Program Listing for File index_pair.hpp

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#ifndef index_pair_h
#define index_pair_h

#include <iostream>

using namespace std;

struct index_pair
{
    size_t r;
    size_t c;

    index_pair() : r(0), c(0) {}

    index_pair(size_t _r, size_t _c) : r(_r), c(_c) {}

  index_pair swap(){return index_pair(c, r);}

    friend std::ostream & operator<<(std::ostream &s, const index_pair &e)
    {
        s << '(' << e.r+1 << ',' << e.c+1 << ")";
        return s;
    }

    string str() const{
        ostringstream sout;
        sout << *this;
        return sout.str();
    }

    friend inline bool operator<(const index_pair &x, const index_pair &y){
        if(x.r < y.r) return true;
        else if(x.r > y.r) return false;
        else if(x.c < y.c) return true;
        else if(x.c > y.c) return false;
        else return false;
    }


};


#endif