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
16template <class T>
17void 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
31template <class T>
32void 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
46class Empty
47{
48};
49
50class NoDefaultConstructor
51{
52 NoDefaultConstructor(int) {}
53};
54
55class NotEmpty
56{
57public:
58 virtual ~NotEmpty();
59};
60
61union Union {};
62
63struct bit_zero
64{
65 int : 0;
66};
67
68class Abstract
69{
70public:
71 virtual ~Abstract() = 0;
72};
73
74struct A
75{
76 A();
77};
78
79class B
80{
81 B();
82};
83
84int 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 test_is_not_default_constructible<void()>();
110 test_is_not_default_constructible<void() const> ();
111 test_is_not_default_constructible<void() volatile> ();
112 test_is_not_default_constructible<void() &> ();
113 test_is_not_default_constructible<void() &&> ();
114#endif
115
116 return 0;
117}
118

source code of libcxx/test/std/utilities/meta/meta.unary/meta.unary.prop/is_default_constructible.pass.cpp