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
10 // <optional>
11
12 // template <class T, class U> constexpr bool operator==(const optional<T>& x, const optional<U>& y);
13
14 #include <optional>
15 #include <type_traits>
16 #include <cassert>
17
18 #include "test_macros.h"
19
20 using std::optional;
21
22 struct X {
23 int i_;
24
XX25 constexpr X(int i) : i_(i) {}
26 };
27
operator ==(const X & lhs,const X & rhs)28 constexpr bool operator==(const X& lhs, const X& rhs) {
29 return lhs.i_ == rhs.i_;
30 }
31
main(int,char **)32 int main(int, char**) {
33 {
34 typedef X T;
35 typedef optional<T> O;
36
37 constexpr O o1; // disengaged
38 constexpr O o2; // disengaged
39 constexpr O o3{1}; // engaged
40 constexpr O o4{2}; // engaged
41 constexpr O o5{1}; // engaged
42
43 static_assert(o1 == o1, "");
44 static_assert(o1 == o2, "");
45 static_assert(!(o1 == o3), "");
46 static_assert(!(o1 == o4), "");
47 static_assert(!(o1 == o5), "");
48
49 static_assert(o2 == o1, "");
50 static_assert(o2 == o2, "");
51 static_assert(!(o2 == o3), "");
52 static_assert(!(o2 == o4), "");
53 static_assert(!(o2 == o5), "");
54
55 static_assert(!(o3 == o1), "");
56 static_assert(!(o3 == o2), "");
57 static_assert(o3 == o3, "");
58 static_assert(!(o3 == o4), "");
59 static_assert(o3 == o5, "");
60
61 static_assert(!(o4 == o1), "");
62 static_assert(!(o4 == o2), "");
63 static_assert(!(o4 == o3), "");
64 static_assert(o4 == o4, "");
65 static_assert(!(o4 == o5), "");
66
67 static_assert(!(o5 == o1), "");
68 static_assert(!(o5 == o2), "");
69 static_assert(o5 == o3, "");
70 static_assert(!(o5 == o4), "");
71 static_assert(o5 == o5, "");
72 }
73 {
74 using O1 = optional<int>;
75 using O2 = optional<long>;
76 constexpr O1 o1(42);
77 static_assert(o1 == O2(42), "");
78 static_assert(!(O2(101) == o1), "");
79 }
80 {
81 using O1 = optional<int>;
82 using O2 = optional<const int>;
83 constexpr O1 o1(42);
84 static_assert(o1 == O2(42), "");
85 static_assert(!(O2(101) == o1), "");
86 }
87
88 return 0;
89 }
90