设计模式学习<六>C++实现--bridge模式

结构型模式-bridge设计模式

bridge模式实现类图如下：

在如上类图中，refinedAbstraction类代表了windows操作系统，该类中维护了一个指向abstractImplement的指针，这样就可以自由的调用下面的具体的方法了。

如果用户突然想给windows系统增加一个计算器功能，这样我们就只需要给abstractimplement添加一个子类实现计算器的功能就行。

如果用户突然又想，实现mac操作系统，这样我们只需在abstract中添加一个mac的子类，这样mac类中就可以通过一个指向abstractimplement的指针实现上面的功能。

以上是我的理解。

参考代码：（来自http://blog.csdn.net/feiyinzilgd/article/details/6227664）

 1 #pragma once  
 2 //Abstraction.h  
 3 class Abstraction  
 4 {  
 5 public:  
 6     Abstraction(void){};  
 7     virtual ~Abstraction(void){};  
 8   
 9     virtual void Operation() = 0;  
10 };
Abstraction
 1 #pragma once  
 2   
 3 //RefinedAbstraction.h  
 4 #include "abstraction.h"  
 5 #include "Implementor.h"  
 6   
 7 class Implementor;  
 8   
 9 class RefinedAbstraction :  
10     public Abstraction  
11 {  
12 public:  
13     RefinedAbstraction(void);  
14     RefinedAbstraction(Implementor *imp);  
15     ~RefinedAbstraction(void);  
16   
17     void Operation();  
18   
19 private:  
20     Implementor *m_imp;  
21   
22 };
RefinedAbstraction 
 1 #include <iostream>  
 2 #include "RefinedAbstraction.h"  
 3   
 4 using namespace std;  
 5   
 6 //RefinedAbstraction.cpp  
 7 RefinedAbstraction::RefinedAbstraction(void)  
 8 {  
 9     m_imp = NULL;  
10       
11 }  
12   
13 RefinedAbstraction::~RefinedAbstraction(void)  
14 {  
15 }  
16   
17 RefinedAbstraction::RefinedAbstraction(Implementor *imp)  
18 {  
19     m_imp = imp;  
20 }  
21   
22 void RefinedAbstraction::Operation()  
23 {  
24     m_imp->OperationImp();  
25 }
RefinedAbstraction.cpp
 1 #pragma once  
 2 //Implementor.h  
 3 class Implementor  
 4 {  
 5 public:  
 6     Implementor(void){};  
 7     virtual ~Implementor(void){};  
 8  
 9     virtual void OperationImp() = 0;  
10 };
Implementor 
 1 #pragma once  
 2   
 3 //ConcreteImplementorA.h  
 4 #include "implementor.h"  
 5   
 6 class ConcreteImplementorA :  
 7     public Implementor  
 8 {  
 9 public:  
10     ConcreteImplementorA(void);  
11     ~ConcreteImplementorA(void);  
12   
13     void OperationImp();  
14 };
ConcreteImplementorA 
 1 #pragma once  
 2   
 3 //ConcreteImplementorB.h  
 4 #include "implementor.h"  
 5   
 6 class ConcreteImplementorB :  
 7     public Implementor  
 8 {  
 9 public:  
10     ConcreteImplementorB(void);  
11     ~ConcreteImplementorB(void);  
12   
13     void OperationImp();  
14 };
ConcreteImplementorB
 1 #include <iostream>  
 2 #include "ConcreteImplementorA.h"  
 3   
 4 using namespace std;  
 5   
 6 //ConcreteImplementonA.cpp  
 7 ConcreteImplementorA::ConcreteImplementorA(void)  
 8 {  
 9 }  
10   
11 ConcreteImplementorA::~ConcreteImplementorA(void)  
12 {  
13 }  
14   
15 void ConcreteImplementorA::OperationImp()  
16 {  
17     cout << "Hi, I am in ConcreteImplementorA" << endl;  
18 }
ConcreteImplementorA.cpp
 1 #include <iostream>  
 2 #include "ConcreteImplementorB.h"  
 3   
 4 using namespace std;  
 5   
 6   
 7 //ConcreteImplementorB.cpp  
 8 ConcreteImplementorB::ConcreteImplementorB(void)  
 9 {  
10 }  
11   
12 ConcreteImplementorB::~ConcreteImplementorB(void)  
13 {  
14 }  
15   
16 void ConcreteImplementorB::OperationImp()  
17 {  
18     cout << "Hi, I am in ConcreteImplementorB" << endl;  
19 }
ConcreteImplementorB.cpp
 1 #include "Abstraction.h"  
 2 #include "ConcreteImplementorA.h"  
 3 #include "ConcreteImplementorB.h"  
 4 #include "RefinedAbstraction.h"  
 5   
 6 //main.cpp  
 7 int main()  
 8 {  
 9   
10     ConcreteImplementorA *pImpA = new ConcreteImplementorA;  
11     ConcreteImplementorB *pImpB = new ConcreteImplementorB;  
12     Abstraction *objA = new RefinedAbstraction(pImpA);  
13     Abstraction *objB = new RefinedAbstraction(pImpB);  
14   
15     objA->Operation();  
16     objB->Operation();  
17       
18 }
main

 

posted @ 2013-05-23 12:01  mengmee  阅读(187)  评论(0)  编辑  收藏  举报