1use crate::io::AsyncWrite;
2use futures_core::future::Future;
3use futures_core::task::{Context, Poll};
4use std::io;
5use std::pin::Pin;
6
7/// Future for the [`write`](super::AsyncWriteExt::write) method.
8#[derive(Debug)]
9#[must_use = "futures do nothing unless you `.await` or poll them"]
10pub struct Write<'a, W: ?Sized> {
11 writer: &'a mut W,
12 buf: &'a [u8],
13}
14
15impl<W: ?Sized + Unpin> Unpin for Write<'_, W> {}
16
17impl<'a, W: AsyncWrite + ?Sized + Unpin> Write<'a, W> {
18 pub(super) fn new(writer: &'a mut W, buf: &'a [u8]) -> Self {
19 Self { writer, buf }
20 }
21}
22
23impl<W: AsyncWrite + ?Sized + Unpin> Future for Write<'_, W> {
24 type Output = io::Result<usize>;
25
26 fn poll(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> {
27 let this: &mut Write<'_, W> = &mut *self;
28 Pin::new(&mut this.writer).poll_write(cx, this.buf)
29 }
30}
31