1use core::pin::Pin;
2use futures_core::stream::{FusedStream, Stream, TryStream};
3use futures_core::task::{Context, Poll};
4#[cfg(feature = "sink")]
5use futures_sink::Sink;
6use pin_project_lite::pin_project;
7
8pin_project! {
9 /// Stream for the [`into_stream`](super::TryStreamExt::into_stream) method.
10 #[derive(Debug)]
11 #[must_use = "streams do nothing unless polled"]
12 pub struct IntoStream<St> {
13 #[pin]
14 stream: St,
15 }
16}
17
18impl<St> IntoStream<St> {
19 #[inline]
20 pub(super) fn new(stream: St) -> Self {
21 Self { stream }
22 }
23
24 delegate_access_inner!(stream, St, ());
25}
26
27impl<St: TryStream + FusedStream> FusedStream for IntoStream<St> {
28 fn is_terminated(&self) -> bool {
29 self.stream.is_terminated()
30 }
31}
32
33impl<St: TryStream> Stream for IntoStream<St> {
34 type Item = Result<St::Ok, St::Error>;
35
36 #[inline]
37 fn poll_next(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Option<Self::Item>> {
38 self.project().stream.try_poll_next(cx)
39 }
40
41 fn size_hint(&self) -> (usize, Option<usize>) {
42 self.stream.size_hint()
43 }
44}
45
46// Forwarding impl of Sink from the underlying stream
47#[cfg(feature = "sink")]
48impl<S: Sink<Item>, Item> Sink<Item> for IntoStream<S> {
49 type Error = S::Error;
50
51 delegate_sink!(stream, Item);
52}
53