#### basic_datagram_socket::async_send

Start an asynchronous send on a connected socket.

    template<
        typename ConstBufferSequence,
        typename WriteHandler>
    DEDUCED async_send(
        const ConstBufferSequence & buffers,
        WriteHandler && handler);
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    template<
        typename ConstBufferSequence,
        typename WriteHandler>
    DEDUCED async_send(
        const ConstBufferSequence & buffers,
        socket_base::message_flags flags,
        WriteHandler && handler);
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