29     int id_;  member
30     explicit B(int id) : id_(id) {count++;}  in B()
31     B(const B& a) : id_(a.id_) {count++;}  in B()
41     int id_;  member
42     explicit C1(int id) : B(id-2), id_(id) {count++;}  in C1()
43     C1(const C1& a) : B(a.id_-2), id_(a.id_) {count++;}  in C1()
53     int id_;  member
54     explicit C2(int id) : B(id-2), id_(id) {count++;}  in C2()
55     C2(const C2& a) : B(a.id_-2), id_(a.id_) {count++;}  in C2()
65     int id_;  member
66     explicit A(int id) : B(id+3), C1(id-1), C2(id-2), id_(id) {count++;}  in A()
67     A(const A& a) : B(a.id_+3), C1(a.id_-1), C2(a.id_-2),  id_(a.id_) {count++;}  in A()
90         assert(a->id_ == 5);  in f2()
91         assert(static_cast<const C1*>(a)->id_ == 4);  in f2()
92         assert(static_cast<const C2*>(a)->id_ == 3);  in f2()
93         assert(static_cast<const B*>(a)->id_ == 8);  in f2()
119         assert(static_cast<const B*>(a)->id_ == 8);  in f3()
141         assert(c2->id_ == 3);  in f4()
163         assert(c1->id_ == 4);  in f5()
164         assert(static_cast<const B*>(c1)->id_ == 8);  in f5()