| use super::Feed; |
| use core::pin::Pin; |
| use futures_core::future::Future; |
| use futures_core::ready; |
| use futures_core::task::{Context, Poll}; |
| use futures_sink::Sink; |
| |
| /// Future for the [`send`](super::SinkExt::send) method. |
| #[derive(Debug)] |
| #[must_use = "futures do nothing unless you `.await` or poll them"] |
| pub struct Send<'a, Si: ?Sized, Item> { |
| feed: Feed<'a, Si, Item>, |
| } |
| |
| // Pinning is never projected to children |
| impl<Si: Unpin + ?Sized, Item> Unpin for Send<'_, Si, Item> {} |
| |
| impl<'a, Si: Sink<Item> + Unpin + ?Sized, Item> Send<'a, Si, Item> { |
| pub(super) fn new(sink: &'a mut Si, item: Item) -> Self { |
| Self { feed: Feed::new(sink, item) } |
| } |
| } |
| |
| impl<Si: Sink<Item> + Unpin + ?Sized, Item> Future for Send<'_, Si, Item> { |
| type Output = Result<(), Si::Error>; |
| |
| fn poll(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> { |
| let this = &mut *self; |
| |
| if this.feed.is_item_pending() { |
| ready!(Pin::new(&mut this.feed).poll(cx))?; |
| debug_assert!(!this.feed.is_item_pending()); |
| } |
| |
| // we're done sending the item, but want to block on flushing the |
| // sink |
| ready!(this.feed.sink_pin_mut().poll_flush(cx))?; |
| |
| Poll::Ready(Ok(())) |
| } |
| } |