读程序写结果---虚拟继承

#include <iostream>

using namespace std;


class Vehicle

{

    public:

        Vehicle(int weight = 0)

        {

            Vehicle::weight = weight;

            cout<<"载入Vehicle类构造函数"<<endl;

        }

        void SetWeight(int weight)

        {

            cout<<"重新设置重量"<<endl;

            Vehicle::weight = weight;

        }

        virtual void ShowMe() = 0;

    protected:

        int weight;

};

class Car:virtual public Vehicle//汽车，这里是虚拟继承

{

    public:

        Car(int weight=0,int aird=0):Vehicle(weight)

        {

            Car::aird = aird;

            cout<<"载入Car类构造函数"<<endl;

        }

        void ShowMe()

        {

            cout<<"我是汽车！"<<endl;

        }

    protected:

        int aird;

};



class Boat:virtual public Vehicle//船,这里是虚拟继承

{

    public:

        Boat(int weight=0,float tonnage=0):Vehicle(weight)

        {

            Boat::tonnage = tonnage;

            cout<<"载入Boat类构造函数"<<endl;

        }

        void ShowMe()

        {

            cout<<"我是船！"<<endl;

        }

    protected:

        float tonnage;

};



class AmphibianCar:public Car,public Boat//水陆两用汽车,多重继承的体现

{

    public:

        AmphibianCar(int weight,int aird,float tonnage)

        :Vehicle(weight),Car(weight,aird),Boat(weight,tonnage)

        //多重继承要注意调用基类构造函数

        {

            cout<<"载入AmphibianCar类构造函数"<<endl;

        }

        void ShowMe()

        {

            cout<<"我是水陆两用汽车！"<<endl;

        }

        void ShowMembers()

        {

            cout<<"重量："<<weight<<"吨，"<<"空气排量："<<aird<<"CC，"<<"排水量："<<tonnage<<"吨"<<endl;

        }

};

int main()

{

    AmphibianCar a(4,200,1.35f);

    a.ShowMe();

    a.ShowMembers();

    a.SetWeight(3);

    a.ShowMembers();

    cout << sizeof(Vehicle ) << endl;

    cout << sizeof(Car ) << endl;

    cout << sizeof(Boat) << endl;

    cout << sizeof(AmphibianCar) << endl;

}

/*

我们在Car类和Boat类继承Vehicle类时，在前面加上virtual关键字就可以实现虚拟继承，使用虚拟继承后，当系统碰到多重继承的时候就会自动先加入一个Vehicle的拷贝，当再次请求一个Vehicle的拷贝的时候就会被忽略，保证继承类成员函数的唯一性。

*/

 

载入Vehicle类构造函数

载入Car类构造函数

载入Boat类构造函数

载入AmphibianCar类构造函数

我是水陆两用汽车！

重量：4吨，空气排量：200CC，排水量：1.35吨

重新设置重量

重量：3吨，空气排量：200CC，排水量：1.35吨