Overload ( ) for Point : overload bracket operator « Operator Overloading « C++ Tutorial

1. C++ Tutorial
2. Operator Overloading
3. overload bracket operator

#include <iostream>
using namespace std;

class Point {
  int x, y;
public:
  Point() {}
  Point(int px, int py) {
    x = px;
    y = py;
  }

  void show() {
    cout << x << " ";
    cout << y << "\n";
  }

  Point operator+(Point op2);
  Point operator()(int i, int j);
};

// Overload ( ) for Point.
Point Point::operator()(int i, int j)
{
  x = i;
  y = j;

  return *this;
}

// Overload + for Point.
Point Point::operator+(Point op2)
{
  Point temp;

  temp.x = op2.x + x;
  temp.y = op2.y + y;

  return temp;
}

int main()
{
  Point ob1(10, 20), ob2(1, 1);

  ob1.show();
  ob1(7, 8); // can be executed by itself
  ob1.show();

  ob1 = ob2 + ob1(10, 10); // can be used in expressions
  ob1.show();

  return 0;
}

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