Function tokio::io::util::copy_bidirectional::transfer_one_direction

source ยท 
fn transfer_one_direction<A, B>(
    cx: &mut Context<'_>,
    state: &mut TransferState,
    r: &mut A,
    w: &mut B,
) -> Poll<Result<u64>>
where
    A: AsyncRead + AsyncWrite + Unpin + ?Sized,
    B: AsyncRead + AsyncWrite + Unpin + ?Sized,