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>
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use core::pin::Pin; use futures_core::stream::FusedStream; use futures_core::future::{Future, FusedFuture}; use futures_core::task::{Context, Poll}; use crate::stream::StreamExt; /// 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 } } }