rust

问题 I'm using git2-rs to implement some standard git functionality in a Rust application. I've been reading up on git internals and understand that at a high level "git pull" is a "git fetch" followed by a "git merge", but am still having trouble understanding how to make it work with git2-rs. There is a discussion on an issue here where it's agreed that a git2-rs "git pull" example would be nice, but one was never created. There is an example of doing a hard reset in that discussion, but I want

问题 My rust program is managing memory for a 2d html canvas context, and I'm trying to hit ~60fps. I can calculate the delta between each frame easily, and it turns out to be roughly ~5ms. I'm unclear on how to put my Rust webassembly program to sleep for the remaining 11ms. One option would be to have JavaScript call into Rust on every requestAnimationFrame and use that as the driver, but I'm curious to keep it all in Rust if possible. I'm effectively looking for the Rust equivalent of

问题 This question already has an answer here : Generating documentation in macros (1 answer) Closed 4 years ago . I tried to do #![deny(missing_docs)] in Rust. And I found that /// comments are just ignored when a function is created with a macro like this: /// docs py_module_initializer!(libx, initlibx PyInit_libx |py, m| { Ok(()) }); with: error: missing documentation for a function 113 | py_module_initializer!(libx initlibx PyInit_libx |py, m| { | ^ I thought a macro will just add a function

问题 This question already has an answer here : Generating documentation in macros (1 answer) Closed 4 years ago . I tried to do #![deny(missing_docs)] in Rust. And I found that /// comments are just ignored when a function is created with a macro like this: /// docs py_module_initializer!(libx, initlibx PyInit_libx |py, m| { Ok(()) }); with: error: missing documentation for a function 113 | py_module_initializer!(libx initlibx PyInit_libx |py, m| { | ^ I thought a macro will just add a function

问题 I'm using git2-rs to implement some standard git functionality in a Rust application. I've been reading up on git internals and understand that at a high level "git pull" is a "git fetch" followed by a "git merge", but am still having trouble understanding how to make it work with git2-rs. There is a discussion on an issue here where it's agreed that a git2-rs "git pull" example would be nice, but one was never created. There is an example of doing a hard reset in that discussion, but I want

问题 Consider the following code: let u: Vec<u8> = (64..74).collect(); let v: Vec<u8> = u.iter().map(|i| i + 1).collect(); u was not moved, therefore v was inevitably newly allocated. But if I do the following: let w: Vec<u8> = u.into_iter().map(|i| i + 1).collect(); u was moved and w is the name of its transformation. Here is some pseudo-code representing what I mean: mark u as "moved" for i = 0..10: u[i] += 1 w = u There is (in my opinion) no need for a new allocation, since we map a type to

问题 My rust program is managing memory for a 2d html canvas context, and I'm trying to hit ~60fps. I can calculate the delta between each frame easily, and it turns out to be roughly ~5ms. I'm unclear on how to put my Rust webassembly program to sleep for the remaining 11ms. One option would be to have JavaScript call into Rust on every requestAnimationFrame and use that as the driver, but I'm curious to keep it all in Rust if possible. I'm effectively looking for the Rust equivalent of

问题 My rust program is managing memory for a 2d html canvas context, and I'm trying to hit ~60fps. I can calculate the delta between each frame easily, and it turns out to be roughly ~5ms. I'm unclear on how to put my Rust webassembly program to sleep for the remaining 11ms. One option would be to have JavaScript call into Rust on every requestAnimationFrame and use that as the driver, but I'm curious to keep it all in Rust if possible. I'm effectively looking for the Rust equivalent of

问题 I made a wrapper around a C library which creates a device that you must explicitly close. Writing the raw FFI functions was easy, but how do I make it ergonomic Rust in a higher level wrapper? Specifically, should I be doing it the RAII style and only using Drop to ensure the close is called when it goes out of scope, instead of exposing the close() method to the caller? Which way is the most idiomatic in Rust? There are basically 3 options: Thin wrapper that requires the same close() calls

问题 I have an iterator iter ; is it possible to convert it into an iterator that iterates over each Nth element? Something like iter.skip_each(n - 1) ? 回答1: As of Rust 1.26, there is the Iterator::step_by method in the standard library: Basic usage: let a = [0, 1, 2, 3, 4, 5]; let mut iter = a.iter().step_by(2); assert_eq!(iter.next(), Some(&0)); assert_eq!(iter.next(), Some(&2)); assert_eq!(iter.next(), Some(&4)); assert_eq!(iter.next(), None); 回答2: As Dogbert said, use itertools' step. You are