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use crate::stream::TryStreamExt;
use core::pin::Pin;
use futures_core::future::{FusedFuture, Future};
use futures_core::stream::{FusedStream, TryStream};
use futures_core::task::{Context, Poll};
/// Future for the [`try_next`](super::TryStreamExt::try_next) method.
#[derive(Debug)]
#[must_use = "futures do nothing unless you `.await` or poll them"]
pub struct TryNext<'a, St: ?Sized> {
stream: &'a mut St,
}
impl<St: ?Sized + Unpin> Unpin for TryNext<'_, St> {}
impl<'a, St: ?Sized + TryStream + Unpin> TryNext<'a, St> {
pub(super) fn new(stream: &'a mut St) -> Self {
Self { stream }
}
}
impl<St: ?Sized + TryStream + Unpin + FusedStream> FusedFuture for TryNext<'_, St> {
fn is_terminated(&self) -> bool {
self.stream.is_terminated()
}
}
impl<St: ?Sized + TryStream + Unpin> Future for TryNext<'_, St> {
type Output = Result<Option<St::Ok>, St::Error>;
fn poll(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> {
self.stream.try_poll_next_unpin(cx)?.map(Ok)
}
}