Send some data on a connected socket.

template<
    typename ConstBufferSequence>
std::size_t send(
    const ConstBufferSequence & buffers);
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template<
    typename ConstBufferSequence>
std::size_t send(
    const ConstBufferSequence & buffers,
    socket_base::message_flags flags);
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template<
    typename ConstBufferSequence>
std::size_t send(
    const ConstBufferSequence & buffers,
    socket_base::message_flags flags,
    asio::error_code & ec);
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