Function futures::future::select_ok

Important traits for SelectOk<Fut>

impl<Fut> Future for SelectOk<Fut> where
    Fut: Unpin + TryFuture,  type Output = Result<(<Fut as TryFuture>::Ok, Vec<Fut>), <Fut as TryFuture>::Error>;

pub fn select_ok<I>(iter: I) -> SelectOk<<I as IntoIterator>::Item> where
    I: IntoIterator,
    <I as IntoIterator>::Item: TryFuture,
    <I as IntoIterator>::Item: Unpin, 

Creates a new future which will select the first successful future over a list of futures.

The returned future will wait for any future within iter to be ready and Ok. Unlike select_all, this will only return the first successful completion, or the last failure. This is useful in contexts where any success is desired and failures are ignored, unless all the futures fail.

Panics

This function will panic if the iterator specified contains no items.