Recent questions tagged Rust

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rust - Is there a modulus (not remainder) function / operation?

In Rust (like most programming languages), the % operator performs the remainder operation, not the modulus operation. ... a function for that! 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's the difference between `usize` and `u32`?

The documentation says usize is Operations and constants for pointer-sized unsigned integers. In most cases, I can ... which are so alike. 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 do I parse a JSON File?

I have this so far in my goal to Parse this JSON data in Rust: extern crate rustc_serialize; use rustc_serialize:: ... key from it, like Age. 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 get assembly output from building with Cargo?

While I've seen docs on using rustc directly to output assembly, having to manually extract commands used by ... writes out assembly files? 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 - Does cargo install have an equivalent update command?

I'd like to update a package that I used cargo install to globally install packages, such as rustfmt or racer. ... . Is there an update command? 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 I can mutate a struct's field from a method?

I want to do this: struct Point { x: i32, y: i32, } impl Point { fn up(&self) { self.y + ... ^^ cannot mutably borrow field of immutable binding 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 - error[E0554]: #![feature] may not be used on the stable release channel Couldn't install racer using cargo

I'm trying to install racer using cargo, so I executed the command cargo install racer in the terminal and it ... cargo? Am I missing anything? 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 - Cargo build hangs with " Blocking waiting for file lock on the registry index" after building parity from source

I followed the readme instructions for building Parity from source and then I execute this command: cargo build --release and ... I'm on a Mac. 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 - Working with c_void in an FFI

I am struggling with passing a struct through an FFI that accepts void and reading it back on the other end. ... the struct to void and back. 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 generate statically linked executables?

I am trying to create a static executable with Rust. I am not trying to statically link a particular library, ... agrees is statically linked). See Question&Answers more detail:os...

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

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843 views

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rust - Why do I get a conflicting implementations error when specializing a trait?

I'm not sure that I understand why this code won't compile. It seems like the new "vector" Mul specialization ... for `&Matrix<_, RowMajor>` 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 - Is it possible to initialize a variable from an environment variable at compilation time?

I would like to initialize a variable during compilation time. For example, I would like to initialize the variable ... it possible to do 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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1.3k views

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rust - "cannot move out of borrowed context" and "use of moved value"

I have the following code: pub enum Direction { Up, Right, Down, Left, None } struct Point { y: i32, x: ... a working variant of what I pasted? 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 - Create a generic struct with Option<T> without specifying T when instantiating with None

I have a struct Foo<T> where T: // ... some complex trait bound ... { a: Bar, b: Option<T>, } ... not found such a type in the documentation. 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 - What does "expected type `()`" mean on a match expression?

I'm rewriting a simple TCP based server to experiment with Rust. It should retrieve input of an client and ... explain didn't help me either 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 to POST a file using reqwest?

The documentation for reqwest v0.9.18 shows the following example of posting a file: let file = fs::File:: ... method for sending a file? See Question&Answers more detail:os...

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

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972 views

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rust - How do I call Peekable::next based on the result of Peekable::peek?

use std::iter::Peekable; pub trait AdvanceWhile<I: Iterator> { fn advance_while<P>(&mut self, predicate: P) ... | - first borrow ends 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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995 views

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rust - How to idiomatically iterate one half of an array and modify the structure of the other?

What is the idiomatic way to iterate (read) over the first half of the vector and change the structure of the second half of ... 1); j--; } } } See Question&Answers more detail:os...

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

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1.5k views

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rust - Temporary value dropped while borrowed, but I don't want to do a let

I'm doing something like this: fn main() { //[1, 0, 0, 0, 99]; // return [2, 0, 0, 0, 99] // ... slice I want to test! Is the let really needed? See Question&Answers more detail:os...

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

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963 views

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rust - What happened to std::num::Primitive?

I found Primitive through Google but it appears to be from a pre-beta version and my compiler (beta 3) ... hasn't thrown up anything promising See Question&Answers more detail:os...

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

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950 views

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rust - Why do I get "expected struct file1::A found struct file2::A" error when using a struct in multiple files?

I am trying to share a struct between two files, but I am getting an error. I have the ... struct 'LoginService::Login:UserLoginResponse' 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 do I share a generic struct between threads using Arc<Mutex<MyStruct<T>>>?

I have some mutable state I need to share between threads. I followed the concurrency section of the Rust book, ... way to accomplish this is. 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 - error[E0597]: borrowed value does not live long enough in While loop

I am really new to Rust, I am having trouble solving this error, but it only happens if I comment out ... ` dropped here while still borrowed See Question&Answers more detail:os...

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

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832 views

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rust - How do I pass each element of a slice as a separate argument to a variadic C function?

I'm building a Redis Module in Rust. I've found some good examples, but I'm stuck when dealing with interfacing a C ... ... and so on */). See Question&Answers more detail:os...

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

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921 views

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rust - Is it possible to specialize on a static lifetime?

I want to specialize &'static str from &'a str: use std::borrow::Cow; struct MyString { inner: Cow<' ... something that Rust will ever support? See Question&Answers more detail:os...

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

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1.5k views

1 answer

rust - How can I implement Deref for a struct that holds an Rc<Refcell<Trait>>?

My goal is to delegate method calls against my struct to a Trait's methods, where the Trait object is inside ... the Trait object in each call. 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

1 answer

rust - Why do I get "the type parameter is not constrained" when creating a blanket implementation for a closure trait (Fn)?

The compiler allows me to write blanket implementation a function like this: trait Invoke { type S; type E; fn fun(&mut ... E> { self(arg) } } See Question&Answers more detail:os...

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

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873 views

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rust - Why do I get the error "the type of this value must be known in this context" when parsing a string to a number?

I'm not trying to write sophisticated code, I just want to understand what is (or is not) going on here ... break the operation into two chunks. See Question&Answers more detail:os...

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

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