/************************************************************************
 ***   FILE: obj_polymorphism.cpp
 ***   DATE: 03/07/2004
 *** AUTHOR: Daniel Dementiev
 ***   GOAL: This ptogram was designed to illustrate that ordinary
 ***         objects are not actually polymorhic in C++, only pointers
 ***         and references are.
 ************************************************************************/

#include <iostream>
using namespace std;

class A {
   private:
      int a;
   public:
      A() : a(0) {};
      A(int v) : a(v) {};
      virtual void print() { cout<<"Object A("<<a<<")\n"; };
};

class B : public A {
   private:
      int b;
   public:
      B() : b(0) {};
      B(int v) : A(v/2), b(v) {};
      virtual void print() { cout<<"Object B("<<b<<")\n"; };
};

void main()
{
   B b(10);
   A a = b;     // this is allowed because B is A, but all B's fields will be cut
   A &ra = b;
   A *pa = &b;

   a.print();   // A::print() is used, because objects are not polymorhic
   ra.print();  // B::print() is used
   pa->print(); // B::print() is used
}
void main()