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_explicit(shared_ptr<T>* p, shared_ptr<T>* v,
18// shared_ptr<T> w, memory_order success,
19// memory_order failure);
20
21// UNSUPPORTED: c++03
22
23#include <memory>
24
25#include <atomic>
26#include <cassert>
27
28#include "test_macros.h"
29
30int main(int, char**)
31{
32 {
33 std::shared_ptr<int> p(new int(4));
34 std::shared_ptr<int> v(new int(3));
35 std::shared_ptr<int> w(new int(2));
36 bool b = std::atomic_compare_exchange_weak_explicit(&p, &v, w,
37 std::memory_order_seq_cst,
38 std::memory_order_seq_cst);
39 assert(b == false);
40 assert(*p == 4);
41 assert(*v == 4);
42 assert(*w == 2);
43 }
44 {
45 std::shared_ptr<int> p(new int(4));
46 std::shared_ptr<int> v = p;
47 std::shared_ptr<int> w(new int(2));
48 bool b = std::atomic_compare_exchange_weak_explicit(&p, &v, w,
49 std::memory_order_seq_cst,
50 std::memory_order_seq_cst);
51 assert(b == true);
52 assert(*p == 2);
53 assert(*v == 4);
54 assert(*w == 2);
55 }
56
57 return 0;
58}
59

source code of libcxx/test/std/utilities/memory/util.smartptr/util.smartptr.shared.atomic/atomic_compare_exchange_weak_explicit.pass.cpp