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 <optional>
24 #include <set>
25 #include <unordered_map>
26 #include <unordered_set>
27 #include <vector>
28 
29 #include "compare_types.h"
30 
31 namespace fundamentals {
32 static_assert(std::equality_comparable<int>);
33 static_assert(std::equality_comparable<double>);
34 static_assert(std::equality_comparable<void*>);
35 static_assert(std::equality_comparable<char*>);
36 static_assert(std::equality_comparable<char const*>);
37 static_assert(std::equality_comparable<char volatile*>);
38 static_assert(std::equality_comparable<char const volatile*>);
39 static_assert(std::equality_comparable<wchar_t&>);
40 static_assert(std::equality_comparable<char8_t const&>);
41 static_assert(std::equality_comparable<char16_t volatile&>);
42 static_assert(std::equality_comparable<char32_t const volatile&>);
43 static_assert(std::equality_comparable<unsigned char&&>);
44 static_assert(std::equality_comparable<unsigned short const&&>);
45 static_assert(std::equality_comparable<unsigned int volatile&&>);
46 static_assert(std::equality_comparable<unsigned long const volatile&&>);
47 static_assert(std::equality_comparable<int[5]>);
48 static_assert(std::equality_comparable<int (*)(int)>);
49 static_assert(std::equality_comparable<int (&)(int)>);
50 static_assert(std::equality_comparable<int (*)(int) noexcept>);
51 static_assert(std::equality_comparable<int (&)(int) noexcept>);
52 static_assert(std::equality_comparable<std::nullptr_t>);
53 
54 struct S {};
55 static_assert(std::equality_comparable<int S::*>);
56 static_assert(std::equality_comparable<int (S::*)()>);
57 static_assert(std::equality_comparable<int (S::*)() noexcept>);
58 static_assert(std::equality_comparable<int (S::*)() &>);
59 static_assert(std::equality_comparable<int (S::*)() & noexcept>);
60 static_assert(std::equality_comparable<int (S::*)() &&>);
61 static_assert(std::equality_comparable<int (S::*)() && noexcept>);
62 static_assert(std::equality_comparable<int (S::*)() const>);
63 static_assert(std::equality_comparable<int (S::*)() const noexcept>);
64 static_assert(std::equality_comparable<int (S::*)() const&>);
65 static_assert(std::equality_comparable<int (S::*)() const & noexcept>);
66 static_assert(std::equality_comparable<int (S::*)() const&&>);
67 static_assert(std::equality_comparable<int (S::*)() const && noexcept>);
68 static_assert(std::equality_comparable<int (S::*)() volatile>);
69 static_assert(std::equality_comparable<int (S::*)() volatile noexcept>);
70 static_assert(std::equality_comparable<int (S::*)() volatile&>);
71 static_assert(std::equality_comparable<int (S::*)() volatile & noexcept>);
72 static_assert(std::equality_comparable<int (S::*)() volatile&&>);
73 static_assert(std::equality_comparable<int (S::*)() volatile && noexcept>);
74 static_assert(std::equality_comparable<int (S::*)() const volatile>);
75 static_assert(std::equality_comparable<int (S::*)() const volatile noexcept>);
76 static_assert(std::equality_comparable<int (S::*)() const volatile&>);
77 static_assert(std::equality_comparable<int (S::*)() const volatile & noexcept>);
78 static_assert(std::equality_comparable<int (S::*)() const volatile&&>);
79 static_assert(
80     std::equality_comparable<int (S::*)() const volatile && noexcept>);
81 
82 static_assert(!std::equality_comparable<void>);
83 } // namespace fundamentals
84 
85 namespace standard_types {
86 static_assert(std::equality_comparable<std::array<int, 10>>);
87 static_assert(std::equality_comparable<std::deque<int>>);
88 static_assert(std::equality_comparable<std::forward_list<int>>);
89 static_assert(std::equality_comparable<std::list<int>>);
90 static_assert(std::equality_comparable<std::map<int, void*>>);
91 static_assert(std::equality_comparable<std::optional<int>>);
92 static_assert(std::equality_comparable<std::set<int>>);
93 static_assert(std::equality_comparable<std::unordered_map<int, void*>>);
94 static_assert(std::equality_comparable<std::unordered_set<int>>);
95 static_assert(std::equality_comparable<std::vector<bool>>);
96 static_assert(std::equality_comparable<std::vector<int>>);
97 } // namespace standard_types
98 
99 namespace types_fit_for_purpose {
100 static_assert(std::equality_comparable<cxx20_member_eq>);
101 static_assert(std::equality_comparable<cxx20_friend_eq>);
102 static_assert(std::equality_comparable<member_three_way_comparable>);
103 static_assert(std::equality_comparable<friend_three_way_comparable>);
104 static_assert(std::equality_comparable<explicit_operators>);
105 static_assert(std::equality_comparable<different_return_types>);
106 static_assert(std::equality_comparable<one_member_one_friend>);
107 static_assert(std::equality_comparable<equality_comparable_with_ec1>);
108 
109 static_assert(!std::equality_comparable<no_eq>);
110 static_assert(!std::equality_comparable<no_neq>);
111 static_assert(std::equality_comparable<no_lt>);
112 static_assert(std::equality_comparable<no_gt>);
113 static_assert(std::equality_comparable<no_le>);
114 static_assert(std::equality_comparable<no_ge>);
115 
116 static_assert(!std::equality_comparable<wrong_return_type_eq>);
117 static_assert(!std::equality_comparable<wrong_return_type_ne>);
118 static_assert(std::equality_comparable<wrong_return_type_lt>);
119 static_assert(std::equality_comparable<wrong_return_type_gt>);
120 static_assert(std::equality_comparable<wrong_return_type_le>);
121 static_assert(std::equality_comparable<wrong_return_type_ge>);
122 static_assert(!std::equality_comparable<wrong_return_type>);
123 static_assert(
124     !std::equality_comparable<cxx20_member_eq_operator_with_deleted_ne>);
125 static_assert(
126     !std::equality_comparable<cxx20_friend_eq_operator_with_deleted_ne>);
127 static_assert(
128     !std::equality_comparable<member_three_way_comparable_with_deleted_eq>);
129 static_assert(
130     !std::equality_comparable<member_three_way_comparable_with_deleted_ne>);
131 static_assert(
132     !std::equality_comparable<friend_three_way_comparable_with_deleted_eq>);
133 static_assert(
134     !std::equality_comparable<friend_three_way_comparable_with_deleted_ne>);
135 
136 static_assert(!std::equality_comparable<eq_returns_explicit_bool>);
137 static_assert(!std::equality_comparable<ne_returns_explicit_bool>);
138 static_assert(std::equality_comparable<lt_returns_explicit_bool>);
139 static_assert(std::equality_comparable<gt_returns_explicit_bool>);
140 static_assert(std::equality_comparable<le_returns_explicit_bool>);
141 static_assert(std::equality_comparable<ge_returns_explicit_bool>);
142 static_assert(std::equality_comparable<returns_true_type>);
143 static_assert(std::equality_comparable<returns_int_ptr>);
144 } // namespace types_fit_for_purpose
145 
146 int main(int, char**) { return 0; }
147