49 struct C2  struct
54     explicit C2(int id) : B(id-2), id_(id) {count++;}  in C2()  function
55     C2(const C2& a) : B(a.id_-2), id_(a.id_) {count++;}  in C2()  function
56     ~C2() {count--;}  in ~C2()  argument
59 int C2::count = 0;
62     : C1, C2
66     explicit A(int id) : C1(id-1), C2(id-2), id_(id) {count++;}  in A()
67     A(const A& a) : C1(a.id_-1), C2(a.id_-2), id_(a.id_) {count++;}  in A()
77     assert(C2::count == 0);  in f1()
82     assert(C2::count == 1);  in f1()
87     assert(static_cast<C2&>(a).id_ == 3);  in f1()
89     assert(static_cast<B&>(static_cast<C2&>(a)).id_ == 1);  in f1()
100         assert(C2::count == 0);  in f2()
109         assert(static_cast<const C2&>(a).id_ == 3);  in f2()
111         assert(static_cast<const B&>(static_cast<const C2&>(a)).id_ == 1);  in f2()
118     catch (const C2&)  in f2()
134         assert(C2::count == 0);  in f3()
149     catch (const C2&)  in f3()
161         assert(C2::count == 0);  in f4()
170     catch (const C2& c2)  // can catch C2  in f4()
194     assert(C2::count == 0);  in main()