...one of the most highly
regarded and expertly designed C++ library projects in the
world. — Herb Sutter and Andrei
Start an asynchronous operation to write all of the supplied data to a stream.
template< typename AsyncWriteStream, typename ConstBufferSequence, typename WriteHandler> void-or-deduced async_write( AsyncWriteStream & s, const ConstBufferSequence & buffers, WriteHandler handler);
This function is used to asynchronously write a certain number of bytes of data to a stream. The function call always returns immediately. The asynchronous operation will continue until one of the following conditions is true:
This operation is implemented in terms of zero or more calls to the stream's async_write_some function, and is known as a composed operation. The program must ensure that the stream performs no other write operations (such as async_write, the stream's async_write_some function, or any other composed operations that perform writes) until this operation completes.
The stream to which the data is to be written. The type must support the AsyncWriteStream concept.
One or more buffers containing the data to be written. Although the buffers object may be copied as necessary, ownership of the underlying memory blocks 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 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 from the // buffers. If an error occurred, // this will be less than the sum // of the buffer sizes. );
Regardless of whether the asynchronous operation completes immediately
or not, the handler will not be invoked from within this function.
Invocation of the handler will be performed in a manner equivalent
To write a single data buffer use the
buffer function as follows:
boost::asio::async_write(s, boost::asio::buffer(data, size), handler);
documentation for information on writing multiple buffers in one go, and
how to use it with arrays, boost::array or std::vector.