菱形继承与探索多态的原理

2019-11-08 19:45:05

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//菱形继承class Person { public: A() :_a(1) {} PRotected: int _a; }; class Student :virtual public Person { public: B() :_b(2) {} protected: int _b; }; class Teacher :virtual public Person { public: C() :_c(3) {} protected: int _c; }; class Assistant :public Teacher, public Student { public: D() :_d(4) {} protected: int _d; }; int main() { Assistant d; cout << sizeof(d) << endl; system("pause"); return 0; }

//多态的原理class Person{public:virtual void BuyTickets(){cout << "买票" << endl;}};class Student:public Person {public:virtual void BuyTickets(){cout << "买半价票" << endl;}};void fun(Person&p){p.BuyTickets();}int main(){Person p;Student s;fun(p);fun(s);}多态的实现原理自我感觉是靠虚函数的__vfptr来指向是调用基类还是派生类的...

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