021-07-06 03:48:28 printf another thing about diesel, can i put any struct into a column with the PG Type of JSON
2021-07-06 03:48:31 bertptrs the more niche use cases in particular are worded in a way that probably makes a lot of sense to whoever wrote the code, but not to an end user
2021-07-06 03:49:19 printf on of the columns in my database is JSON, do i have to map it as serde::Value or HashMap first or can i just put a struct in
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2021-07-06 03:49:58 printf also it's actually an array json, so can i put something like: pub data: Vec<mystruct>,
2021-07-06 03:50:40 bertptrs from what I read, you should use a serde_json::Value first: https://docs.rs/diesel/1.4.7/diesel/pg/types/sql_types/struct.Jsonb.html
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2021-07-06 03:51:44 jbg rust-postgres has a wrapper where you can do Json(my_struct_value) if your struct impls Serialize (for inserting/updating) and/or Deserialize (for selecting), maybe diesel has something similar?
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2021-07-06 03:54:24 bertptrs no other FromSql implementations for jsonb but you could easily implement something like that yourself
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2021-07-06 03:55:09 printf oh and im using jsonb not json actually
2021-07-06 03:55:23 jbg doesn't change much in terms of from/to sql
2021-07-06 03:55:31 jbg you could just wrap the existing impl that uses Value and provide one for your type
2021-07-06 03:56:43 bertptrs The impls are very straightforward: https://docs.rs/diesel/1.4.7/src/diesel/pg/types/json.rs.html#39-56
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2021-07-06 03:58:58 bertptrs I imagine rust-posgres' Json wrapper does something similar
2021-07-06 04:00:21 printf srry , so i either have to map my field as serde::Value so like: pub data: Value, and then i manually deserialise it later back to mystruct, or i need to impl FromSql and ToSql for mystruct?
2021-07-06 04:00:34 jbg either
2021-07-06 04:00:39 jbg you don't have to manually deserialise though
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2021-07-06 04:01:57 printf im not quite sure how to do the impl FromSql and ToSql thing though, do i just copy it from the link u sent just now?
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2021-07-06 04:03:16 jbg you could do that and then adjust it accordingly, yeah
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2021-07-06 04:19:40 printf so ,impl FromSql<sql_types::Jsonb, Pg> for MyStruct
2021-07-06 04:20:03 printf and then for my table struct i can do struct MyTable { pub data: Vec<MyStruct> }
2021-07-06 04:20:24 printf does it work for Vecs too
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2021-07-06 04:23:15 jbg that would be for a postgres array of jsonb
2021-07-06 04:23:29 jbg if you want the array to be inside the jsonb, you want to impl FromSql for Vec<MyStruct>
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2021-07-06 04:23:49 jbg that might conflict with an existing impl though
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2021-07-06 04:24:09 jbg since I guess diesel already supports postgres arrays that way
2021-07-06 04:24:11 jbg so you might have to do a newtype
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2021-07-06 04:25:30 jbg oh, it should be fine as long as you don't also impl FromSql for MyStruct I think
2021-07-06 04:25:37 printf cuz in my database table, ive defined the column type to be JSONB, but the actual JSON data is array
2021-07-06 04:25:41 jbg because diesel only implements it for Vec<T> where T: FromSql
2021-07-06 04:25:50 jbg yeah, so you need to impl FromSql for Vec<MyStruct>
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2021-07-06 04:26:21 printf do i need to impl for MyStruct first and then Vec<MyStruct> or just Vec<MyStruct> would suffice
2021-07-06 04:27:23 jbg you don't need to impl FromSql for MyStruct, and if you do, it won't compile
2021-07-06 04:27:42 jbg because diesel's existing `impl FromSql for Vec<T> where T: FromSql` will then conflict with your `impl FromSql for Vec<MyStruct>`
2021-07-06 04:28:20 printf oh right,
2021-07-06 04:29:22 jbg (that existing implementation is for postgresql's array type, which is unrelated to json/jsonb)
2021-07-06 04:29:57 printf ok im trying to copy the from_sql impl but it's complaining an error about undeclared carete or module `deserialize`, im using rocket's serde and im not sure what's the path to deserialize
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2021-07-06 04:30:14 jbg you probably just want to add a dependency on serde
2021-07-06 04:30:36 jbg I assume "rocket's serde" is just serde
2021-07-06 04:31:10 printf ok i get it so if i impl FromSql for MyStruct it will try to do it's own version for Vec<MyStruct> thats why i shouldnt
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2021-07-06 04:33:14 printf yea rocket's serde is just normal serde
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2021-07-06 04:37:56 printf oh right, diesel::deserialze::Result
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2021-07-06 04:38:36 printf hmm, "only traits defined in the current crate can be implemented for arbitrary types, define and implement a trait or new type instead"
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2021-07-06 04:40:18 jbg what are you trying to implement FromSql for?
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2021-07-06 04:42:32 printf im trying to impl FromSql<Jsonb,Pg> for Vec<MyStruct>
2021-07-06 04:44:07 jbg and MyStruct is in the same crate as you're trying to write this impl?
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2021-07-06 04:45:04 mike-burns Is it too late to talk you out of a JSONB column type?
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2021-07-06 04:45:24 printf mike-burns yes unfortunately
2021-07-06 04:45:35 jbg unless you know more about his use case than I do, why try to talk him out of it? there are plenty of sensible reasons one might use JSONB
2021-07-06 04:45:52 jbg (there are plenty of non-sensible reasons too, but we don't know which is printf's case)
2021-07-06 04:46:14 printf MyStruct is in the same crate as where im writing the impl
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2021-07-06 04:47:41 jbg I don't know the orphan rules off by heart, but I thought impl Foreign<Foreign, Foreign> for Foreign<Local> should be fine but maybe it's only fine when the local type param appears in the trait rather than the type
2021-07-06 04:48:12 printf this is my file: https://paste.rs/mmo
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2021-07-06 04:55:35 printf so i cant imp this trait unless it's in the same crate as MyStruct?
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2021-07-06 05:11:11 jbg you can impl the trait for MyStruct, I guess the issue is that both the trait and Vec are outside your crate. I thought that was fine since Vec is parameterised with a local type, but maybe not (I don't have time to read the orphan rules in detail right now)
2021-07-06 05:11:18 jbg you're not by any chance using a really old version of rust are you?
2021-07-06 05:11:33 printf no, im using the nightly version
2021-07-06 05:11:36 jbg ok
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2021-07-06 05:11:51 jbg you can wrap Vec<MyStruct> in a newtype and impl for that
2021-07-06 05:12:14 printf so pub type NewType = Vec<MyStruct> ?
2021-07-06 05:12:27 printf and then impl .... for NewType { .... }
2021-07-06 05:13:58 j`ey printf: that's a type alias, not a new type
2021-07-06 05:14:07 j`ey you need: struct NewType(Vec<MyStruct>);
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2021-07-06 05:21:23 printf ok , so struct MyStructList(Vec<MyStruct);
2021-07-06 05:21:43 printf and then impl FromSql ... for MyStructList
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2021-07-06 05:25:58 printf yea i did that and got the error: the trait bound MyStructList Queryable<diesel::sql_types::Jsonb,Pg> is not satisfied required becuase of the requirements on the impl of Queryable<(disel::sql_types::Integer,diesel::sql_types::SmallInt,diesel::sql_types::Jsonb,diesel::sql_types::Timestamptz),Pg> for (i32,i16,MyStructList, chrono::DateTime<Utc>
2021-07-06 05:26:36 printf it also complained: 1 redundant requirements hidden
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2021-07-06 05:40:26 jbg I guess you need to derive Queryable for it, not sure, haven't really used diesel
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2021-07-06 05:51:37 printf yea i tried that, didnt work
2021-07-06 05:52:06 printf i give up, ill just map it as Value and then manually deserialise it using serde_json::from_value()
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2021-07-06 06:05:20 ooookiwi hello
2021-07-06 06:06:02 ooookiwi i'm trying to trace memory allocations made by rust, to understand a memory dump (know what piece of information is at which location)
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2021-07-06 06:08:25 ooookiwi i've been trying things like "valgrind --trace-children=yes --tool=massif ./target/debug/myprog", but massif does not print allocation nor it stores it in the massif.out file, like it does not see the allocations
2021-07-06 06:09:13 jbg first question would be: does myprog make heap allocations? :)
2021-07-06 06:09:32 ooookiwi i tried also gperftools like "LD_PRELOAD="/usr/lib64/libtcmalloc.so" HEAPPROFILE=/tmp/profile ./target/debug/myprog", but similarely the libtcmalloc does not seem to catch any allocations
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2021-07-06 06:10:58 jbg I've not used libtcmalloc with a rust program, personally, but it should work -- and massif definitely works fine
2021-07-06 06:11:00 ooookiwi legit question... well code is at https://github.com/looran/tshat and yes it does all sorts of allocations
2021-07-06 06:11:57 ooookiwi well i believe it should work, i must be doing something wrong but i didn't figure what quite yet :)
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2021-07-06 06:16:19 jbg I assume you're not using some ancient rust that still uses jemalloc instead of the system allocator?
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2021-07-06 06:19:31 ooookiwi jbg: does not seem so "rustc 1.53.0-nightly"
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2021-07-06 06:44:11 ooookiwi actually it works with massif, i can see some allocations now that i use options to make it log more (--detailed-freq=1 --max-snapshots=1000), but it seems using tokio make the traces totally unreadable, almost all allocs are logged under tokio::runtime::Runtime
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2021-07-06 06:46:13 jbg doesn't seem surprising; without any knowledge of how rust async works the profiler is going to see them happening inside the poll function of the futures, called by the runtime
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2021-07-06 07:20:54 printf jbg isnt it faster to use jemallocator vs the default one?
2021-07-06 07:21:36 j`ey printf: not universally, and it makes programs bigger, thats why it was removed as the default
2021-07-06 07:22:39 printf i read using jemalloc/mimalloc is faster thought
2021-07-06 07:22:42 printf though*
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2021-07-06 07:23:13 printf but i guess thats only true if you have lots of heap allocation?
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2021-07-06 07:32:49 jbg it might be faster, you would have to measure for your actual workload
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2021-07-06 07:40:34 bertptrs IIRC it's faster with lots of tiny threaded allocations, and even then the results weren't that much better
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2021-07-06 07:46:35 db48x the primary reason that Firefox started using jemalloc was that it decreased the overall memory fragmentation after loading and unloading a bunch of tabs
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2021-07-06 09:23:55 kupi hi, do i understand correctly what's happening here? and all references point to the heap here? https://gist.github.com/theqp/e76dd096d762943f5e2f8654338f516c
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2021-07-06 09:25:08 j`ey well th4 &Vec<T> isn't a reference to the heap
2021-07-06 09:26:06 kupi besides that, all of them?
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2021-07-06 09:26:20 j`ey yeah, since theyre references to the Vec<T> items
2021-07-06 09:27:27 kupi in the hashmap why the keys are &T?
