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 // const T* data() const;
12
13 #include <array>
14 #include <cassert>
15 #include <cstddef> // for std::max_align_t
16
17 #include "test_macros.h"
18
19 // std::array is explicitly allowed to be initialized with A a = { init-list };.
20 // Disable the missing braces warning for this reason.
21 #include "disable_missing_braces_warning.h"
22
23 struct NoDefault {
NoDefaultNoDefault24 TEST_CONSTEXPR NoDefault(int) { }
25 };
26
27 #if TEST_STD_VER < 11
28 struct natural_alignment {
29 long t1;
30 long long t2;
31 double t3;
32 long double t4;
33 };
34 #endif
35
tests()36 TEST_CONSTEXPR_CXX17 bool tests()
37 {
38 {
39 typedef double T;
40 typedef std::array<T, 3> C;
41 const C c = {1, 2, 3.5};
42 const T* p = c.data();
43 assert(p[0] == 1);
44 assert(p[1] == 2);
45 assert(p[2] == 3.5);
46 }
47 {
48 typedef double T;
49 typedef std::array<T, 0> C;
50 const C c = {};
51 const T* p = c.data();
52 (void)p;
53 }
54 {
55 typedef NoDefault T;
56 typedef std::array<T, 0> C;
57 const C c = {};
58 const T* p = c.data();
59 (void)p;
60 }
61 {
62 std::array<int, 5> const c = {0, 1, 2, 3, 4};
63 assert(c.data() == &c[0]);
64 assert(*c.data() == c[0]);
65 }
66
67 return true;
68 }
69
main(int,char **)70 int main(int, char**)
71 {
72 tests();
73 #if TEST_STD_VER >= 17
74 static_assert(tests(), "");
75 #endif
76
77 // Test the alignment of data()
78 {
79 #if TEST_STD_VER < 11
80 typedef natural_alignment T;
81 #else
82 typedef std::max_align_t T;
83 #endif
84 typedef std::array<T, 0> C;
85 const C c = {};
86 const T* p = c.data();
87 std::uintptr_t pint = reinterpret_cast<std::uintptr_t>(p);
88 assert(pint % TEST_ALIGNOF(T) == 0);
89 }
90
91 return 0;
92 }
93