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Start an asynchronous write. The data being written must be valid for the lifetime of the asynchronous operation.
template< typename ConstBufferSequence, typename WriteHandler = default_completion_token_t<executor_type>> DEDUCED async_write_some( const ConstBufferSequence & buffers, WriteHandler && handler = default_completion_token_t< executor_type >());
void(boost::system::error_code, std::size_t)