2021-07-06 09:28:12 kupi i got it: because the iterators contain &T-s
2021-07-06 09:28:36 lambda yeah, getting Ts would require cloning the Vec elements
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2021-07-06 09:30:56 lambda kupi: you can into_iter() the hashmap to get rid of one level of references
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2021-07-06 09:32:16 j`ey the second iter, that is
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2021-07-06 09:35:32 kupi thanks, updated it https://gist.github.com/theqp/da6e70c3d23fcd5e3cbce9e08c5640b7
2021-07-06 09:37:24 j`ey do you need the map at the end now?
2021-07-06 09:38:08 kupi no
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2021-07-06 09:39:00 Alexendoo Could use max_by_key there
2021-07-06 09:39:32 kupi Alexendoo: but i am comparing by value
2021-07-06 09:40:08 kupi > Returns the element that gives the maximum value from the specified function.
2021-07-06 09:40:15 kupi then why it is named "by key"?
2021-07-06 09:42:16 bertptrs it uses a key value rather than the actual object to compare. python does it the same way, even calling the function "key"
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2021-07-06 09:47:17 Alexendoo I can certainly see how that'd be confusing when you're iterating over a hashmap
2021-07-06 09:47:44 kupi .max_by_key(|(_, count)| *count) ?
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2021-07-06 09:48:04 kupi thanks, now i see that max_by_key is in iter
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2021-07-06 09:49:25 Alexendoo Yeah that or |&(_, count)| count
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2021-07-06 09:53:55 kee How can I ask Rust to do fast floating point maths? (I don't care about accuracy.)
2021-07-06 09:54:50 kee There are nightly crates but I'm wondering if this is possible in stable.
2021-07-06 09:54:59 bertptrs it's not, not yet
2021-07-06 09:55:33 bertptrs I read an RFC that tried to implement this, but it's very new territory
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2021-07-06 09:56:00 kupi is there an alternative to counts which does not return a map? I don't need hashing in that context
2021-07-06 09:56:02 kee I'll just use the fast-floats crate then.
2021-07-06 09:56:23 kupi nvm, I just realized hashing is needed by the algorithm
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2021-07-06 09:57:40 Alexendoo kupi: You could do it with a BTreeMap which would be Ord instead
2021-07-06 09:57:51 bertptrs are your values grouped together? If so, you could use Itertools::group_by
2021-07-06 09:59:31 kee If I want a fixed-size ring buffer, does VecDeque have much overhead compared to using a Vec and an index variable?
2021-07-06 09:59:50 bertptrs not at all
2021-07-06 10:00:11 kupi bertptrs: what do you mean by grouped together?
2021-07-06 10:00:31 bertptrs all 1s together in sequence, then all 2s, 3s, etc
2021-07-06 10:00:32 kee kupi: Does it look like [1, 1, 1, 1, 2, 2, 4, 4, 4, 5, 5, 3, 3, 3, 0, 0]?
2021-07-06 10:00:39 kupi kee: no
2021-07-06 10:01:29 kee I don't know of anything that'd work, then, other than something with a map.
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2021-07-06 10:01:33 kee Unless you write it yourself.
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2021-07-06 10:02:09 kupi kee: it's possible which a Vec<(&T, usize)>, but it would be horribly slow
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2021-07-06 10:03:09 kee kupi: Your keys can't be mapped to adjacent integers, then.
2021-07-06 10:03:17 kee If they could, you'd just need a Vec<usize>.
2021-07-06 10:04:47 talin hello. i made a "telnet client" in rust, and it uses TcpStream with a non-blocking socket with a very low timeout. so this approach is basically constantly hammering on the socket in a busy-wait style. is there a better approach where i could get the OS to tell me when there is new data to be received?
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2021-07-06 10:27:10 kee talin: A blocking socket, a thread and a queue.
2021-07-06 10:27:25 kee I've never got that to work, so take it with a pinch of salt, but I don't see why it shouldn't.
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2021-07-06 10:37:50 talin kee: thank you. ages ago when i was dabbling with this, someone said i should use tokio, but i don't know
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2021-07-06 10:40:51 kee talin: Only if you like async.
2021-07-06 10:41:03 kee I prefer async-std, personally (via the smol crate).
2021-07-06 10:41:25 kee The tokio solution might be better, though; I vaguely remember that tokio has some decent async wrappers for sockets.
2021-07-06 10:41:55 elichai2 Why is the codegen of these not the same? https://godbolt.org/z/reMPrvf1P https://godbolt.org/z/GEWzY4d9h (also when I try to get IR output for the 2nd one I get a compilation error for some reason)
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2021-07-06 10:55:09 bertptrs good question. somehow the compiler doesn't realize that that the second one is still a no-op
2021-07-06 10:55:45 bertptrs "a sufficiently smart compiler" etc but this one clearly isn't
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2021-07-06 10:57:42 kee If I'm repeatedly dividing by the same number (where that number is determined at runtime), is there a way to convert that into arcane magic instructions as a sort of cache?
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2021-07-06 10:58:39 danieldg can you convert it into a multiply? Those are generally faster than a divide
2021-07-06 10:58:51 kee danieldg: Yeah, that's what I mean.
2021-07-06 10:59:02 kupi is there a shorthand for `MyEnum(value) => MyEnum(value)` in a pattern match?
2021-07-06 10:59:14 kee I could have a lookup table, I suppose, but that'd be a big lookup table.
2021-07-06 10:59:17 danieldg kee: you need to do that manually because it's likely to change the result
2021-07-06 10:59:28 bertptrs if you do it a lot, you can compute the MMI and use that instead
2021-07-06 10:59:30 kee kupi: x => x, but that doesn't check the variant.
2021-07-06 10:59:51 bertptrs computing the MMI is a bit of work so you need to be sure you're using one divisor a lot
2021-07-06 10:59:53 danieldg kupi: x @ MyEnum(_) => x
2021-07-06 11:00:28 kupi danieldg: thanks, i was looking for that
2021-07-06 11:00:31 kee bertptrs: Doesn't work for powers of two.
2021-07-06 11:00:33 bertptrs (also the MMI might not exist for a particular number)
2021-07-06 11:00:34 kee So MMI and shift?
2021-07-06 11:00:42 kupi * kee
2021-07-06 11:00:43 kupi XD
2021-07-06 11:00:56 kupi nvm
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2021-07-06 11:01:14 elichai2 bertptrs: yeah, zero cost abstractions isn't really zero cost in a lot of places like this
2021-07-06 11:01:28 bertptrs kee: is there anything you know about the divisors?
2021-07-06 11:01:32 elichai2 another Q, there's no `IntoExactSizeIterator` trait somehow, right?
2021-07-06 11:01:38 kee bertptrs: Not really.
2021-07-06 11:01:57 nox elichai2: No need to
2021-07-06 11:02:20 kee Actually, they're likely to be less than a dozen, so I should just use a lookup table.
2021-07-06 11:02:20 danieldg elichai2: not really, you can do IntoIterator where T::IntoIter : ExactSizeIterator
2021-07-06 11:02:39 elichai2 danieldg: Nice!
2021-07-06 11:02:42 elichai2 THanks :)
2021-07-06 11:02:45 bertptrs kee: you could try special-casing it a little, 2^n ⇒ shift, try compute MMI if it exists, just do it
2021-07-06 11:04:42 elichai2 danieldg: "error[E0658]: associated type bounds are unstable"
2021-07-06 11:05:36 danieldg kee: or maybe compute 2^32/b and use a_u32/b_u32 -> (a_u32 as u64 * bi_u32 as u64) >> 32
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2021-07-06 11:06:05 Karel kee, There's libdivide for C++ maybe there's a similar Rust crate as well.
2021-07-06 11:06:08 danieldg don't know when that becomes inaccurate though
2021-07-06 11:06:54 danieldg elichai2: there is a way to do that but maybe not in the context you are using it
2021-07-06 11:07:01 Karel There is and it's called fastdivide :)
2021-07-06 11:07:12 j`ey bertptrs: elichai2 this is freaky https://godbolt.org/z/TG6YMqa3r why does adding repr(C) cause it to generate way more code
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2021-07-06 11:07:49 elichai2 danieldg: My context is basically `pub fn func(_: impl IntoIterator<Item = (), IntoIter: ExactSizeIterator>) {}`
2021-07-06 11:08:10 danieldg elichai2: rewrite it as a generic function
2021-07-06 11:08:17 danieldg you need to name the type
2021-07-06 11:08:48 elichai2 yeah but if I name the type I lose the genericity of it
2021-07-06 11:08:52 danieldg no
2021-07-06 11:09:11 elichai2 j`ey: wtf
2021-07-06 11:09:12 danieldg fn func<T>(_:T) where T:IntoIterator...
2021-07-06 11:09:29 danieldg elichai2: then the where part actually works
2021-07-06 11:09:40 elichai2 danieldg: you mean this? https://play.rust-lang.org/?gist=86dbd97db1fdaba53b899e1d63198bec
2021-07-06 11:09:49 danieldg no
2021-07-06 11:09:51 elichai2 ohh if I name the other one too
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2021-07-06 11:10:11 danieldg where T::IntoIter :
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2021-07-06 11:11:05 elichai2 danieldg: nice! I thought I need to introduce another generic var
2021-07-06 11:11:18 danieldg no, that actually makes it harder
2021-07-06 11:11:26 elichai2 that's cool, too bad I need to make it explicitly generic but I guess it's not too bad
2021-07-06 11:11:35 elichai2 j`ey: i'll open a Zulip thread I guess
2021-07-06 11:11:38 cehteh j`ey: iirc repr(C) would also include all other C memory model constraints/gurantees, about ordering and stuff. or it might be just not optimized as well
2021-07-06 11:12:14 j`ey cehteh: well it changes the abi, it's just not obvious why that makes such a difference here
2021-07-06 11:12:22 j`ey elichai2: link it, i want to read it
2021-07-06 11:12:27 j`ey error: abi: Scalar(Scalar { value: Int(I64, false), valid_range: 0..=18446744073709551615 })
2021-07-06 11:12:30 j`ey error: abi: Aggregate { sized: true }
2021-07-06 11:12:36 j`ey first is rust abi, second is c abi
2021-07-06 11:13:00 kupi is there a function on Result which does this? `ok @ Ok(_) => ok, Err(e) => f(e)`
2021-07-06 11:13:04 j`ey (or transparent for the second.. whcih is weird)
2021-07-06 11:13:21 danieldg kupi: unwrap-or
2021-07-06 11:13:29 j`ey kupi: https://doc.rust-lang.org/std/result/enum.Result.html#method.map_err
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2021-07-06 11:14:26 j`ey (sorry, transparent gives the Scalar abi too)
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2021-07-06 11:16:07 j`ey elichai2: lol https://godbolt.org/z/ceo6MG5Mn
2021-07-06 11:16:24 j`ey changing usize -> Wrapper is more optimised than not changing the type at all
2021-07-06 11:16:42 kupi j`ey: in that op is `FnOnce(E) -> F`, mine it would be `FnOnce(E) -> Result<T, F>`
2021-07-06 11:16:52 elichai2 j`ey: wtf
2021-07-06 11:17:00 kupi danieldg: unwrap-or does not accept a functions which consumes the error
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2021-07-06 11:17:39 danieldg kupi: I meant or-else but didn't notice you wanted ok to ok
2021-07-06 11:17:50 bertptrs compilers are magic
2021-07-06 11:17:52 j`ey elichai2: cleaned up, https://godbolt.org/z/YPdPY8of1
2021-07-06 11:18:39 bertptrs Interesting, so it recognizes the struct initializer function but only the struct initializer function. Not even an identity function
2021-07-06 11:18:40 bertptrs wtf
2021-07-06 11:19:05 elichai2 j`ey: https://rust-lang.zulipchat.com/#narrow/stream/122651-general/topic/does.20Repr.28C.29.20on.20a.20single.20field.20struct.20hurts.20optimizations.3F
2021-07-06 11:19:09 j`ey elichai2: ty
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2021-07-06 11:19:23 elichai2 (couldn't find your username in Zulip)
2021-07-06 11:19:24 j`ey bertptrs: it needs more abstractions!!!
