#include <iostream>

using namespace std;

struct A
{ 
   A()  {cout << "A() C-tor" << endl;} 
   ~A(){cout << "~A() D-tor" << endl;} 
}; 

struct B : public A
{ 
   B(){cout << "B() C-tor" << endl;} 
   ~B(){cout << "~B() D-tor" << endl;} 
   // A a; 
};

int main()
{ 
   B b; 
}