@interface GroupActivities.Topic : _TtCs12_SwiftObject {
void /* unknown type, empty encoding */ topic;
void /* unknown type, empty encoding */ pubSubTopicGenerator;
void /* unknown type, empty encoding */ cancellables;
void /* unknown type, empty encoding */ stateMachine;
void /* unknown type, empty encoding */ delegate;
void /* unknown type, empty encoding */ subscription;
void /* unknown type, empty encoding */ name;
void /* unknown type, empty encoding */ receivedDataHandler;
void /* unknown type, empty encoding */ pubSubStateChangedHandler;
void /* unknown type, empty encoding */ catchupNeededHandler;
void /* unknown type, empty encoding */ dataCryptor;
void /* unknown type, empty encoding */ _subscribedParticipants;
void /* unknown type, empty encoding */ invalidationHandler;
void /* unknown type, empty encoding */ requestEncryptionKeysHandler;
void /* unknown type, empty encoding */ seqNumWatermark;
void /* unknown type, empty encoding */ pendingMessages;
void /* unknown type, empty encoding */ pendingMessagesLock;
}
@end