装饰模式

#include<iostream>
using namespace std;
class Car
{
public:
    virtual void show() = 0;
};
class Runcar:public Car
{
public:
    void run()
    {
        cout << "run" << endl;
    }
    virtual void show()
    {
        run();
    }
};
class Flycar :public Car
{
public:
    Flycar(Car * p)
    {
        m_p = p;
    }
    void fly()
    {
        cout << "fly" << endl;
    }
    virtual void show()
    {
        m_p->show();
        fly();
    }
private:
    Car * m_p;
};
int main()
{
    Runcar * runCar = new Runcar;
    runCar->show();
    //给runCar添加飞行功能
    printf("==========\n");
    Flycar * flyCar = new Flycar(runCar);
    flyCar->show();
    delete runCar;
    delete flyCar;

    system("pause");
    return 0;
}