1  struct A
       2  {
       3    A ();
       4    ~A ();
       5  };
       6  
       7  struct B
       8  {
       9    A b;
      10    virtual void mb ();
      11    B (int);
      12    virtual ~B ();
      13  };
      14  
      15  struct C : public B
      16  {
      17    virtual void mc ();
      18    C (int);
      19    ~C ();
      20  };
      21  
      22  inline C::~C () {}
      23  
      24  struct D : public C
      25  {
      26    A d;
      27    D (int);
      28    ~D ();
      29  };