#include <iostream>

class Base {
public:
	virtual void foo() {
		std::cout << "base" << std::endl;
	}
};

class Derived : public Base {
public:
	void foo() override {
		std::cout << "derived" << std::endl;
		Base::foo();
	}
};

int main(int argc, char** argv) {
	Derived d;
	Base* b = &d;
	b->foo();
	return 0;
}