diff options
Diffstat (limited to 'vendor/futures-util/src/stream/try_stream/try_collect.rs')
-rw-r--r-- | vendor/futures-util/src/stream/try_stream/try_collect.rs | 52 |
1 files changed, 52 insertions, 0 deletions
diff --git a/vendor/futures-util/src/stream/try_stream/try_collect.rs b/vendor/futures-util/src/stream/try_stream/try_collect.rs new file mode 100644 index 000000000..5d3b3d766 --- /dev/null +++ b/vendor/futures-util/src/stream/try_stream/try_collect.rs @@ -0,0 +1,52 @@ +use core::mem; +use core::pin::Pin; +use futures_core::future::{FusedFuture, Future}; +use futures_core::ready; +use futures_core::stream::{FusedStream, TryStream}; +use futures_core::task::{Context, Poll}; +use pin_project_lite::pin_project; + +pin_project! { + /// Future for the [`try_collect`](super::TryStreamExt::try_collect) method. + #[derive(Debug)] + #[must_use = "futures do nothing unless you `.await` or poll them"] + pub struct TryCollect<St, C> { + #[pin] + stream: St, + items: C, + } +} + +impl<St: TryStream, C: Default> TryCollect<St, C> { + pub(super) fn new(s: St) -> Self { + Self { stream: s, items: Default::default() } + } +} + +impl<St, C> FusedFuture for TryCollect<St, C> +where + St: TryStream + FusedStream, + C: Default + Extend<St::Ok>, +{ + fn is_terminated(&self) -> bool { + self.stream.is_terminated() + } +} + +impl<St, C> Future for TryCollect<St, C> +where + St: TryStream, + C: Default + Extend<St::Ok>, +{ + type Output = Result<C, St::Error>; + + fn poll(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> { + let mut this = self.project(); + Poll::Ready(Ok(loop { + match ready!(this.stream.as_mut().try_poll_next(cx)?) { + Some(x) => this.items.extend(Some(x)), + None => break mem::replace(this.items, Default::default()), + } + })) + } +} |