Struct futures_util::stream::Select

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#[must_use = "streams do nothing unless polled"]
pub struct Select<St1, St2> { /* fields omitted */ }

[−] Expand description

An adapter for merging the output of two streams.

The merged stream will attempt to pull items from both input streams. Each stream will be polled in a round-robin fashion, and whenever a stream is ready to yield an item that item is yielded.

After one of the two input stream completes, the remaining one will be polled exclusively. The returned stream completes when both input streams have completed.

Trait Implementations

impl<St1: Debug, St2: Debug> Debug for Select<St1, St2>

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

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Formats the value using the given formatter.

impl<St1: Unpin, St2: Unpin> Unpin for Select<St1, St2>

impl<St1, St2> Stream for Select<St1, St2> where     St1: Stream,     St2: Stream<Item = St1::Item>,

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type Item = St1::Item

Values yielded by the stream.

fn poll_next(self: PinMut<Self>, cx: &mut Context) -> Poll<Option<St1::Item>>

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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.