Function futures::future::join_all

Important traits for JoinAll<F>

impl<F> Future for JoinAll<F> where
    F: Future,  type Output = Vec<<F as Future>::Output>;

pub fn join_all<I>(i: I) -> JoinAll<<I as IntoIterator>::Item> where
    I: IntoIterator,
    <I as IntoIterator>::Item: Future, 

Creates a future which represents a collection of the outputs of the futures given.

The returned future will drive execution for all of its underlying futures, collecting the results into a destination Vec<T> in the same order as they were provided.

This function is only available when the std or alloc feature of this library is activated, and it is activated by default.

See Also

This is purposefully a very simple API for basic use-cases. In a lot of cases you will want to use the more powerful FuturesUnordered APIs, some examples of additional functionality that provides:

• Adding new futures to the set even after it has been started.

• Only polling the specific futures that have been woken. In cases where you have a lot of futures this will result in much more efficient polling.

Examples

#![feature(async_await)]
use futures::future::{join_all};

async fn foo(i: u32) -> u32 { i }

let futures = vec![foo(1), foo(2), foo(3)];

assert_eq!(join_all(futures).await, [1, 2, 3]);