1 files changed, 78 insertions, 0 deletions
diff --git a/vendor/futures-util-0.3.14/src/stream/stream/fuse.rs b/vendor/futures-util-0.3.14/src/stream/stream/fuse.rs
new file mode 100644
index 00000000..e1d8c122
--- /dev/null
+++ b/vendor/futures-util-0.3.14/src/stream/stream/fuse.rs
@@ -0,0 +1,78 @@
+use core::pin::Pin;
+use futures_core::ready;
+use futures_core::stream::{FusedStream, Stream};
+use futures_core::task::{Context, Poll};
+#[cfg(feature = "sink")]
+use futures_sink::Sink;
+use pin_project_lite::pin_project;
+
+pin_project! {
+    /// Stream for the [`fuse`](super::StreamExt::fuse) method.
+    #[derive(Debug)]
+    #[must_use = "streams do nothing unless polled"]
+    pub struct Fuse<St> {
+        #[pin]
+        stream: St,
+        done: bool,
+    }
+}
+
+impl<St> Fuse<St> {
+    pub(super) fn new(stream: St) -> Self {
+        Self { stream, done: false }
+    }
+
+    /// Returns whether the underlying stream has finished or not.
+    ///
+    /// If this method returns `true`, then all future calls to poll are
+    /// guaranteed to return `None`. If this returns `false`, then the
+    /// underlying stream is still in use.
+    pub fn is_done(&self) -> bool {
+        self.done
+    }
+
+    delegate_access_inner!(stream, St, ());
+}
+
+impl<S: Stream> FusedStream for Fuse<S> {
+    fn is_terminated(&self) -> bool {
+        self.done
+    }
+}
+
+impl<S: Stream> Stream for Fuse<S> {
+    type Item = S::Item;
+
+    fn poll_next(
+        self: Pin<&mut Self>,
+        cx: &mut Context<'_>,
+    ) -> Poll<Option<S::Item>> {
+        let this = self.project();
+
+        if *this.done {
+            return Poll::Ready(None);
+        }
+
+        let item = ready!(this.stream.poll_next(cx));
+        if item.is_none() {
+            *this.done = true;
+        }
+        Poll::Ready(item)
+    }
+
+    fn size_hint(&self) -> (usize, Option<usize>) {
+        if self.done {
+            (0, Some(0))
+        } else {
+            self.stream.size_hint()
+        }
+    }
+}
+
+// Forwarding impl of Sink from the underlying stream
+#[cfg(feature = "sink")]
+impl<S: Stream + Sink<Item>, Item> Sink<Item> for Fuse<S> {
+    type Error = S::Error;
+
+    delegate_sink!(stream, Item);
+}