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 // UNSUPPORTED: c++03, c++11, c++14, c++17
10 // UNSUPPORTED: libcpp-no-concepts
11 
12 // template<class T>
13 // concept equality_comparable = // see below
14 
15 #include <concepts>
16 
17 #include <array>
18 #include <deque>
19 #include <forward_list>
20 #include <list>
21 #include <map>
22 #include <memory>
23 #include <mutex>
24 #include <optional>
25 #include <set>
26 #include <unordered_map>
27 #include <unordered_set>
28 #include <vector>
29 
30 #include "../types.h"
31 
32 namespace fundamentals {
33 static_assert(std::equality_comparable<int>);
34 static_assert(std::equality_comparable<double>);
35 static_assert(std::equality_comparable<void*>);
36 static_assert(std::equality_comparable<char*>);
37 static_assert(std::equality_comparable<char const*>);
38 static_assert(std::equality_comparable<char volatile*>);
39 static_assert(std::equality_comparable<char const volatile*>);
40 static_assert(std::equality_comparable<wchar_t&>);
41 static_assert(std::equality_comparable<char8_t const&>);
42 static_assert(std::equality_comparable<char16_t volatile&>);
43 static_assert(std::equality_comparable<char32_t const volatile&>);
44 static_assert(std::equality_comparable<unsigned char&&>);
45 static_assert(std::equality_comparable<unsigned short const&&>);
46 static_assert(std::equality_comparable<unsigned int volatile&&>);
47 static_assert(std::equality_comparable<unsigned long const volatile&&>);
48 static_assert(std::equality_comparable<int[5]>);
49 static_assert(std::equality_comparable<int (*)(int)>);
50 static_assert(std::equality_comparable<int (&)(int)>);
51 static_assert(std::equality_comparable<int (*)(int) noexcept>);
52 static_assert(std::equality_comparable<int (&)(int) noexcept>);
53 static_assert(std::equality_comparable<std::nullptr_t>);
54 
55 struct S {};
56 static_assert(std::equality_comparable<int S::*>);
57 static_assert(std::equality_comparable<int (S::*)()>);
58 static_assert(std::equality_comparable<int (S::*)() noexcept>);
59 static_assert(std::equality_comparable<int (S::*)() &>);
60 static_assert(std::equality_comparable<int (S::*)() & noexcept>);
61 static_assert(std::equality_comparable<int (S::*)() &&>);
62 static_assert(std::equality_comparable<int (S::*)() && noexcept>);
63 static_assert(std::equality_comparable<int (S::*)() const>);
64 static_assert(std::equality_comparable<int (S::*)() const noexcept>);
65 static_assert(std::equality_comparable<int (S::*)() const&>);
66 static_assert(std::equality_comparable<int (S::*)() const & noexcept>);
67 static_assert(std::equality_comparable<int (S::*)() const&&>);
68 static_assert(std::equality_comparable<int (S::*)() const && noexcept>);
69 static_assert(std::equality_comparable<int (S::*)() volatile>);
70 static_assert(std::equality_comparable<int (S::*)() volatile noexcept>);
71 static_assert(std::equality_comparable<int (S::*)() volatile&>);
72 static_assert(std::equality_comparable<int (S::*)() volatile & noexcept>);
73 static_assert(std::equality_comparable<int (S::*)() volatile&&>);
74 static_assert(std::equality_comparable<int (S::*)() volatile && noexcept>);
75 static_assert(std::equality_comparable<int (S::*)() const volatile>);
76 static_assert(std::equality_comparable<int (S::*)() const volatile noexcept>);
77 static_assert(std::equality_comparable<int (S::*)() const volatile&>);
78 static_assert(std::equality_comparable<int (S::*)() const volatile & noexcept>);
79 static_assert(std::equality_comparable<int (S::*)() const volatile&&>);
80 static_assert(
81     std::equality_comparable<int (S::*)() const volatile && noexcept>);
82 
83 static_assert(!std::equality_comparable<void>);
84 } // namespace fundamentals
85 
86 namespace standard_types {
