1  struct B
       2  {
       3    int x;
       4    B (int);
       5    ~B ();
       6  };
       7  
       8  struct C1 : public B {
       9    C1 (int);
      10  };
      11  
      12  struct C2 : public B {
      13    C2 (int);
      14  };
      15  
      16  struct D : public B {
      17    D (int);
      18  };
      19  
      20  struct E : public B {
      21    E (int);
      22  };
      23  
      24  struct A
      25    : public C1, C2, virtual public D, virtual public E
      26  {
      27    A ();
      28    B x1;
      29    B x2;
      30  };