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 // <array>
11
12 // void swap(array& a);
13 // namespace std { void swap(array<T, N> &x, array<T, N> &y);
14
15 #include <cassert>
16 #include <array>
17
18 #include "test_macros.h"
19
20 // std::array is explicitly allowed to be initialized with A a = { init-list };.
21 // Disable the missing braces warning for this reason.
22 #include "disable_missing_braces_warning.h"
23
24 struct NonSwappable {
NonSwappableNonSwappable25 NonSwappable() {}
26 private:
27 NonSwappable(NonSwappable const&);
28 NonSwappable& operator=(NonSwappable const&);
29 };
30
main()31 int main()
32 {
33 {
34 typedef double T;
35 typedef std::array<T, 3> C;
36 C c1 = {1, 2, 3.5};
37 C c2 = {4, 5, 6.5};
38 c1.swap(c2);
39 assert(c1.size() == 3);
40 assert(c1[0] == 4);
41 assert(c1[1] == 5);
42 assert(c1[2] == 6.5);
43 assert(c2.size() == 3);
44 assert(c2[0] == 1);
45 assert(c2[1] == 2);
46 assert(c2[2] == 3.5);
47 }
48 {
49 typedef double T;
50 typedef std::array<T, 3> C;
51 C c1 = {1, 2, 3.5};
52 C c2 = {4, 5, 6.5};
53 std::swap(c1, c2);
54 assert(c1.size() == 3);
55 assert(c1[0] == 4);
56 assert(c1[1] == 5);
57 assert(c1[2] == 6.5);
58 assert(c2.size() == 3);
59 assert(c2[0] == 1);
60 assert(c2[1] == 2);
61 assert(c2[2] == 3.5);
62 }
63
64 {
65 typedef double T;
66 typedef std::array<T, 0> C;
67 C c1 = {};
68 C c2 = {};
69 c1.swap(c2);
70 assert(c1.size() == 0);
71 assert(c2.size() == 0);
72 }
73 {
74 typedef double T;
75 typedef std::array<T, 0> C;
76 C c1 = {};
77 C c2 = {};
78 std::swap(c1, c2);
79 assert(c1.size() == 0);
80 assert(c2.size() == 0);
81 }
82 {
83 typedef NonSwappable T;
84 typedef std::array<T, 0> C0;
85 C0 l = {};
86 C0 r = {};
87 l.swap(r);
88 #if TEST_STD_VER >= 11
89 static_assert(noexcept(l.swap(r)), "");
90 #endif
91 }
92
93 }
94