Start an asynchronous receive.
template< typename MutableBufferSequence, typename ReadHandler> void async_receive_from( const MutableBufferSequence & buffers, endpoint_type & sender_endpoint, ReadHandler handler); template< typename MutableBufferSequence, typename ReadHandler> void async_receive_from( const MutableBufferSequence & buffers, endpoint_type & sender_endpoint, socket_base::message_flags flags, ReadHandler handler);