Function futures::future::try_join_all

Important traits for TryJoinAll<F>

impl<F> Future for TryJoinAll<F> where
    F: TryFuture,  type Output = Result<Vec<<F as TryFuture>::Ok>, <F as TryFuture>::Error>;

pub fn try_join_all<I>(i: I) -> TryJoinAll<<I as IntoIterator>::Item> where
    I: IntoIterator,
    <I as IntoIterator>::Item: TryFuture, 

Creates a future which represents either a collection of the results of the futures given or an error.

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.

If any future returns an error then all other futures will be canceled and an error will be returned immediately. If all futures complete successfully, however, then the returned future will succeed with a Vec of all the successful results.

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

Examples

#![feature(async_await)]
use futures::future::{self, try_join_all};

let futures = vec![
    future::ok::<u32, u32>(1),
    future::ok::<u32, u32>(2),
    future::ok::<u32, u32>(3),
];

assert_eq!(try_join_all(futures).await, Ok(vec![1, 2, 3]));

let futures = vec![
    future::ok::<u32, u32>(1),
    future::err::<u32, u32>(2),
    future::ok::<u32, u32>(3),
];

assert_eq!(try_join_all(futures).await, Err(2));