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_void
13
14#include <type_traits>
15#include <cstddef>        // for std::nullptr_t
16#include "test_macros.h"
17
18template <class T>
19void test_is_void()
20{
21    static_assert( std::is_void<T>::value, "");
22    static_assert( std::is_void<const T>::value, "");
23    static_assert( std::is_void<volatile T>::value, "");
24    static_assert( std::is_void<const volatile T>::value, "");
25#if TEST_STD_VER > 14
26    static_assert( std::is_void_v<T>, "");
27    static_assert( std::is_void_v<const T>, "");
28    static_assert( std::is_void_v<volatile T>, "");
29    static_assert( std::is_void_v<const volatile T>, "");
30#endif
31}
32
33template <class T>
34void test_is_not_void()
35{
36    static_assert(!std::is_void<T>::value, "");
37    static_assert(!std::is_void<const T>::value, "");
38    static_assert(!std::is_void<volatile T>::value, "");
39    static_assert(!std::is_void<const volatile T>::value, "");
40#if TEST_STD_VER > 14
41    static_assert(!std::is_void_v<T>, "");
42    static_assert(!std::is_void_v<const T>, "");
43    static_assert(!std::is_void_v<volatile T>, "");
44    static_assert(!std::is_void_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_void<void>();
77
78    test_is_not_void<int>();
79    test_is_not_void<int*>();
80    test_is_not_void<int&>();
81    test_is_not_void<int&&>();
82    test_is_not_void<double>();
83    test_is_not_void<const int*>();
84    test_is_not_void<char[3]>();
85    test_is_not_void<char[]>();
86    test_is_not_void<Union>();
87    test_is_not_void<Empty>();
88    test_is_not_void<bit_zero>();
89    test_is_not_void<NotEmpty>();
90    test_is_not_void<Abstract>();
91    test_is_not_void<Enum>();
92    test_is_not_void<FunctionPtr>();
93    test_is_not_void<incomplete_type>();
94}
95