class A {
protected:
    int c(void) const { return 1;}
    int d(void) const { return 2;}
};

class B : private A {
public:
    using A::c;
};


int main()
{
    B b;

    int x;

    x = b.c();
    // x = b.d();
    // A &a = b;
    // x = a.d();

    return 0;
}