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_default_constructible
12
13 #include <type_traits>
14 #include "test_macros.h"
15
16 template <class T>
test_is_default_constructible()17 void test_is_default_constructible()
18 {
19 static_assert( std::is_default_constructible<T>::value, "");
20 static_assert( std::is_default_constructible<const T>::value, "");
21 static_assert( std::is_default_constructible<volatile T>::value, "");
22 static_assert( std::is_default_constructible<const volatile T>::value, "");
23 #if TEST_STD_VER > 14
24 static_assert( std::is_default_constructible_v<T>, "");
25 static_assert( std::is_default_constructible_v<const T>, "");
26 static_assert( std::is_default_constructible_v<volatile T>, "");
27 static_assert( std::is_default_constructible_v<const volatile T>, "");
28 #endif
29 }
30
31 template <class T>
test_is_not_default_constructible()32 void test_is_not_default_constructible()
33 {
34 static_assert(!std::is_default_constructible<T>::value, "");
35 static_assert(!std::is_default_constructible<const T>::value, "");
36 static_assert(!std::is_default_constructible<volatile T>::value, "");
37 static_assert(!std::is_default_constructible<const volatile T>::value, "");
38 #if TEST_STD_VER > 14
39 static_assert(!std::is_default_constructible_v<T>, "");
40 static_assert(!std::is_default_constructible_v<const T>, "");
41 static_assert(!std::is_default_constructible_v<volatile T>, "");
42 static_assert(!std::is_default_constructible_v<const volatile T>, "");
43 #endif
44 }
45
46 class Empty
47 {
48 };
49
50 class NoDefaultConstructor
51 {
NoDefaultConstructor(int)52 NoDefaultConstructor(int) {}
53 };
54
55 class NotEmpty
56 {
57 public:
58 virtual ~NotEmpty();
59 };
60
61 union Union {};
62
63 struct bit_zero
64 {
65 int : 0;
66 };
67
68 class Abstract
69 {
70 public:
71 virtual ~Abstract() = 0;
72 };
73
74 struct A
75 {
76 A();
77 };
78
79 class B
80 {
81 B();
82 };
83
main(int,char **)84 int main(int, char**)
85 {
86 test_is_default_constructible<A>();
87 test_is_default_constructible<Union>();
88 test_is_default_constructible<Empty>();
89 test_is_default_constructible<int>();
90 test_is_default_constructible<double>();
91 test_is_default_constructible<int*>();
92 test_is_default_constructible<const int*>();
93 test_is_default_constructible<char[3]>();
94 test_is_default_constructible<char[5][3]>();
95
96 test_is_default_constructible<NotEmpty>();
97 test_is_default_constructible<bit_zero>();
98
99 test_is_not_default_constructible<void>();
100 test_is_not_default_constructible<int&>();
101 test_is_not_default_constructible<char[]>();
102 test_is_not_default_constructible<char[][3]>();
103
104 test_is_not_default_constructible<Abstract>();
105 test_is_not_default_constructible<NoDefaultConstructor>();
106 #if TEST_STD_VER >= 11
107 test_is_not_default_constructible<B>();
108 test_is_not_default_constructible<int&&>();
109
110 // TODO: Remove this workaround once Clang <= 3.7 are no longer used regularly.
111 // In those compiler versions the __is_constructible builtin gives the wrong
112 // results for abominable function types.
113 #if (defined(TEST_APPLE_CLANG_VER) && TEST_APPLE_CLANG_VER < 703) \
114 || (defined(TEST_CLANG_VER) && TEST_CLANG_VER < 308)
115 #define WORKAROUND_CLANG_BUG
116 #endif
117 #if !defined(WORKAROUND_CLANG_BUG)
118 test_is_not_default_constructible<void()>();
119 test_is_not_default_constructible<void() const> ();
120 test_is_not_default_constructible<void() volatile> ();
121 test_is_not_default_constructible<void() &> ();
122 test_is_not_default_constructible<void() &&> ();
123 #endif
124 #endif
125
126 return 0;
127 }
128