Function tokio::io::util::copy_bidirectional::copy_bidirectional_impl

source ยท 
async fn copy_bidirectional_impl<A, B>(
    a: &mut A,
    b: &mut B,
    a_to_b_buffer: CopyBuffer,
    b_to_a_buffer: CopyBuffer,
) -> Result<(u64, u64)>
where
    A: AsyncRead + AsyncWrite + Unpin + ?Sized,
    B: AsyncRead + AsyncWrite + Unpin + ?Sized,