rust | 易学教程

How do I convert a Vector of bytes (u8) to a string

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问题 I am trying to write simple TCP/IP client in Rust and I need to print out the buffer I got from the server. How do I convert the u8 vector to a String for printing? 回答1: To convert a slice of bytes to a string slice (assuming a UTF-8 encoding): use std::str; // // pub fn from_utf8(v: &[u8]) -> Result<&str, Utf8Error> // // Assuming buf: &[u8] // fn main() { let buf = &[0x41u8, 0x41u8, 0x42u8]; let s = match str::from_utf8(buf) { Ok(v) => v, Err(e) => panic!("Invalid UTF-8 sequence: {}", e), }

What is a crate attribute and where do I add it?

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问题 In order to get a feel for how Rust works, I decided to look at a little terminal-based text editor called Iota. I cloned the repository and ran cargo build only to be told: error: *if let* syntax is experimental help: add #![feature(if_let)] to the crate attributes to enable Where am I supposed to add #![feature(if_let)] to the crate attributes? 回答1: A crate attribute is an attribute ( #[...] ) that applies to the enclosing context ( #![...] ). This attribute must be added to the top of your

Rust 1.0.0-alpha 即将释出

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【推荐】2019 Java 开发者跳槽指南.pdf(吐血整理) >>> Rust 1.0.0-alpha 即将释出发行说明和参考资料： Version 1.0.0-alpha (January 2015) ---------------------------------- * ~2300 changes, numerous bugfixes * Highlights * The language itself is considered feature complete for 1.0, though there is a significant amount of cleanup and bugfixes remaining. * Nearly 50% of the public API surface of the standard library has been declared 'stable'. Those interfaces will not change. * Most crates that are not `std` have been moved out of the Rust distribution into the Cargo ecosystem so they can evolve separately and don't need to be

Rust 1.0.0-alpha 释出

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【推荐】2019 Java 开发者跳槽指南.pdf(吐血整理) >>> 今天Rust 1.0.0-alpha 按计划如期释出。有几个地方或以帮助大家感受这一门语言 1、官方提供的《 A 30-minute Introduction to Rust 》。可以在30分钟内对Rust语言有基本的了解。 2、官方出版的电子书《 The Rust Programming Language 》。官方首次发布该电子书，也是官方发布的第一本编程书，相比之前为新手准备的Guide，该书更有层次，更全面，还有很多编程实践在里面，可以更好地帮助新手系统的了解语言的全貌。【推荐】 3、由Steve Klabnik维护的《 Rust by Example 》。它为Rust的每功能点提供一个示例程序，并且由浅入深、分门别类的组织在一起，学完一个示例可以按下一步，继续学习第二个示例，为新手提供了一个良好的实践向导。此外它还提供了一个可以做实验的沙盒，用户不用安装Rust也可以写代码，做实验。【推荐】详细请看：http://doc.rust-lang.org/1.0.0-alpha/ 来源： oschina 链接： https://my.oschina.net/u/10896/blog/365726

Fighting with / not understanding Rust borrow checker

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问题 I started writing Rust code a few days ago, and just now had my first encounter with the borrow checker. #[derive(Clone, Eq, Debug, PartialEq)] pub struct Vm<'a> { instructions: Rc<InstructionSequence>, pc: usize, stack: Vec<Value<'a>>, frames: Vec<Frame<'a>>, } impl<'a> Vm<'a> { pub fn run(&'a mut self) { loop { let instruction = self.instructions.get(self.pc).unwrap(); match instruction { &Instruction::Push(ref value) => { let top_activation = &mut self.frames.last_mut().unwrap().activation

How can I make a window override-redirect with glutin?

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问题 I'm creating a program that uses glutin, and I want to provide a command-line flag to make the window override-redirect so it can be used as a desktop wallpaper for certain window managers that don't support the desktop window type. I've done a lot of research and managed to cobble together a block of code that I thought would work, using the provided xlib display and window from glutin. Here is my existing code: unsafe { use glutin::os::unix::WindowExt; let x_connection = std::sync::Arc::

What does “expected value, found trait” mean?

