1 //===----------------------------------------------------------------------===//
2 //
3 // The LLVM Compiler Infrastructure
4 //
5 // This file is dual licensed under the MIT and the University of Illinois Open
6 // Source Licenses. See LICENSE.TXT for details.
7 //
8 //===----------------------------------------------------------------------===//
9
10 // <array>
11
12 // reference operator[] (size_type)
13 // const_reference operator[] (size_type); // constexpr in C++14
14 // reference at (size_type)
15 // const_reference at (size_type); // constexpr in C++14
16
17 #include <array>
18 #include <cassert>
19
20 #include "test_macros.h"
21
22 // std::array is explicitly allowed to be initialized with A a = { init-list };.
23 // Disable the missing braces warning for this reason.
24 #include "disable_missing_braces_warning.h"
25
26 #if TEST_STD_VER > 14
check_idx(size_t idx,double val)27 constexpr bool check_idx( size_t idx, double val )
28 {
29 std::array<double, 3> arr = {1, 2, 3.5};
30 return arr[idx] == val;
31 }
32 #endif
33
main()34 int main()
35 {
36 {
37 typedef double T;
38 typedef std::array<T, 3> C;
39 C c = {1, 2, 3.5};
40 C::reference r1 = c[0];
41 assert(r1 == 1);
42 r1 = 5.5;
43 assert(c.front() == 5.5);
44
45 C::reference r2 = c[2];
46 assert(r2 == 3.5);
47 r2 = 7.5;
48 assert(c.back() == 7.5);
49 }
50 {
51 typedef double T;
52 typedef std::array<T, 3> C;
53 const C c = {1, 2, 3.5};
54 C::const_reference r1 = c[0];
55 assert(r1 == 1);
56 C::const_reference r2 = c[2];
57 assert(r2 == 3.5);
58 }
59
60 #if TEST_STD_VER > 11
61 {
62 typedef double T;
63 typedef std::array<T, 3> C;
64 constexpr C c = {1, 2, 3.5};
65
66 constexpr T t1 = c[0];
67 static_assert (t1 == 1, "");
68
69 constexpr T t2 = c[2];
70 static_assert (t2 == 3.5, "");
71 }
72 #endif
73
74 #if TEST_STD_VER > 14
75 {
76 static_assert (check_idx(0, 1), "");
77 static_assert (check_idx(1, 2), "");
78 static_assert (check_idx(2, 3.5), "");
79 }
80 #endif
81 }
82