Proxy Pattern

1.Proxy Pattern最大的好处就是实现了逻辑和实现的彻底解耦。

2.Proxy Pattern结构图

3.实现

 #ifndef _PROXY_H_
 #define _PROXY_H_

 class Subject
 {
 public:
     virtual ~Subject();
     virtual void Request() = ;
 protected:
     Subject();
 private:
 };

 class ConcreteSubject:public Subject
 {
 public:
     ConcreteSubject();
     ~ConcreteSubject();
     void Request();
 protected:
 private:
 };

 class Proxy:public Subject
 {
 public:
     Proxy();
     Proxy(Subject* sub);
     ~Proxy();
     void Request();
 protected:
 private:
     Subject* _sub;
 };

 #endif

Proxy.h

 #include "Proxy.h"
 #include <iostream>
 using namespace std;

 Subject::Subject()
 {

 }
 Subject::~Subject()
 {

 }
 ConcreteSubject::ConcreteSubject()
 {

 }
 ConcreteSubject::~ConcreteSubject()
 {

 }
 void ConcreteSubject::Request()
 {
     cout<<"ConcreteSubject......request ...."<<endl;
 }
 Proxy::Proxy()
 {

 }
 Proxy::Proxy(Subject* sub)
 {
     _sub = sub;
 }
 Proxy::~Proxy()
 {
     delete _sub;
 }
 void Proxy::Request()
 {
     cout<<"Proxy request...."<<endl;
     _sub->Request();
 }

Proxy.cpp

 #include "Proxy.h"
 #include <iostream>
 using namespace std;

 int main(int argc,char* argv[])
 {
     Subject* sub = new ConcreteSubject();
     Proxy* p = new Proxy(sub);
     p->Request();
     return ;
 }

main.cpp