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use crate::io::AsyncWrite;
use std::future::Future;
use std::io;
use std::pin::Pin;
use std::task::{Context, Poll};
/// A future used to shutdown an I/O object.
///
/// Created by the [`AsyncWriteExt::shutdown`] function.
#[derive(Debug)]
pub struct Shutdown<'a, A: ?Sized> {
a: &'a mut A,
}
/// Creates a future which will shutdown an I/O object.
pub(super) fn shutdown<A>(a: &mut A) -> Shutdown<'_, A>
where
A: AsyncWrite + Unpin + ?Sized,
{
Shutdown { a }
}
impl<A> Future for Shutdown<'_, A>
where
A: AsyncWrite + Unpin + ?Sized,
{
type Output = io::Result<()>;
fn poll(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> {
let me = &mut *self;
Pin::new(&mut *me.a).poll_shutdown(cx)
}
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn assert_unpin() {
use std::marker::PhantomPinned;
crate::is_unpin::<Shutdown<'_, PhantomPinned>>();
}
}
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