C++虛函數的預設參數問題

標籤：虛函數的預設參數

#include "stdafx.h"#include <iostream>#include <algorithm>using namespace std;class Base{public:Base(int i):m_num(i){cout<<"Base Constructor"<<endl;}virtual ~Base(){cout<<"Base Deconstructor"<<endl;}virtual void func(int num=-100){cout<<num<<endl;cout<<"This is Base class"<<endl;}private:int m_num;};class Derived:public Base{public:Derived():Base(10){cout<<"Derived constructor"<<endl;}~Derived(){cout<<"Derived deconstructor"<<endl;}void func(int num=100){cout<<num<<endl;cout<<"This is Derived class"<<endl;}};int main(){{Base* pb=new Derived();cout<<"-------------------------"<<endl;pb->func();cout<<"-------------------------"<<endl;Derived* pd=dynamic_cast<Derived*>(pb);pd->func();cout<<"-------------------------"<<endl;delete pb;}system("pause");return 0;}

總結：

虛函數的預設參數，與調用該虛函數的指標類型對應