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 // UNSUPPORTED: c++03, c++11, c++14
10 // UNSUPPORTED: clang-4, clang-5, apple-clang, gcc-5, gcc-6
11
12 // type_traits
13
14 // has_unique_object_representations
15
16 #include <type_traits>
17
18 #include "test_macros.h"
19
20 template <class T>
test_has_unique_object_representations()21 void test_has_unique_object_representations()
22 {
23 static_assert( std::has_unique_object_representations<T>::value, "");
24 static_assert( std::has_unique_object_representations<const T>::value, "");
25 static_assert( std::has_unique_object_representations<volatile T>::value, "");
26 static_assert( std::has_unique_object_representations<const volatile T>::value, "");
27
28 static_assert( std::has_unique_object_representations_v<T>, "");
29 static_assert( std::has_unique_object_representations_v<const T>, "");
30 static_assert( std::has_unique_object_representations_v<volatile T>, "");
31 static_assert( std::has_unique_object_representations_v<const volatile T>, "");
32 }
33
34 template <class T>
test_has_not_has_unique_object_representations()35 void test_has_not_has_unique_object_representations()
36 {
37 static_assert(!std::has_unique_object_representations<T>::value, "");
38 static_assert(!std::has_unique_object_representations<const T>::value, "");
39 static_assert(!std::has_unique_object_representations<volatile T>::value, "");
40 static_assert(!std::has_unique_object_representations<const volatile T>::value, "");
41
42 static_assert(!std::has_unique_object_representations_v<T>, "");
43 static_assert(!std::has_unique_object_representations_v<const T>, "");
44 static_assert(!std::has_unique_object_representations_v<volatile T>, "");
45 static_assert(!std::has_unique_object_representations_v<const volatile T>, "");
46 }
47
48 class Empty
49 {
50 };
51
52 class NotEmpty
53 {
54 virtual ~NotEmpty();
55 };
56
57 union EmptyUnion {};
58 struct NonEmptyUnion {int x; unsigned y;};
59
60 struct bit_zero
61 {
62 int : 0;
63 };
64
65 class Abstract
66 {
67 virtual ~Abstract() = 0;
68 };
69
70 struct A
71 {
72 ~A();
73 unsigned foo;
74 };
75
76 struct B
77 {
78 char bar;
79 int foo;
80 };
81
82
main(int,char **)83 int main(int, char**)
84 {
85 test_has_not_has_unique_object_representations<void>();
86 test_has_not_has_unique_object_representations<Empty>();
87 test_has_not_has_unique_object_representations<EmptyUnion>();
88 test_has_not_has_unique_object_representations<NotEmpty>();
89 test_has_not_has_unique_object_representations<bit_zero>();
90 test_has_not_has_unique_object_representations<Abstract>();
91 test_has_not_has_unique_object_representations<B>();
92
93 // I would expect all three of these to have unique representations.
94 // I would also expect that there are systems where they do not.
95 // test_has_not_has_unique_object_representations<int&>();
96 // test_has_not_has_unique_object_representations<int *>();
97 // test_has_not_has_unique_object_representations<double>();
98
99
100 test_has_unique_object_representations<unsigned>();
101 test_has_unique_object_representations<NonEmptyUnion>();
102 test_has_unique_object_representations<char[3]>();
103 test_has_unique_object_representations<char[]>();
104
105
106 return 0;
107 }
108