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_comparisons.h"
19#include "test_macros.h"
20
21#if TEST_STD_VER >= 26
22
23// Test SFINAE.
24
25static_assert(HasOperatorNotEqual<std::optional<int>>);
26static_assert(HasOperatorNotEqual<std::optional<EqualityComparable>>);
27static_assert(HasOperatorNotEqual<std::optional<EqualityComparable>, std::optional<int>>);
28
29static_assert(!HasOperatorNotEqual<std::optional<NonComparable>>);
30static_assert(!HasOperatorNotEqual<std::optional<EqualityComparable>, std::optional<NonComparable>>);
31
32#endif
33
34using std::optional;
35
36struct X {
37 int i_;
38
39 constexpr X(int i) : i_(i) {}
40};
41
42constexpr bool operator!=(const X& lhs, const X& rhs) {
43 return lhs.i_ != rhs.i_;
44}
45
46int main(int, char**) {
47 {
48 typedef X T;
49 typedef optional<T> O;
50
51 constexpr O o1; // disengaged
52 constexpr O o2; // disengaged
53 constexpr O o3{1}; // engaged
54 constexpr O o4{2}; // engaged
55 constexpr O o5{1}; // engaged
56
57 static_assert(!(o1 != o1), "");
58 static_assert(!(o1 != o2), "");
59 static_assert((o1 != o3), "");
60 static_assert((o1 != o4), "");
61 static_assert((o1 != o5), "");
62
63 static_assert(!(o2 != o1), "");
64 static_assert(!(o2 != o2), "");
65 static_assert((o2 != o3), "");
66 static_assert((o2 != o4), "");
67 static_assert((o2 != o5), "");
68
69 static_assert((o3 != o1), "");
70 static_assert((o3 != o2), "");
71 static_assert(!(o3 != o3), "");
72 static_assert((o3 != o4), "");
73 static_assert(!(o3 != o5), "");
74
75 static_assert((o4 != o1), "");
76 static_assert((o4 != o2), "");
77 static_assert((o4 != o3), "");
78 static_assert(!(o4 != o4), "");
79 static_assert((o4 != o5), "");
80
81 static_assert((o5 != o1), "");
82 static_assert((o5 != o2), "");
83 static_assert(!(o5 != o3), "");
84 static_assert((o5 != o4), "");
85 static_assert(!(o5 != o5), "");
86 }
87 {
88 using O1 = optional<int>;
89 using O2 = optional<long>;
90 constexpr O1 o1(42);
91 static_assert(o1 != O2(101), "");
92 static_assert(!(O2(42) != o1), "");
93 }
94 {
95 using O1 = optional<int>;
96 using O2 = optional<const int>;
97 constexpr O1 o1(42);
98 static_assert(o1 != O2(101), "");
99 static_assert(!(O2(42) != o1), "");
100 }
101
102 return 0;
103}
104

source code of libcxx/test/std/utilities/optional/optional.relops/not_equal.pass.cpp