virtual const int* getUpCells(int cellId) = 0;
virtual const unsigned char* getUpTypes(int cellId) = 0;
virtual void getNodeIds(int cellId, std::set<int>& nodeSet) = 0;
virtual const int* getUpCells(int cellId) = 0;
virtual const unsigned char* getUpTypes(int cellId) = 0;
virtual void getNodeIds(int cellId, std::set<int>& nodeSet) = 0;