MuonSpectrometer/MuonCalib/MuonCalibUtils/MuonCalibMath/MuonCalibMath/Combination.h

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/*
  Copyright (C) 2002-2021 CERN for the benefit of the ATLAS collaboration
*/
 
//+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
// 27.10.2007, AUTHOR: OLIVER KORTNER
//+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 
#ifndef MuonCalib_CombinationH
#define MuonCalib_CombinationH
 
//:::::::::::::::::::::::
//:: CLASS Combination ::
//:::::::::::::::::::::::
 
 
//::::::::::::::::::
//:: HEADER FILES ::
//::::::::::::::::::
 
// STL //
#include <vector>
 
namespace MuonCalib {
 
class Combination {
 
public:
// Constructors //
    Combination(void);
 
    Combination(const unsigned int & n, const unsigned int & k);
 
// Methods //
// get-methods //
    unsigned int numberOfElements(void) const;
    unsigned int whichClass(void) const;
    unsigned int numberOfCombinations(void) const;
    void currentCombination(std::vector<unsigned int> & index_array) const;
    void nextCombination(std::vector<unsigned int> & index_array);
 
// set-methods //
    void reset(void);
    void setNewParameters(const unsigned int & nb_elements,
                    const unsigned int & wh_class);
 
private:
    unsigned int m_n = 0U; // the n of Comb(n, k)
    unsigned int m_k = 0U; // the k of Comb(n, k)
    std::vector<unsigned int> m_index; // vector containing the indices of
                       // the current combination
    std::vector<unsigned int> m_flag; // vector of flags
 
    void init(const unsigned int & n, const unsigned int & k);
                    // initialization method;
                    // n: number of elements;
                    // k: Class of the combination
 
};
 
}
 
 
#endif