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

source code of libcxx/test/std/containers/sequences/array/array.data/data_const.pass.cpp