// Listing 14.5

 //Overload operator plus (+)

 #include <iostream>

 

 class Counter

 {

 public:

     Counter();

     Counter(int initialValue);

     ~Counter(){}

     int GetItsVal()const { return itsVal; }

     void SetItsVal(int x) {itsVal = x; }

     Counter operator+ (const Counter &);

 private:

     int itsVal;

 };

 

 Counter::Counter(int initialValue):

 itsVal(initialValue)

 {}

 

 Counter::Counter():

 itsVal(0)

 {}

 

 Counter Counter::operator+ (const Counter & rhs)

 {

     return Counter(itsVal + rhs.GetItsVal());

 }

 

 int main()

 {

     Counter varOne(2), varTwo(4), varThree;

     varThree = varOne + varTwo;

     std::cout << "varOne: " << varOne.GetItsVal()<< std::endl;

     std::cout << "varTwo: " << varTwo.GetItsVal() << std::endl;

     std::cout << "varThree: " << varThree.GetItsVal() 

         << std::endl;

     return 0;

 }