#include <typeinfo>

#include <iostream>

using namespace std;

class A {

  public:

    void f () {

        cout << "Ich bin f() in der Klasse A\n";

    }

};

class B:public A {

  public:

    void f () {

        cout << "Ich bin f() in der Klasse B\n";

    }

};

class C {

  public:

    void f () {

        cout << "Ich bin auch ein f()\n";

    }

};

int main ()

{

    A *ap = new A ();

    B *bp = new B ();

    // instanceof

    C *cp = dynamic_cast < A * >(bp);

    if (cp != NULL)

        cp->f ();

    return 0;

}