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 // <array>
10
11 // void swap(array& a);
12 // namespace std { void swap(array<T, N> &x, array<T, N> &y);
13
14 #include <cassert>
15 #include <array>
16
17 #include "test_macros.h"
18
19 // std::array is explicitly allowed to be initialized with A a = { init-list };.
20 // Disable the missing braces warning for this reason.
21 #include "disable_missing_braces_warning.h"
22
23 struct NonSwappable {
NonSwappableNonSwappable24 NonSwappable() {}
25 private:
26 NonSwappable(NonSwappable const&);
27 NonSwappable& operator=(NonSwappable const&);
28 };
29
main(int,char **)30 int main(int, char**)
31 {
32 {
33 typedef double T;
34 typedef std::array<T, 3> C;
35 C c1 = {1, 2, 3.5};
36 C c2 = {4, 5, 6.5};
37 c1.swap(c2);
38 assert(c1.size() == 3);
39 assert(c1[0] == 4);
40 assert(c1[1] == 5);
41 assert(c1[2] == 6.5);
42 assert(c2.size() == 3);
43 assert(c2[0] == 1);
44 assert(c2[1] == 2);
45 assert(c2[2] == 3.5);
46 }
47 {
48 typedef double T;
49 typedef std::array<T, 3> C;
50 C c1 = {1, 2, 3.5};
51 C c2 = {4, 5, 6.5};
52 std::swap(c1, c2);
53 assert(c1.size() == 3);
54 assert(c1[0] == 4);
55 assert(c1[1] == 5);
56 assert(c1[2] == 6.5);
57 assert(c2.size() == 3);
58 assert(c2[0] == 1);
59 assert(c2[1] == 2);
60 assert(c2[2] == 3.5);
61 }
62
63 {
64 typedef double T;
65 typedef std::array<T, 0> C;
66 C c1 = {};
67 C c2 = {};
68 c1.swap(c2);
69 assert(c1.size() == 0);
70 assert(c2.size() == 0);
71 }
72 {
73 typedef double T;
74 typedef std::array<T, 0> C;
75 C c1 = {};
76 C c2 = {};
77 std::swap(c1, c2);
78 assert(c1.size() == 0);
79 assert(c2.size() == 0);
80 }
81 {
82 typedef NonSwappable T;
83 typedef std::array<T, 0> C0;
84 C0 l = {};
85 C0 r = {};
86 l.swap(r);
87 #if TEST_STD_VER >= 11
88 static_assert(noexcept(l.swap(r)), "");
89 #endif
90 }
91
92
93 return 0;
94 }
95