Fermion_Double_Index_Ref.h

#ifndef QNANO_NEW_FERMION_DOUBLE_INDEX_REF_DEFINED_H
#define QNANO_NEW_FERMION_DOUBLE_INDEX_REF_DEFINED_H

#include "manybody/Fermion_Double_Index.h"

/* Define reference to Fermion_Double_Index for the purpose of sorting 
   in Selected_Manybody_States */


class Fermion_Double_Index_Ref{
public: 
  const Fermion_Double_Index *ptr;
  
  operator const Fermion_Double_Index *() const{return ptr;}

  Fermion_Double_Index_Ref operator=(const Fermion_Double_Index *p){
    ptr=p;
    return *this;
  }
  Fermion_Double_Index_Ref(const Fermion_Double_Index *p){
    operator=(p);
  }

  //Compare operators for sorting and searching
  bool operator==(const Fermion_Double_Index_Ref &other) const;
  bool operator!=(const Fermion_Double_Index_Ref &other) const;
  bool operator<(const Fermion_Double_Index_Ref &other) const;
  bool operator>(const Fermion_Double_Index_Ref &other) const;
};
std::ostream &operator<<(std::ostream & os, const Fermion_Double_Index_Ref & fi);


#endif