[−][src]Function futures::future::join_all
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]);