1 | use crate::io::AsyncRead; |
2 | use futures_core::future::Future; |
3 | use futures_core::task::{Context, Poll}; |
4 | use std::io::{self, IoSliceMut}; |
5 | use std::pin::Pin; |
6 | |
7 | /// Future for the [`read_vectored`](super::AsyncReadExt::read_vectored) method. |
8 | #[derive (Debug)] |
9 | #[must_use = "futures do nothing unless you `.await` or poll them" ] |
10 | pub struct ReadVectored<'a, R: ?Sized> { |
11 | reader: &'a mut R, |
12 | bufs: &'a mut [IoSliceMut<'a>], |
13 | } |
14 | |
15 | impl<R: ?Sized + Unpin> Unpin for ReadVectored<'_, R> {} |
16 | |
17 | impl<'a, R: AsyncRead + ?Sized + Unpin> ReadVectored<'a, R> { |
18 | pub(super) fn new(reader: &'a mut R, bufs: &'a mut [IoSliceMut<'a>]) -> Self { |
19 | Self { reader, bufs } |
20 | } |
21 | } |
22 | |
23 | impl<R: AsyncRead + ?Sized + Unpin> Future for ReadVectored<'_, R> { |
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 ReadVectored<'_, R> = &mut *self; |
28 | Pin::new(&mut this.reader).poll_read_vectored(cx, this.bufs) |
29 | } |
30 | } |
31 | |