C++设计模式之工厂方法模式

 1 #pragma once
 2 /*背景风格抽象类*/
 3 class CBackgroundStyle
 4 {
 5 public:
 6     virtual void DisplayStyle() = 0;//纯虚函数
 7 };
 8 
 9 
10 /*背景风格抽象工厂 */
11 class StyleFactory
12 {
13 public:
14     //工厂方法，具体背景风格的创建过程由子类完成  
15     virtual CBackgroundStyle* CreateBackgroundStyleFactory() = 0;
16     void DisplayStyle()
17     {//显示风格
18         m_pBackgroundStyle = CreateBackgroundStyleFactory();
19         m_pBackgroundStyle->DisplayStyle();
20     }
21 
22 public:
23     StyleFactory():m_pBackgroundStyle(NULL)
24     {
25 
26     }
27     ~StyleFactory()
28     {
29         if(NULL != m_pBackgroundStyle)
30         {
31             delete m_pBackgroundStyle;
32             m_pBackgroundStyle = NULL;
33         }
34     }
35 
36 private:
37     //保存创建的背景风格
38     CBackgroundStyle* m_pBackgroundStyle;
39 };

 1 //FashionStyle.h
 2 #pragma once
 3 /*潮流风格背景类 */
 4 class CFashionStyle: public CBackgroundStyle
 5 {
 6 public:
 7     CFashionStyle(void);
 8     ~CFashionStyle(void);
 9 public:
10     virtual void DisplayStyle();
11 };
12 
13 /*潮流风格工厂*/
14 class FashionStyleFactory: public StyleFactory
15 {
16     virtual CBackgroundStyle* CreateBackgroundStyleFactory()
17     {
18         CBackgroundStyle* pFashionStyle = new CFashionStyle();
19         return pFashionStyle;
20     };
21 };

 1 #include "StdAfx.h"
 2 #include "BackgroundStyle.h"
 3 #include "FashionStyle.h"
 4 
 5 CFashionStyle::CFashionStyle(void)
 6 {
 7 }
 8 
 9 
10 CFashionStyle::~CFashionStyle(void)
11 {
12 }
13 
14 void CFashionStyle::DisplayStyle()
15 {
16     AfxMessageBox(_T("潮流风格背景"));
17 }

1 void CLoadDllDemoDlg::OnBnClickedButton18()
2 {//工厂模式
3     StyleFactory* pFactory = new FashionStyleFactory();
4     pFactory->DisplayStyle();
5     delete pFactory;
6     pFactory = NULL;
7 }