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
11 // <functional>
12
13 // ranges::not_equal_to
14
15 #include <cassert>
16 #include <functional>
17 #include <type_traits>
18 #include <utility>
19
20 #include "test_macros.h"
21 #include "compare_types.h"
22 #include "MoveOnly.h"
23 #include "pointer_comparison_test_helper.h"
24
25 struct NotEqualityComparable {
26 friend bool operator==(const NotEqualityComparable&, const NotEqualityComparable&);
27 friend bool operator!=(const NotEqualityComparable&, const NotEqualityComparable&) = delete;
28 };
29
30 static_assert(!std::is_invocable_v<std::ranges::equal_to, NotEqualityComparable, NotEqualityComparable>);
31 static_assert(!std::is_invocable_v<std::ranges::equal_to, int, MoveOnly>);
32 static_assert(std::is_invocable_v<std::ranges::equal_to, explicit_operators, explicit_operators>);
33
34 static_assert(requires { typename std::ranges::not_equal_to::is_transparent; });
35
36 struct PtrAndNotEqOperator {
operator void*PtrAndNotEqOperator37 constexpr operator void*() const { return nullptr; }
38 // We *don't* want operator!= to be picked here.
operator !=(PtrAndNotEqOperator,PtrAndNotEqOperator)39 friend constexpr bool operator!=(PtrAndNotEqOperator, PtrAndNotEqOperator) { return true; }
40 };
41
test()42 constexpr bool test() {
43 auto fn = std::ranges::not_equal_to();
44
45 assert(fn(MoveOnly(41), MoveOnly(42)));
46
47 // These are the opposite of other tests.
48 ForwardingTestObject a;
49 ForwardingTestObject b;
50 assert(fn(a, b));
51 assert(!fn(std::move(a), std::move(b)));
52
53 assert(fn(1, 2));
54 assert(!fn(2, 2));
55 assert(fn(2, 1));
56
57 assert(fn(2, 1L));
58
59 // Make sure that "ranges::equal_to(x, y) == !ranges::not_equal_to(x, y)", even here.
60 assert(!fn(PtrAndNotEqOperator(), PtrAndNotEqOperator()));
61 assert(std::ranges::equal_to()(PtrAndNotEqOperator(), PtrAndNotEqOperator()));
62
63 return true;
64 }
65
main(int,char **)66 int main(int, char**) {
67
68 test();
69 static_assert(test());
70
71 // test total ordering of int* for not_equal_to<int*> and not_equal_to<void>.
72 do_pointer_comparison_test(std::ranges::not_equal_to());
73
74 return 0;
75 }
76