/////////////////////////////////////////////////////////////////////
// MT1Q3.cpp

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

class B
{ 
public: 
  virtual ~B() {}
  virtual const char* say() { return "B instance"; } 
};

class D : public B
{
  virtual const char* say() { return "D instance"; }
};

B* f() { return new D; }

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;
  B b = *(pB = f(d));
  std::cout << "\n  " << b.say();
  delete pB;

  std::cout << "\n  Creating an instance of D, bound to a B&:";
  B& rb = *f();
  std::cout << "\n  " << rb.say();
  delete &rb;

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