async-ioutil 0.2.0

A collection of Rust asynchronous I/O utilities
Documentation 
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use futures::{AsyncRead, AsyncWrite};

/// Discard is an empty writer and reader, written data will be discarded.
#[derive(Debug, Clone, Default)]
pub struct Discard;

impl Discard {
    pub fn new() -> Self {
        Discard
    }
}

impl AsyncRead for Discard {
    fn poll_read(
        self: std::pin::Pin<&mut Self>,
        _cx: &mut std::task::Context<'_>,
        _buf: &mut [u8],
    ) -> std::task::Poll<std::io::Result<usize>> {
        std::task::Poll::Ready(Ok(0))
    }
}

impl AsyncWrite for Discard {
    fn poll_write(
        self: std::pin::Pin<&mut Self>,
        _cx: &mut std::task::Context<'_>,
        _buf: &[u8],
    ) -> std::task::Poll<std::io::Result<usize>> {
        std::task::Poll::Ready(Ok(0))
    }

    fn poll_flush(
        self: std::pin::Pin<&mut Self>,
        _cx: &mut std::task::Context<'_>,
    ) -> std::task::Poll<std::io::Result<()>> {
        std::task::Poll::Ready(Ok(()))
    }

    fn poll_close(
        self: std::pin::Pin<&mut Self>,
        _cx: &mut std::task::Context<'_>,
    ) -> std::task::Poll<std::io::Result<()>> {
        std::task::Poll::Ready(Ok(()))
    }
}