use core::marker::PhantomData; use core::pin::Pin; use futures_core::future::Future; use futures_core::task::{Context, Poll}; use futures_sink::Sink; /// Future for the [`close`](super::SinkExt::close) method. #[derive(Debug)] #[must_use = "futures do nothing unless you `.await` or poll them"] pub struct Close<'a, Si: ?Sized, Item> { sink: &'a mut Si, _phantom: PhantomData<fn(Item)>, } impl<Si: Unpin + ?Sized, Item> Unpin for Close<'_, Si, Item> {} /// A future that completes when the sink has finished closing. /// /// The sink itself is returned after closing is complete. impl<'a, Si: Sink<Item> + Unpin + ?Sized, Item> Close<'a, Si, Item> { pub(super) fn new(sink: &'a mut Si) -> Self { Self { sink, _phantom: PhantomData } } } impl<Si: Sink<Item> + Unpin + ?Sized, Item> Future for Close<'_, Si, Item> { type Output = Result<(), Si::Error>; fn poll(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> { Pin::new(&mut self.sink).poll_close(cx) } }