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 // template <size_t I, class T, size_t N> T& get(array<T, N>& a);
12 
13 #include <array>
14 #include <cassert>
15 
16 #include "test_macros.h"
17 
18 // std::array is explicitly allowed to be initialized with A a = { init-list };.
19 // Disable the missing braces warning for this reason.
20 #include "disable_missing_braces_warning.h"
21 
22 
23 template <typename ...T>
24 TEST_CONSTEXPR std::array<int, sizeof...(T)> tempArray(T ...args)
25 {
26     return {args...};
27 }
28 
29 TEST_CONSTEXPR_CXX14 bool tests()
30 {
31     {
32         std::array<double, 1> array = {3.3};
33         assert(std::get<0>(array) == 3.3);
34         std::get<0>(array) = 99.1;
35         assert(std::get<0>(array) == 99.1);
36     }
37     {
38         std::array<double, 2> array = {3.3, 4.4};
39         assert(std::get<0>(array) == 3.3);
40         assert(std::get<1>(array) == 4.4);
41         std::get<0>(array) = 99.1;
42         std::get<1>(array) = 99.2;
43         assert(std::get<0>(array) == 99.1);
44         assert(std::get<1>(array) == 99.2);
45     }
46     {
47         std::array<double, 3> array = {3.3, 4.4, 5.5};
48         assert(std::get<0>(array) == 3.3);
49         assert(std::get<1>(array) == 4.4);
50         assert(std::get<2>(array) == 5.5);
51         std::get<1>(array) = 99.2;
52         assert(std::get<0>(array) == 3.3);
53         assert(std::get<1>(array) == 99.2);
54         assert(std::get<2>(array) == 5.5);
55     }
56     {
57         std::array<double, 1> array = {3.3};
58         static_assert(std::is_same<double&, decltype(std::get<0>(array))>::value, "");
59     }
60     {
61         assert(std::get<0>(tempArray(1, 2, 3)) == 1);
62         assert(std::get<1>(tempArray(1, 2, 3)) == 2);
63         assert(std::get<2>(tempArray(1, 2, 3)) == 3);
64     }
65 
66     return true;
67 }
68 
69 int main(int, char**)
70 {
71     tests();
72 #if TEST_STD_VER >= 14
73     static_assert(tests(), "");
74 #endif
75     return 0;
76 }
77