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_class
13
14#include <type_traits>
15#include <cstddef>        // for std::nullptr_t
16#include "test_macros.h"
17
18template <class T>
19void test_is_class()
20{
21    static_assert( std::is_class<T>::value, "");
22    static_assert( std::is_class<const T>::value, "");
23    static_assert( std::is_class<volatile T>::value, "");
24    static_assert( std::is_class<const volatile T>::value, "");
25#if TEST_STD_VER > 14
26    static_assert( std::is_class_v<T>, "");
27    static_assert( std::is_class_v<const T>, "");
28    static_assert( std::is_class_v<volatile T>, "");
29    static_assert( std::is_class_v<const volatile T>, "");
30#endif
31}
32
33template <class T>
34void test_is_not_class()
35{
36    static_assert(!std::is_class<T>::value, "");
37    static_assert(!std::is_class<const T>::value, "");
38    static_assert(!std::is_class<volatile T>::value, "");
39    static_assert(!std::is_class<const volatile T>::value, "");
40#if TEST_STD_VER > 14
41    static_assert(!std::is_class_v<T>, "");
42    static_assert(!std::is_class_v<const T>, "");
43    static_assert(!std::is_class_v<volatile T>, "");
44    static_assert(!std::is_class_v<const volatile T>, "");
45#endif
46}
47
48class Empty
49{
50};
51
52class NotEmpty
53{
54    virtual ~NotEmpty();
55};
56
57union Union {};
58
59struct bit_zero
60{
61    int :  0;
62};
63
64class Abstract
65{
66    virtual ~Abstract() = 0;
67};
68
69enum Enum {zero, one};
70struct incomplete_type;
71
72typedef void (*FunctionPtr)();
73
74int main()
75{
76    test_is_class<Empty>();
77    test_is_class<bit_zero>();
78    test_is_class<NotEmpty>();
79    test_is_class<Abstract>();
80    test_is_class<incomplete_type>();
81
82#if TEST_STD_VER >= 11
83// In C++03 we have an emulation of std::nullptr_t
84    test_is_not_class<std::nullptr_t>();
85#endif
86    test_is_not_class<void>();
87    test_is_not_class<int>();
88    test_is_not_class<int&>();
89#if TEST_STD_VER >= 11
90    test_is_not_class<int&&>();
91#endif
92    test_is_not_class<int*>();
93    test_is_not_class<double>();
94    test_is_not_class<const int*>();
95    test_is_not_class<char[3]>();
96    test_is_not_class<char[]>();
97    test_is_not_class<Enum>();
98    test_is_not_class<Union>();
99    test_is_not_class<FunctionPtr>();
100}
101