Futures低調發佈0.3.1正式版，全面支持async/await

• 2019 年 11 月 14 日
• 筆記

無需Tokio/Async-std,自帶Runtime。代碼庫的參考文檔比較完善，只是缺少應用指南。下面是一段測試代碼：

use futures::executor::block_on;  use futures::future::{join_all, pending, select_all};  use futures::prelude::*;    async fn a(a: i32, b: i32) -> i32 {      a + b  }    async fn b(a: i32, b: i32) -> i32 {      a - b  }    async fn c(a: i32, b: i32) -> i32 {      pending().await  }    fn main() {      let r = block_on(async {          println!("{}", a(1, 2).await);          println!("{}", b(1, 2).await);            async fn foo(i: u32) -> u32 {              i * 10          }            let futures = vec![foo(1), foo(2), foo(3)];          let all_finished = join_all(futures).await;          println!("{:?}", all_finished);            // let first_finished = select_all(futures).await;          // println!("{:?}", first_finished);            "block_on result"      });      println!("{}", r)  }