设计模式12、代理模式 Proxy

#pragma once
#include 
// 电信运营商
class ITelco
{
public:
       virtual ~ITelco() {}
       virtual void Recharge(int money) = 0;  // 充值
};
// 中国移动
class CMCC : public ITelco
{
public:
    void Recharge(int money) override {
        std::cout << "Recharge " << money;
    }
};
// 代理点
class Proxy : public ITelco
{
public:
    Proxy() : m_pCMCC(NULL) {}
    ~Proxy() { delete m_pCMCC; }
    // 低于 50 不充
    void Recharge(int money) override {
        if (money >= 50) {
            if (m_pCMCC == NULL)
                m_pCMCC = new CMCC();
            m_pCMCC->Recharge(money);
        }
        else {
            std::cout << "Sorry, too little money" << std::endl;
        }
    }
private:
    CMCC* m_pCMCC;
};
 
#include "subject.h"
#ifndef SAFE_DELETE
#define SAFE_DELETE(p) { if(p){delete(p); (p)=NULL;} }
#endif
int main()
{
       Proxy* proxy = new Proxy();
       proxy->Recharge(20);
       proxy->Recharge(100);
       SAFE_DELETE(proxy);
       getchar();
       return 0;
}