/////////////////////////////////////////////////////////////////////
// MT3Q3.cpp

#include <string>
#include <iostream>
#include <sstream>

class B
{ 
public: 
  virtual ~B() {}
  virtual void say() { std::cout << "\n  B instance"; } 
};

class D : public B
{
  virtual void say() { std::cout << "\n  D instance"; }
};

B* f(const D& d) { return new D(d); }

void main()
{
  std::cout << "\n  Creating a copy of an instance of D, then sliced to a B:";
  B* pB;
  D d;
  (*(pB = f(d))).say();
  delete pB;
  B b = *(pB = f(d));
  b.say();
  delete pB;

  std::cout << "\n\n";
}
  Creating a copy of an instance of D, then sliced to a B:
  D instance
  B instance