C++函数返回值是 unsigned

live555很多这种函数返回 unsigned

unsigned RTSPServer::registerStream(ServerMediaSession* serverMediaSession,
				    char const* remoteClientNameOrAddress, portNumBits remoteClientPortNum,
				    responseHandlerForREGISTER* responseHandler,
				    char const* username, char const* password,
				    Boolean receiveOurStreamViaTCP, char const* proxyURLSuffix)

unsigned其实是unsigned int，表示无符号整形，可以省略int，跟unsigned int等价