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_default_constructible
13
14#include <type_traits>
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}
24
25template <class T>
26void test_is_not_default_constructible()
27{
28    static_assert(!std::is_default_constructible<T>::value, "");
29    static_assert(!std::is_default_constructible<const T>::value, "");
30    static_assert(!std::is_default_constructible<volatile T>::value, "");
31    static_assert(!std::is_default_constructible<const volatile T>::value, "");
32}
33
34class Empty
35{
36};
37
38class NotEmpty
39{
40public:
41    virtual ~NotEmpty();
42};
43
44union Union {};
45
46struct bit_zero
47{
48    int :  0;
49};
50
51class Abstract
52{
53public:
54    virtual ~Abstract() = 0;
55};
56
57struct A
58{
59    A();
60};
61
62class B
63{
64    B();
65};
66
67int main()
68{
69    test_is_default_constructible<A>();
70    test_is_default_constructible<Union>();
71    test_is_default_constructible<Empty>();
72    test_is_default_constructible<int>();
73    test_is_default_constructible<double>();
74    test_is_default_constructible<int*>();
75    test_is_default_constructible<const int*>();
76    test_is_default_constructible<char[3]>();
77    test_is_default_constructible<NotEmpty>();
78    test_is_default_constructible<bit_zero>();
79
80    test_is_not_default_constructible<void>();
81    test_is_not_default_constructible<int&>();
82    test_is_not_default_constructible<char[]>();
83    test_is_not_default_constructible<Abstract>();
84#if __has_feature(cxx_access_control_sfinae)
85    test_is_not_default_constructible<B>();
86#endif
87}
88