2021-07-06 11:19:56 bertptrs that's always the solution. even if the problem is too many abstractions
2021-07-06 11:20:24 elichai2 bertptrs: lol yeah, even explicitly the identity function haha https://godbolt.org/z/PoGY6a8M1
2021-07-06 11:21:44 bertptrs someone was very proud of optimizing this very edge case
2021-07-06 11:21:47 bertptrs but why
2021-07-06 11:23:12 elichai2 it seems to be optimized in the Rust side, not in LLVM
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2021-07-06 11:25:52 kupi what do you think of this? https://gist.github.com/theqp/b04357092b6faaf045586e2780537e32
2021-07-06 11:25:59 bertptrs kupi what's the difference between this and map_err
2021-07-06 11:26:18 kupi bertptrs: the type of the funcion is different
2021-07-06 11:26:32 j`ey kupi: https://doc.rust-lang.org/std/result/enum.Result.html#method.or_else
2021-07-06 11:26:33 kupi map_err does not allow "recovering"
2021-07-06 11:26:36 bertptrs ah, you're right. subtle change but I like it
2021-07-06 11:26:51 kupi j`ey: or_else does not consume the error
2021-07-06 11:27:24 kupi nvm i am dumb
2021-07-06 11:27:26 j`ey kupi: https://doc.rust-lang.org/src/core/result.rs.html#767
2021-07-06 11:27:30 j`ey it's exactly the same code!
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2021-07-06 11:30:53 kupi I confused or_else with or
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2021-07-06 12:02:18 j`ey bertptrs: https://github.com/rust-lang/rust/issues/79308
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2021-07-06 12:05:08 kupi ? is a syntax sugar for wrapping and_thens?
2021-07-06 12:05:51 j`ey ? is the Try trait
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2021-07-06 12:06:10 j`ey https://doc.rust-lang.org/std/ops/trait.Try.html
2021-07-06 12:09:07 kupi not will be? it says it's experimental
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2021-07-06 12:10:09 j`ey the trait is, but the syntax is stable
2021-07-06 12:10:22 j`ey its just exactly how it works that is unstable
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2021-07-06 12:27:11 Polochon_street hi! I'm trying to run clippy on a rather large codebase, and it spits out a lot of "implementing From is preferred" here https://github.com/zmwangx/rust-ffmpeg/blob/master/src/util/chroma/location.rs, for instance
2021-07-06 12:27:35 Polochon_street but we're already implementing From just above - does it mean the Into impl is superfluous ?
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2021-07-06 12:28:50 cehteh Polochon_street: exactly
2021-07-06 12:29:01 cehteh see From docs ..
2021-07-06 12:29:21 cehteh fro everything where you define a From you get a Into for free
2021-07-06 12:30:01 GreenJello Polochon_street, it wants an `impl From<Location> for AVChromaLocation`
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2021-07-06 12:30:35 GreenJello instead of the Into
2021-07-06 12:31:12 Polochon_street so, no removing? /D
2021-07-06 12:31:12 Polochon_street :D*
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2021-07-06 12:36:16 elichai2 Is it possible to somehow typedef a generic definiton? ( e.g.` type MyIterator = IntoIterator<Item=u8> + MyIterator::IntoIter: ExactSizeIterator`
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2021-07-06 12:37:43 danieldg elichai2: you can make a trait bounded by that, and provide a global impl of it
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2021-07-06 12:40:19 GreenJello elichai2, https://play.rust-lang.org/?version=stable&mode=debug&edition=2018&gist=249a44a9f5296d04863f3e35dd4da33a
2021-07-06 12:41:21 GreenJello (could name 'Tr' to 'MyIterator' to match your example)
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2021-07-06 12:41:48 elichai2 gotcha, Thanks!
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2021-07-06 13:11:19 cehteh is there a minimalist async runtime, kindof featureless threadpool? i want to async a deep directory copy in the testsuite and not pull a big lib in
2021-07-06 13:11:52 j`ey smoll maybe
2021-07-06 13:12:21 trev does smoll use mio still?
2021-07-06 13:12:36 cehteh huh not on crates.io
2021-07-06 13:12:48 j`ey smol
2021-07-06 13:12:56 cehteh ah
2021-07-06 13:12:59 cehteh i check that
2021-07-06 13:13:00 j`ey ?crate smol
2021-07-06 13:13:02 j`ey ?crates smol
2021-07-06 13:13:16 j`ey https://crates.io/crates/smol
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2021-07-06 13:15:37 cehteh ah at least the crates smol pulls in looking like a trove
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2021-07-06 13:16:41 j`ey 10 deps
2021-07-06 13:17:27 j`ey and a bunch of those are made for smol
2021-07-06 13:17:41 cehteh yes i may just pull the 'blocking' alone or whatever is needed
2021-07-06 13:17:47 cehteh looks promising
2021-07-06 13:17:57 cehteh noted, will dive into that later
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2021-07-06 13:19:13 cehteh implementing a directory copy has surprisingly much corner cases
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2021-07-06 13:32:41 Arnavion j`ey: smol doesn't use mio. It uses async-io
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2021-07-06 13:33:59 j`ey trev: ^
2021-07-06 13:34:09 Arnavion Oh, sorry
2021-07-06 13:35:09 Arnavion cehteh: If you don't need an I/O reactor, then you can use futures_executor::LocalPool / ThreadPool, or just futures_executor::block_on
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2021-07-06 14:19:53 Polochon_street hi! Is there anyone with windows experience? I'm trying to debug this error on a CI https://github.com/zmwangx/rust-ffmpeg/pull/66/checks?check_run_id=3001469232, but I run into an infamous STATUS_DLL_NOT_FOUND
2021-07-06 14:20:06 Polochon_street of course, it doesn't specify which dll is not found, and I don't have a windows install at hand
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2021-07-06 15:14:56 edm what’s the most idiomatic way of turning a string of bytes, whose structure you know, into a struct? e.g. i have a message from a 3 axis compass that is 6 bytes long, 16 bits each of X, Y and Z axes and i’d like to parse it into struct mag_field { x: u16, y: u16, z: u16 }
2021-07-06 15:15:46 edm i should say specifically the message from the compass is [i8; 6]
2021-07-06 15:16:17 cehteh you know endianess?
2021-07-06 15:16:49 edm yes BE in this case
2021-07-06 15:17:11 edm but if there’s a nice way where to do it for arbitrary endianness that would also be nice to know
2021-07-06 15:17:52 cehteh serializer/serde perhaps
2021-07-06 15:18:35 cehteh but when it is really only 6bytes i prolly wont mind writing some ad-hoc code
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2021-07-06 15:19:51 edm indeed, i was just curious after doing the sort of slightly ugly thing of shifting the high byte left 8 bits and adding it to the low byte
2021-07-06 15:20:14 edm that works fine of course, just curious if there was a better idiom
2021-07-06 15:20:25 GreenJello there's u16::from_be_bytes, but you are going to need a bit of code to deal with the i8
2021-07-06 15:20:30 cehteh some of the serializer frameworks can do that, with more or less efforts
2021-07-06 15:20:45 GreenJello I don't think serde would make sense here
2021-07-06 15:21:24 edm that’s a handy looking constructor GreenJello
2021-07-06 15:21:25 edm thank you
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2021-07-06 16:48:41 Polochon_street got a problem that is driving me crazy - I'm building `rust-ffmpeg` on a windows target, and I specify the ffmpeg library dlls path. If I specify like `rustc-link-lib=static=avcodec`, etc, in principle the final binary should not care about having access to ffmpeg dlls, right?
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2021-07-06 16:49:02 Polochon_street (just asking if that's the reasoning in principle and if I screwed up somewhere, or if my assumption is wrong)
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2021-07-06 16:57:42 dav1d Polochon_street, depends?
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2021-07-06 16:59:01 Polochon_street what does it depend on ?
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2021-07-06 16:59:27 Polochon_street I'm getting a bit crazy trying to fix a CI on which I have no experience :D
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2021-07-06 17:00:58 dav1d what are you doing with the dll? If you link with the dll, you'll need it at runtime
2021-07-06 17:01:23 dav1d you're pretty much always gonna need the dll, if you use the dll
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2021-07-06 17:03:54 Polochon_street maybe my terminology is wrong as well - it's apparently using a full build providing .a, .dll, .lib, etc. I'm compiling using `-l static=avcodec`, etc, and `-L native=C:\Users\coucou\rust-ffmpeg\ffmpeg\lib`
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2021-07-06 17:08:58 dav1d I am glad I dont have to deal with windows ... .a sounds strange, this is usually an archive file generated by gcc/ar, are you compiling with mingw? The .lib (iirc) can be a static library or an import library, latter is for dynamic linking
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2021-07-06 17:10:06 dav1d I am not familiar with the linker (?) flags
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2021-07-06 17:10:27 dav1d or what the linker does on windows ...
2021-07-06 17:10:36 Polochon_street I'm using msvc on a windows VM
2021-07-06 17:10:45 Polochon_street (and that's as painful as it sounds, but I couldn't reproduce the CI otherwise)
2021-07-06 17:11:03 dav1d so, make sure you figure out what you're building and if the .lib file is the static library or just a the import library for dynamic linking
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2021-07-06 17:11:27 Yruama fuck my rust linter for vim is broken ;(
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2021-07-06 17:13:57 dav1d Polochon_street, do you have the entire rustc command?
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2021-07-06 17:15:58 southerntofu is that a bug or me? https://crates.io/crates/ANYTHING returns 404 from curl but displays well in a graphical browser?
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2021-07-06 17:17:57 dav1d southerntofu, different accept headers: curl -I https://crates.io/crates/ANYTHING -H "Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3;q=0.9"
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2021-07-06 17:18:41 southerntofu thanks, is there a specific reason why /crates/flexi_logger specifically would trigger a 404 in a code that's otherwise happy? (running guix lint on some new packages)
2021-07-06 17:18:45 southerntofu is it because of - vs _ ?
