#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;
	
}