Re: Operater < overloading for struct problem

Hello everyone,

I am having trouble overloading the < operator for an assignment. I
use a struct that contains information and I would like to sort this
structure using STL sort with my own criteria of sorting. Basically, I
would like to sort on visitor count of the Attraction structure.
However, it never uses the < overloaded operator with my code.

Handler.h:

#ifndef H_HANDLER //Guard
#define H_HANDLER

#include <iostream>
#include <vector>
using namespace std;

struct Attraction {
        string name;
        int visitors;

};

class Handler { //Define the class Handler

        private:
                vector<Attraction*> attractions ;
                vector<Attraction*>::iterator p ;

        public: //Public functions
                ~Handler();
                void addAttraction(string name, int visitors);
                void printAttractions();

};

#endif

and in the Handler.cpp I have:

Handler.cpp - snippet:

bool operator<(const Attraction& a,const Attraction& b){
                return a.visitors < b.visitors;
        }

Here is the function that performs the sort after adding a value:

void Handler::addAttraction(string name, int visitors){

                Attraction *attr;
                attr=new Attraction();

                attr->name=name;
                attr->visitors=visitors;

                attractions.push_back(attr);
                sort(attractions.begin(),attractions.end());

        }

However, whatever I do, it will never use the overloaded < operator
for sorting. What am I doing wrong? If I add the overloaded function
in the header it starts complaining because it will also be inserted
into the main program which is confusing since I have a guard around
the header file.