#include <iostream>
using namespace std;
class Base {
    void            foo() {
        bar();
    }
    public:
    virtual void    bar() {
        cout << "base";
    }
};
 
class Derived:public Base
{
	public:
    virtual void    bar() {
        cout << "derived";
    }
};
 
 
 
int main() {
    Derived* derived = new Derived();
    Base* bas = derived;
    bas->Base::bar(); //вызвали базовый
    cout << endl;
    bas->bar();       //вызвали производный
}

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