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Only implement the DoubleEndedStream for once when the flag is on

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Felipe Sere 2019-11-28 21:52:48 +01:00
parent 8e5dedec34
commit b0038e11be
1 changed files with 4 additions and 1 deletions
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5
src/stream/once.rs
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@ -4,7 +4,9 @@ use pin_project_lite::pin_project;
use crate::stream::Stream; use crate::stream::Stream;
use crate::task::{Context, Poll}; use crate::task::{Context, Poll};
use crate::stream::double_ended_stream::DoubleEndedStream;
#[cfg(feature = "unstable")]
use crate::stream::DoubleEndedStream;
/// Creates a stream that yields a single item. /// Creates a stream that yields a single item.
/// ///
@ -48,6 +50,7 @@ impl<T> Stream for Once<T> {
} }
} }
#[cfg(feature = "unstable")]
impl <T> DoubleEndedStream for Once<T> { impl <T> DoubleEndedStream for Once<T> {
fn poll_next_back(self: Pin<&mut Self>, _cx: &mut Context<'_>) -> Poll<Option<Self::Item>> { fn poll_next_back(self: Pin<&mut Self>, _cx: &mut Context<'_>) -> Poll<Option<Self::Item>> {
Poll::Ready(self.project().value.take()) Poll::Ready(self.project().value.take())