loop,无限循环 fn find_char(s :&[char], c: char) -> usize { let mut i = 0; let len = loop { if s[i] == c { break i; // 退出循环,并返回值 } i += 1; }; len } let s = ['R', 'U', 'N', 'O', 'O', 'B']; let index = find_char(&s, 'O'); println!
enum Void {} // example 1 impl FromStr for String { type Err = Void; fn from_str(s: &str) -> Result<String, Self::Err> { Ok(String::from(s)) } } // example 2 fn run_server() -> Result<Void, ConnectionError> { loop { let (request, response) = get_request()?; let ...
egui是一个即时模式的GUI库，这意味着它将在每一帧重新渲染所有内容。他们在这里解释了这是如何工作的。
fn main() { let n = 13; let big_n = if ( n < 10 && n > -10 ){ 10 * n }else { n / 2; }; assert_eq!(big_n, 6); } ``` ### 循环表达式 rust中包括三种循环表达式: while, loop和for ... in 表达式。 ```rust fn main() { for n in 1..101 { if n % 15 == ...
use std::thread;use std::time::Duration;fnmain(){// 创建一个线程Aletnew_thread=thread::spawn(move||{// 再创建一个线程Bthread::spawn(move||{loop{println!("I am a new thread.");}})});// 等待新创建的线程执行完成new_thread.join().unwrap();println!("Child thread is finish!");/...
Rust loop An infinite loop is created with theloopkeyword. The loop is terminated with thebreakkeyword. main.rs fn main() { let mut i = 0; loop { println!("falcon"); i += 1; if i == 5 { break; } } } In the example, we print a word five times. ...
slot:Cell<Option<Runnable>>,/// How many times in a row tasks have been taked from the slot rather than the queue.slot_runs:Cell,}fnmain_loop(){loop{matchfind_runnable(){Some(task)=>task.run();None=>{// 实际上,这里根据空循环的次数,会陷入睡眠状态或出让CPU资源,直到新的task来唤醒。
除了这两个结构体,utils.rs文件还包含了一些常量和函数。例如,函数spin_loop()提供了一个简单的忙等待函数,用于空循环等待。函数spin_loop_hint()提供了一个具有优化提示(hint)的忙等待函数,用于告诉CPU当前线程正在自旋等待。 总的来说,rust/library/std/src/sync/mpmc/utils.rs文件中的代码提供了一些通用的工...
Rust array loop With a for loop, we can easily loop over the elements of the array. main.rs fn main() { let vals = [1, 2, 3, 4, 5]; for e in vals { println!("{e}"); } let n = vals.len(); for i in 0..n { ...
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