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use crate::io::AsyncWrite;
use pin_project_lite::pin_project;
use std::future::Future;
use std::io;
use std::marker::PhantomPinned;
use std::pin::Pin;
use std::task::{Context, Poll};
pin_project! {
/// A future used to fully flush an I/O object.
///
/// Created by the [`AsyncWriteExt::flush`][flush] function.
/// [flush]: crate::io::AsyncWriteExt::flush
#[derive(Debug)]
#[must_use = "futures do nothing unless you `.await` or poll them"]
pub struct Flush<'a, A: ?Sized> {
a: &'a mut A,
// Make this future `!Unpin` for compatibility with async trait methods.
#[pin]
_pin: PhantomPinned,
}
}
/// Creates a future which will entirely flush an I/O object.
pub(super) fn flush<A>(a: &mut A) -> Flush<'_, A>
where
A: AsyncWrite + Unpin + ?Sized,
{
Flush {
a,
_pin: PhantomPinned,
}
}
impl<A> Future for Flush<'_, A>
where
A: AsyncWrite + Unpin + ?Sized,
{
type Output = io::Result<()>;
fn poll(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> {
let me = self.project();
Pin::new(&mut *me.a).poll_flush(cx)
}
}