diff options
Diffstat (limited to 'src/stream/map.rs')
-rw-r--r-- | src/stream/map.rs | 51 |
1 files changed, 0 insertions, 51 deletions
diff --git a/src/stream/map.rs b/src/stream/map.rs deleted file mode 100644 index dfac5a2..0000000 --- a/src/stream/map.rs +++ /dev/null @@ -1,51 +0,0 @@ -use crate::stream::Stream; - -use core::fmt; -use core::pin::Pin; -use core::task::{Context, Poll}; -use pin_project_lite::pin_project; - -pin_project! { - /// Stream for the [`map`](super::StreamExt::map) method. - #[must_use = "streams do nothing unless polled"] - pub struct Map<St, F> { - #[pin] - stream: St, - f: F, - } -} - -impl<St, F> fmt::Debug for Map<St, F> -where - St: fmt::Debug, -{ - fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result { - f.debug_struct("Map").field("stream", &self.stream).finish() - } -} - -impl<St, F> Map<St, F> { - pub(super) fn new(stream: St, f: F) -> Self { - Map { stream, f } - } -} - -impl<St, F, T> Stream for Map<St, F> -where - St: Stream, - F: FnMut(St::Item) -> T, -{ - type Item = T; - - fn poll_next(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Option<T>> { - self.as_mut() - .project() - .stream - .poll_next(cx) - .map(|opt| opt.map(|x| (self.as_mut().project().f)(x))) - } - - fn size_hint(&self) -> (usize, Option<usize>) { - self.stream.size_hint() - } -} |