c++多态性分型

#include<iostream>
using namespace std;
class base
{
public:
base(){prepare();cout<<"base new "<<endl;}
~base(){cleanup();cout<<"delete base"<<endl;}
virtual void prepare(){cout<<"base's prepare"<<endl;}
virtual void cleanup(){cout<<"base's clean up"<<endl;}
};

class temp:public base
{
public:
temp(){cout<<"temp new"<<endl;}
~temp(){cout<<"temp delete"<<endl;}
virtual void prepare(){cout<<"temp prepare"<<endl;}
virtual void cleanup(){cout<<"temp clean up"<<endl;}

};

 

int main()
{
base *p=new temp();
p->cleanup();
p->prepare();
delete p;
}

 

从这个例子可以比较清楚的看到调用的过程吧。。。