It is possible to grant a nonmember function access to the private members of a class by using a friend. A friend function has access to all private and protected members of the class for which it is a friend.
Here, the function
sum
is not a member function of class
Test
. Still, it can access private member of class
Test
as it's a friend function of the class.
#include <iostream>
using namespace std;
class Test {
int x, y;
public:
friend int sum(Test t);
void setValues(int x, int y) {
this -> x = x;
this -> y = y;
}
};
int sum (Test t) {
return t.x + t.y;
}
int main() {
Test t;
t.setValues(4, 5);
cout << sum(t) << endl;
return 0;
}
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