Recent questions tagged RUST

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rust - How to get pointer offset in bytes?

While raw pointers in Rust have the offset method, this only increments by the size of the pointer. How can I get ... char *)(var) + offset); See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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845 views

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rust - Modifying chars in a String by index

I wrote a function to titlecase (first letter capitalized, all others lowercase) a borrowed String, but it ended ... String contents by index? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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rust - Returning iterator of a Vec in a RefCell

Given the following struct and impl: use std::slice::Iter; use std::cell::RefCell; struct Foo { bar: ... to return and use bars iterator? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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rust - Why can't I use `&Iterator<Item = &String>` as an iterator?

I have the following function that's supposed to find and return the longest length of a String given an Iterator ... I iterate over my strings? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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rust - How to create a dedicated threadpool for CPU-intensive work in Tokio?

I have a Rust async server based on the Tokio runtime. It has to process a mix of latency-sensitive I/O- ... an isolated CPU pool in Tokio? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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827 views

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rust - How can I cause a panic on a thread to immediately end the main thread?

In Rust, a panic terminates the current thread but is not sent back to the main thread. The solution we are ... achieve Rust behavior in Go). See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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rust - What does `impl` mean when used as the argument type or return type of a function?

I read this code: pub fn up_to(limit: u64) -> impl Generator<Yield = u64, Return = u64> { move || { for ... be implemented in plain Rust or C++? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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811 views

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rust - Why don't Option's Some and None variants need to be qualified?

According to the docs for Option, Option is an enum with variants Some<T> and None. Why is it possible to ... variant, struct or const `Bar` See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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750 views

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rust - What is the canonical way to implement is_empty for Iterator?

I have something that implements std::iter::Iterator and I want to know if there are > 0 elements. What is ... sight what I'm checking here? See Question&Answers more detail:os...

asked Oct 24, 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 get the integer value of an enum?

It is possible to write constructions like this: enum Number { One = 1, Two = 2, Three = 3, Four = 4, } ... to get the value of an enum variant. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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988 views

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rust - Why do I get "panicked at 'not currently running on the Tokio runtime'" when using block_on from the futures crate?

I'm using the example code on elastic search's blog post about their new crate and I'm unable to get ... { block_on(elastic_search_example()); } See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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1.4k views

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rust - How do I serialize or deserialize an Arc<T> in Serde?

I have a struct that contains children of its own type. These children are wrapped in Arcs, and I'm getting ... is more important at this point. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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993 views

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rust - How to check for EOF with `read_line()`?

Given the code below, how can I specifically check for EOF? Or rather, how can I distinguish between "there's ... _) => do_something_else(), } See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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1.1k views

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rust - How to build an Rc<str> or Rc<[T]>?

I'd like to create an Rc<str> because I want reduce the indirection from following the 2 pointers that accessing ... or String to str anyway). See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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918 views

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rust - How can I locate resources for testing with Cargo?

I'm on a project interacting with files, and I would like to use text files to test my work. However tests ... 't find anything attesting it)? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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1.1k views

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rust - Lifetime annotation for closure argument

I'd like to make the following code compile: struct Provider {} impl Provider { fn get_string<'a>(&'a self) -> &'a str ... = |s: &str| { | ^^^ See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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974 views

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rust - How to get a pointer to a containing struct from a pointer to a member?

I have a type: struct Foo { memberA: Bar, memberB: Baz, } and a pointer which I know is a pointer to ... as I know has no offsetof macro. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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918 views

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rust - How can I reborrow a mutable reference without passing it to a function?

I have found a case where manually inlining a function changes the way the borrow-checker treats it, such ... combining all four versions. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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1.3k views

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rust - Getting the error "the trait Sized is not implemented" when trying to return a value from a vector

I am trying to return the values of a vector: fn merge<'a>(left: &'a [i32], right: &'a [i32]) -> [i32] ... I can't find out how to fix this. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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1.1k views

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rust - How to set the thread stack size during compile time?

When attempting to run a program that builds a large clap::App (find the source here), I get a stackoverflow: thread ... -27) (built 2015-04-28) See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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929 views

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rust - Generate sequential IDs for each instance of a struct

I'm writing a system where I have a collection of Objects, and each Object has a unique integral ID. Here' ... number hither and yon. Thoughts? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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876 views

1 answer

rust - Should I use enums or boxed trait objects to emulate polymorphism?

Using the enum Axes to confine Coordinate and Quaternion: #[derive(Clone)] pub enum Axes { Coordinate { x: f64, y ... to use and in what cases. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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680 views

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rust - How can the location of Cargo's configuration directory be overridden?

It seems that the default behavior of Cargo when searching for its configuration directory is to look in ... user-supplied directory instead? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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899 views

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rust - Why doesn't a mutable borrow of self change to immutable?

This code fails the dreaded borrow checker (playground): struct Data { a: i32, b: i32, c: i32, } impl Data ... ? Is there a way around it? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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907 views

1 answer

rust - Is it possible to have Cargo always show warnings?

I'm using watch with cargo, in order to quickly see compile time errors. However, cargo build will only show ... always give me the warnings? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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927 views

1 answer

rust - Does <'a, 'b: 'a> mean that the lifetime 'b must outlive the lifetime 'a?

I want to implement a builder similar to the debug builders defined by the standard library. They are defined ... can I find it documented? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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626 views

1 answer

rust - When is it safe to move a member value out of a pinned future?

I'm writing a future combinator that needs to consume a value that it was provided with. With futures 0.1, ... this operation in a safe manner? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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800 views

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rust - What does an empty set of parentheses mean when used in a generic type declaration?

The Display trait is defined as follows: pub trait Display { fn fmt(&self, &mut Formatter) -> Result<(), Error> ... What is it and its purpose? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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