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.at(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.at(0);
41 assert(r1 == 1);
42 r1 = 5.5;
43 assert(c.front() == 5.5);
44
45 C::reference r2 = c.at(2);
46 assert(r2 == 3.5);
47 r2 = 7.5;
48 assert(c.back() == 7.5);
49
50 #ifndef TEST_HAS_NO_EXCEPTIONS
51 try
52 {
53 TEST_IGNORE_NODISCARD c.at(3);
54 assert(false);
55 }
56 catch (const std::out_of_range &) {}
57 #endif
58 }
59 #ifndef TEST_HAS_NO_EXCEPTIONS
60 {
61 typedef double T;
62 typedef std::array<T, 0> C;
63 C c = {};
64 C const& cc = c;
65 try
66 {
67 TEST_IGNORE_NODISCARD c.at(0);
68 assert(false);
69 }
70 catch (const std::out_of_range &) {}
71 try
72 {
73 TEST_IGNORE_NODISCARD cc.at(0);
74 assert(false);
75 }
76 catch (const std::out_of_range &) {}
77 }
78 #endif
79 {
80 typedef double T;
81 typedef std::array<T, 3> C;
82 const C c = {1, 2, 3.5};
83 C::const_reference r1 = c.at(0);
84 assert(r1 == 1);
85
86 C::const_reference r2 = c.at(2);
87 assert(r2 == 3.5);
88
89 #ifndef TEST_HAS_NO_EXCEPTIONS
90 try
91 {
92 TEST_IGNORE_NODISCARD c.at(3);
93 assert(false);
94 }
95 catch (const std::out_of_range &) {}
96 #endif
97 }
98
99 #if TEST_STD_VER > 11
100 {
101 typedef double T;
102 typedef std::array<T, 3> C;
103 constexpr C c = {1, 2, 3.5};
104
105 constexpr T t1 = c.at(0);
106 static_assert (t1 == 1, "");
107
108 constexpr T t2 = c.at(2);
109 static_assert (t2 == 3.5, "");
110 }
111 #endif
112
113 #if TEST_STD_VER > 14
114 {
115 static_assert (check_idx(0, 1), "");
116 static_assert (check_idx(1, 2), "");
117 static_assert (check_idx(2, 3.5), "");
118 }
119 #endif
120 }
121