#include <iostream>

// this is a virtual class

class VirtualClass

{

public:

VirtualClass(){};

~VirtualClass(){};

virtual void PrintSelf()=0;

};

// this is child class inherented from virtual class

class ChildClass:public VirtualClass

{

public:

void PrintSelf() { std::cout << "this is child class" << std::endl;};

};

// this is user class who has a member pointer to virtual base class

// this member is initialized in instructor

class UserClass

{

public:

UserClass(VirtualClass *virtualObj){m_virtualObj = virtualObj;};

void UserPrint()

{

m_virtualObj->PrintSelf();

};

private:

VirtualClass *m_virtualObj;

};

// this is a test class with a member of child class object

class TestClass

{

public:

TestClass(){user = new UserClass(&child);};

~TestClass(){delete user;};

void TestPrint()

{

user->UserPrint();

};

private:

ChildClass child;

UserClass* user;

int temp;

};

int main()

{

TestClass test;

test.TestPrint();

return 0;

}