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use core::marker::Unpin;
use core::pin::Pin;
use futures_core::future::Future;
use futures_core::task::{LocalWaker, Poll};
use futures_sink::Sink;
#[derive(Debug)]
#[must_use = "futures do nothing unless polled"]
pub struct Flush<'a, Si: 'a + Unpin + ?Sized> {
sink: &'a mut Si,
}
impl<Si: Unpin + ?Sized> Unpin for Flush<'_, Si> {}
impl<'a, Si: Sink + Unpin + ?Sized> Flush<'a, Si> {
pub(super) fn new(sink: &'a mut Si) -> Self {
Flush { sink }
}
}
impl<Si: Sink + Unpin + ?Sized> Future for Flush<'_, Si> {
type Output = Result<(), Si::SinkError>;
fn poll(
mut self: Pin<&mut Self>,
lw: &LocalWaker,
) -> Poll<Self::Output> {
Pin::new(&mut self.sink).poll_flush(lw)
}
}