#include<iostream>
using namespace std;class base
{public:base(){};virtual ~base(){};
};// 在类声明中声明纯虚析构函数
//base::~base() {}class father: public base
{public:~father(){cout << "father" << endl;}
};int main()
{base* a;a=new father();delete a;}

#include<iostream>
using namespace std;class base
{public:base(){};~base(){};
};// 在类声明中声明纯虚析构函数
//base::~base() {}class father: public base
{public:~father(){cout << "father" << endl;}
};int main()
{base* a;a=new father();delete a;}