[c++] Overloading increment and decrement operators (C++ only)

 In the following example, the increment operator is overloaded in both ways:

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class X {

public:

  // member postfix x++

  void operator++(int) { };

};

class Y { };

// nonmember postfix y++

void operator++(Y&, int) { };

int main() {

  X x;

  Y y;

  // calls x.operator++(0)

  // default argument of zero is supplied by compiler

  x++;

  // explicit call to member postfix x++

  x.operator++(0);

  // calls operator++(y, 0)

  y++;

  // explicit call to non-member postfix y++

  operator++(y, 0);

}