C++设计模式之工厂方法模式

来自:http://blog.csdn.net/pangshaohua/article/details/38912555

参考写的一个工厂demo

1、定义"背景风格的抽象类"、"背景风格的抽象工厂"

 #pragma once
 /*背景风格抽象类*/
 class CBackgroundStyle
 {
 public:
     virtual void DisplayStyle() = ;//纯虚函数
 };

 /*背景风格抽象工厂 */
 class StyleFactory
 {
 public:
     //工厂方法，具体背景风格的创建过程由子类完成
     virtual CBackgroundStyle* CreateBackgroundStyleFactory() = ;
     void DisplayStyle()
     {//显示风格
         m_pBackgroundStyle = CreateBackgroundStyleFactory();
         m_pBackgroundStyle->DisplayStyle();
     }

 public:
     StyleFactory():m_pBackgroundStyle(NULL)
     {

     }
     ~StyleFactory()
     {
         if(NULL != m_pBackgroundStyle)
         {
             delete m_pBackgroundStyle;
             m_pBackgroundStyle = NULL;
         }
     }

 private:
     //保存创建的背景风格
     CBackgroundStyle* m_pBackgroundStyle;
 };

2、定义"潮流风格背景类"、"潮流风格工厂类"

//FashionStyle.h

 //FashionStyle.h
 #pragma once
 /*潮流风格背景类 */
 class CFashionStyle: public CBackgroundStyle
 {
 public:
     CFashionStyle(void);
     ~CFashionStyle(void);
 public:
     virtual void DisplayStyle();
 };

 /*潮流风格工厂*/
 class FashionStyleFactory: public StyleFactory
 {
     virtual CBackgroundStyle* CreateBackgroundStyleFactory()
     {
         CBackgroundStyle* pFashionStyle = new CFashionStyle();
         return pFashionStyle;
     };
 };

FashionStyle.cpp

 #include "StdAfx.h"
 #include "BackgroundStyle.h"
 #include "FashionStyle.h"

 CFashionStyle::CFashionStyle(void)
 {
 }

 CFashionStyle::~CFashionStyle(void)
 {
 }

 void CFashionStyle::DisplayStyle()
 {
     AfxMessageBox(_T("潮流风格背景"));
 }

//调用方式

 void CLoadDllDemoDlg::OnBnClickedButton18()
 {//工厂模式
     StyleFactory* pFactory = new FashionStyleFactory();
     pFactory->DisplayStyle();
     delete pFactory;
     pFactory = NULL;
 }

上图