PairList.hpp

/*
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 *
 * SUPPORT OPEN SCIENCE!  If you use OpenMD or its source code in your
 * research, please cite the appropriate papers when you publish your
 * work.  Good starting points are:
 *
 * [1] Meineke, et al., J. Comp. Chem. 26, 252-271 (2005).
 * [2] Fennell & Gezelter, J. Chem. Phys. 124, 234104 (2006).
 * [3] Sun, Lin & Gezelter, J. Chem. Phys. 128, 234107 (2008).
 * [4] Vardeman, Stocker & Gezelter, J. Chem. Theory Comput. 7, 834 (2011).
 * [5] Kuang & Gezelter, Mol. Phys., 110, 691-701 (2012).
 * [6] Lamichhane, Gezelter & Newman, J. Chem. Phys. 141, 134109 (2014).
 * [7] Lamichhane, Newman & Gezelter, J. Chem. Phys. 141, 134110 (2014).
 * [8] Bhattarai, Newman & Gezelter, Phys. Rev. B 99, 094106 (2019).
 */
 
#ifndef BRAINS_PAIRLIST_HPP
 
#define BRAINS_PAIRLIST_HPP
 
#include <iostream>
#include <set>
#include <utility>
#include <vector>
 
namespace OpenMD {
 
  /**
   * @class PairList PairList.hpp "brains/PairList.hpp"
   * @brief PairList class maintains a general purpose list of atom
   * pairs using the global indices of the atoms.  This structure is
   * the general form for exclude lists as well as 1-4, 1-3, and 1-2
   * lists.
   */
  class PairList {
  public:
    PairList() : modified_(false) {}
 
    /** Adds a pair into this PairList class */
    void addPair(int i, int j);
 
    void addPairs(std::set<int>& set1, std::set<int>& set2);
    template<typename IterType1, typename IterType2>
    void addPairs(IterType1 iter1_first, IterType1 iter1_last,
                  IterType2 iter2_first, IterType2 iter2_last);
 
    /** Remove a pair from PairList class */
    void removePair(int i, int j);
 
    void removePairs(std::set<int>& set1, std::set<int>& set2);
    template<typename IterType1, typename IterType2>
    void removePairs(IterType1 iter1_first, IterType1 iter1_last,
                     IterType2 iter2_first, IterType2 iter2_last);
 
    /** Checks whether pair (i, j) is in this PairList class */
    bool hasPair(int i, int j);
 
    /** Returns the number of pairs in the list */
    int getSize();
 
    /** Returns the size of PairList */
    int getSizeOfPairList();
 
    /** Returns the pairs in a plain array*/
    int* getPairList();
 
    /** write out the exclusion list to an ostream */
    friend std::ostream& operator<<(std::ostream& o, PairList& e);
 
  private:
    std::set<std::pair<int, int>> pairSet_;
    std::vector<int> pairList_;
    bool modified_;
  };
}  // namespace OpenMD
 
#endif  // __PAIRLIST_H__