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_function
13
14 #include <type_traits>
15 #include <cstddef> // for std::nullptr_t
16
17 #include "test_macros.h"
18
19 template <class T>
test_is_function()20 void test_is_function()
21 {
22 static_assert( std::is_function<T>::value, "");
23 static_assert( std::is_function<const T>::value, "");
24 static_assert( std::is_function<volatile T>::value, "");
25 static_assert( std::is_function<const volatile T>::value, "");
26 #if TEST_STD_VER > 14
27 static_assert( std::is_function_v<T>, "");
28 static_assert( std::is_function_v<const T>, "");
29 static_assert( std::is_function_v<volatile T>, "");
30 static_assert( std::is_function_v<const volatile T>, "");
31 #endif
32 }
33
34 template <class T>
test_is_not_function()35 void test_is_not_function()
36 {
37 static_assert(!std::is_function<T>::value, "");
38 static_assert(!std::is_function<const T>::value, "");
39 static_assert(!std::is_function<volatile T>::value, "");
40 static_assert(!std::is_function<const volatile T>::value, "");
41 #if TEST_STD_VER > 14
42 static_assert(!std::is_function_v<T>, "");
43 static_assert(!std::is_function_v<const T>, "");
44 static_assert(!std::is_function_v<volatile T>, "");
45 static_assert(!std::is_function_v<const volatile T>, "");
46 #endif
47 }
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 struct incomplete_type;
72
73 typedef void (*FunctionPtr)();
74
main()75 int main()
76 {
77 test_is_function<void(void)>();
78 test_is_function<int(int)>();
79 test_is_function<int(int, double)>();
80 test_is_function<int(Abstract *)>();
81 test_is_function<void(...)>();
82
83 test_is_not_function<std::nullptr_t>();
84 test_is_not_function<void>();
85 test_is_not_function<int>();
86 test_is_not_function<int&>();
87 test_is_not_function<int&&>();
88 test_is_not_function<int*>();
89 test_is_not_function<double>();
90 test_is_not_function<char[3]>();
91 test_is_not_function<char[]>();
92 test_is_not_function<Union>();
93 test_is_not_function<Enum>();
94 test_is_not_function<FunctionPtr>(); // function pointer is not a function
95 test_is_not_function<Empty>();
96 test_is_not_function<bit_zero>();
97 test_is_not_function<NotEmpty>();
98 test_is_not_function<Abstract>();
99 test_is_not_function<Abstract*>();
100 test_is_not_function<incomplete_type>();
101
102 #if TEST_STD_VER >= 11
103 test_is_function<void() noexcept>();
104 test_is_function<void() const && noexcept>();
105 #endif
106 }
107