1、例子1

#include <iostream>
class A
{
public:const char* fetchClassName() { return "A"; }
};class B: public A
{
public:const char* fetchClassName() { return "B"; }
};int main(void)
{B obj_b;A &obj_a = obj_b;std::cout << obj_a.fetchClassName() << "\n";
}

 

运行结果
A

 

 

 

 

2、例子2

 

 

 

#include <iostream>class A
{
public:virtual const char* fetchClassName() { return "A"; }
};class B: public A
{
public:virtual const char* fetchClassName() { return "B"; }
};int main(void)
{B obj_b;A &obj_a = obj_b;std::cout << obj_a.fetchClassName() << "\n";
}

 

 

运行结果
B