/////////////////////////////////////////////////////////////////////
// MT4Q9.cpp

#include <iostream>

class B
{
public:
  virtual ~B() {}
  virtual void say()
  {
    std::cout << "\n  I am a " << typeid(*this).name() << " instance";
  }
};

class D : public B
{
};

B* Creator() { return new D; }

void main()
{
  B* pB = Creator();
  pB->say();
  std::cout << "\n\n";
}