Struct futures_util::stream::PollFn

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

[−] Expand description

A stream which adapts a function returning Poll.

Created by the poll_fn function.

Trait Implementations

impl<F: Debug> Debug for PollFn<F>

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

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Formats the value using the given formatter.

impl<F> Unpin for PollFn<F>

impl<T, F> Stream for PollFn<F> where     F: FnMut(&mut Context) -> Poll<Option<T>>,

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type Item = T

Values yielded by the stream.

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

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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.