标签:关系 namespace 增加 run delete detail tar rtu 功能
装饰( Decorator )模式又叫做包装模式。通过一种对客户端透明的方式来扩展对象的功能,是继承关系的一个替换方案。
装饰模式就是把要添加的附加功能分别放在单独的类中,并让这个类包含它要装饰的对象,当需要执行时,客户端就可以有选择地、按顺序地使用装饰功能包装对象。
适用于:
装饰者模式(Decorator Pattern)动态的给一个对象添加一些额外的职责。就增加功能来说,此模式比生成子类更为灵活。
//给跑车,额外添加游泳、飞行的功能
#include <iostream> using namespace std; class Car { public: virtual void show() = 0; protected: private: }; class RunCar : public Car { public: void run() { cout << "可以跑" << endl; } virtual void show() { run(); } protected: private: }; class SwimCarDirector : public Car { public: SwimCarDirector(Car *p) { m_p = p; } void swim() { cout << "可以游" << endl; } virtual void show() { m_p->show(); swim(); } private: Car *m_p; }; class FlyCarDirector : public Car { public: FlyCarDirector(Car *p) { m_p = p; } void fly() { cout << "可以飞" << endl; } virtual void show() { m_p->show(); fly(); } private: Car *m_p; }; void main() { Car *runcar = NULL; runcar = new RunCar; runcar->show(); cout <<"车开始装饰swim"<<endl; SwimCarDirector *swimCar = new SwimCarDirector(runcar); swimCar->show(); cout <<"车开始装饰fly"<<endl; FlyCarDirector *flyCar = new FlyCarDirector(swimCar); flyCar->show(); delete flyCar; delete swimCar; delete runcar; return ; }
标签:关系 namespace 增加 run delete detail tar rtu 功能
原文地址:https://www.cnblogs.com/gd-luojialin/p/10357965.html