32     int id_;  member
33     explicit B(int id) : id_(id) {count++;}  in B()
34     B(const B& a) : id_(a.id_) {count++;}  in B()
44     int id_;  member
45     explicit C1(int id) : B(id-2), id_(id) {count++;}  in C1()
46     C1(const C1& a) : B(a.id_-2), id_(a.id_) {count++;}  in C1()
56     int id_;  member
57     explicit C2(int id) : B(id-2), id_(id) {count++;}  in C2()
58     C2(const C2& a) : B(a.id_-2), id_(a.id_) {count++;}  in C2()
68     int id_;  member
69     explicit A(int id) : C1(id-1), C2(id-2), id_(id) {count++;}  in A()
70     A(const A& a) : C1(a.id_-1), C2(a.id_-2), id_(a.id_) {count++;}  in A()
88     assert(a.id_ == 5);  in f1()
89     assert(static_cast<C1&>(a).id_ == 4);  in f1()
90     assert(static_cast<C2&>(a).id_ == 3);  in f1()
91     assert(static_cast<B&>(static_cast<C1&>(a)).id_ == 2);  in f1()
92     assert(static_cast<B&>(static_cast<C2&>(a)).id_ == 1);  in f1()
110         assert(a.id_ == 5);  in f2()
111         assert(static_cast<const C1&>(a).id_ == 4);  in f2()
112         assert(static_cast<const C2&>(a).id_ == 3);  in f2()
113         assert(static_cast<const B&>(static_cast<const C1&>(a)).id_ == 2);  in f2()
114         assert(static_cast<const B&>(static_cast<const C2&>(a)).id_ == 1);  in f2()
148         assert(c1.id_ == 4);  in f3()
149         assert(static_cast<const B&>(c1).id_ == 2);  in f3()
175         assert(c2.id_ == 3);  in f4()
176         assert(static_cast<const B&>(c2).id_ == 1);  in f4()