class MyClass;

class Blocker {

      private:

            Blocker() {

            }

            friend class MyClass;

};

class MyClass: public virtual Blocker {

      // tagfuggvenyek es tagvaltozok...

};

#pragma warning(disable: 4102)

#include <iostream>

using namespace std;

class Base {

      public:

            Base() {

            }

            virtual void func() {

                  cout << "Base func called!\n";

            }

};

class Derived : public Base {

      public:

            Derived() {

            }

            virtual void func() {

                  Base:func();

                  cout << "Derived func called!\n";

            }

};

int main() {

      Derived d;

      d.func();

}

void Func(int n)

{

 if (n <= 1) 

   throw 1;

 try {

      Func(n - 1);

     }

 catch (int n1) {

                 try {

                      Func(n - 2);

                     }

                 catch (int n2) {

                                 throw n1 + n2;

                                }

                }

}