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// ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_DISABLE_DEPRECATION_WARNINGS
10
11// type_traits
12
13// aligned_union<size_t Len, class ...Types>
14
15// Issue 3034 added:
16// The member typedef type shall be a trivial standard-layout type.
17
18#include <type_traits>
19
20#include "test_macros.h"
21
22int main(int, char**)
23{
24 {
25 typedef std::aligned_union<10, char >::type T1;
26#if TEST_STD_VER > 11
27 ASSERT_SAME_TYPE(T1, std::aligned_union_t<10, char>);
28#endif
29 static_assert(std::is_trivially_copyable<T1>::value, "");
30 static_assert(std::is_trivially_default_constructible<T1>::value, "");
31 static_assert(std::is_standard_layout<T1>::value, "");
32 static_assert(std::alignment_of<T1>::value == 1, "");
33 static_assert(sizeof(T1) == 10, "");
34 }
35 {
36 typedef std::aligned_union<10, short >::type T1;
37#if TEST_STD_VER > 11
38 ASSERT_SAME_TYPE(T1, std::aligned_union_t<10, short>);
39#endif
40 static_assert(std::is_trivially_copyable<T1>::value, "");
41 static_assert(std::is_trivially_default_constructible<T1>::value, "");
42 static_assert(std::is_standard_layout<T1>::value, "");
43 static_assert(std::alignment_of<T1>::value == 2, "");
44 static_assert(sizeof(T1) == 10, "");
45 }
46 {
47 typedef std::aligned_union<10, int >::type T1;
48#if TEST_STD_VER > 11
49 ASSERT_SAME_TYPE(T1, std::aligned_union_t<10, int>);
50#endif
51 static_assert(std::is_trivially_copyable<T1>::value, "");
52 static_assert(std::is_trivially_default_constructible<T1>::value, "");
53 static_assert(std::is_standard_layout<T1>::value, "");
54 static_assert(std::alignment_of<T1>::value == 4, "");
55 static_assert(sizeof(T1) == 12, "");
56 }
57 {
58 typedef std::aligned_union<10, double >::type T1;
59#if TEST_STD_VER > 11
60 ASSERT_SAME_TYPE(T1, std::aligned_union_t<10, double>);
61#endif
62 static_assert(std::is_trivially_copyable<T1>::value, "");
63 static_assert(std::is_trivially_default_constructible<T1>::value, "");
64 static_assert(std::is_standard_layout<T1>::value, "");
65 static_assert(std::alignment_of<T1>::value == 8, "");
66 static_assert(sizeof(T1) == 16, "");
67 }
68 {
69 typedef std::aligned_union<10, short, char >::type T1;
70#if TEST_STD_VER > 11
71 ASSERT_SAME_TYPE(T1, std::aligned_union_t<10, short, char>);
72#endif
73 static_assert(std::is_trivially_copyable<T1>::value, "");
74 static_assert(std::is_trivially_default_constructible<T1>::value, "");
75 static_assert(std::is_standard_layout<T1>::value, "");
76 static_assert(std::alignment_of<T1>::value == 2, "");
77 static_assert(sizeof(T1) == 10, "");
78 }
79 {
80 typedef std::aligned_union<10, char, short >::type T1;
81#if TEST_STD_VER > 11
82 ASSERT_SAME_TYPE(T1, std::aligned_union_t<10, char, short>);
83#endif
84 static_assert(std::is_trivially_copyable<T1>::value, "");
85 static_assert(std::is_trivially_default_constructible<T1>::value, "");
86 static_assert(std::is_standard_layout<T1>::value, "");
87 static_assert(std::alignment_of<T1>::value == 2, "");
88 static_assert(sizeof(T1) == 10, "");
89 }
90 {
91 typedef std::aligned_union<2, int, char, short >::type T1;
92#if TEST_STD_VER > 11
93 ASSERT_SAME_TYPE(T1, std::aligned_union_t<2, int, char, short>);
94#endif
95 static_assert(std::is_trivially_copyable<T1>::value, "");
96 static_assert(std::is_trivially_default_constructible<T1>::value, "");
97 static_assert(std::is_standard_layout<T1>::value, "");
98 static_assert(std::alignment_of<T1>::value == 4, "");
99 static_assert(sizeof(T1) == 4, "");
100 }
101 {
102 typedef std::aligned_union<2, char, int, short >::type T1;
103#if TEST_STD_VER > 11
104 ASSERT_SAME_TYPE(T1, std::aligned_union_t<2, char, int, short>);
105#endif
106 static_assert(std::is_trivially_copyable<T1>::value, "");
107 static_assert(std::is_trivially_default_constructible<T1>::value, "");
108 static_assert(std::is_standard_layout<T1>::value, "");
109 static_assert(std::alignment_of<T1>::value == 4, "");
110 static_assert(sizeof(T1) == 4, "");
111 }
112 {
113 typedef std::aligned_union<2, char, short, int >::type T1;
114#if TEST_STD_VER > 11
115 ASSERT_SAME_TYPE(T1, std::aligned_union_t<2, char, short, int>);
116#endif
117 static_assert(std::is_trivially_copyable<T1>::value, "");
118 static_assert(std::is_trivially_default_constructible<T1>::value, "");
119 static_assert(std::is_standard_layout<T1>::value, "");
120 static_assert(std::alignment_of<T1>::value == 4, "");
121 static_assert(sizeof(T1) == 4, "");
122 }
123
124 return 0;
125}
126

source code of libcxx/test/std/utilities/meta/meta.trans/meta.trans.other/aligned_union.pass.cpp