| 113 |  |  | 
| 114 |  | // neighbor list routines | 
| 115 |  | virtual bool checkNeighborList(); | 
| 116 | < | virtual vector<pair<int, int> >  buildNeighborList() = 0; | 
| 116 | > | virtual void buildNeighborList(vector<pair<int, int> >& neighborList) = 0; | 
| 117 |  |  | 
| 118 |  | // how to handle cutoffs: | 
| 119 |  | void setCutoffPolicy(CutoffPolicy cp) {cutoffPolicy_ = cp;} | 
| 121 |  |  | 
| 122 |  | // group bookkeeping | 
| 123 |  | virtual groupCutoffs getGroupCutoffs(int cg1, int cg2) = 0; | 
| 124 | < | virtual Vector3d getGroupVelocityColumn(int atom2) = 0; | 
| 124 | > | virtual Vector3d& getGroupVelocityColumn(int atom2) = 0; | 
| 125 |  |  | 
| 126 |  | // Group->atom bookkeeping | 
| 127 | < | virtual vector<int> getAtomsInGroupRow(int cg1) = 0; | 
| 128 | < | virtual vector<int> getAtomsInGroupColumn(int cg2) = 0; | 
| 127 | > | virtual vector<int>& getAtomsInGroupRow(int cg1) = 0; | 
| 128 | > | virtual vector<int>& getAtomsInGroupColumn(int cg2) = 0; | 
| 129 |  |  | 
| 130 |  | virtual Vector3d getAtomToGroupVectorRow(int atom1, int cg1) = 0; | 
| 131 |  | virtual Vector3d getAtomToGroupVectorColumn(int atom2, int cg2) = 0; | 
| 132 | < | virtual RealType getMassFactorRow(int atom1) = 0; | 
| 133 | < | virtual RealType getMassFactorColumn(int atom2) = 0; | 
| 132 | > | virtual RealType& getMassFactorRow(int atom1) = 0; | 
| 133 | > | virtual RealType& getMassFactorColumn(int atom2) = 0; | 
| 134 |  |  | 
| 135 |  | // spatial data | 
| 136 |  | virtual Vector3d getIntergroupVector(int cg1, int cg2) = 0; | 
| 137 |  | virtual Vector3d getInteratomicVector(int atom1, int atom2) = 0; | 
| 138 |  |  | 
| 139 |  | // atom bookkeeping | 
| 140 | < | virtual int getNAtomsInRow() = 0; | 
| 141 | < | virtual vector<int> getExcludesForAtom(int atom1) = 0; | 
| 140 | > | virtual int& getNAtomsInRow() = 0; | 
| 141 | > | virtual vector<int>& getExcludesForAtom(int atom1) = 0; | 
| 142 |  | virtual bool skipAtomPair(int atom1, int atom2, int cg1, int cg2) = 0; | 
| 143 |  | virtual bool excludeAtomPair(int atom1, int atom2) = 0; | 
| 144 |  | virtual int getTopologicalDistance(int atom1, int atom2) = 0; | 
| 145 |  | virtual void addForceToAtomRow(int atom1, Vector3d fg) = 0; | 
| 146 |  | virtual void addForceToAtomColumn(int atom2, Vector3d fg) = 0; | 
| 147 | < | virtual Vector3d getAtomVelocityColumn(int atom2) = 0; | 
| 147 | > | virtual Vector3d& getAtomVelocityColumn(int atom2) = 0; | 
| 148 |  |  | 
| 149 |  | // filling interaction blocks with pointers | 
| 150 |  | virtual void fillInteractionData(InteractionData &idat, int atom1, int atom2) = 0; |