#include <iostream>

class Actor
{
  public:
    void speak()
    //virtual void speak()
    {
      std::cout << "Actor::speak" << std::endl;
    }
};

class Marble : public Actor
{
  public:
    virtual void speak()
    {
      std::cout << "Marble::speak" << std::endl;
    }
};

int main(void)
{
  Marble *m = new Marble();
  Actor* children[1];
  children[0] = m;
  children[0]->speak();
}