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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,117 @@ | ||
| use core::pin::Pin; | ||
| use core::task::{Context, Poll}; | ||
| use futures_core::future::Future; | ||
| use futures_core::stream::Stream; | ||
| use futures_sink::Sink; | ||
|
|
||
| /// Combines two different futures, streams, or sinks having the same associated types into a single | ||
| /// type. | ||
| #[derive(Debug, Clone)] | ||
| pub enum Either<A, B> { | ||
| /// First branch of the type | ||
| Left(A), | ||
| /// Second branch of the type | ||
| Right(B), | ||
| } | ||
|
|
||
| impl<A, B, T> Either<(T, A), (T, B)> { | ||
| /// Factor out a homogeneous type from an either of pairs. | ||
| /// | ||
| /// Here, the homogeneous type is the first element of the pairs. | ||
| pub fn factor_first(self) -> (T, Either<A, B>) { | ||
| match self { | ||
| Either::Left((x, a)) => (x, Either::Left(a)), | ||
| Either::Right((x, b)) => (x, Either::Right(b)), | ||
| } | ||
| } | ||
| } | ||
|
|
||
| impl<A, B, T> Either<(A, T), (B, T)> { | ||
| /// Factor out a homogeneous type from an either of pairs. | ||
| /// | ||
| /// Here, the homogeneous type is the second element of the pairs. | ||
| pub fn factor_second(self) -> (Either<A, B>, T) { | ||
| match self { | ||
| Either::Left((a, x)) => (Either::Left(a), x), | ||
| Either::Right((b, x)) => (Either::Right(b), x), | ||
| } | ||
| } | ||
| } | ||
|
|
||
| impl<A, B> Future for Either<A, B> | ||
| where | ||
| A: Future, | ||
| B: Future<Output = A::Output>, | ||
| { | ||
| type Output = A::Output; | ||
|
|
||
| fn poll(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<A::Output> { | ||
| unsafe { | ||
| match Pin::get_unchecked_mut(self) { | ||
| Either::Left(a) => Pin::new_unchecked(a).poll(cx), | ||
| Either::Right(b) => Pin::new_unchecked(b).poll(cx), | ||
| } | ||
| } | ||
| } | ||
| } | ||
|
|
||
| impl<A, B> Stream for Either<A, B> | ||
| where | ||
| A: Stream, | ||
| B: Stream<Item = A::Item>, | ||
| { | ||
| type Item = A::Item; | ||
|
|
||
| fn poll_next(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Option<A::Item>> { | ||
| unsafe { | ||
| match Pin::get_unchecked_mut(self) { | ||
| Either::Left(a) => Pin::new_unchecked(a).poll_next(cx), | ||
| Either::Right(b) => Pin::new_unchecked(b).poll_next(cx), | ||
| } | ||
| } | ||
| } | ||
| } | ||
|
|
||
| impl<A, B, Item> Sink<Item> for Either<A, B> | ||
| where | ||
| A: Sink<Item>, | ||
| B: Sink<Item, SinkError = A::SinkError>, | ||
| { | ||
| type SinkError = A::SinkError; | ||
|
|
||
| fn poll_ready(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Result<(), Self::SinkError>> { | ||
| unsafe { | ||
| match Pin::get_unchecked_mut(self) { | ||
| Either::Left(x) => Pin::new_unchecked(x).poll_ready(cx), | ||
| Either::Right(x) => Pin::new_unchecked(x).poll_ready(cx), | ||
| } | ||
| } | ||
| } | ||
|
|
||
| fn start_send(self: Pin<&mut Self>, item: Item) -> Result<(), Self::SinkError> { | ||
| unsafe { | ||
| match Pin::get_unchecked_mut(self) { | ||
| Either::Left(x) => Pin::new_unchecked(x).start_send(item), | ||
| Either::Right(x) => Pin::new_unchecked(x).start_send(item), | ||
| } | ||
| } | ||
| } | ||
|
|
||
| fn poll_flush(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Result<(), Self::SinkError>> { | ||
| unsafe { | ||
| match Pin::get_unchecked_mut(self) { | ||
| Either::Left(x) => Pin::new_unchecked(x).poll_flush(cx), | ||
| Either::Right(x) => Pin::new_unchecked(x).poll_flush(cx), | ||
| } | ||
| } | ||
| } | ||
|
|
||
| fn poll_close(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Result<(), Self::SinkError>> { | ||
| unsafe { | ||
| match Pin::get_unchecked_mut(self) { | ||
| Either::Left(x) => Pin::new_unchecked(x).poll_close(cx), | ||
| Either::Right(x) => Pin::new_unchecked(x).poll_close(cx), | ||
| } | ||
| } | ||
| } | ||
| } |
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