Overload the -- relative to MyClass class using a friend. : Minus Minus « Overload « C++






  1. C++
  2. Overload
  3. Minus Minus

Overload the -- relative to MyClass class using a friend.

Overload the -- relative to MyClass class using a friend.
#include <iostream>
using namespace std;

class MyClass {
  int x, y; 
public:
  MyClass() { 
     x=0; 
     y=0; 
  }
  MyClass(int i, int j) { 
     x=i; 
     y=j; 
  }
  void getXY(int &i, int &j) { 
     i=x; 
     j=y; 
  }
  friend MyClass operator--(MyClass &ob);              // prefix
  friend MyClass operator--(MyClass &ob, int notused); // postfix
};

// Overload -- (prefix) for MyClass class using a friend.
MyClass operator--(MyClass &ob)
{
  ob.x--;
  ob.y--;
  return ob;
}

// Overload -- (postfix) for MyClass class using a friend.
MyClass operator--(MyClass &ob, int notused)
{
  ob.x--;
  ob.y--;
  return ob;
}

int main()
{
  MyClass object1(10, 10);
  int x, y;

  --object1; // decrement object1 an object
  object1.getXY(x, y);
  cout << "(--object1) X: " << x << ", Y: " << y << endl;

  object1--; // decrement object1 an object
  object1.getXY(x, y);
  cout << "(object1--) X: " << x << ", Y: " << y << endl;

  return 0;
}








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