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 // shared_ptr<T>
17 // atomic_exchange_explicit(shared_ptr<T>* p, shared_ptr<T> r)
18 
19 // UNSUPPORTED: c++03
20 
21 #include <memory>
22 
23 #include <atomic>
24 #include <cassert>
25 
26 #include "test_macros.h"
27 
main(int,char **)28 int main(int, char**)
29 {
30     {
31         std::shared_ptr<int> p(new int(4));
32         std::shared_ptr<int> r(new int(3));
33         r = std::atomic_exchange_explicit(&p, r, std::memory_order_seq_cst);
34         assert(*p == 3);
35         assert(*r == 4);
36     }
37 
38   return 0;
39 }
40