// File: ex7-11.cpp

#include <iostream>
using namespace std;

class B
{
protected:
    int b;
public:
    B()
    {
        cout << "B ctor called for " << this << endl;
        b = 0;
    }
    virtual void virt()
    {
        cout << "B::virt() called for " << this << endl;
    }
};

class D : public B
{
protected:
    int d;
public:
    D()
    {
        cout << "D ctor called for " << this << endl;
        d = 0;
    }
    void non_virt2()
    {
        cout << "D::non_virt2() called for " << this << endl;
    }
};

int main()
{
    B b;			 // declare a base object

    D d;			 // declare a derived object


    b.virt();		 // invoke virt() through a base object

    d.virt();		 // invoke virt() through a derived object


    B* pb;			 // pb is a pointer to a base class object

    pb = &b;		 // pb points to b


    pb->virt();		 // invoke virt() through a base pointer

    //   to a base object


    pb = &d;		 // pb points to d

    pb->virt();		 // invoke virt() through a base pointer

    //   to a derived object


    cout << "size of b = " << sizeof b << endl;
    cout << "size of d = " << sizeof d << endl;
    d.non_virt2();	 // invoke non_virt2() through derived object

//  pb->non_virt2(); Error:  non_virt2() is not a member of B

}