Start an asynchronous receive.
template< typename MutableBufferSequence, typename ReadToken = DEFAULT> DEDUCED async_receive_from( const MutableBufferSequence & buffers, endpoint_type & sender_endpoint, ReadToken && token = DEFAULT);
This function is used to asynchronously receive a datagram. It is an initiating function for an asynchronous operation, and always returns immediately.
One or more buffers into which the data will be received. 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 completion handler is called.
An endpoint object that receives the endpoint of the remote sender of the datagram. Ownership of the sender_endpoint object is retained by the caller, which must guarantee that it is valid until the completion handler is called.
token that will be used to produce a completion handler,
which will be called when the receive completes. Potential completion
yield_context, or a function
object with the correct completion signature. The function signature
of the completion handler must be:
void handler( const boost::system::error_code& error, // Result of operation. std::size_t bytes_transferred // Number of bytes received. );
Regardless of whether the asynchronous operation completes immediately
or not, the completion 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
To receive into a single data buffer use the
buffer function as follows:
socket.async_receive_from( boost::asio::buffer(data, size), sender_endpoint, handler);
documentation for information on receiving into multiple buffers in one
go, and how to use it with arrays, boost::array or std::vector.
On POSIX or Windows operating systems, this asynchronous operation supports
cancellation for the following