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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 // T *data();
13 
14 #include <array>
15 #include <cassert>
16 #include "test_macros.h"
17 
18 // std::array is explicitly allowed to be initialized with A a = { init-list };.
19 // Disable the missing braces warning for this reason.
20 #include "disable_missing_braces_warning.h"
21 
main()22 int main()
23 {
24     {
25         typedef double T;
26         typedef std::array<T, 3> C;
27         C c = {1, 2, 3.5};
28         T* p = c.data();
29         assert(p[0] == 1);
30         assert(p[1] == 2);
31         assert(p[2] == 3.5);
32     }
33     {
34         typedef double T;
35         typedef std::array<T, 0> C;
36         C c = {};
37         T* p = c.data();
38         assert(p != nullptr);
39     }
40     {
41       typedef double T;
42       typedef std::array<const T, 0> C;
43       C c = {{}};
44       const T* p = c.data();
45       static_assert((std::is_same<decltype(c.data()), const T*>::value), "");
46       assert(p != nullptr);
47     }
48   {
49       typedef std::max_align_t T;
50       typedef std::array<T, 0> C;
51       const C c = {};
52       const T* p = c.data();
53       assert(p != nullptr);
54       std::uintptr_t pint = reinterpret_cast<std::uintptr_t>(p);
55       assert(pint % TEST_ALIGNOF(std::max_align_t) == 0);
56     }
57     {
58       struct NoDefault {
59         NoDefault(int) {}
60       };
61       typedef NoDefault T;
62       typedef std::array<T, 0> C;
63       C c = {};
64       T* p = c.data();
65       assert(p != nullptr);
66     }
67 }
68