c++超基础：多态——上、虚函数

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一、多态的概念

多态：同样的调用行为，表现出不同的表现形态

二、江湖恩怨

不加virtual 关键字和加上virtual 关键字的区别

#include <iostream>using namespace std;class Boss{private:static Boss *Instance;Boss(){};public:static Boss* GetInstance(){if (NULL == Instance){Instance = new Boss();}return Instance;}int fight(){return 10;}};Boss *Boss::Instance = NULL;class Master{public:virtual int eightswordkill(){return 8;}};class NewMaster : public Master{public:virtual int eightswordkill(){return Master::eightswordkill() * 2;}};int PK(Master *p, Boss *q){int i = p->eightswordkill();int j = q->fight();if (i < j){cout<<"Master is killed."<<endl;}else{cout<<"Boss is killed."<<endl;}return 0;}int main(){Master master;Boss *boss = Boss::GetInstance();NewMaster newmaster;PK(&master, boss);PK(&newmaster, boss);return 0;}

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