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 // UNSUPPORTED: no-threads
10 
11 // <memory>
12 
13 // shared_ptr
14 
15 // template <class T>
16 // bool
17 // atomic_compare_exchange_weak(shared_ptr<T>* p, shared_ptr<T>* v,
18 //                              shared_ptr<T> w);
19 
20 // UNSUPPORTED: c++03
21 
22 #include <memory>
23 #include <cassert>
24 
25 #include "test_macros.h"
26 
main(int,char **)27 int main(int, char**)
28 {
29     {
30         std::shared_ptr<int> p(new int(4));
31         std::shared_ptr<int> v(new int(3));
32         std::shared_ptr<int> w(new int(2));
33         bool b = std::atomic_compare_exchange_weak(&p, &v, w);
34         assert(b == false);
35         assert(*p == 4);
36         assert(*v == 4);
37         assert(*w == 2);
38     }
39     {
40         std::shared_ptr<int> p(new int(4));
41         std::shared_ptr<int> v = p;
42         std::shared_ptr<int> w(new int(2));
43         bool b = std::atomic_compare_exchange_weak(&p, &v, w);
44         assert(b == true);
45         assert(*p == 2);
46         assert(*v == 4);
47         assert(*w == 2);
48     }
49 
50   return 0;
51 }
52