Recent questions tagged rust

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rust - How to get an Option's value or set it if it's empty?

I want to get the name if it's not empty or set a new value. How can I do that? #[derive(Debug)] ... in a macro outside of the current crate See Question&Answers more detail:os...

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

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1.2k views

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rust - Performance comparison of a Vec and a boxed slice

I want a function to allocate a basic variable-length "array" (in the generic sense of the word, not necessarily the Rust ... Box::new(sl); } } See Question&Answers more detail:os...

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

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578 views

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rust - How can I co-sort two Vecs based on the values in one of the Vecs?

I have two Vecs that correspond to a list of feature vectors and their corresponding class labels, and I'd like ... it would be much better. See Question&Answers more detail:os...

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

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821 views

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rust - Is the question mark operator ? equivalent to the try! macro?

I am looking for a way to chain the usage of the try! macro in Rust and found this pull request ... macro or are there important differences? 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 read non-blocking from stdin?

Is there a way to check whether data is available on stdin in Rust, or to do a read that returns immediately with the ... ...} // this blocks :( See Question&Answers more detail:os...

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

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672 views

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rust - How can I use a module from outside the src folder in a binary project, such as for integration tests or benchmarks?

My project's path structure is as follows: demo ├── benches │?? └── crypto_bench.rs ├── src │?? ├── main.rs │ ... a project with a main.rs file. 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 - Cannot borrow immutable borrowed content as mutable

I'm trying to develop a message routing app. I've read the official Rust docs and some articles and ... give me the right 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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863 views

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rust - How do I avoid unwrap when converting a vector of Options or Results to only the successful values?

I have a Vec<Result<T, E>> and I want to ignore all Err values, converting it into a Vec<T>. I can do ... Is there a better way to write 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 to initialize the logger for integration tests?

I have a crate with production code in the src directory and integration tests in the tests directory. The ... the tests main function? See Question&Answers more detail:os...

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

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977 views

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rust - Can't borrow File from &mut self (error msg: cannot move out of borrowed content)

use std::fs::File; use std::io::Read; pub struct Foo { maybe_file: Option<File>, } impl Foo { pub fn init( ... ? What do I do to solve it? See Question&Answers more detail:os...

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

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919 views

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rust - How to idiomatically copy a slice?

In Go, copying slices is standard-fare and looks like this: # It will figure out the details to match slice ... better way to copy a slice? 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 to create and write to memory mapped files?

Editor's note: This code example is from a version of Rust prior to 1.0 and the code it uses does not ... correct way to use MemoryMap in Rust? See Question&Answers more detail:os...

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

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621 views

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rust - How can I create a function with a variable number of arguments?

How can I create a function with a variable number of arguments in Rust? Like this Java code: void foo(String.. ... System.out.println(arg); } } See Question&Answers more detail:os...

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

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893 views

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rust - How to print a Vec?

I tried the following code: fn main() { let v2 = vec![1; 10]; println!("{}", v2); } But the ... Does anyone implement this trait for Vec<T>? See Question&Answers more detail:os...

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

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851 views

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rust - What is the equivalent of the join operator over a vector of Strings?

I wasn't able to find the Rust equivalent for the "join" operator over a vector of Strings. I have a ... iterator separated by spaces in Rust? See Question&Answers more detail:os...

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

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1.3k views

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rust - How can I build multiple binaries with Cargo?

I'd like to make a project with a daemon and a client, connecting through a unix socket. A client and a ... unless it's very good practice. See Question&Answers more detail:os...

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

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1.1k views

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rust - What is the syntax for a multiline string literal?

I'm having a hard time figuring out how string syntax works in Rust. Specifically, I'm trying to figure out how to make a multiple line string. See Question&Answers more detail:os...

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

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609 views

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rust - References to traits in structs

I have a trait Foo pub trait Foo { fn do_something(&self) -> f64; } and a struct which references that trait pub ... foo } } fn main() {} See Question&Answers more detail:os...

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

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1.0k views

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rust - Can macros match against constant arguments instead of literals?

Given the macro matching example, this shows how macros can match an argument. I've made very minor changes here to ... be passed to a macro. See Question&Answers more detail:os...

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

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906 views

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rust - Mutable self while reading from owner object

I have one object that owns another. The owned object has a mutating method that depends on non-mutating ... complex logic with the results. See Question&Answers more detail:os...

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

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1.4k views

1 answer

rust - How can I borrow from a HashMap to read and write at the same time?

I have a function f that accepts two references, one mut and one not mut. I have values for f inside ... in comparison with HashMap::get/get_mut See Question&Answers more detail:os...

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

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896 views

1 answer

rust - How do I perform iterator computations over iterators of Results without collecting to a temporary vector?

I'm looking for a way to eliminate the temporary vector allocation in this example: fn doit<T: Iterator<Item ... iterating on the first error. See Question&Answers more detail:os...

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

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737 views

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rust - How to reference private types from public functions in private modules?

I want to group similar functions in a file. Those functions need to return a type which is not public: ... this without making MyStruct public? See Question&Answers more detail:os...

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

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908 views

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rust - Do I have to implement a trait twice when implementing it for both reference and non-reference types?

I want to implement a trait for both a for reference and non-reference type. Do I have to implement the functions twice, ... .hi(); &bar.hi(); } See Question&Answers more detail:os...

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

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867 views

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rust - Can I reassign a mutable slice reference to a sub-slice of itself?

I'm implementing a stack-like structure, where the structure holds a mutable reference to a slice. struct ... interested in more explicitly? See Question&Answers more detail:os...

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

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1.1k views

1 answer

rust - Why can Serde not derive Deserialize for a struct containing only a &Path?

I tried to derive serde::Deserialize for a struct containing a reference to a Path. This yielded an error message ... think this is a bug. See Question&Answers more detail:os...

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

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901 views

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rust - How do I change a function's qualifiers via conditional compilation?

I have a function that is capable of being implemented as a const: #![feature(const_fn)] // My crate ... pub (and other visibility modifiers) See Question&Answers more detail:os...

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

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1.0k views

1 answer

rust - Extend lifetime of variable

I'm trying to return a slice from a vector which is built inside my function. Obviously this doesn't work because ... collect(); v.as_slice() } See Question&Answers more detail:os...

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

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