Proxy 设计模式

注意和Adapter 的区别，这个两个有共用的基类

和Decade很相似，只不过一个的功能是增加新的， 一个是代理。

# pragma once#include <iostream>using namespace std;class Subject{public:virtual ~Subject() {};virtual void Request()=0 ;protected:Subject() {};};class ConcreteSubject: public Subject{public:ConcreteSubject() {};~ConcreteSubject() {};virtual void Request(){cout<<"ConcreteSubject"<<endl;}};class Proxy: public Subject{public:Proxy() { su=NULL;};~Proxy() {delete su;su=NULL;}void Request() {Subject* su=new ConcreteSubject();su->Request();}private:Subject* su;};int main(int argc, char* argv[]){Proxy* pr= new Proxy();pr->Request();return 0;}