2021-07-06 17:20:04 dav1d not sure what you mean
2021-07-06 17:20:49 southerntofu ah i think i found it it's not used on the same attribute so this one must not send the correct headers, thanks
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2021-07-06 17:25:35 southerntofu it might make sense to not send a 404 when Accept is not very specific, though
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2021-07-06 17:25:49 southerntofu i find it weird i can curl a page and it 404s when it works in other browsers :)
2021-07-06 17:26:37 danieldg there's another error code for that, but most people don't use it
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2021-07-06 17:27:47 Polochon_street dav1d: here you are https://paste.isomorphis.me/Sfx (it's hairy)
2021-07-06 17:27:47 southerntofu that would already be a lot clearer since i was wondering why out of all the crates i'm importing only this one would 404, then realize other crates also 404d from curl despite working from guix lint... i was like wtf :P
2021-07-06 17:28:39 Polochon_street there's both ffmpeg-sys and ffmpeg being compiled. My only guess is that it's because the last compilation doesn't have the `-l static=foo`, but it's already happening in rust-ffmpeg-sys' step, so...
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2021-07-06 17:30:48 southerntofu danieldg, danieldg: someone in #guix quoted from RFC 2613 HTTP1.1
2021-07-06 17:30:49 southerntofu > If no Accept header field is present, then it is assumed that the
2021-07-06 17:30:52 southerntofu client accepts all media types.
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2021-07-06 17:32:46 Arnavion It's because the endpoint serves both the JSON API and the browser HTML, for historical reasons, so it needs the accept header to know which one you want
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2021-07-06 17:33:36 dav1d Polochon_street, no clue sorry, the theory I had is wrong. Maybe you can find out what library is missing via a debugger or something like `ldd` (if that exists on windows, probably does)
2021-07-06 17:33:55 Polochon_street I know that it's the ffmpeg linking that's missing (avcodec-58.dll, etc)
2021-07-06 17:34:00 southerntofu Arnavion: does that not make sense to serve default HTML over HTTP, as it is the language expected by all historical clients?
2021-07-06 17:34:14 Arnavion No?
2021-07-06 17:34:19 Polochon_street can't really figure out why though. But thanks for looking at it still :)
2021-07-06 17:34:21 southerntofu i mean something has to be better than nothing right?
2021-07-06 17:34:27 Arnavion Yes, and that something is the JSON API
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2021-07-06 17:35:45 dav1d southerntofu, not sure, curl might send a default accept header
2021-07-06 17:35:50 southerntofu Arnavion: well serving JSON would be better than a 404
2021-07-06 17:36:03 dav1d it could be a 404 and json ;)
2021-07-06 17:36:07 Arnavion They're not exclusive. It serves 404 and JSON
2021-07-06 17:36:08 southerntofu oh please not
2021-07-06 17:36:11 southerntofu -___-
2021-07-06 17:36:23 Arnavion which is exactly how an API should work.
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2021-07-06 17:36:59 southerntofu Arnavion: an API should return 404 for a resource that exist, and serve the content in the response???
2021-07-06 17:37:08 dav1d Curl sends `accept: */*` by default btw
2021-07-06 17:37:18 dav1d you can see that with `curl -v`
2021-07-06 17:37:32 dav1d southerntofu, but it doesn't exist
2021-07-06 17:37:48 dav1d in the API it does not exist, the UI behaves differently
2021-07-06 17:37:58 Arnavion southerntofu: Feel free to read the HTTP spec and recalibrate your expectations of what an HTTP 404 response should look like
2021-07-06 17:37:59 southerntofu dav1d: i confirm */* accept
2021-07-06 17:38:11 dav1d it's just unfortunate that UI and API collide
2021-07-06 17:38:15 southerntofu ah yes it does return a JSON for not found, sorry i didn't get this part
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2021-07-06 17:38:31 southerntofu my eyes skimmed over the JSON boilerplate :)
2021-07-06 17:39:11 southerntofu so is this route used for anything else over JSON?
2021-07-06 17:39:29 southerntofu or could it be changed?
2021-07-06 17:39:45 dav1d looks to me, by default crates.io interprets everything as an API request, except if you explicitly request html
2021-07-06 17:39:56 Arnavion Yes, as I said
2021-07-06 17:39:59 dav1d which does make sense
2021-07-06 17:40:52 Arnavion (If anything, the bug is that the browser HTML is served with HTTP 200 instead of also being served with HTTP 404)
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2021-07-06 17:41:28 southerntofu maybe there's something i don't understand but are those URLs not suppose to be used at all? why should it return 404 when asking for HTML?
2021-07-06 17:42:28 Arnavion Again, you are under the assumption that HTTP 404 responses cannot contain a body. Your assumption is incorrect
2021-07-06 17:43:27 southerntofu i'm not saying it should not contain a body
2021-07-06 17:43:29 Arnavion Does the resource identified by https://crates.io/crates/ANYTHING exist? If not, then 404 is a valid response code. That is completely unrelated to the content-type and body used for the response, which is perfectly okay to be HTML or JSON or anything else.
2021-07-06 17:43:42 southerntofu i'm saying the body i'm looking for served with a 404 is a semantic error :s
2021-07-06 17:43:55 southerntofu 404 means not found
2021-07-06 17:43:57 Arnavion And what you're saying is incorrect.
2021-07-06 17:45:00 j`ey thats how you have custom 404 html pages right?
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2021-07-06 17:45:16 Yruama i have an issue with sccache, it's breaks some option with clippy
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2021-07-06 18:01:51 Yruama hi, i have a weird issue, using sccache break cargo clippy, is there a way to workaround ?
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2021-07-06 18:02:40 Yruama what, i treid to update clippy, it's not available anymore ?
2021-07-06 18:03:22 Yruama does that mean it's obsolete ?
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2021-07-06 18:04:27 Yruama oops i tryed to update in the wrong way
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2021-07-06 18:10:43 Yruama anyway, it doesn't work too, and it seems i encounter a bug introduced in the last rust toolchain version
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2021-07-06 18:14:42 GreenJello is there a type that would let me get an owned Box<dyn io::Write + Send>, pass it to a function (moving it), and then after the function returns read it as a Vec<u8> or similar?
2021-07-06 18:15:03 GreenJello kinda like a channel but for io::Write, I guess
2021-07-06 18:15:48 Arnavion You need it to be convertible to and from Box<dyn Write> specifically?
2021-07-06 18:16:45 Arnavion Because Vec<u8> is already Write, and &mut impl Write is also already Write, so if the thing you're giving the writer to can just take any impl Write, give it the &mut Vec
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2021-07-06 18:20:56 GreenJello Arnavion, yeah, there's a function that specifically requires that type
2021-07-06 18:21:21 GreenJello I think it wants you to Box a Stdout or similar, but I need to read it from the code
2021-07-06 18:21:59 GreenJello I guess I could write to a temp file
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2021-07-06 18:22:18 GreenJello and then read it back after, but I'd prefer to do it in memory
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2021-07-06 18:23:27 Arnavion Arc<Mutex<Vec<u8>> -> wrapped in a newtype that impls Write -> Box<dyn> that. At the end std::mem::take(Arc::get_mut().unwrap().get_mut().unwrap()) gives you the Vec<u8> back
2021-07-06 18:23:45 Arnavion Only needs to chase about five pointers to get to the u8 :shrug:
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2021-07-06 18:27:59 GreenJello Arnavion, that should work, thanks!
2021-07-06 18:29:41 Arnavion Oh, Arc::try_unwrap is the Arc::into_inner I was looking for and didn't find
2021-07-06 18:30:00 Arnavion So use that and Mutex::into_inner instead of the two get_mut()s
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2021-07-06 19:10:42 Yruama lol, can i ask help for shortening variable/function name ? i want something shorter than "normalised angular frequency"
2021-07-06 19:11:11 j`ey naf
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2021-07-06 19:11:59 Yruama j`ey, i take it
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2021-07-06 19:12:54 j`ey lol, thats probably a bit too short. normalised_angluar_freq is probably as short as I can think
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2021-07-06 19:15:23 Yruama yes, but i'm creating something with this "from_normalised_angular_freq" is too long
2021-07-06 19:16:35 Yruama i started a "stupid" project consisting of translating some C++ to rust
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2021-07-06 19:17:28 SiegeLord Create a normalized angular frequency type, and then just implement From on it :P
2021-07-06 19:18:36 Yruama lol, doesn't work, because i need a second parameter
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2021-07-06 19:27:28 Yruama lol, and if i'm using symbol like ⍵
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2021-07-06 19:50:47 db48x not to be confused with ω
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2021-07-06 19:56:28 Yruama lol, i can't see the diffrence between ⍵ and ω, even if they are
2021-07-06 19:58:00 Yruama i think the code i'm translating will worth some refactoring
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2021-07-06 19:59:19 Yruama i have setter changing the whole object wich is equivalent of recreating a new one
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2021-07-06 22:57:34 dostoyevsky2 I use a docker container these days as my dev environment... is there a way I could compile a rust program for osx from linux/inside a docker container?
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2021-07-06 23:12:37 jbg `rustup target add aarch64-apple-darwin` or `rustup target add x86_64-apple-darwin` and then e.g. `cargo build --target aarch64-apple-darwin` (or x86_64) will get rustc producing the right object files, but you'll need a linker that can produce the right output too. on linux by default cargo uses `cc` to link, but you can change it
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2021-07-06 23:16:58 jbg your system `cc` won't make a macOS binary but there are various cross-compiling efforts that include a linker
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2021-07-06 23:22:33 jbg dostoyevsky2: https://github.com/tpoechtrager/osxcross would get you set up with a toolchain
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2021-07-06 23:24:34 jbg there's also https://github.com/multiarch/crossbuild which has osxcross in container images -- you could base a container image on the macOS-targeting one and add rust
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2021-07-06 23:38:18 dostoyevsky2 jbg: Ok, thanks! Will check out crossbuild!
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2021-07-07 00:10:03 printf does diesel support async
2021-07-07 00:12:04 printf i want to run diesel queries like mytable.load(&conn); in async and have it return a Fugure
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2021-07-07 00:13:17 printf *Future
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2021-07-07 00:23:07 printf or i should just use tokio-diesel?
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2021-07-07 00:41:20 jbg diesel itself does not support async. tokio-diesel is a bit of a hack that just uses tokio::task::block_in_place to shift the query off to a 'blocking thread'
2021-07-07 00:41:52 jbg I don't know if there's an async ORM for Rust; I can highly recommend tokio-postgres but it's probably not what you want if you don't want to write SQL
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2021-07-07 00:48:56 printf jbg yea i was thinking about using tokio::task::spawn_blocking() , so that's what diesel-tokio is doing
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2021-07-07 00:49:26 printf whats the standard practise for doing async database queries though
2021-07-07 00:49:27 jbg yeah. it will work but it's a *lot* heavier than a proper async library would be
2021-07-07 00:49:48 jbg using e.g. tokio-postgres you just txn.query("...", &[...]).await?; and the same thread can go and poll other tasks while the query is executing
2021-07-07 00:50:08 jbg using that tokio-diesel it marks the thread that calls diesel as 'blocking' and cannot use that thread for polling other tasks until the query completes
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2021-07-07 00:50:44 printf so tokio-postgres is actual async then
2021-07-07 00:50:47 jbg yes
2021-07-07 00:51:02 printf hmm, guess i should have a look
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2021-07-07 00:51:14 printf but does i need to write raw sql right?
