1 //===----------------------------------------------------------------------===//
2 //
3 //                     The LLVM Compiler Infrastructure
4 //
5 // This file is dual licensed under the MIT and the University of Illinois Open
6 // Source Licenses. See LICENSE.TXT for details.
7 //
8 //===----------------------------------------------------------------------===//
9 
10 #ifndef AB_H
11 #define AB_H
12 
13 #include <cassert>
14 
15 class A
16 {
17     int id_;
18 public:
A(int id)19     explicit A(int id) : id_(id) {++count;}
A(const A & a)20     A(const A& a) : id_(a.id_) {++count;}
~A()21     virtual ~A() {assert(id_ >= 0); id_ = -1; --count;}
22 
23     static int count;
24 };
25 
26 int A::count = 0;
27 
28 class B
29     : public A
30 {
31 public:
B(int id)32     explicit B(int id) : A(id) {++count;}
B(const B & a)33     B(const B& a) : A(a) {++count;}
~B()34     virtual ~B() {--count;}
35 
36     static int count;
37 };
38 
39 int B::count = 0;
40 
41 #endif  // AB_H
42