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 // <memory>
11 
12 // shared_ptr
13 
14 // template<class Y> void reset(Y* p);
15 
16 #include <memory>
17 #include <cassert>
18 
19 struct B
20 {
21     static int count;
22 
BB23     B() {++count;}
BB24     B(const B&) {++count;}
~BB25     virtual ~B() {--count;}
26 };
27 
28 int B::count = 0;
29 
30 struct A
31     : public B
32 {
33     static int count;
34 
AA35     A() {++count;}
AA36     A(const A&) {++count;}
~AA37     ~A() {--count;}
38 };
39 
40 int A::count = 0;
41 
main()42 int main()
43 {
44     {
45         std::shared_ptr<B> p(new B);
46         A* ptr = new A;
47         p.reset(ptr);
48         assert(A::count == 1);
49         assert(B::count == 1);
50         assert(p.use_count() == 1);
51         assert(p.get() == ptr);
52     }
53     assert(A::count == 0);
54     {
55         std::shared_ptr<B> p;
56         A* ptr = new A;
57         p.reset(ptr);
58         assert(A::count == 1);
59         assert(B::count == 1);
60         assert(p.use_count() == 1);
61         assert(p.get() == ptr);
62     }
63     assert(A::count == 0);
64 }
65