2021-07-07 00:51:21 jbg but it's not an ORM like diesel; you will be writing SQL and binding parameters in
2021-07-07 00:51:43 printf it's fine, i can write raw sql queries
2021-07-07 00:51:47 jbg I personally find that approach much better, I've been writing SQL a long time and trying to find out the right incantations in diesel to get the query I want is a pain in the ass
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2021-07-07 00:52:04 jbg (and sometimes just flat-out not possible)
2021-07-07 00:52:06 rk4 +1 tokio-postgres
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2021-07-07 00:55:30 printf i actually always write raw sql too cuz i find it easier then learning those querybuilders in ORM, this is the first time i actually try to learn to use an ORM properly lol
2021-07-07 00:55:49 rk4 afaict ORMs were a bit of a failed fad in OOP land
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2021-07-07 00:57:06 jbg I would like some better tooling for catching errors in the SQL at compile time and type mismatches between query params / outputs and rust types
2021-07-07 00:57:34 jbg sqlx tries to do that but I don't like the database library. tokio-postgres with some kind of extra lints would be nice
2021-07-07 00:57:50 printf select * from users where user_type = '0' order by created_at desc <- much easier than doing something like users.filter(user_type.eq(0)).order(created_at.desc()) <- probably not the right syntax but my point is i need to learn the querybuilder API
2021-07-07 00:58:05 jbg but yeah going all the way to ORM adds a huge amount of complexity without much benefit and often makes it hard to use the full potential of the DB
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2021-07-07 00:58:47 printf even in diesel, i have to import all those querydsl, runQueryDSL, expressionmethods ... i just dunno which one i need to import
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2021-07-07 02:26:37 printf i got some warning about : checked the `Output` of this `async fn`, found opaque type, i have no idea what this is about
2021-07-07 02:26:50 jbg why paraphrase the warning instead of just pasting it?
2021-07-07 02:27:00 jbg I have no idea what it's about either because you mangled the meaning
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2021-07-07 02:29:36 printf https://paste.rs/6u2
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2021-07-07 02:30:16 jbg and the error...?
2021-07-07 02:30:27 printf probably shouldve used the .rs for syntax highlighting, https://paste.rs/A8R.rs
2021-07-07 02:30:33 printf its a warning
2021-07-07 02:30:39 printf not really an error
2021-07-07 02:30:56 printf an error about the return type of this function
2021-07-07 02:30:57 jbg I don't really understand your approach here
2021-07-07 02:31:10 jbg you seem to be asking for help, but you're not providing the one thing anyone would need to actually explain the warning
2021-07-07 02:31:14 jbg even after I asked for. it
2021-07-07 02:31:21 jbg which is... the warning
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2021-07-07 02:31:34 printf checked the `Output` of this `async fn`, expected opaque type <- this is the warning message i got
2021-07-07 02:31:47 jbg I am pretty sure it did not say "checked the"
2021-07-07 02:32:00 jbg is it really so hard to copy-paste the warning verbatim?
2021-07-07 02:32:20 printf it did say checked the `Output` of this `async fn` , expected opaque type, im not lying here
2021-07-07 02:32:22 jbg at least if it did say "checked the", it's not from rustc, so where did you see this warning?
2021-07-07 02:32:28 printf im using rust analyzer
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2021-07-07 02:32:39 jbg and that is the entire warning?
2021-07-07 02:32:47 printf yea, seriously
2021-07-07 02:32:48 bertptrs Compile normally and paste the entire output, not the management summary
2021-07-07 02:32:50 printf no joke
2021-07-07 02:32:56 jbg run cargo build and paste the actual warning
2021-07-07 02:33:18 jbg "checked the output of this async fn" doesn't sound like any rustc warning/error I've seen though
2021-07-07 02:34:17 printf yea its a rust-analyzer message
2021-07-07 02:34:36 jbg maybe run `cargo clippy` then and see
2021-07-07 02:34:46 jbg if it gives you a more useful message
2021-07-07 02:36:09 printf https://imgur.com/yWRivUw
2021-07-07 02:36:18 printf ill run cargo to get the actual rustc message now
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2021-07-07 02:38:29 printf http://ix.io/3sbS
2021-07-07 02:38:43 jbg yeah that's an actual error, not a warning
2021-07-07 02:39:10 printf but the error is in the other file though
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2021-07-07 02:39:16 jbg and it's in a different location
2021-07-07 02:39:30 jbg you're trying to make a Vec of futures, I guess, but every async fn has a different type
2021-07-07 02:39:35 jbg so you would need to box them
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2021-07-07 02:40:09 printf oh yes, im trying to make a Vec of futures
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2021-07-07 02:40:38 printf but my futureu functions return Result<(),Box<dyn std::error:Error + Send + Sync>> so i assumed they should be the same type
2021-07-07 02:40:58 jbg as I said, every async fn has a different type
2021-07-07 02:41:03 printf ok
2021-07-07 02:41:03 jbg the signature of the async fn is not relevant
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2021-07-07 02:41:51 jbg the type has to basically encapsulate the state machine of the async fn, so the signature alone isn't enough info
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2021-07-07 02:42:21 jbg anyway you'll have to box. if you have `futures` as a dep already, `futures::future::FutureExt` provides a handy .boxed() method on every future
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2021-07-07 02:42:27 printf so i should push Box::new(myAsyncFn()) to my vec
2021-07-07 02:42:28 jbg otherwise you can just Box::pin(the_future)
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2021-07-07 02:46:07 printf oh yea, i like that the futures lib provided a .box() method
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2021-07-07 02:46:24 printf seems like it's working now
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2021-07-07 02:46:39 printf thx man jbg :D
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2021-07-07 02:47:23 jbg np. in case you only have two types of future, you can also use Either from futures
2021-07-07 02:47:32 jbg to avoid the allocation
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2021-07-07 04:24:04 kee Can I safely transmute &[f32] to &[T] if #[repr(transparent)] struct T(f32)?
2021-07-07 04:24:16 kee I read that you couldn't do this with Vec<f32> and Vec<T>.
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2021-07-07 04:25:40 osa1 I want to deny warnings on CI, but when building locally (it make development difficult). Is this possible without hacks? I thought maybe there's a cargo flag to deny warnings, but I can't find it.
2021-07-07 04:26:06 j`ey hm https://doc.rust-lang.org/std/primitive.slice.html#method.align_to looks useful
2021-07-07 04:26:32 j`ey kee: ^
2021-07-07 04:27:17 j`ey so if transmuting f32 to T is ok..
2021-07-07 04:27:53 Shell osa1: RUSTFLAGS="-D warnings" apparently
2021-07-07 04:28:52 jbg (because it's a rustc flag rather than a cargo flag, it's explained in rustc --help)
2021-07-07 04:29:02 osa1 Thanks!
2021-07-07 04:29:33 bluss kee: yes
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2021-07-07 04:31:08 jbg I usually have CI run `cargo clippy -- -D warnings` before building
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2021-07-07 04:34:11 osa1 What does it do? Generates lints + warnings in one run and returns 1 if there are any lints or warnings?
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2021-07-07 04:35:25 jbg yeah
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2021-07-07 04:35:47 osa1 Perfect, thanks
2021-07-07 04:36:10 jbg the full CI here is basically `cargo deny check && cargo +nightly fmt -- --check --files-with-diff && cargo clippy -- -D warnings && cargo build --frozen --release`
2021-07-07 04:36:48 jbg fail if cargo-deny reports anything, fail if any files are not formatted according to rustfmt.toml (and output which files), fail if there are any lints or warnings, do a release build requiring that Cargo.lock is up-to-date
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2021-07-07 04:38:33 printf hi, i got an error about my HashMap failing to get serialized, the error message: the trait bound `AIType: Serialize` is not satisfied required becuase of the requirements on the impl of `Serialize` for `HashMap<AIType,std::string::String`
2021-07-07 04:39:01 jbg is AIType Serialize?
2021-07-07 04:39:10 printf AIType is an enum which i have Derived Serialize and Deserialize
2021-07-07 04:39:42 jbg I feel certain we talked about this before: would you consider pasting the whole error message?
2021-07-07 04:40:13 printf https://paste.rs/FyD.rs
2021-07-07 04:40:22 jbg that's not the error message
2021-07-07 04:40:29 jbg the error message includes the requirements that are not satisfied
2021-07-07 04:40:35 printf oh wait, posted wrong , just a sec
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2021-07-07 04:42:58 printf http://ix.io/3scb
2021-07-07 04:43:00 printf here it is
2021-07-07 04:43:20 jbg also, if you have more than one version of serde in your dependency tree (I see that you have #[serde(crate="rocket::serde")]) you will have to serialise using the same serde that you derived the traits with
2021-07-07 04:43:24 jbg *derived the trait impls with
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2021-07-07 04:43:40 jbg unless you have a really good reason it would be best to make sure you have just one version of serde in your dependency tree
2021-07-07 04:44:14 jbg but that's probably not your issue
2021-07-07 04:44:25 jbg the issue is right there in the error message, just not in the part that you originally pasted:
2021-07-07 04:44:26 jbg "the trait `Hash` is not implemented for `AIType`"
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2021-07-07 04:45:07 jbg you can derive Hash
2021-07-07 04:45:34 jbg also btw, you can use #[serde(rename_all = "lowercase")] on the enum rather than writing out a separate lowercase rename for each enum variant
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2021-07-07 04:48:34 printf yea im only using rocket's serde
2021-07-07 04:48:59 jbg as far as I know rocket's serde is just serde
2021-07-07 04:49:09 jbg you could add serde to Cargo.toml without adding any extra dependencies since you already depend on it via rocket
2021-07-07 04:49:20 jbg and then you can get rid of those (crate="") annotations
2021-07-07 04:50:35 printf i added Hash into the deriving list of AITYPe
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2021-07-07 04:51:23 printf #[derive(FromFormField,Debug,Hash,Serialize,Deserialize,PartialEq)]
2021-07-07 04:51:24 printf #[derive(FromFormField,Debug,Hash,Serialize,Deserialize,PartialEq)]
2021-07-07 04:51:24 printf #[derive(FromFormField,Debug,Hash,Serialize,Deserialize,PartialEq)]
2021-07-07 04:51:24 printf #[derive(FromFormField,Debug,Hash,Serialize,Deserialize,PartialEq)]
2021-07-07 04:51:24 printf #[derive(FromFormField,Debug,Hash,Serialize,Deserialize,PartialEq)]
2021-07-07 04:51:36 printf oh shit sorry
2021-07-07 04:51:43 printf didnt mean to post several times, my bad
2021-07-07 04:51:52 kee I am curious how you managed that.
