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 // UNSUPPORTED: c++03, c++11, c++14, c++17
11
12 // template <typename T, size_t Size>
13 // constexpr auto to_array(T (&arr)[Size])
14 // -> array<remove_cv_t<T>, Size>;
15
16 // template <typename T, size_t Size>
17 // constexpr auto to_array(T (&&arr)[Size])
18 // -> array<remove_cv_t<T>, Size>;
19
20 #include <array>
21 #include <cassert>
22
23 #include "test_macros.h"
24 #include "MoveOnly.h"
25
tests()26 constexpr bool tests()
27 {
28 // Test deduced type.
29 {
30 auto arr = std::to_array({1, 2, 3});
31 ASSERT_SAME_TYPE(decltype(arr), std::array<int, 3>);
32 assert(arr[0] == 1);
33 assert(arr[1] == 2);
34 assert(arr[2] == 3);
35 }
36
37 {
38 const long l1 = 42;
39 auto arr = std::to_array({1L, 4L, 9L, l1});
40 ASSERT_SAME_TYPE(decltype(arr)::value_type, long);
41 static_assert(arr.size() == 4, "");
42 assert(arr[0] == 1);
43 assert(arr[1] == 4);
44 assert(arr[2] == 9);
45 assert(arr[3] == l1);
46 }
47
48 {
49 auto arr = std::to_array("meow");
50 ASSERT_SAME_TYPE(decltype(arr), std::array<char, 5>);
51 assert(arr[0] == 'm');
52 assert(arr[1] == 'e');
53 assert(arr[2] == 'o');
54 assert(arr[3] == 'w');
55 assert(arr[4] == '\0');
56 }
57
58 {
59 double source[3] = {4.0, 5.0, 6.0};
60 auto arr = std::to_array(source);
61 ASSERT_SAME_TYPE(decltype(arr), std::array<double, 3>);
62 assert(arr[0] == 4.0);
63 assert(arr[1] == 5.0);
64 assert(arr[2] == 6.0);
65 }
66
67 {
68 double source[3] = {4.0, 5.0, 6.0};
69 auto arr = std::to_array(std::move(source));
70 ASSERT_SAME_TYPE(decltype(arr), std::array<double, 3>);
71 assert(arr[0] == 4.0);
72 assert(arr[1] == 5.0);
73 assert(arr[2] == 6.0);
74 }
75
76 {
77 MoveOnly source[] = {MoveOnly{0}, MoveOnly{1}, MoveOnly{2}};
78
79 auto arr = std::to_array(std::move(source));
80 ASSERT_SAME_TYPE(decltype(arr), std::array<MoveOnly, 3>);
81 for (int i = 0; i < 3; ++i)
82 assert(arr[i].get() == i && source[i].get() == 0);
83 }
84
85 #ifndef _MSVC_STL_VERSION
86 // Test C99 compound literal.
87 {
88 auto arr = std::to_array((int[]){3, 4});
89 ASSERT_SAME_TYPE(decltype(arr), std::array<int, 2>);
90 assert(arr[0] == 3);
91 assert(arr[1] == 4);
92 }
93 #endif // ! _MSVC_STL_VERSION
94
95 // Test explicit type.
96 {
97 auto arr = std::to_array<long>({1, 2, 3});
98 ASSERT_SAME_TYPE(decltype(arr), std::array<long, 3>);
99 assert(arr[0] == 1);
100 assert(arr[1] == 2);
101 assert(arr[2] == 3);
102 }
103
104 {
105 struct A {
106 int a;
107 double b;
108 };
109
110 auto arr = std::to_array<A>({{3, .1}});
111 ASSERT_SAME_TYPE(decltype(arr), std::array<A, 1>);
112 assert(arr[0].a == 3);
113 assert(arr[0].b == .1);
114 }
115
116 return true;
117 }
118
main(int,char **)119 int main(int, char**)
120 {
121 tests();
122 static_assert(tests(), "");
123 return 0;
124 }
125