Struct futures::stream::Once

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#[must_use = "streams do nothing unless polled"]
pub struct Once<Fut> { /* fields omitted */ }

[−] Expand description

A stream which emits single element and then EOF.

This stream will never block and is always ready.

Trait Implementations

impl<Fut> Unpin for Once<Fut> where     Fut: Unpin,

impl<Fut> Debug for Once<Fut> where     Fut: Debug,

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fn fmt(&self, f: &mut Formatter) -> Result<(), Error>

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Formats the value using the given formatter.

impl<Fut> Stream for Once<Fut> where     Fut: Future,

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type Item = <Fut as Future>::Output

Values yielded by the stream.

fn poll_next(     self: PinMut<Once<Fut>>,     cx: &mut Context ) -> Poll<Option<<Fut as Future>::Output>>

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Attempt to pull out the next value of this stream, registering the current task for wakeup if the value is not yet available, and returning None if the stream is exhausted.