Fermion_Index.h

#ifndef QNANO_NEW_FERMION_INDEX_DEFINED
#define QNANO_NEW_FERMION_INDEX_DEFINED


#include "tools/List_Class.h"
#include <algorithm>
#include <fstream>
#include <iostream>
#include <complex>


struct Fermion_Index: public List_Class<int>{
  

  //Constructors
  Fermion_Index(){  }
  Fermion_Index(size_t sz){ list.resize(sz);}
  Fermion_Index(const std::vector<int> & lst){ list=lst; }
  Fermion_Index(const Fermion_Index & other){ list=other.list; }
  Fermion_Index & operator=(const std::vector<int> & lst){ list=lst; return *this; }
  Fermion_Index & operator=(const Fermion_Index & other){ list=other.list; return *this;  }
  ~Fermion_Index(){ }
  
  //bring list of indices in the right order; return sign (-1)^(nr. swaps) 
  double sort_get_sign();

  //equality/inequality operators used for sorting:
  bool operator==(const Fermion_Index &other) const;
  bool operator!=(const Fermion_Index &other) const;
  bool operator<(const Fermion_Index &other) const;
  bool operator>(const Fermion_Index &other) const;

  void erase(int i);
};

std::ostream &operator<<(std::ostream & os, const Fermion_Index & fi);


#endif