blob: dcd967c268202449a4a2360ea84c9a69a056bb1a [file] [log] [blame]
use core::marker::{PhantomData, Unpin};
use core::pin::Pin;
use futures_core::stream::{FusedStream, Stream, TryStream};
use futures_core::task::{LocalWaker, Poll};
use pin_utils::unsafe_pinned;
/// Stream for the [`err_into`](super::TryStreamExt::err_into) combinator.
#[derive(Debug)]
#[must_use = "streams do nothing unless polled"]
pub struct ErrInto<St, E> {
stream: St,
_marker: PhantomData<E>,
}
impl<St: Unpin, E> Unpin for ErrInto<St, E> {}
impl<St, E> ErrInto<St, E> {
unsafe_pinned!(stream: St);
pub(super) fn new(stream: St) -> Self {
ErrInto { stream, _marker: PhantomData }
}
}
impl<St: FusedStream, E> FusedStream for ErrInto<St, E> {
fn is_terminated(&self) -> bool {
self.stream.is_terminated()
}
}
impl<St, E> Stream for ErrInto<St, E>
where
St: TryStream,
St::Error: Into<E>,
{
type Item = Result<St::Ok, E>;
fn poll_next(
mut self: Pin<&mut Self>,
lw: &LocalWaker,
) -> Poll<Option<Self::Item>> {
self.stream().try_poll_next(lw)
.map(|res| res.map(|some| some.map_err(Into::into)))
}
}