shutdown.rs.html -- source

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vec_map

use crate::io::AsyncWrite;

use std::future::Future;
use std::io;
use std::pin::Pin;
use std::task::{Context, Poll};

cfg_io_util! {
    /// 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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