23     int id_;  member
24     explicit B(int id) : id_(id) {count++;}  in B()
25     B(const B& a) : id_(a.id_) {count++;}  in B()
35     int id_;  member
36     explicit C1(int id) : B(id-2), id_(id) {count++;}  in C1()
37     C1(const C1& a) : B(a.id_-2), id_(a.id_) {count++;}  in C1()
47     int id_;  member
48     explicit C2(int id) : B(id-2), id_(id) {count++;}  in C2()
49     C2(const C2& a) : B(a.id_-2), id_(a.id_) {count++;}  in C2()
59     int id_;  member
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()
84         assert(a->id_ == 5);  in f2()
85         assert(static_cast<const C1*>(a)->id_ == 4);  in f2()
86         assert(static_cast<const C2*>(a)->id_ == 3);  in f2()
87         assert(static_cast<const B*>(a)->id_ == 8);  in f2()
113         assert(static_cast<const B*>(a)->id_ == 8);  in f3()
135         assert(c2->id_ == 3);  in f4()
157         assert(c1->id_ == 4);  in f5()
158         assert(static_cast<const B*>(c1)->id_ == 8);  in f5()