44 lines
996 B
C++
44 lines
996 B
C++
/**
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* @file c++_examp.cpp
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* @brief c++中的多态
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* @author 光城
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* @version v1
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* @date 2019-08-06
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*/
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#include <iostream>
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using namespace std;
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class A
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{
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public:
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virtual void f()//Implement a virtual function
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{
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cout << "Base A::f() " << endl;
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}
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};
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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！
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{
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public:
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virtual void f()//Virtual function implementation, virtual keyword in subclass can not be appearence
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{
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cout << "Derived B::f() " << endl;
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}
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};
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int main()
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{
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A a;//Base class object
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B b;//an object of derived type
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A* pa = &a;//The parent class pointer points to the parent object
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pa->f();//Call the function of the parent class
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pa = &b; //The parent class pointer points to the subclass object, which is implemented in polymorphism
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pa->f();//Call the function with the same name of the derived class
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return 0;
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}
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