#### basic_stream_socket::async_send

Start an asynchronous send.

    template<
        typename ConstBufferSequence,
        typename WriteHandler>
    void-or-deduced async_send(
        const ConstBufferSequence & buffers,
        WriteHandler handler);
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    template<
        typename ConstBufferSequence,
        typename WriteHandler>
    void-or-deduced async_send(
        const ConstBufferSequence & buffers,
        socket_base::message_flags flags,
        WriteHandler handler);
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