87 static_assert(std::equality_comparable<std::array<int, 10> >);
88 static_assert(std::equality_comparable<std::deque<int> >);
89 static_assert(std::equality_comparable<std::forward_list<int> >);
90 static_assert(std::equality_comparable<std::list<int> >);
91 
92 #ifndef _LIBCPP_HAS_NO_THREADS
93 static_assert(!std::equality_comparable<std::lock_guard<std::mutex> >);
94 static_assert(std::equality_comparable<std::map<int, void*> >);
95 static_assert(!std::equality_comparable<std::mutex>);
96 static_assert(
97     !std::equality_comparable<std::optional<std::lock_guard<std::mutex> > >);
98 static_assert(!std::equality_comparable<std::optional<std::mutex> >);
99 #endif
100 
101 static_assert(std::equality_comparable<std::optional<int> >);
102 static_assert(std::equality_comparable<std::set<int> >);
103 static_assert(std::equality_comparable<std::unordered_map<int, void*> >);
104 static_assert(std::equality_comparable<std::unordered_set<int> >);
105 static_assert(std::equality_comparable<std::vector<bool> >);
106 static_assert(std::equality_comparable<std::vector<int> >);
107 } // namespace standard_types
108 
109 namespace types_fit_for_purpose {
110 static_assert(std::equality_comparable<cxx20_member_eq>);
111 static_assert(std::equality_comparable<cxx20_friend_eq>);
112 static_assert(std::equality_comparable<member_three_way_comparable>);
113 static_assert(std::equality_comparable<friend_three_way_comparable>);
114 static_assert(std::equality_comparable<explicit_operators>);
115 static_assert(std::equality_comparable<different_return_types>);
116 static_assert(std::equality_comparable<one_member_one_friend>);
117 static_assert(std::equality_comparable<equality_comparable_with_ec1>);
118 
119 static_assert(!std::equality_comparable<no_eq>);
120 static_assert(!std::equality_comparable<no_neq>);
121 static_assert(std::equality_comparable<no_lt>);
122 static_assert(std::equality_comparable<no_gt>);
123 static_assert(std::equality_comparable<no_le>);
124 static_assert(std::equality_comparable<no_ge>);
125 
126 static_assert(!std::equality_comparable<wrong_return_type_eq>);
127 static_assert(!std::equality_comparable<wrong_return_type_ne>);
128 static_assert(std::equality_comparable<wrong_return_type_lt>);
129 static_assert(std::equality_comparable<wrong_return_type_gt>);
130 static_assert(std::equality_comparable<wrong_return_type_le>);
131 static_assert(std::equality_comparable<wrong_return_type_ge>);
132 static_assert(!std::equality_comparable<wrong_return_type>);
133 static_assert(
134     !std::equality_comparable<cxx20_member_eq_operator_with_deleted_ne>);
135 static_assert(
136     !std::equality_comparable<cxx20_friend_eq_operator_with_deleted_ne>);
137 static_assert(
138     !std::equality_comparable<member_three_way_comparable_with_deleted_eq>);
139 static_assert(
140     !std::equality_comparable<member_three_way_comparable_with_deleted_ne>);
141 static_assert(
142     !std::equality_comparable<friend_three_way_comparable_with_deleted_eq>);
143 static_assert(
144     !std::equality_comparable<friend_three_way_comparable_with_deleted_ne>);
145 
146 static_assert(!std::equality_comparable<eq_returns_explicit_bool>);
147 static_assert(!std::equality_comparable<ne_returns_explicit_bool>);
148 static_assert(std::equality_comparable<lt_returns_explicit_bool>);
149 static_assert(std::equality_comparable<gt_returns_explicit_bool>);
150 static_assert(std::equality_comparable<le_returns_explicit_bool>);
151 static_assert(std::equality_comparable<ge_returns_explicit_bool>);
152 static_assert(std::equality_comparable<returns_true_type>);
153 static_assert(std::equality_comparable<returns_int_ptr>);
154 } // namespace types_fit_for_purpose
155 
156 int main(int, char**) { return 0; }
157