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 struct NonSwappable {
20     TEST_CONSTEXPR NonSwappable() { }
21 private:
22     NonSwappable(NonSwappable const&);
23     NonSwappable& operator=(NonSwappable const&);
24 };
25 
26 TEST_CONSTEXPR_CXX20 bool tests()
27 {
28     {
29         typedef double T;
30         typedef std::array<T, 3> C;
31         C c1 = {1, 2, 3.5};
32         C c2 = {4, 5, 6.5};
33         c1.swap(c2);
34         assert(c1.size() == 3);
35         assert(c1[0] == 4);
36         assert(c1[1] == 5);
37         assert(c1[2] == 6.5);
38         assert(c2.size() == 3);
39         assert(c2[0] == 1);
40         assert(c2[1] == 2);
41         assert(c2[2] == 3.5);
42     }
43     {
44         typedef double T;
45         typedef std::array<T, 3> C;
46         C c1 = {1, 2, 3.5};
47         C c2 = {4, 5, 6.5};
48         std::swap(c1, c2);
49         assert(c1.size() == 3);
50         assert(c1[0] == 4);
51         assert(c1[1] == 5);
52         assert(c1[2] == 6.5);
53         assert(c2.size() == 3);
54         assert(c2[0] == 1);
55         assert(c2[1] == 2);
56         assert(c2[2] == 3.5);
57     }
58 
59     {
60         typedef double T;
61         typedef std::array<T, 0> C;
62         C c1 = {};
63         C c2 = {};
64         c1.swap(c2);
65         assert(c1.size() == 0);
66         assert(c2.size() == 0);
67     }
68     {
69         typedef double T;
70         typedef std::array<T, 0> C;
71         C c1 = {};
72         C c2 = {};
73         std::swap(c1, c2);
74         assert(c1.size() == 0);
75         assert(c2.size() == 0);
76     }
77     {
78         typedef NonSwappable T;
79         typedef std::array<T, 0> C0;
80         C0 l = {};
81         C0 r = {};
82         l.swap(r);
83 #if TEST_STD_VER >= 11
84         static_assert(noexcept(l.swap(r)), "");
85 #endif
86     }
87 
88     return true;
89 }
90 
91 int main(int, char**)
92 {
93     tests();
94 #if TEST_STD_VER >= 20
95     static_assert(tests(), "");
96 #endif
97   return 0;
98 }
99