2021-07-07 04:52:17 printf ctrl+c in neovim , then ctrl+v in thelounge
2021-07-07 04:52:17 j`ey blame a cat
2021-07-07 04:52:30 printf ctrl+shift+v
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2021-07-07 04:53:04 Sobek Meow
2021-07-07 04:53:06 printf ive derived Hash now but im stil getting the error AIType: Serialize not satisfied
2021-07-07 04:53:57 printf ive derived Hash,Serialize,Deserialize :/
2021-07-07 04:54:24 j`ey printf: as before, whole error is needed!
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2021-07-07 04:56:31 jbg printf: rust errors are really descriptive and useful in general -- if you read the whole thing!
2021-07-07 04:56:44 jbg so if you're asking anyone for help always paste the whole error message
2021-07-07 04:56:51 printf http://ix.io/3scg
2021-07-07 04:57:00 jbg and especially never paraphrase it because you might unknowingly be removing the meaning
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2021-07-07 04:57:17 jbg literally in exactly the same place as it told you Hash was missing
2021-07-07 04:57:19 jbg it now says: "the trait `std::cmp::Eq` is not implemented for `AIType`"
2021-07-07 04:57:25 jbg all you have to do is read it :)
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2021-07-07 04:59:13 printf man, didnt expect an enum needed to derive that many traits just to get serialised
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2021-07-07 04:59:33 jbg it's actually because you're using it as a hashmap key
2021-07-07 04:59:48 jbg so it needs to be able to be hashed (Hash) and compared for total equality (Eq)
2021-07-07 04:59:59 printf ohh, that makes sense then
2021-07-07 05:00:31 printf would using an enum as hashmap key be more performant than using a string
2021-07-07 05:01:15 printf i was thinking whether i should just use something like HashMap<String, Vec<MyData>> or HashMap<AIType,Vec<MyData>>
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2021-07-07 05:03:22 j`ey printf: depends what the enum contained
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2021-07-07 05:05:38 jbg hash() should be cheap on an enum with no data like the AIType that you pasted earlier, but the cost of hash() would not usually be the biggest factor in hashmap performance
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2021-07-07 06:21:39 tomboy64 i want to create a data structure that always gives me the smallest element from a bunch of (already sorted) Vecs. i figured the smartest way to go about that was to turn the vecs into iterators and stuff them into a BTreeSet, then always return the first element
2021-07-07 06:22:12 tomboy64 now i just need to create a struct that holds an Iterator, but how do i express that?
2021-07-07 06:22:21 tomboy64 (then implement Ord on it)
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2021-07-07 06:24:40 tomboy64 std::slice::Iter<'_, std::vec::Vec<i32>> ... now that's a mouthful
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2021-07-07 06:33:48 jbg implementing Ord on an iterator doesn't make a huge amount of sense right
2021-07-07 06:33:56 jbg an iterator is exactly one thing: a next() method
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2021-07-07 06:34:58 tomboy64 yes
2021-07-07 06:35:15 jbg but if you call next() it mutates the iterator and won't give the same value next time
2021-07-07 06:35:20 tomboy64 but with .peek() i can have them sorted by the next element
2021-07-07 06:35:28 Sobek (Math wise, sequence can be compared, however it would require consuming iterators, and additionally might not terminate when two iterators produces the same infinite sequence)
2021-07-07 06:35:58 jbg why turn the vecs into iterators at all?
2021-07-07 06:36:07 jbg vecs provide cheap access to the first element without any hacks
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2021-07-07 06:36:53 tomboy64 i was under the impression that the [] operator was more expensive than walking an iterator?
2021-07-07 06:37:15 jbg what gave you that impression?
2021-07-07 06:37:32 jbg a vec is just a ptr/len/capacity, [] is just dereferencing a pointer
2021-07-07 06:37:33 tomboy64 i want to create a sorted collection of all the elements in all (individually sorted) vecs
2021-07-07 06:37:39 tomboy64 no
2021-07-07 06:37:45 jbg whereas an iterator next has to at least update the iterator position
2021-07-07 06:37:51 tomboy64 in rust [] always checks the boundaries
2021-07-07 06:38:06 tomboy64 (for vecs)
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2021-07-07 06:38:16 tomboy64 akin to .at() in c++
2021-07-07 06:38:29 bluss good point tomboy64. An iterator checks for the iterator end on each iteration, just like a normal loop would do
2021-07-07 06:38:36 bluss that's the iterator bound check
2021-07-07 06:39:25 jbg and also has to mutate the iterator position (though that could get optimised out if you never use the iterator again? but maybe the bound check on [] would too if the vec can be proven non-empty and you are doing [0])
2021-07-07 06:39:37 jbg as usual the real answer is try it and see
2021-07-07 06:40:06 bluss creating a tree of iterators sounds surprising yes since an iterator modifies itself when you step it
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2021-07-07 06:40:19 tomboy64 bluss: isn't that just walking a pre-defined range?
2021-07-07 06:40:22 jbg using iterators doesn't seem like a clean design here; start with the clean design and then check if it works for your performance-wise
2021-07-07 06:40:32 jbg *you
2021-07-07 06:40:34 tomboy64 fair enough
2021-07-07 06:41:14 jbg you don't need to store the vecs anyway right
2021-07-07 06:41:28 tomboy64 no
2021-07-07 06:41:38 jbg only their first elements since the smallest element out of all of them can't be any index beyond the first of any of them
2021-07-07 06:41:38 tomboy64 just the (strictly increasing) index
2021-07-07 06:41:44 tomboy64 *indices
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2021-07-07 07:01:29 tomboy64 ^^ thanks for the input btw
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2021-07-07 07:15:34 jaafarrc Can I make cargo not dox my email?
2021-07-07 07:16:40 jbg lol what
2021-07-07 07:16:42 j`ey I dont think the author field needs an email
2021-07-07 07:16:47 jbg you can put whatever you want in that field
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2021-07-07 07:17:13 jbg if you put your email in there and publish a crate, you're really doxing yourself, you can't blame the tool
2021-07-07 07:17:24 jaafarrc Yeah, but, I want cargo *not* to add my email by default.
2021-07-07 07:18:22 jbg would be nice if `man cargo-init` documented where it got the defaults from those fields from
2021-07-07 07:18:32 jaafarrc It's so annoying having to change it and pretty prone to being forgotten about by me, since, I'm pretty forgetful.
2021-07-07 07:18:33 capitol i guess it picks it up from git, so just configure your git with a bogus one
2021-07-07 07:18:35 j`ey CARGO_EMAIL="" cargo new
2021-07-07 07:18:36 Sobek Quick question in rust what is the best practice when it comes to license (license choice but more importantly what needs to be done in practice to properly put notices where needed etc)
2021-07-07 07:19:18 jaafarrc jbg: no manuale entry for cargo-init
2021-07-07 07:19:19 jbg which license you choose is up to you, it has no real relation to the language you're writing the code in
2021-07-07 07:19:19 Sobek (Let’s assume I am going for a MIT+Apache combo as most if rust ecosystem)
2021-07-07 07:19:23 jaafarrc manual*
2021-07-07 07:19:39 jbg Cargo.toml has a license field, you may consider using a tool like cargo-deny to ensure dependencies are compatible (Most are compatible with MIT/apache)
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2021-07-07 07:19:57 j`ey wait.. my cargo doesnt put an author field by default
2021-07-07 07:19:58 jbg apart from that it's the same as in any ecosystem; put a license file in the repo and put headers in source files if you're into that
2021-07-07 07:20:07 jbg j`ey: yeah neither does mine
2021-07-07 07:20:17 j`ey jaafarrc: what cargo version are you on?
2021-07-07 07:20:28 Sobek Do I also need to include the license text (that’s obviously yes), add a notifie in the Readme ? At the top of every source file ?
2021-07-07 07:20:47 jbg Sobek: that's entirely up to you
2021-07-07 07:20:52 jbg nothing to do with Rust
2021-07-07 07:21:02 jaafarrc j`ey: cargo 1.53.0 (numbers 2021-04-27)
2021-07-07 07:21:03 j`ey whatever the license dictates!
2021-07-07 07:21:14 jbg Sobek: https://softwareengineering.stackexchange.com/questions/317041/should-i-add-the-license-in-every-header-and-source-file/423494
2021-07-07 07:21:17 j`ey jaafarrc: weird
2021-07-07 07:21:20 Sobek Ok. Do you have any pointers on the Pro/cons of source file headers ?
2021-07-07 07:21:31 Sobek Thanks (oops race condition)
2021-07-07 07:21:36 jbg googling the question gave that as the first result, and the top answer seems good
2021-07-07 07:22:04 j`ey jaafarrc: I wonder if this changed, im on 1.54 / nightly
2021-07-07 07:22:22 jbg I have a bunch of cargo projects here created on various rust versions and none of them have author fields in Cargo.toml
2021-07-07 07:22:35 jbg must be something environmental
2021-07-07 07:22:40 jaafarrc Does rustup even package manuals by default? I picked the "minimal" install.
2021-07-07 07:22:43 jbg which ideally would be documented in cargo-init
2021-07-07 07:22:53 j`ey yeah cos I have some that do have authors
2021-07-07 07:23:10 jbg jaafarrc: I use rustup and `man cargo-init` (the same as `cargo help init`) works fine, but I didn't pick a minimal install
2021-07-07 07:24:57 jaafarrc Well, I guess the minimal install omits the manual entries.
2021-07-07 07:25:09 jaafarrc But `cargo help *` works fine.
2021-07-07 07:25:11 jbg seems appropriately minimal
2021-07-07 07:25:21 jaafarrc Yeah.
2021-07-07 07:26:40 jbg are you sure you're creating new cargo projects with 1.53?
2021-07-07 07:26:54 jbg because from the changelog: https://github.com/rust-lang/cargo/blob/af6d540a70b1170d0a57b5db666c01201fd2f2cc/CHANGELOG.md#cargo-153-2021-06-17
2021-07-07 07:26:54 jaafarrc How do I check?
2021-07-07 07:27:01 jbg "The authors field is no longer included in Cargo.toml for new projects"
2021-07-07 07:27:14 jbg maybe you created the cargo project in question before upgrading?
2021-07-07 07:27:30 jaafarrc Perhaps.
2021-07-07 07:27:33 jbg cargo --version; cargo init testproject; grep authors testproject/Cargo.toml
2021-07-07 07:27:33 jaafarrc I'll try now.
2021-07-07 07:28:04 jaafarrc Yup. No author field.
2021-07-07 07:28:23 j`ey jbg: great, thought I was going mad
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2021-07-07 07:29:14 jaafarrc Thanks, guys.
