Start an asynchronous send on a connected socket.
template< typename ConstBufferSequence, typename WriteToken = DEFAULT> DEDUCED async_send( const ConstBufferSequence & buffers, WriteToken && token = DEFAULT); » more... template< typename ConstBufferSequence, typename WriteToken = DEFAULT> DEDUCED async_send( const ConstBufferSequence & buffers, socket_base::message_flags flags, WriteToken && token = DEFAULT); » more...