32 lines
792 B
Rust
32 lines
792 B
Rust
use futures_core::future::Future;
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use futures_core::task::{Context, Poll};
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use futures_io::AsyncWrite;
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use std::io;
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use std::pin::Pin;
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/// Future for the [`flush`](super::AsyncWriteExt::flush) method.
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#[derive(Debug)]
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#[must_use = "futures do nothing unless you `.await` or poll them"]
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pub struct Flush<'a, W: ?Sized> {
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writer: &'a mut W,
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}
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impl<W: ?Sized + Unpin> Unpin for Flush<'_, W> {}
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impl<'a, W: AsyncWrite + ?Sized + Unpin> Flush<'a, W> {
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pub(super) fn new(writer: &'a mut W) -> Self {
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Self { writer }
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}
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}
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impl<W> Future for Flush<'_, W>
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where
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W: AsyncWrite + ?Sized + Unpin,
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{
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type Output = io::Result<()>;
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fn poll(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> {
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Pin::new(&mut *self.writer).poll_flush(cx)
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}
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}
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