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2021-07-07 07:29:17 jbg it used to populate it from checking a series of environment variables
2021-07-07 07:29:29 jbg CARGO_NAME -> GIT_AUTHOR_NAME -> GIT_COMMITTER_NAME -> USER -> USERNAME -> NAME
2021-07-07 07:29:46 jbg and CARGO_EMAIL -> GIT_AUTHOR_EMAIL -> GIT_COMMITTER_EMAIL -> EMAIL
2021-07-07 07:30:02 jbg so yeah if you had git configured with your email address it would have got it from there
2021-07-07 07:30:15 jbg hah actually even if you didn't use the env vars
2021-07-07 07:30:25 jbg because it also looked up the git config for user.name and user.email
2021-07-07 07:30:46 j`ey jbg: so you dont have a global .gitconfig?
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2021-07-07 07:31:02 j`ey since you didnt have authors
2021-07-07 07:31:05 jbg I don't; I use local ones per-repo to avoid accidentally using a work email on personal projects or vice-versa
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2021-07-07 07:31:26 jbg so user.name and user.email would not have been set until after the cargo project was initialised
2021-07-07 07:31:45 jbg but I'm not sure why I don't have any authors, I would have expected authors = ["jbg"] based on looking at the cargo source from pre-1.53
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2021-07-07 07:45:41 bluss cargo doesn't set authors anymore
2021-07-07 07:46:22 bluss since https://github.com/rust-lang/cargo/pull/9282
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2021-07-07 08:42:36 j`ey someone on the forum says "community seem to believe that a = b can't trigger allocations", when can a = b allocate?
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2021-07-07 08:43:34 jbg I think it can't?
2021-07-07 08:44:06 jbg technically they don't say the community's belief is false ;)
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2021-07-07 08:44:16 j`ey heh
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2021-07-07 08:45:03 jbg a = b is always a copy (bitwise by definition) or a move, innit?
2021-07-07 08:45:19 j`ey yeah.. so idk
2021-07-07 08:46:52 j`ey wait, a could be dropped
2021-07-07 08:47:02 j`ey which could allocate
2021-07-07 08:47:40 jbg aha
2021-07-07 08:47:49 bluss nice puzzle
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2021-07-07 08:48:53 timemage kind of reminds me of https://xkcd.com/559/
2021-07-07 08:49:35 j`ey hehe
2021-07-07 08:50:24 bluss I'd still want to ask what phaylon was thinking of
2021-07-07 08:51:25 j`ey bluss: you have an account, i dont :P
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2021-07-07 08:54:02 bluss I'm outed. I'll write the question.
2021-07-07 08:54:15 bluss In a new topic, as discord intended
2021-07-07 08:54:29 j`ey *discourse
2021-07-07 08:54:47 bluss yeah..
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2021-07-07 08:55:25 bluss I recently came back to irc, too. Never got the hang of discord.
2021-07-07 08:55:37 j`ey bluss: I'm happy to see you back
2021-07-07 08:55:47 j`ey I think you were gone for at least 2 years?
2021-07-07 08:56:05 bluss or more. It was never the same to me after Rust moved the community to discord
2021-07-07 08:56:22 j`ey on irc we still kept on :)
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2021-07-07 08:57:49 j`ey talchas was another that i think moved to discord from irc
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2021-07-07 08:59:30 bluss my "main" rust interest is ndarray I guess, and we use #rust-sci:matrix.org, on matrix. But there's a bridge #rust-sci on oftc (which sometimes doesn't work).
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2021-07-07 09:00:13 j`ey bluss: are you working with rust?
2021-07-07 09:00:26 bluss in my job, no, not so far
2021-07-07 09:01:08 j`ey shame
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2021-07-07 09:13:00 bluss j`ey: I guess there is a non-obvious distinction between let a = b1; a = b and let a = b1; let a = b; since the latter does not cause the old value to drop (in itself) - shadowing doesn't do such a thing
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2021-07-07 11:27:42 jaafarrc I have a packaged called "foo-rs" that should produce a binary called "foo". How do I tell Cargo to compile the binary as "foo" instead of "foos-rs"?
2021-07-07 11:27:57 jaafarrc (In Cargo.toml, that is.)
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2021-07-07 11:31:31 j`ey [[bin]]\nname = "foo"\npath = "src/main.rs"
2021-07-07 11:31:58 jaafarrc Thanks.
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2021-07-07 11:49:01 talin hello. i made a telnet client a while back that can connect to a remote host and then it can process user input and send that to the remote host. i used a TcpStream and a non-blocking socket and a separate thread that handles user input for this... the timeout on the network socket is very low, so it's basically like a busy-wait with a low timeout that is constantly checking a socket for new data. is there a
2021-07-07 11:49:07 talin way to wait for the OS to signal that there is new data to fetch?
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2021-07-07 11:51:11 saatii select/poll/io_uring or some async framework built on those?
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2021-07-07 12:11:00 talin saatii: i will look into those and see if they can help
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2021-07-07 12:32:08 kee Is there a crate that computes the Gaussian function? I'm trying to do FFT stuff.
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2021-07-07 12:53:16 dav1d does std have a lookup_addr for reverse dns? I am finding a few issues that it used to exist, but not what it was replaced with or if it is gone for good
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2021-07-07 12:54:53 dav1d merged here: https://github.com/rust-lang/rust/pull/23419/files - but doesn't exist?
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2021-07-07 12:56:35 trev there's no way to match on a const array right?
2021-07-07 12:57:32 nox What do you mean?
2021-07-07 12:57:42 nox Like, a const array as a pattern?
2021-07-07 12:58:02 trev yeah
2021-07-07 12:58:25 trev match buffer { CONST_ARRAY => {..} }
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2021-07-07 12:58:47 nox AFAIR you can do that, just like with any other constant
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2021-07-07 12:59:09 nox E.g. you can use associated constants as patterns
2021-07-07 13:00:26 trev i must be doing something wrong then. back to the drawing board
2021-07-07 13:02:16 trev maybe it's cause i'm matching on &[u8] but the const is [u8;3]
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2021-07-07 13:03:51 kee trev: That should work. If not, try `x if x == CONST_ARRAY` (ugly, but usually works, or gives a better error message).
2021-07-07 13:03:56 trev i guess i can do the binding if
2021-07-07 13:04:01 trev kee yeah exactly
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2021-07-07 13:18:53 Yruama hi, i'm translating some code using lookup table, is there a type better than array to avoid bound checking penalty ?
2021-07-07 13:21:00 j`ey you can write a wrapper that avoids bounds checking
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2021-07-07 13:21:10 j`ey (or just use the unsafe methods directly)
2021-07-07 13:23:34 Yruama a wrapper that use unsafe method internally ?
2021-07-07 13:23:41 j`ey yeah
2021-07-07 13:24:01 j`ey i wish there was a version that checked in debug but not release
2021-07-07 13:24:31 Yruama this is the first way ot come in my mine but i wandered if there was a way not involving unsafe code
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2021-07-07 13:26:11 j`ey reading off the end of an array is UB, so no
2021-07-07 13:26:33 GreenJello you could make a struct Unchecked<T>([T; 256]) and have methods take a u8 for the index and do unchecked access
2021-07-07 13:27:07 j`ey still needs unsafe
2021-07-07 13:27:33 j`ey Yruama: I would also just use an array until you can check if the performance is hindered by the bounds checks
2021-07-07 13:27:33 GreenJello yeah, but trivial to get right
2021-07-07 13:29:44 j`ey https://docs.rs/unchecked-index/0.2.2/unchecked_index/
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2021-07-07 13:30:42 Yruama j`ey i think bound checking have influence, because it's DSP and if i understood correctly these lookup table are used to aproximate some calculation throught polynomial interpolation
2021-07-07 13:31:25 j`ey Yruama: yeah, but I would still suggest you just use an array first
2021-07-07 13:31:43 j`ey get it working, then you can look at using some unchecked indexing
2021-07-07 13:32:20 Yruama J`ey yeah array first to see if it work, but think i will quickly remove the bound checking
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2021-07-07 13:34:58 Yruama but i'm not a it yet, i wandered this question because i'm currently replacing an arry of 2 value by tuble because bound checking
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2021-07-07 13:35:46 j`ey that doesnt sound right
2021-07-07 13:35:58 j`ey if you use a tuple, you statically know the indices
2021-07-07 13:36:19 j`ey so the compiler should be able to remove the bounds checking on an array too
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2021-07-07 13:38:35 Yruama no, there is an index variable somewhere in the original code
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2021-07-07 13:39:20 j`ey so youre doing: if index == 0 { a.0 } else { a.1 } ?
2021-07-07 13:39:33 Yruama exactly
2021-07-07 13:39:37 j`ey (You could do the same thing with an array!)
2021-07-07 13:39:56 Yruama oops
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2021-07-07 13:40:36 Yruama but the arry don't have any advantage here anyway
2021-07-07 13:40:45 Yruama there is not iteration over it
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2021-07-07 13:41:59 witcher how frequently are tuples generally used in rust programming? every time I use them I decide to just declare a new struct since it gives more context than an index
2021-07-07 13:42:30 Yruama i keep the array just to limits rewrite
2021-07-07 13:42:49 kee witcher: I use them whenever I have something that's logically a pair/etc. where the context is obvious.
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2021-07-07 13:43:07 dav1d Yruama, almost sounds like you could use an enum
2021-07-07 13:43:18 witcher kee, that makes sense true. haven't stumbled upon that use case yet
2021-07-07 13:43:18 Yruama lol, i the context, i don't understand the calculation :/
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2021-07-07 13:43:38 kee witcher: Vec<(&'a str, usize)> might seem familiar, too.
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2021-07-07 13:43:55 witcher kee, i'm pretty new to rust, what's that usually used for?
2021-07-07 13:43:57 kee But it's usually return values, apart from that.
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2021-07-07 13:44:39 kee witcher: If you need to store a list of names and values (e.g. high score table, though you'd probably use u64 or something instead of usize for that), you might represent it that way.
2021-07-07 13:44:45 j`ey Yruama: you could also do: array[index & 1]
2021-07-07 13:45:04 GreenJello iter.enumerate() is a common example, where it turns an iterator of T to an iterator of (usize, T), i.e. the index and value
2021-07-07 13:45:12 j`ey https://godbolt.org/z/cdanWvj74 that gets optimise Yruama
2021-07-07 13:45:26 GreenJello or iterating over a HashMap where you get the key and value in a tuple
2021-07-07 13:45:37 kee witcher: And also iter.size_hint(), which returns (usize, Option<usize>).
2021-07-07 13:45:41 witcher kee, hm usually i'd use a HashMap for that
2021-07-07 13:46:00 GreenJello they're also pretty useful for generic code where having structural types can be useful
2021-07-07 13:46:09 kee witcher: If you want to store the scores for each name, yes, but if you just want a list of names-and-scores, no.
2021-07-07 13:47:33 witcher kee, makes sense
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2021-07-07 13:48:56 witcher GreenJello, i'm realizing i haven't used enough methods of the standard library to see it's used sometimes :v)
2021-07-07 13:49:34 Yruama thank j`ey, but replacing idx by a boolean make it more clear, and produce almost the same code
2021-07-07 13:49:47 j`ey Yruama: sure
2021-07-07 13:49:54 Yruama https://godbolt.org/z/sM3cv77zG
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2021-07-07 13:50:44 Yruama j`ey, but thank for godbolt, i forgot i could use this for optimization
2021-07-07 13:51:56 nemo speaking of godbolt only tangentially related to rust, but the following was linked off a comparison of language memory models that was on HN the other day. I thought it was pretty O_o
2021-07-07 13:52:00 nemo https://nitter.1d4.us/andywingo/status/903577501745770496
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2021-07-07 13:52:52 nemo was off of https://research.swtch.com/plmm which, while bringing up rust, didn't really discuss it much.
