Start an asynchronous send on a connected socket.
template< typename ConstBufferSequence, typename WriteHandler = DEFAULT> DEDUCED async_send( const ConstBufferSequence & buffers, socket_base::message_flags flags, WriteHandler && handler = DEFAULT);
This function is used to asynchronously send data on the datagram socket. The function call always returns immediately.
One or more data buffers to be sent on the socket. 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.
Flags specifying how the send call is to be made.
The handler to be called when the send operation completes. Copies will be made of the handler as required. The function signature of the handler must be:
void handler( const asio::error_code& error, // Result of operation. std::size_t bytes_transferred // Number of bytes sent. );
Regardless of whether the asynchronous operation completes immediately
or not, the handler will not be invoked from within this function.
On immediate completion, invocation of the handler will be performed
in a manner equivalent to using
The async_send operation can only be used with a connected socket. Use the async_send_to function to send data on an unconnected datagram socket.
On POSIX or Windows operating systems, this asynchronous operation supports
cancellation for the following