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 template <typename ...T>
19 TEST_CONSTEXPR std::array<int, sizeof...(T)> tempArray(T ...args)
20 {
21     return {args...};
22 }
23 
24 TEST_CONSTEXPR_CXX14 bool tests()
25 {
26     {
27         std::array<double, 1> array = {3.3};
28         assert(std::get<0>(array) == 3.3);
29         std::get<0>(array) = 99.1;
30         assert(std::get<0>(array) == 99.1);
31     }
32     {
33         std::array<double, 2> array = {3.3, 4.4};
34         assert(std::get<0>(array) == 3.3);
35         assert(std::get<1>(array) == 4.4);
36         std::get<0>(array) = 99.1;
37         std::get<1>(array) = 99.2;
38         assert(std::get<0>(array) == 99.1);
39         assert(std::get<1>(array) == 99.2);
40     }
41     {
42         std::array<double, 3> array = {3.3, 4.4, 5.5};
43         assert(std::get<0>(array) == 3.3);
44         assert(std::get<1>(array) == 4.4);
45         assert(std::get<2>(array) == 5.5);
46         std::get<1>(array) = 99.2;
47         assert(std::get<0>(array) == 3.3);
48         assert(std::get<1>(array) == 99.2);
49         assert(std::get<2>(array) == 5.5);
50     }
51     {
52         std::array<double, 1> array = {3.3};
53         static_assert(std::is_same<double&, decltype(std::get<0>(array))>::value, "");
54     }
55     {
56         assert(std::get<0>(tempArray(1, 2, 3)) == 1);
57         assert(std::get<1>(tempArray(1, 2, 3)) == 2);
58         assert(std::get<2>(tempArray(1, 2, 3)) == 3);
59     }
60 
61     return true;
62 }
63 
64 int main(int, char**)
65 {
66     tests();
67 #if TEST_STD_VER >= 14
68     static_assert(tests(), "");
69 #endif
70     return 0;
71 }
72