c++开发模式，装饰模式

装饰模式概述：装饰模式是动态地将责任添加到具体对象上而不影响这个对象所对应的类或者基类的方法。当需要拓展功能的时候，提供了一种比传统继承方式更为灵活的选择。

#include <iostream>
using namespace std;

class Component {
public:
    virtual void Operation() = 0;
    virtual ~Component() { }
};

class ConcreteComponent :public Component {
public:
    void Operation() {
        cout << "ConcreteComponent::Operation..." << endl;
    }
};

class Decorator {
public:
    virtual void Operation() = 0;
    virtual void AddBehavior() = 0;
    virtual ~Decorator() { }
};

class ConcreteDecorator :public Decorator {
public:
    ConcreteDecorator(Component *com) {
        _com = com;
    }

    void AddBehavior() {
        cout << "ConcreteDecorator::AddBehavior..." << endl;
    }

    void Operation() {
        cout << "ConcreteDecorator::Operation..." << endl;
        AddBehavior();
        _com->Operation();
    }
private:
    Component *_com;
};

int main() {
    Component *con = new ConcreteComponent();
    Decorator *dec = new ConcreteDecorator(con);
    dec->Operation();

    delete con;
    delete dec;

    return 0;
}