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 // type_traits
10
11 // is_object
12
13 #include <type_traits>
14 #include <cstddef> // for std::nullptr_t
15 #include "test_macros.h"
16
17 template <class T>
test_is_object()18 void test_is_object()
19 {
20 static_assert( std::is_object<T>::value, "");
21 static_assert( std::is_object<const T>::value, "");
22 static_assert( std::is_object<volatile T>::value, "");
23 static_assert( std::is_object<const volatile T>::value, "");
24 #if TEST_STD_VER > 14
25 static_assert( std::is_object_v<T>, "");
26 static_assert( std::is_object_v<const T>, "");
27 static_assert( std::is_object_v<volatile T>, "");
28 static_assert( std::is_object_v<const volatile T>, "");
29 #endif
30 }
31
32 template <class T>
test_is_not_object()33 void test_is_not_object()
34 {
35 static_assert(!std::is_object<T>::value, "");
36 static_assert(!std::is_object<const T>::value, "");
37 static_assert(!std::is_object<volatile T>::value, "");
38 static_assert(!std::is_object<const volatile T>::value, "");
39 #if TEST_STD_VER > 14
40 static_assert(!std::is_object_v<T>, "");
41 static_assert(!std::is_object_v<const T>, "");
42 static_assert(!std::is_object_v<volatile T>, "");
43 static_assert(!std::is_object_v<const volatile T>, "");
44 #endif
45 }
46
47 class incomplete_type;
48
49 class Empty
50 {
51 };
52
53 class NotEmpty
54 {
55 virtual ~NotEmpty();
56 };
57
58 union Union {};
59
60 struct bit_zero
61 {
62 int : 0;
63 };
64
65 class Abstract
66 {
67 virtual ~Abstract() = 0;
68 };
69
70 enum Enum {zero, one};
71
72 typedef void (*FunctionPtr)();
73
74
main(int,char **)75 int main(int, char**)
76 {
77 // An object type is a (possibly cv-qualified) type that is not a function type,
78 // not a reference type, and not a void type.
79
80 test_is_object<std::nullptr_t>();
81 test_is_object<void *>();
82 test_is_object<char[3]>();
83 test_is_object<char[]>();
84 test_is_object<int>();
85 test_is_object<int*>();
86 test_is_object<Union>();
87 test_is_object<int*>();
88 test_is_object<const int*>();
89 test_is_object<Enum>();
90 test_is_object<incomplete_type>();
91 test_is_object<bit_zero>();
92 test_is_object<NotEmpty>();
93 test_is_object<Abstract>();
94 test_is_object<FunctionPtr>();
95 test_is_object<int Empty::*>();
96 test_is_object<void (Empty::*)(int)>();
97
98 test_is_not_object<void>();
99 test_is_not_object<int&>();
100 test_is_not_object<int&&>();
101 test_is_not_object<int(int)>();
102
103 return 0;
104 }
105