[][src]Function futures::future::join_all

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

Notable traits for JoinAll<F>

impl<F> Future for JoinAll<F> where
    F: Future
type Output = Vec<<F as Future>::Output, Global>;
    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 FuturesOrdered APIs, or, if order does not matter, FuturesUnordered.

Some examples for additional functionality provided by these are:

  • 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.


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]);