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2021-07-07 13:54:49 Tacklebox Is there a clean way to call a function `(u32) -> Option<u32>` with an option for the parameter and have it skip the function if it's None?
2021-07-07 13:55:46 j`ey Tacklebox: https://doc.rust-lang.org/std/option/enum.Option.html#method.and_then
2021-07-07 13:55:47 witcher Tacklebox, maybe `and_then`?
2021-07-07 13:56:10 Yruama j`ey, i tryed a version with tuple, the function don't even appear in the assembly 0_o
2021-07-07 13:56:12 Yruama https://godbolt.org/z/G8W666qGj
2021-07-07 13:56:18 j`ey Yruama: make it pub
2021-07-07 13:56:25 j`ey Yruama: ok
2021-07-07 13:56:35 j`ey Yruama: it's the same assembly as another function, *exactly*
2021-07-07 13:56:38 j`ey so it doesnt show up
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2021-07-07 13:58:05 Yruama ok, thank, i didn't that function with same assembly wasn't showed
2021-07-07 13:58:07 Tacklebox Looks like what I was thinking of, thanks peeps
2021-07-07 13:58:44 j`ey Yruama: well it's not that it isn't showed, it's just that in the binary it basically says 'these 2 symbols are this same function'
2021-07-07 14:00:08 Yruama j`ey so something is visible in the asembly code ?
2021-07-07 14:00:23 nemo "Rust 1.0.0 in 2015 and Swift 5.3 in 2020 both adopted the C/C++ memory model in its entirety, with DRF-SC or Catch Fire" "None of the languages have found a way to formally disallow paradoxes like out-of-thin-air values, but all informally disallow them."
2021-07-07 14:00:36 nemo well I guess that was the sum total of his Rust coverage. I suppose nothing more was really needed.
2021-07-07 14:00:50 j`ey Yruama: line 304 https://godbolt.org/z/KvYhd5n3h
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2021-07-07 14:17:23 Yruama lol, finally, i will use you & 1, it actually generate less assembly than boolean test on x86
2021-07-07 14:18:10 j`ey and on aarch64
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2021-07-07 14:27:01 Yruama j`ey on arch i had same number of assembly instruction (one line = one instruction ,isn't it ?)
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2021-07-07 14:29:42 j`ey Yruama: it was 1 instruction less
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2021-07-07 14:46:05 georgemp if i have developed a `lib A` which depends on `lib B` which has 2 fns `fn b1()` and `fn b2()`. Lib A only use B.b1(). If i compile A into a static lib, I assume it's only going to contain the code for B.b1() and not B.b2()? If I want my consuming app to use B.b2(), I'd have to link statically or dynamically to lib B separately? When linking separtely, would I have duplicate defns of B.b1()?
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2021-07-07 14:46:58 Yruama lol, no way to have same number of instruction as get_unchecked
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2021-07-07 15:08:50 dcz how to format a rational number into a decimal representation?
2021-07-07 15:10:11 danieldg rational number libraries should have this as an option
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2021-07-07 15:10:28 danieldg if you want an approximation, just convert to f64
2021-07-07 15:11:54 dcz I'm trying to find this in num_rational and failing
2021-07-07 15:15:12 dcz time to copy someone's hack :| weird not to have conversion in a prominent place in the docs
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2021-07-07 15:26:59 kupi hi, how to make this not require copy? https://gist.github.com/theqp/af46dcffa3da98f944f6abc80e293c20
2021-07-07 15:27:34 j`ey kupi: it has to require COpy or CLone
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2021-07-07 15:27:49 j`ey or return &V not V
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2021-07-07 15:33:08 dcz in what situations can I expect a fmt::Error? it looks like a unit struct, not much clue
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2021-07-07 15:37:54 kupi I guess a lifetime parameter is needed? https://gist.github.com/theqp/a1d03265688a3f49d7c05aed9b64a856
2021-07-07 15:38:25 GreenJello dcz, I don't think you ever get one from std, but another crate could impl std::fmt::Write
2021-07-07 15:39:07 GreenJello oh right, a Display or Debug impl can return the Error
2021-07-07 15:39:16 j`ey kupi: &self.value instead
2021-07-07 15:39:27 dcz can it come from problems with the destination rather than the data?
2021-07-07 15:39:37 j`ey kupi: and change the Option back to <V> not <&V>
2021-07-07 15:40:09 GreenJello dcz, yes, but you should probably be using io::Write if that's possible
2021-07-07 15:40:58 dcz fair point. Maybe I shouldn't be investing in something that's already a hack
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2021-07-07 15:41:30 kupi j`ey: i can't assign to a borrowed value
2021-07-07 15:41:58 kupi > assignment to borrowed `self.value` occurs here
2021-07-07 15:42:10 j`ey kupi: paste the current code
2021-07-07 15:42:31 kupi https://gist.github.com/theqp/888ff96ec46c05332ac0a10ebc0ec503
2021-07-07 15:42:45 j`ey kupi: &self.value
2021-07-07 15:42:51 j`ey on line 26
2021-07-07 15:43:21 j`ey oh hm
2021-07-07 15:43:55 j`ey ok yeah, it's cos of the match
2021-07-07 15:44:59 j`ey fixed https://play.rust-lang.org/?version=stable&mode=debug&edition=2018&gist=e26d71d6a07a1988d9c3bb147fb6d1d7
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2021-07-07 15:46:14 kupi j`ey: is it possible without unwrap?
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2021-07-07 15:48:15 ec How do I impl To/From for foreign types?
2021-07-07 15:50:32 GreenJello ec, one of the types has to be defined by the current crate
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2021-07-07 15:50:52 GreenJello in which case it should work as long as it doesn't conflict with another impl
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2021-07-07 15:53:01 ec I might be XY'ing, I just want U256 -> [u8] to be big-endian just calling into()
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2021-07-07 15:54:38 GreenJello not possible with Into/From, but you could implement your own trait for converting things to big endian byte arrays
2021-07-07 15:54:52 GreenJello and impl it for arbitrary types
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2021-07-07 15:55:49 danieldg you can also wrap it in a locally defined struct if you relly need Into
2021-07-07 15:56:22 ec Yeah have a bunch of options just looking for the most idiomatic/less boilerplate approach
2021-07-07 15:56:36 ec Think own trait is the way to go
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2021-07-07 16:03:49 j`ey kupi: why do you want to avoid unwrap?
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2021-07-07 16:04:34 kupi j`ey: because the compiler knows we have a value in both cases
2021-07-07 16:05:27 j`ey unfortunately the type system doesnt work like that
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2021-07-07 16:07:13 j`ey hm actually: https://play.rust-lang.org/?version=stable&mode=debug&edition=2018&gist=9c559a340e918b24460d24aaf9c8c306
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2021-07-07 16:10:22 j`ey kupi: ^
2021-07-07 16:10:35 kupi thanks a lot
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2021-07-07 16:13:16 raekye Hi, I have some code that looks like this (simplified) https://play.rust-lang.org/?version=stable&mode=debug&edition=2018&gist=203170e3b4b142a3199887180a00cd65
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2021-07-07 16:14:00 raekye Roughly, I borrow something in one branch and return it, and in the other branch I do something else with it and return it
2021-07-07 16:14:57 raekye It seems like it should be ok because in the second branch, the first borrow is nolonger used
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2021-07-07 16:15:43 raekye I've tried rewriting it a few ways and I guess the borrow checker just can't deal with it. But I'm wondering what's the best alternative for the pattern in the gist?
2021-07-07 16:15:46 danieldg yep, it should be ok, but the compiler rejects it anyway
2021-07-07 16:16:36 raekye Roughly, I have one function bar which has a bunch of match cases, and another function baz which is a superset of bar's cases, so rather than copy pasting the cases from bar to baz, I want to just call bar in baz
2021-07-07 16:17:05 danieldg you can call the function in the _ case
2021-07-07 16:17:27 raekye ah smart
2021-07-07 16:17:30 raekye thanks!
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2021-07-07 16:18:26 GreenJello a general alternative is to return the mutable reference back in an Err https://play.rust-lang.org/?version=stable&mode=debug&edition=2018&gist=c05a9df5c87158dd8f06ad1d24bbf913
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2021-07-07 16:19:18 GreenJello (of course you would use match, but wanted to change the code minimally)
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2021-07-07 16:20:11 raekye ah interesting
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2021-07-07 18:24:06 Yruama hi, i have a stupid issue, my crate can't find the cargo.toml of a crate in the same workspace, i don't know what i did wrong
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2021-07-07 18:25:54 Yruama lol, my eye need to be cleaned, i wasn't able to see in the error message path was wrong
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2021-07-07 20:27:21 neshpion i'm practicing rust so i ported a small challenge question to rust: i'm calculating the sum of all even fibonacci nums to 4 million. it works but it's ugly to me, and i think i maybe don't grasp the idioms expected in rust. can i get some feedback? https://termbin.com/cjw9 there is my solution in julia, javascript, and rust at the bottom. i particularly dislike how i ended up using
2021-07-07 20:27:23 neshpion `arr.iter().map(|n| *n)` in a couple of places. maybe i am doing things in a stupid way?
2021-07-07 20:27:55 danieldg .cloned
2021-07-07 20:28:03 danieldg or .copied
2021-07-07 20:28:54 neshpion so e.g. in `evens` i could do `arr.cloned().iter().filter(iseven).collect()` ?
2021-07-07 20:28:54 danieldg you can .sum iterators
2021-07-07 20:29:03 neshpion oh x)
2021-07-07 20:29:04 danieldg .iter.copied
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2021-07-07 20:31:05 danieldg making a new vector every time is worse than adding to an existing one
2021-07-07 20:31:05 rk4 instead of filtering out odd numbers, could you *2 instead
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2021-07-07 20:31:39 rk4 ah wait, disregard (:
2021-07-07 20:31:49 neshpion i was about to wonder if that was some magic property of fibonacci numbers :P
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2021-07-07 20:32:37 rk4 nah just someone only reading 1/5th the code while working
2021-07-07 20:32:38 danieldg return &[u64] from tail instead
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2021-07-07 20:50:31 neshpion ok with iter::copied() and sum() i was able to erase some extraneous things and now it looks like this https://termbin.com/nvtx
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2021-07-07 20:52:21 Mutabah Probably better to return an iterator that yields fibonachi numbers
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2021-07-07 20:57:22 danieldg tail-sum as a single function might be nicer
2021-07-07 20:57:22 danieldg but this is all just what-looks-nice now
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2021-07-07 22:27:22 discipulus is there an emacs package that allows me to search and display the standard library documentation?
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