40 lines
756 B
C++
40 lines
756 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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public:
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virtual void f() //虚函数实现
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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() //虚函数实现,子类中virtual关键字可以没有
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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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A a; //基类对象
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B b; //派生类对象
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A *pa = &a; //父类指针指向父类对象
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pa->f(); //调用父类的函数
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pa = &b; //父类指针指向子类对象，多态实现
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pa->f(); //调用派生类同名函数
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return 0;
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}
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