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
19struct NonSwappable {
20 TEST_CONSTEXPR NonSwappable() {}
21
22private:
23 NonSwappable(NonSwappable const&);
24 NonSwappable& operator=(NonSwappable const&);
25};
26
27TEST_CONSTEXPR_CXX20 bool tests() {
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(other&: 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(one&: c1, two&: 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(other&: 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(one&: c1, two&: 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(other&: r);
83#if TEST_STD_VER >= 11
84 static_assert(noexcept(l.swap(r)), "");
85#endif
86 }
87
88 return true;
89}
90
91int main(int, char**) {
92 tests();
93#if TEST_STD_VER >= 20
94 static_assert(tests(), "");
95#endif
96 return 0;
97}
98

source code of libcxx/test/std/containers/sequences/array/array.swap/swap.pass.cpp