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问题 I am trying to build a scene manager that lets you push scenes onto a stack. When each scene is popped off the stack, it is run until stopped and then we repeat. An example is a menu in a game; which is one scene. When you close it, the game map behind it is another scene. pub trait Scene { fn start(&mut self) {} fn update(&mut self) {} fn stop(&mut self) {} fn is_active(&self) -> bool { return false; } } pub struct SceneManager { scenes: Vec<Box<Scene>>, } impl SceneManager { fn new<T>(scene

我是如何从Java转型为Go区块链工程师

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【推荐】2019 Java 开发者跳槽指南.pdf(吐血整理) >>> 我是如何从Java转型为Go区块链工程师本文来自于一个比原链核心开发的陈述前言本人在加入比原链之前一直是做Java开发的，当初看到Go还有点犹豫，还怕过不了面试，结果是否掌握一门语言的考量确实没那么高，我顺利入职比原链，并在半个月内很快掌握Go并能够进行核心项目的开发。 Java语言在较大的成熟项目上具有优势，但是在区块链开发中确实会有很多短处，比如在协程处理上，还有Java语言本身不够灵活等等，当然选择使用Go主要是因为其在区块链的流行程度。区块链的流行语言在区块链公链的开发圈子里，我们找到了一些流行的编程语言，有C++、Golang、Python和最近新起的Rust等等。稍微对比较有名的项目采用的编程语言做个统计，如下图：老一代的公链，比如Bitcoin，Litcoin一般使用C/C++较多（我们看看那个时间，当时Go还没起来呢），新一代的公链比如以太坊，联盟链翘楚超级账本，开始较多使用Go语言，当然我们看到Rust的发展势头也很猛，近两年的很多公链比如波卡，Grin都开始采用Rust语言开发了。 Go语言的优势部署简单 Go 编译生成的是一个静态可执行文件，除了 glibc 外没有其他外部依赖。这让部署变得异常方便：目标机器上只需要一个基础的系统和必要的管理、监控工具

Sending channel signal from a closure

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问题 I'm trying to send a signal from within a closure, using the following code. use std::thread; use std::sync::mpsc::channel; fn main() { let (tx, rx) = channel(); let t1 = thread::spawn(move || { watch(|x| tx.send(x)); }); let t2 = thread::spawn(move || { println!("{:?}", rx.recv().unwrap()); }); let _ = t1.join(); let _ = t2.join(); } fn watch<F>(callback: F) where F : Fn(String) { callback("hello world".to_string()); } However, it fails compiling raising the following error: src/test.rs:8:19

2019年，又是一个成长年！

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【推荐】2019 Java 开发者跳槽指南.pdf(吐血整理) >>> 大胡子是我特别佩服的一位老师，第一次知道他是17年偶尔一次线上讲座，具体题目忘记了，内容大概是关于"技术人如何赚钱"，很real，告诉一些晚辈如何赚钱，以及拥有一些赚钱思维，我觉得这个真的很酷。后来才了解到他的疯人院和星球，所以立马入会，所幸会费不是很高(这要是再高个几百的，当时的我是肯定不会去"割韭菜"社群)。不过，在这两年里，虽然不曾在社群发表自己的观点，但是通过群里各种大牛、前辈们的探讨，在加上自己的思考，也的确让自己再技术之外成长了很多，所以，在这里我向大家极力推荐大胡子老师，他的公众号是姜胡说 . 年初了，总该总结总结过去一年的成长和收获，也该去梳理梳理新一年的征程如何走下去，这里有一篇胡子老师的文章，觉得很有意思，感兴趣的可以去仔细读读早知道这个，我至少可以少奋斗3年，虽然有点标题档了，但不妨碍这依然是一篇值得看和值得思考的文章. 以下摘录几个观点，用于鞭策自己: 1.Stay hungry,Stay foolish Stay hungry,Stay foolish! 是乔布斯老爷子在斯坦福大学大学演讲时结尾的一句话，翻译过来即为"求知若饥，虚心若愚"。记得那个时候我还在上大学，乔老爷子的自传以及演讲都那么激动人心，我还曾经将 Stay hungry,Stay foolish!

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