asyncfnget_two_sites_async() {// Create two different "futures" which, when run to completion, 创建两个不同的`future`,你可以把`future`理解为未来某个时刻会被执行的计划任务// will asynchronously download the webpages. 当两个`future`被同时执行后,它们将并发的去下载目标页面letfuture_one=downloa...
Code #![allow(dead_code)] struct Foo<'static>(&'static u32); impl<'static> Foo<'static> { async fn foo() {} } fn main(){} Meta rustc --version --verbose: rustc 1.85.0-nightly (7442931d4 2024-11-30) binary: rustc commit-hash: 7442931d49b1...
async fn main() {报错 `main` function is not allowed to be `async` [dependencies] tokio = { version = "0.3", features = ["macros", "sync"] } #[tokio::main] main 又报错The #[tokio::main] macro requires rt or rt-multi-thread. 换成 tokio = { version = "1.24.2", features ...
AI代码解释 pub struct StrSplit{remainder:&str,delimiter:&str,}impl StrSplit{pub fnnew(haystack:&str,delimiter:&str)->Self{Self{remainder:haystack,delimiter,}}}impl IteratorforStrSplit{type Item=&str;fnnext(&mut self)->Option<Self::Item>{ifletSome(next_delim)=self.remainder.find(self.delim...
*/fnmain(){// 此处无法直接测试,需要在 C 语言环境中编译并调用} 解释:首先,我们在 Rust 代码中定义了一个名为rust_add的函数,该函数接受两个i32类型的参数,并返回它们的和。为了让 C 语言可以调用这个函数,我们需要使用#[no_mangle]属性来禁止编译器对函数名进行改写。然后,我们使用pub extern "C"关键字...
调整如下fn append_string(dst: &mut String, data: &str) { dst.push_str(data);} fn test...
struct S { map: HashMap, def: String }impl S {fn ensure_has_entry(&mut self, key: i64) {// Doesn't compile with Rust 2018:self.map.entry(key).or_insert_with(|| self.def.clone());// | --- --- ^^ --- second borrow occurs...// | | | |// | | ...
rust 中的错误类型,位于 std::io::ErrorKind 下: pubenumErrorKind{ /// An entity was not found, often a file. #[stable(feature ="rust1", since ="1.0.0")] NotFound, /// The operation lacked the necessary privileges to complete. ...
fn f<T: Into<MyType>>(t: T) -> MyType { t.into } letx = f(b"bytes"); lety = f("string"); 左右滑动查看完整代码 Haskell程序员可能会发现这个问题很熟悉:它看起来可疑地类似于可怕的单态限制!不幸的是,rustc没有NoMonomorphismRestriction字段。
// Our executor takes any object which implements the `Future` traitfn block_on<F:Future>(mut future:F)->F::Output{// the first thing we do is to construct a `Waker` which we'll pass on to// the `reactor` so it can wake us up when an event is ready.letmywaker=Arc::new(My...