装饰者模式

　　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。

/*装饰者模式*/
class Car
{
public:
    virtual void show() = 0;
};

class RunCar : public Car
{
public:
    virtual void show()
    {
        cout<<"可以跑"<<endl;
    }
};

class SwimCarDirector : public Car
{
public:
    SwimCarDirector(Car *car)
    {
        m_car = car;
    }

    void swim()
    {
        cout<<"可以游泳"<<endl;
    }

    virtual void show()
    {
        m_car->show();
        swim();
    }
private:
    Car *m_car;
};


class FlyCarDirector : public Car
{
public:
    FlyCarDirector(Car *car)
    {
        m_car = car;
    }
    void fly()
    {
        cout<<"可以飞"<<endl;
    }
    virtual void show()
    {
        m_car->show();
        fly();
    }
private:
    Car *m_car;
};