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