//  B2_10.cpp

#include <iostream>
using namespace std;

class B { 
  
  int x;  // data members needed to show the
          // indexing error, e.g., class objects
          // need to be different sizes

public:
  virtual ~B() {}
  virtual void mf() { cout << "\n  B::mf()"; }
};

class D : public B {

  int y;

  virtual void mf() { cout << "\n  D::mf()"; }
};


D* fun() { D *pD = new D[2]; return pD; }  // B2 #10 corrected in class
                                           // to include return statement
void main() {

  B *pB = fun();
  pB[0].mf();
//  pB[1].mf();    memory access violation because B objects
//                 are not the same size as D objects
  cout << "\n\n";
}