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use crate::io::AsyncWrite;
use std::future::Future;
use std::io;
use std::mem;
use std::pin::Pin;
use std::task::{Context, Poll};
cfg_io_util! {
#[derive(Debug)]
#[must_use = "futures do nothing unless you `.await` or poll them"]
pub struct WriteAll<'a, W: ?Sized> {
writer: &'a mut W,
buf: &'a [u8],
}
}
pub(crate) fn write_all<'a, W>(writer: &'a mut W, buf: &'a [u8]) -> WriteAll<'a, W>
where
W: AsyncWrite + Unpin + ?Sized,
{
WriteAll { writer, buf }
}
impl<W> Future for WriteAll<'_, W>
where
W: AsyncWrite + Unpin + ?Sized,
{
type Output = io::Result<()>;
fn poll(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<io::Result<()>> {
let me = &mut *self;
while !me.buf.is_empty() {
let n = ready!(Pin::new(&mut me.writer).poll_write(cx, me.buf))?;
{
let (_, rest) = mem::replace(&mut me.buf, &[]).split_at(n);
me.buf = rest;
}
if n == 0 {
return Poll::Ready(Err(io::ErrorKind::WriteZero.into()));
}
}
Poll::Ready(Ok(()))
}
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn assert_unpin() {
use std::marker::PhantomPinned;
crate::is_unpin::<WriteAll<'_, PhantomPinned>>();
}
}
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