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use crate::io::AsyncWrite;
use pin_project_lite::pin_project;
use std::io;
use std::marker::PhantomPinned;
use std::pin::Pin;
use std::task::{Context, Poll};
use std::{future::Future, io::IoSlice};
pin_project! {
/// A future to write a slice of buffers to an `AsyncWrite`.
#[derive(Debug)]
#[must_use = "futures do nothing unless you `.await` or poll them"]
pub struct WriteVectored<'a, 'b, W: ?Sized> {
writer: &'a mut W,
bufs: &'a [IoSlice<'b>],
// Make this future `!Unpin` for compatibility with async trait methods.
#[pin]
_pin: PhantomPinned,
}
}
pub(crate) fn write_vectored<'a, 'b, W>(
writer: &'a mut W,
bufs: &'a [IoSlice<'b>],
) -> WriteVectored<'a, 'b, W>
where
W: AsyncWrite + Unpin + ?Sized,
{
WriteVectored {
writer,
bufs,
_pin: PhantomPinned,
}
}
impl<W> Future for WriteVectored<'_, '_, W>
where
W: AsyncWrite + Unpin + ?Sized,
{
type Output = io::Result<usize>;
fn poll(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<io::Result<usize>> {
let me = self.project();
Pin::new(&mut *me.writer).poll_write_vectored(cx, me.bufs)
}
}