设计模式之代理模式（Proxy Pattern）

　　定义：为其他对象提供一种代理以控制这个对象的访问，也叫做委托模式。

　　咱们比作游戏，通俗讲代理模式就是，一个主题虚基类派生出两个子类，一个玩家类，实现相关操作，一个是代练类，代替执行玩家相关操作，代练类对象有个指向玩家类对象的指针，可以通过调用代练类对象，实现玩家不登录，游戏照样打怪升级。。。。　　

using namespace std;
//游戏主题类
class Game
{
public:Game() {}virtual ~Game() {}virtual void begin_time() = 0;virtual void login() = 0;virtual void killBoss() = 0;virtual void upGrade() = 0;virtual void end_time() = 0;
};//游戏实例
class RealGame : public Game
{
public:RealGame(string username, string password) {this->userName = username;this->password = password;}~RealGame() {}//上线virtual void begin_time() { printf("开始时间： 2017/3/20 19:34
"); }//登录virtual void login() { cout <<"用户: " <"登录游戏"<< endl;}//打怪virtual void killBoss() { cout << userName << "打死领主"锤王菠萝丁！"" << endl;}//升级virtual void upGrade() { cout << userName << "升级到89级！" << endl;}//下线virtual void end_time() {cout <<"2017/3/20 21:12 玩家"<< userName << "退出游戏" << endl;}private:string userName;string password;
};//游戏代练者
class Proxy : public Game
{
public:Proxy(string userName, string password){pRealGame = new RealGame(userName, password);}~Proxy() {delete pRealGame;pRealGame = nullptr;}virtual void begin_time() {pRealGame->begin_time();}virtual void login(){pRealGame->login();}virtual void killBoss(){pRealGame->killBoss();}virtual void upGrade(){pRealGame->upGrade();}virtual void end_time(){pRealGame->end_time();}private:RealGame *pRealGame;
};int main()
{Game *m_game = new Proxy("张三","******");m_game->begin_time();m_game->login();m_game->killBoss();m_game->upGrade();m_game->end_time();delete m_game;m_game = nullptr;
}