多态性8-526互联

#include<iostream>
#include<typeinfo>
using namespace std;
class Base{
public:
virtual ~Base() {}
};
class Derived:public Base{};
void fun(Base *b){
const type_info &info1=typeid(b);
const type_info &info2=typeid(*b);
cout<<"typeid(b): "<<info1.name()<<endl;
cout<<"typeid(*b): "<<info2.name()<<endl;
if(info2==typeid(Base))
cout<<"A base class!"<<endl;
}
int main()
{
Base b;
fun(&b);
Derived d;
fun(&d);
return 0;
}