// A2.7.cpp : Defines the entry point for the console application.
//

#include "stdafx.h"
#include <iostream>
using namespace std;

// Define a base class B and two derived classes D1 and D2 so that 
// B provides a function, showType, that displays the type of  any
// class that derives from B.  a client uses the function as shown below.  
//
// B should not have to know the names of the derived classes:
//
// D1 d1;  d1.showType();	// shows type of d1;
// D2 d2;  d2.showType();	// shows type of d2;

template <class T> class B { 
  public: 
    void showType() { 
      cout << "\n  " << typeid(T).name();  // derived type
    }
};
class D1 : public B<D1> { };
class D2 : public B<D2> { };

class B2 { // must define virtual somewhere to get dynamic typeid
public:
  virtual ~B2() {}

  // since class has vtble, this points to dynamic type
  void showType() { 
    cout << "\n  my type is " << typeid(*this).name();
  };
};

class D3 : public B2 {};
class D4 : public B2 {};

int _tmain(int argc, _TCHAR* argv[])
{
  std::cout << "\n  Exam A2 - Question #7 "
            << "\n =======================\n";

  D1().showType();
  D2().showType();

  D3().showType();
  D4().showType();

  cout << "\n\n";
	return 0;
}