#ifndef _PIZZA_H

 #define _PIZZA_H

 #include <iostream>

 #include <string>

 class Pizza

 {

 public:

     Pizza(const std::string &type) : m_type(type) {}

     virtual ~Pizza() {}

     virtual void prepare() { std::cout << "prepare " << m_type << std::endl; }

     virtual void bake() { std::cout << "bake " << m_type << std::endl; }

     virtual void cut() { std::cout << "cut " << m_type << std::endl; }

     virtual void box() { std::cout << "box " << m_type << std::endl; }

 private:

     std::string m_type;

 };

 #endif

 #ifndef _CHEESE_PIZZA_H

 #define _CHEESE_PIZZA_H

 #include <iostream>

 #include "Pizza.h"

 class CheesePizza : public Pizza

 {

 public:

     CheesePizza() : Pizza("cheese") {}

     ~CheesePizza() {}

 };

 #endif

 #ifndef _GREEK_PIZZA_H

 #define _GREEK_PIZZA_H

 #include <iostream>

 #include "Pizza.h"

 class GreekPizza : public Pizza

 {

 public:

     GreekPizza() : Pizza("greek") {}

     ~GreekPizza() {}

 };

 #endif

 #ifndef _SIMPLE_PIZZA_FACTORY

 #define _SIMPLE_PIZZA_FACTORY

 #include "CheesePizza.h"

 #include "GreekPizza.h"

 class SimplePizzaFactory

 {

 public:

     Pizza *CreatePizza(const std::string & type)

     {

         if ( "cheese" == type )

         {

             return new CheesePizza();

         }

         if ( "greek" == type )

         {

             return new GreekPizza();

         }

         return NULL;

     }

 };

 #endif

 #ifndef _PIZZA_STORE_H

 #define _PIZZA_STORE_H

 #include "SimplePizzaFactory.h"

 class PizzaStore

 {

 private:

     SimplePizzaFactory pizza_factory;

 public:

     Pizza* OrderPizza(const std::string &type)

     {

         Pizza *p_pizza = pizza_factory.CreatePizza(type);

         if (p_pizza)

         {

             p_pizza->prepare();

             p_pizza->bake();

             p_pizza->cut();

             p_pizza->box();

         }

         return p_pizza;

     }

 };

 #endif

 #include "PizzaStore.h"

 int main()

 {

     PizzaStore pizza_store;

     Pizza *p_pizza = pizza_store.OrderPizza("greek");

     if ( p_pizza )

     {

         delete p_pizza;

     }

     return ;

 }