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, c++20, c++23
10
11 // <functional>
12
13 // class reference_wrapper
14
15 // [refwrap.comparisons], comparisons
16
17 // friend constexpr bool operator==(reference_wrapper, const T&); // Since C++26
18
19 #include <cassert>
20 #include <concepts>
21 #include <functional>
22
23 #include "test_comparisons.h"
24 #include "test_macros.h"
25
26 #include "helper_concepts.h"
27 #include "helper_types.h"
28
29 // Test SFINAE.
30
31 static_assert(HasEqualityOperatorWithInt<std::reference_wrapper<EqualityComparable>>);
32
33 static_assert(!HasEqualityOperatorWithInt<std::reference_wrapper<NonComparable>>);
34
35 // Test equality.
36
37 template <typename T>
test()38 constexpr void test() {
39 T i{92};
40 T j{84};
41
42 std::reference_wrapper<T> rw1{i};
43
44 // refwrap, const&
45 AssertEqualityReturnBool<decltype(rw1), decltype(i)>();
46 assert(testEquality(rw1, i, true));
47 assert(testEquality(rw1, j, false));
48 }
49
test()50 constexpr bool test() {
51 test<int>();
52 test<EqualityComparable>();
53
54 return true;
55 }
56
main(int,char **)57 int main(int, char**) {
58 test();
59 static_assert(test());
60
61 return 0;
62 }
63