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 // type_traits
11
12 // is_object
13
14 #include <type_traits>
15 #include <cstddef> // for std::nullptr_t
16 #include "test_macros.h"
17
18 template <class T>
test_is_object()19 void test_is_object()
20 {
21 static_assert( std::is_object<T>::value, "");
22 static_assert( std::is_object<const T>::value, "");
23 static_assert( std::is_object<volatile T>::value, "");
24 static_assert( std::is_object<const volatile T>::value, "");
25 #if TEST_STD_VER > 14
26 static_assert( std::is_object_v<T>, "");
27 static_assert( std::is_object_v<const T>, "");
28 static_assert( std::is_object_v<volatile T>, "");
29 static_assert( std::is_object_v<const volatile T>, "");
30 #endif
31 }
32
33 template <class T>
test_is_not_object()34 void test_is_not_object()
35 {
36 static_assert(!std::is_object<T>::value, "");
37 static_assert(!std::is_object<const T>::value, "");
38 static_assert(!std::is_object<volatile T>::value, "");
39 static_assert(!std::is_object<const volatile T>::value, "");
40 #if TEST_STD_VER > 14
41 static_assert(!std::is_object_v<T>, "");
42 static_assert(!std::is_object_v<const T>, "");
43 static_assert(!std::is_object_v<volatile T>, "");
44 static_assert(!std::is_object_v<const volatile T>, "");
45 #endif
46 }
47
48 class incomplete_type;
49
50 class Empty
51 {
52 };
53
54 class NotEmpty
55 {
56 virtual ~NotEmpty();
57 };
58
59 union Union {};
60
61 struct bit_zero
62 {
63 int : 0;
64 };
65
66 class Abstract
67 {
68 virtual ~Abstract() = 0;
69 };
70
71 enum Enum {zero, one};
72
73 typedef void (*FunctionPtr)();
74
75
main()76 int main()
77 {
78 // An object type is a (possibly cv-qualified) type that is not a function type,
79 // not a reference type, and not a void type.
80
81 test_is_object<std::nullptr_t>();
82 test_is_object<void *>();
83 test_is_object<char[3]>();
84 test_is_object<char[]>();
85 test_is_object<int>();
86 test_is_object<int*>();
87 test_is_object<Union>();
88 test_is_object<int*>();
89 test_is_object<const int*>();
90 test_is_object<Enum>();
91 test_is_object<incomplete_type>();
92 test_is_object<bit_zero>();
93 test_is_object<NotEmpty>();
94 test_is_object<Abstract>();
95 test_is_object<FunctionPtr>();
96 test_is_object<int Empty::*>();
97 test_is_object<void (Empty::*)(int)>();
98
99 test_is_not_object<void>();
100 test_is_not_object<int&>();
101 test_is_not_object<int&&>();
102 test_is_not_object<int(int)>();
103 }
104