atomic_compare_exchange_weak_explicit.pass.cpp revision cedb7fcc10556aaf4302917913c672b1bc6a1db0 
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// This test uses new symbols that were not defined in the libc++ shipped on
11// darwin11 and darwin12:
12// XFAIL: with_system_lib=x86_64-apple-darwin11
13// XFAIL: with_system_lib=x86_64-apple-darwin12
14
15// <memory>
16
17// shared_ptr
18
19// template <class T>
20// bool
21// atomic_compare_exchange_weak_explicit(shared_ptr<T>* p, shared_ptr<T>* v,
22//                                       shared_ptr<T> w, memory_order success,
23//                                       memory_order failure);
24
25#include <memory>
26#include <cassert>
27
28int main()
29{
30#if __has_feature(cxx_atomic)
31    {
32        std::shared_ptr<int> p(new int(4));
33        std::shared_ptr<int> v(new int(3));
34        std::shared_ptr<int> w(new int(2));
35        bool b = std::atomic_compare_exchange_weak_explicit(&p, &v, w,
36                                                            std::memory_order_seq_cst,
37                                                            std::memory_order_seq_cst);
38        assert(b == false);
39        assert(*p == 4);
40        assert(*v == 4);
41        assert(*w == 2);
42    }
43    {
44        std::shared_ptr<int> p(new int(4));
45        std::shared_ptr<int> v = p;
46        std::shared_ptr<int> w(new int(2));
47        bool b = std::atomic_compare_exchange_weak_explicit(&p, &v, w,
48                                                            std::memory_order_seq_cst,
49                                                            std::memory_order_seq_cst);
50        assert(b == true);
51        assert(*p == 2);
52        assert(*v == 4);
53        assert(*w == 2);
54    }
55#endif
56}
57