43 lines
823 B
C++
43 lines
823 B
C++
/**
|
||
* @file c++_examp.cpp
|
||
* @brief c++中的多态
|
||
* @author 光城
|
||
* @version v1
|
||
* @date 2019-08-06
|
||
*/
|
||
|
||
#include <iostream>
|
||
|
||
using namespace std;
|
||
class A
|
||
{
|
||
public:
|
||
virtual void f()//虚函数实现
|
||
{
|
||
cout << "Base A::f() " << endl;
|
||
}
|
||
};
|
||
|
||
class B:public A // 必须为共有继承，否则后面调用不到，class默认为私有继承！
|
||
{
|
||
public:
|
||
virtual void f()//虚函数实现,子类中virtual关键字可以没有
|
||
{
|
||
cout << "Derived B::f() " << endl;
|
||
}
|
||
};
|
||
|
||
|
||
int main()
|
||
{
|
||
A a;//基类对象
|
||
B b;//派生类对象
|
||
|
||
A* pa = &a;//父类指针指向父类对象
|
||
pa->f();//调用父类的函数
|
||
|
||
pa = &b; //父类指针指向子类对象，多态实现
|
||
pa->f();//调用派生类同名函数
|
||
return 0;
|
||
}
|