#include <iostream>



class Hond {

public:

	virtual ~Hond() {

	}

	virtual void blaf() const {

		std::cout<<"Blaf."<<std::endl;

	}

// ...

};



class SintBernard: public Hond {

public:

	SintBernard(int w=10): whisky(w) {

	}

	virtual void blaf() const {

		std::cout<<"Woef!"<<std::endl;

	}

	int geefDrank() {

		std::cout<<"Geeft drank."<<std::endl;

		int i(whisky);

		whisky=0;

		return i;

	};

// ...

private:

	int whisky;

};



void geefHulp(Hond* hp) {

	hp->blaf();

	SintBernard* sbp(dynamic_cast<SintBernard*>(hp));

	if (sbp)

		std::cout<<sbp->geefDrank()<<" liter."<<std::endl;

}



int main() {

	Hond* borisPtr(new SintBernard);

	geefHulp(borisPtr);

	delete borisPtr;

	std::cin.get();

	borisPtr=new Hond;

	geefHulp(borisPtr);

	delete borisPtr;

	std::cin.get();

	return 0;

}



/*

Output:



Woef!

Geeft drank.

10 liter.



Blaf.



*/