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_abstract
12
13#include <type_traits>
14#include "test_macros.h"
15
16template <class T>
17void test_is_abstract()
18{
19 static_assert( std::is_abstract<T>::value, "");
20 static_assert( std::is_abstract<const T>::value, "");
21 static_assert( std::is_abstract<volatile T>::value, "");
22 static_assert( std::is_abstract<const volatile T>::value, "");
23#if TEST_STD_VER > 14
24 static_assert( std::is_abstract_v<T>, "");
25 static_assert( std::is_abstract_v<const T>, "");
26 static_assert( std::is_abstract_v<volatile T>, "");
27 static_assert( std::is_abstract_v<const volatile T>, "");
28#endif
29}
30
31template <class T>
32void test_is_not_abstract()
33{
34 static_assert(!std::is_abstract<T>::value, "");
35 static_assert(!std::is_abstract<const T>::value, "");
36 static_assert(!std::is_abstract<volatile T>::value, "");
37 static_assert(!std::is_abstract<const volatile T>::value, "");
38#if TEST_STD_VER > 14
39 static_assert(!std::is_abstract_v<T>, "");
40 static_assert(!std::is_abstract_v<const T>, "");
41 static_assert(!std::is_abstract_v<volatile T>, "");
42 static_assert(!std::is_abstract_v<const volatile T>, "");
43#endif
44}
45
46class Empty
47{
48};
49
50class NotEmpty
51{
52 virtual ~NotEmpty();
53};
54
55union Union {};
56
57struct bit_zero
58{
59 int : 0;
60};
61
62class Abstract
63{
64 virtual ~Abstract() = 0;
65};
66
67template <class>
68struct AbstractTemplate {
69 virtual void test() = 0;
70};
71
72template <>
73struct AbstractTemplate<double> {};
74
75int main(int, char**)
76{
77 test_is_not_abstract<void>();
78 test_is_not_abstract<int&>();
79 test_is_not_abstract<int>();
80 test_is_not_abstract<double>();
81 test_is_not_abstract<int*>();
82 test_is_not_abstract<const int*>();
83 test_is_not_abstract<char[3]>();
84 test_is_not_abstract<char[]>();
85 test_is_not_abstract<Union>();
86 test_is_not_abstract<Empty>();
87 test_is_not_abstract<bit_zero>();
88 test_is_not_abstract<NotEmpty>();
89
90 test_is_abstract<Abstract>();
91 test_is_abstract<AbstractTemplate<int> >();
92 test_is_not_abstract<AbstractTemplate<double> >();
93
94 return 0;
95}
96

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