设计模式入门,工厂模式,c++代码实现

// test04.cpp : Defines the entry point for the console application.
//
//设计模式第4章工厂模式
#include "stdafx.h"
#include <string>
#include <vector>
#include <iostream>
using namespace std;
class Pizza
{
public:
   string name;
   string dough;
   string sauce;
   vector<string> toppings;

void prepare()
   {
       cout<<"Preparing"<<name<<endl;
       cout<<"Tossing dough..."<<endl;
       cout<<"Adding sauce..."<<endl;
       cout<<"Adding toppings:"<<endl;
       for (int i = 0;i < toppings.size();i++)
       {
           cout<<toppings[i]<<endl;
       }
   }

void bake()
   {
       cout<<"Bake for 25 minutes at 350"<<endl;
   }

virtual void cut()
   {
       cout<<"Cutting ths pizza into diagonal slices"<<endl;
   }

void box()
   {
       cout<<"Please pizza in official PizzaStone box"<<endl;
   }

string getName()
   {
       return name;
   }
};

class PizzaStore
{
public:
   Pizza* orderPizza(string type)
   {
       Pizza* pizza;
       pizza = createPizza(type);

pizza->prepare();
       pizza->bake();
       pizza->cut();
       pizza->box();

return pizza;
}

protected:
virtual Pizza* createPizza(string type){return NULL;};//工厂模式的核心
};

class NYStyleCheesePizza : public Pizza
{
public:
   NYStyleCheesePizza(){
       name = "NY Style Sauce and Cheese Pizza";
       dough = "Thin Crust Dough";
       sauce = "Marinara Sauce";

toppings.push_back("Grated Reggiano Cheese");//上面覆盖的是意大利reggiano高级干酪
}
};

class ChicagoStyleCheesePizza : public Pizza
{
public:
   ChicagoStyleCheesePizza()
   {
       name = "Chicago Style Deep Dish Cheese Pizza";
       dough = "Extra Thick Crust Dough";
       sauce = "Plum Tomato Sauce";

toppings.push_back("Shredded Mozzarella Cheese");
}

void cut()
   {
       cout<<"Cutting the pizza into square slices"<<endl;
   }
};

class NYPizzaStore : public PizzaStore
{
   Pizza* createPizza(string item)
   {
       if (item == "cheese")
       {
           return new NYStyleCheesePizza();
       }
       /*else if (item == "veggie")
       {
           return new NYStyleVeggiePizza();
       }
       else if (item == "clam")
       {
           return new NYStyleClamPizza();
       }
       else if (item == "pepperoni")
       {
           return new NYStylePepperoniPizza();
       }*/
       else
       {
           return NULL;
       }
   }
};
class ChicagoPizzaStore : public PizzaStore
{
   Pizza* createPizza(string item)
   {
       if (item == "cheese")
       {
           return new ChicagoStyleCheesePizza();
       }
       else
       {
           return NULL;
       }
   }
};

//还有一种抽象工厂模式
int _tmain(int argc, _TCHAR* argv[])
{

PizzaStore* nyStore = new NYPizzaStore();
PizzaStore* chicagoStore = new ChicagoPizzaStore();

Pizza* pizza = nyStore->orderPizza("cheese");
cout<<"Ethan ordered a "<<pizza->getName()<<endl;

pizza = chicagoStore->orderPizza("cheese");
cout<<"Joel ordered a "<<pizza->getName()<<endl;
return 0;
}

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设计模式入门,工厂模式,c++代码实现

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