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use futures::executor::block_on;
use futures::sink::{Sink, SinkExt};
use futures::stream::{self, Stream, StreamExt};
use futures::task::{Context, Poll};
use pin_utils::unsafe_pinned;
use std::pin::Pin;
struct Join<T, U> {
stream: T,
sink: U
}
impl<T, U> Join<T, U> {
unsafe_pinned!(stream: T);
unsafe_pinned!(sink: U);
}
impl<T: Stream, U> Stream for Join<T, U> {
type Item = T::Item;
fn poll_next(
self: Pin<&mut Self>,
cx: &mut Context<'_>,
) -> Poll<Option<T::Item>> {
self.stream().poll_next(cx)
}
}
impl<T, U: Sink<Item>, Item> Sink<Item> for Join<T, U> {
type Error = U::Error;
fn poll_ready(
self: Pin<&mut Self>,
cx: &mut Context<'_>,
) -> Poll<Result<(), Self::Error>> {
self.sink().poll_ready(cx)
}
fn start_send(
self: Pin<&mut Self>,
item: Item,
) -> Result<(), Self::Error> {
self.sink().start_send(item)
}
fn poll_flush(
self: Pin<&mut Self>,
cx: &mut Context<'_>,
) -> Poll<Result<(), Self::Error>> {
self.sink().poll_flush(cx)
}
fn poll_close(
self: Pin<&mut Self>,
cx: &mut Context<'_>,
) -> Poll<Result<(), Self::Error>> {
self.sink().poll_close(cx)
}
}
#[test]
fn test_split() {
let mut dest: Vec<i32> = Vec::new();
{
let join = Join {
stream: stream::iter(vec![10, 20, 30]),
sink: &mut dest
};
let (sink, stream) = join.split();
let join = sink.reunite(stream).expect("test_split: reunite error");
let (mut sink, stream) = join.split();
let mut stream = stream.map(Ok);
block_on(sink.send_all(&mut stream)).unwrap();
}
assert_eq!(dest, vec![10, 20, 30]);
}
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