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template< typename ConstBufferSequence, typename WriteHandler> void async_write_some( const ConstBufferSequence & buffers, WriteHandler handler);
This function is used to asynchronously write one or more bytes of data to the stream. The function call always returns immediately.
The data to be written to the stream. Although the buffers object may be copied as necessary, ownership of the underlying buffers is retained by the caller, which must guarantee that they remain valid until the handler is called.
The handler to be called when the write operation completes. Copies will be made of the handler as required. The equivalent function signature of the handler must be:
void handler( const boost::system::error_code& error, // Result of operation. std::size_t bytes_transferred // Number of bytes written. );
The async_write_some operation may not transmit all of the data to the
peer. Consider using the async_write function if you need
to ensure that all data is written before the blocking operation completes.