Factory Pattern

1.Factory模式两个最重要的功能

（1）定义创建对象的接口，封装了对象的创建。

（2）使得具体化类的工作延迟到了子类中。

2.Factory模式结构示意图

3.实现

 #ifndef _PRODUCT_H_

 #define _PRODUCT_H_

 class Product

 {

 public:

     virtual ~Product() = ;

 protected:

     Product();

 private:

 };

 class ConcreteProduct:public Product

 {

 public:

     ~ConcreteProduct();

     ConcreteProduct();

 protected:

 private:

 };

 #endif

Product.h

 #include "Product.h"

 #include <iostream>

 using namespace std;

 Product::Product()

 {

 }

 Product::~Product()

 {

 }

 ConcreteProduct::ConcreteProduct()

 {

     cout<<"ConcreteProduct..."<<endl;

 }

 ConcreteProduct::~ConcreteProduct()

 {

 }

Product.cpp

 #ifndef _FACTORY_H_

 #define _FACTORY_H_

 class Product;

 class Factory

 {

 public:

     virtual ~Factory() = ;

     virtual Product* CreateProduct() = ;

 protected:

     Factory();

 private:

 };

 class ConcreteFactory:public Factory

 {

 public:

     ~ConcreteFactory();

     ConcreteFactory();

     Product* CreateProduct();

 protected:

 private:

 };

 #endif

Factory.h

 #include "Factory.h"

 #include "Product.h"

 #include <iostream>

 using namespace std;

 Factory::Factory()

 {

 }

 Factory::~Factory()

 {

 }

 ConcreteFactory::ConcreteFactory()

 {

     cout<<"ConcreteFactory....."<<endl;

 }

 ConcreteFactory::~ConcreteFactory()

 {

 }

 Product* ConcreteFactory::CreateProduct()

 {

     return new ConcreteProduct();

 }

Factory.cpp

巴特西

Factory Pattern

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