Sha256: 0094eccc96cfe78d9b6d0a9bdb82cada8fb7929770a3ac00ffcb5441d7dc4f51
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Versions: 26
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Stored size: 1.25 KB
Contents
use crate::stream::StreamExt;
use core::pin::Pin;
use futures_core::future::{FusedFuture, Future};
use futures_core::ready;
use futures_core::stream::FusedStream;
use futures_core::task::{Context, Poll};
/// Future for the [`select_next_some`](super::StreamExt::select_next_some)
/// method.
#[derive(Debug)]
#[must_use = "futures do nothing unless you `.await` or poll them"]
pub struct SelectNextSome<'a, St: ?Sized> {
stream: &'a mut St,
}
impl<'a, St: ?Sized> SelectNextSome<'a, St> {
pub(super) fn new(stream: &'a mut St) -> Self {
Self { stream }
}
}
impl<St: ?Sized + FusedStream + Unpin> FusedFuture for SelectNextSome<'_, St> {
fn is_terminated(&self) -> bool {
self.stream.is_terminated()
}
}
impl<St: ?Sized + FusedStream + Unpin> Future for SelectNextSome<'_, St> {
type Output = St::Item;
fn poll(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> {
assert!(!self.stream.is_terminated(), "SelectNextSome polled after terminated");
if let Some(item) = ready!(self.stream.poll_next_unpin(cx)) {
Poll::Ready(item)
} else {
debug_assert!(self.stream.is_terminated());
cx.waker().wake_by_ref();
Poll::Pending
}
}
}
Version data entries
26 entries across 26 versions & 1 rubygems