map() map()maps each element in the current iterator to an element in the new iterator. It takes a closure as the parameter. The closure takes one element in the current iterator and returns a value that becomes an element in the new iterator. foriin(0..10).map(|x| x *2) {println!
I'm not sure if this is really a bug (or perhaps a duplicate issue of another bug). However, I can't see any reason why this shouldn't work. I tried this code: #![feature(async_closure)] fn assert_send<T: Send>(_: T) {} #[derive(Clone)] ...
Full example async fn go<'a>(value: &'a i32) { let closure = async |scope: ScopeRef<'_, 'a>| { let _future1 = scope.spawn(async { let _v = *value; }); }; } yields error: lifetime may not live long enough --> examples/repro.rs:52:63 | 52 ...
Rust 有跟 JavaScript 类似的 async/await 语法。给函数加一个async,可以使其返回值从T变成impl Future<Output = T>,例如: fnregular_fn()->String{"I'm a regular function".to_owned()}asyncfnasync_fn()->String{// 实际上是 impl Future<Output = String>"I'm an async function".to_owned()} ...
move- make a closure take ownership of all its captures mut- denote mutability in references, raw pointers, or pattern bindings pub- denote public visibility in struct fields,implblocks, or modules ref- bind by reference return- return from function ...
NoteCode Suggestions referred to thereqwest::blocking::getfunction for the// Fetch URL contentcomment instruction. Thereqwestcratename is intentional and not a typo. It provides a convenient, higher-level HTTP client for async and blocking requests. ...
use axum::Json; use axum::extract::Request; use axum::http::header::HeaderMap; use axum::http::StatusCode; use serde::{Serialize, Deserialize}; use serde_json::{Value, json}; #[derive(Deserialize)] pub struct Info { name: String, age: u8, } pub async fn post_foo(info:Json<In...
While future combinators make it possible to write very efficient code, they can be difficult to use in some situations because of the type system and the closure-based interface. For example, consider code like this: fnexample(min_len:usize) -> impl Future<Output = String> {async_read_fi...
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// The `name` parameter is only valid if `has_name` is `true`. has_name: bool, name: u32, ); } #[inline] unsafe fn invoke_mapping_callback(mapping: &Mapping) { let generated_line = mapping.generated_line; let generated_column = mapping.generated_column; ...