/*
 *  Test Friend Function (TestFriend.cpp)
 */
#include <iostream>
using namespace std;
 
class Point {
   // A friend function defined outside this class, but its argument of
   // this class can access all class members (including private members).
   friend void set(Point & point, int x, int y);  // prototype
private:
   int x, y;
public:
   Point(int x = 0, int y = 0) : x(x), y(y) { }
   void print() const { cout << "(" << x << "," << y << ")" << endl; }
};
 
// Friend function is defined outside the class
void set(Point & point, int x, int y) {
  point.x = x;  // can access private data x and y
  point.y = y;
}
 
int main() {
   Point p1;
   p1.print();   // (0, 0)
   set(p1, 5, 6);
   p1.print();   // (5, 6)
}