#include
using std::cout;
using std::endl;
class Count {
friend void setX( Count &, int );
public:
Count() { x = 0; }
void print() const { cout << x << endl; }
private:
int x;
};
void setX( Count &c, int val )
{
c.x = val; // legal: setX is a friend of Count
}
int main()
{
Count counter;
cout << "counter.x after instantiation: ";
counter.print();
cout << "counter.x after call to setX friend function: ";
setX( counter, 8 ); // set x with a friend
counter.print();
return 0;
}