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 // <atomic>
11
12 // template <class T>
13 // T
14 // atomic_exchange_explicit(volatile atomic<T>* obj, T desr, memory_order m);
15 //
16 // template <class T>
17 // T
18 // atomic_exchange_explicit(atomic<T>* obj, T desr, memory_order m);
19
20 #include <atomic>
21 #include <type_traits>
22 #include <cassert>
23
24 template <class T>
25 void
test()26 test()
27 {
28 typedef std::atomic<T> A;
29 A t;
30 std::atomic_init(&t, T(1));
31 assert(std::atomic_exchange_explicit(&t, T(2), std::memory_order_seq_cst)
32 == T(1));
33 assert(t == T(2));
34 volatile A vt;
35 std::atomic_init(&vt, T(3));
36 assert(std::atomic_exchange_explicit(&vt, T(4), std::memory_order_seq_cst)
37 == T(3));
38 assert(vt == T(4));
39 }
40
41 struct A
42 {
43 int i;
44
AA45 explicit A(int d = 0) : i(d) {}
46
operator ==(const A & x,const A & y)47 friend bool operator==(const A& x, const A& y)
48 {return x.i == y.i;}
49 };
50
main()51 int main()
52 {
53 test<A>();
54 test<char>();
55 test<signed char>();
56 test<unsigned char>();
57 test<short>();
58 test<unsigned short>();
59 test<int>();
60 test<unsigned int>();
61 test<long>();
62 test<unsigned long>();
63 test<long long>();
64 test<unsigned long long>();
65 test<wchar_t>();
66 #ifndef _LIBCPP_HAS_NO_UNICODE_CHARS
67 test<char16_t>();
68 test<char32_t>();
69 #endif // _LIBCPP_HAS_NO_UNICODE_CHARS
70 test<int*>();
71 test<const int*>();
72 }
73