1 use crate::io::AsyncWrite;
2 use futures_core::future::Future;
3 use futures_core::task::{Context, Poll};
4 use std::io::{self, IoSlice};
5 use std::pin::Pin;
6 
7 /// Future for the [`write_vectored`](super::AsyncWriteExt::write_vectored) method.
8 #[derive(Debug)]
9 #[must_use = "futures do nothing unless you `.await` or poll them"]
10 pub struct WriteVectored<'a, W: ?Sized> {
11     writer: &'a mut W,
12     bufs: &'a [IoSlice<'a>],
13 }
14 
15 impl<W: ?Sized + Unpin> Unpin for WriteVectored<'_, W> {}
16 
17 impl<'a, W: AsyncWrite + ?Sized + Unpin> WriteVectored<'a, W> {
new(writer: &'a mut W, bufs: &'a [IoSlice<'a>]) -> Self18     pub(super) fn new(writer: &'a mut W, bufs: &'a [IoSlice<'a>]) -> Self {
19         Self { writer, bufs }
20     }
21 }
22 
23 impl<W: AsyncWrite + ?Sized + Unpin> Future for WriteVectored<'_, W> {
24     type Output = io::Result<usize>;
25 
poll(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output>26     fn poll(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> {
27         let this = &mut *self;
28         Pin::new(&mut this.writer).poll_write_vectored(cx, this.bufs)
29     }
30 }
31