MOOC清华《面向对象程序设计》第4章：虚析构函数实验

#include <iostream>
using namespace std;

class B{
public:
virtual void show(){
cout << "B.show()\n";
}
virtual ~B(){
cout << "~B()\n";
}
};

class D:public B{
public:
void show(){
cout << "D.show()\n";
}
~D(){
cout << "~D()\n";
}
};

void test(B* ptr){
ptr->show();
}

int main(){
B* ptr = new D;
test(ptr);
delete ptr;

return 0;
}