1 //===----------------------------------------------------------------------===//
2 //
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6 //
7 //===----------------------------------------------------------------------===//
8 
9 // <memory>
10 
11 // shared_ptr
12 
13 // shared_ptr(const shared_ptr& r);
14 
15 #include <memory>
16 #include <cassert>
17 
18 #include "test_macros.h"
19 
20 struct A
21 {
22     static int count;
23 
AA24     A() {++count;}
AA25     A(const A&) {++count;}
~AA26     ~A() {--count;}
27 };
28 
29 int A::count = 0;
30 
main(int,char **)31 int main(int, char**)
32 {
33     {
34         std::shared_ptr<A> pA(new A);
35         assert(pA.use_count() == 1);
36         assert(A::count == 1);
37         {
38             std::shared_ptr<A> pA2(pA);
39             assert(A::count == 1);
40             assert(pA.use_count() == 2);
41             assert(pA2.use_count() == 2);
42             assert(pA2.get() == pA.get());
43         }
44         assert(pA.use_count() == 1);
45         assert(A::count == 1);
46     }
47     assert(A::count == 0);
48     {
49         std::shared_ptr<A> pA;
50         assert(pA.use_count() == 0);
51         assert(A::count == 0);
52         {
53             std::shared_ptr<A> pA2(pA);
54             assert(A::count == 0);
55             assert(pA.use_count() == 0);
56             assert(pA2.use_count() == 0);
57             assert(pA2.get() == pA.get());
58         }
59         assert(pA.use_count() == 0);
60         assert(A::count == 0);
61     }
62     assert(A::count == 0);
63 
64     {
65         std::shared_ptr<A const> pA(new A);
66         std::shared_ptr<A const> pA2(pA);
67         assert(pA.get() == pA2.get());
68     }
69 
70   return 0;
71 }
72