Recent questions tagged rust

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rust - Is there a shortcut to unwrap or continue in a loop?

Consider this: loop { let data = match something() { Err(err) => { warn!("An error: {}; skipped.", ... let that would also return the ok-value. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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883 views

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rust - Why are const atomic variables not updated, but static atomic variables are?

I have this code: use std::sync::atomic::{AtomicUsize, Ordering}; const SOME_VAR: AtomicUsize = AtomicUsize::new(0 ... it not work with const? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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975 views

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rust - Why can a Cargo package only have one library target?

According to its manual, Cargo packages can have multiple executable targets, but only one library target is ... the reasons and benefits? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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rust - Problems with mutability in a closure

I really don't know how to get past this. As far as I understand it, words is moved into the closure ... pushed. Commit 633ed60 to be specific. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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874 views

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rust - Pass None into a function that accepts Option

rust-ini has a function: pub fn section<'a, S>(&'a self, name: Option<S>) -> Option<&'a ... this without the additional line with none? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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891 views

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rust - How do I sort an array?

Why cannot I not sort an array as expected? fn main() { let mut a = [1,3,2]; let s = a.sort(); println!("{:?}", s); } See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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rust - How do I bound a generic type with a trait that requires a lifetime parameter if I create the reference inside the function?

I want to implement a generic fibonacci function that works with any type implementing Zero, One, and AddAssign. ... the lifetime of f1. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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750 views

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rust - How can I define an async method in a trait?

I have a trait that I'm using to abstract away tokio::net::TcpStream and tokio::net::UnixStream: /// ... traits. How can I handle this? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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rust - How do I pass Rc<RefCell<Box<MyStruct>>> to a function accepting Rc<RefCell<Box<dyn MyTrait>>>?

I have originally asked this question here, but it was marked as duplicate, although it duplicates only a part of ... to go around this problem? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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rust - Why would you ever use the same lifetimes for references in a struct?

This question is similar to When is it useful to define multiple lifetimes in a struct?, but hopefully different ... have the same lifetime? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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719 views

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rust - What is the {integer} or {float} in a compiler error message?

It is surprisingly hard to find this in the docs. This might even be a two part question: Are {integer} and ... {integer} in the current scope See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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rust - How to implement `serde::Serialize` for a boxed trait object?

I ran into a problem trying to create a generic vector for a struct. This was my first attempt: #[derive( ... like you would with an interface. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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rust - How can I do a mutable borrow in a for loop?

I tried: fn main() { let mut vec = [1, 2, 3]; for mut x in &vec { *x = 3; } for mut &x in ... cannot assign to *x which is behind a & reference See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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rust - Why am I getting "parameter is never used [E0392]"?

I'm trying to implement an Octree in Rust. The Octree is generic over a type with a constraint that it should ... bug? How to do this properly? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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765 views

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rust - No method named `poll` found for a type that implements `Future`

I am attempting to create a struct that will allow someone to call .shutdown(), which will resolve a future ( ... using nightly (2019-07-18). See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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992 views

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rust - How can I create a Tokio runtime inside another Tokio runtime without getting the error "Cannot start a runtime from within a runtime"?

I'm using rust_bert for summarising text. I need to set a model with rust_bert::pipelines::summarization::SummarizationModel:: ... ) ); } } } See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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831 views

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rust - Understanding (automatic?) Deref/coercion when adding references and values of numbers

How to make sense of the following piece of code? I'm new to Rust but have background on C/Haskell and a little bit C ... } println!("{}", i); } See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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765 views

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rust - What is the proper way to go from a String to a *const i8?

In my ongoing saga of writing a safe wrapper for the Cassandra C++ driver, my eye now turns towards ... ::h575496cbf7644b9e6oa (cluster.rs:76) See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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853 views

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rust - Unused type parameter on closure argument

This works: struct Foo<T, F> where F: Fn() -> Option<T>, { f: F, } but this gives me compile errors: ... but I'd like to avoid this if possible. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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882 views

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rust - Split a string keeping the separators

Is there a trivial way to split a string keeping the separators? Instead of this: let texte = "Ten. Million. ... use j in the for loop. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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565 views

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rust - Is this error due to the compiler's special knowledge about RefCell?

fn works<'a>(foo: &Option<&'a mut String>, s: &'a mut String) {} fn error<'a>(foo: ... interior mutability container" or something like that? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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741 views

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rust - Is there a way to use custom patterns such as a regex or functions in a match?

I'm writing a toy programming language in Rust. I prototyped the parser logic in Ruby: def rd_tree(chars) loop do ... I want it to stay neat. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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rust - Why is "one type is more general than the other" in an Option containing a closure?

I wrote some code that compiled fine, then I turned T into Option<T> and now I'm getting this error: error ... understand what's going on here? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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792 views

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rust - Why can a trait not construct itself?

This code give me a compilation error: trait IBoo { fn new() -> Box<IBoo>; } while this code compiles ... methods in one interface (trait)? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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853 views

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rust - Why can the lifetimes not be elided in a struct definition?

struct Point { x: u32, y: u32, } struct Line<'a> { start: &'a Point, end: &'a Point, } Here, ... possible in this situation and if so why not? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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955 views

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rust - Is there a way to simplify converting an Option into a Result without a macro?

I have something like this (the real function is Ini::Section::get from rust-ini): impl Foo { ... duplication without this macro implementation? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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861 views

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rust - How to use the Pin struct with self-referential structures?

I'm trying to use the new Pin feature. After reading this blog post, I've started to write some code ... with lifetime parameters with Pin? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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922 views

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rust - How do I define trait bounds on an associated type?

I want to write a function that accepts Iterator of type that has ToString trait. What I have in mind: fn parse ... ("Missing parameter"), } } See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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