43 struct C2  struct
48     explicit C2(int id) : B(id-2), id_(id) {count++;}  in C2()  argument
49     C2(const C2& a) : B(a.id_-2), id_(a.id_) {count++;}  in C2()  argument
50     ~C2() {count--;}  in ~C2()  argument
53 int C2::count = 0;
56     : C1, C2
60     explicit A(int id) : C1(id-1), C2(id-2), B(id+3), id_(id) {count++;}  in A()
61     A(const A& a) : C1(a.id_-1), C2(a.id_-2), B(a.id_+3), id_(a.id_) {count++;}  in A()
71     assert(C2::count == 0);  in f1()
76     assert(C2::count == 1);  in f1()
81     assert(static_cast<C2&>(a).id_ == 3);  in f1()
93         assert(C2::count == 0);  in f2()
102         assert(static_cast<const C2&>(a).id_ == 3);  in f2()
110     catch (const C2&)  in f2()
126         assert(C2::count == 0);  in f3()
140     catch (const C2&)  in f3()
152         assert(C2::count == 0);  in f4()
157     catch (const C2& c2)  // can catch C2  in f4()
178         assert(C2::count == 0);  in f5()
193     catch (const C2&)  in f5()
211     assert(C2::count == 0);  in main()