Macro futures_util::join [−][src]
Polls multiple futures simultaneously, returning a tuple of all results once complete.
While join!(a, b)
is similar to (a.await, b.await)
,
join!
polls both futures concurrently and therefore is more efficient.
This macro is only usable inside of async functions, closures, and blocks.
It is also gated behind the async-await
feature of this library, which is
activated by default.
Examples
use futures::join; let a = async { 1 }; let b = async { 2 }; assert_eq!(join!(a, b), (1, 2)); // `join!` is variadic, so you can pass any number of futures let c = async { 3 }; let d = async { 4 }; let e = async { 5 }; assert_eq!(join!(c, d, e), (3, 4, 5));