#include <iostream>
#include <map>
using namespace std;
 
struct Node
    {
       int a;     
 
     };
 
 
    // This is not called
 
  bool operator< (const Node &p_node1,const Node &p_node2)
  {
       printf("\nCALLED OPERATOR OVERLOADING");
       return true;
  }
 
    int main()
    {
       using namespace std;        
       map<Node,int> my_map;        
       Node n1;
       n1.a=55;
 
       my_map[n1]=2; // operator overloading should be called
 
	Node n2;
       n2.a=55;
 
       my_map[n2]=3;
 
       return 0;
    }

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