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 U& v);
13// template <class T, class U> constexpr bool operator!=(const U& v, const optional<T>& x);
14
15#include <optional>
16
17#include "test_comparisons.h"
18#include "test_macros.h"
19
20#if TEST_STD_VER >= 26
21
22// Test SFINAE.
23
24static_assert(HasOperatorNotEqual<int, std::optional<int>>);
25static_assert(HasOperatorNotEqual<int, std::optional<EqualityComparable>>);
26static_assert(HasOperatorNotEqual<EqualityComparable, std::optional<EqualityComparable>>);
27
28static_assert(!HasOperatorNotEqual<NonComparable, std::optional<NonComparable>>);
29static_assert(!HasOperatorNotEqual<NonComparable, std::optional<EqualityComparable>>);
30
31static_assert(HasOperatorNotEqual<std::optional<int>, int>);
32static_assert(HasOperatorNotEqual<std::optional<EqualityComparable>, int>);
33static_assert(HasOperatorNotEqual<std::optional<EqualityComparable>, EqualityComparable>);
34
35static_assert(!HasOperatorNotEqual<std::optional<NonComparable>, NonComparable>);
36static_assert(!HasOperatorNotEqual<std::optional<EqualityComparable>, NonComparable>);
37
38#endif
39
40using std::optional;
41
42struct X {
43 int i_;
44
45 constexpr X(int i) : i_(i) {}
46};
47
48constexpr bool operator!=(const X& lhs, const X& rhs) {
49 return lhs.i_ != rhs.i_;
50}
51
52int main(int, char**) {
53 {
54 typedef X T;
55 typedef optional<T> O;
56
57 constexpr T val(2);
58 constexpr O o1; // disengaged
59 constexpr O o2{1}; // engaged
60 constexpr O o3{val}; // engaged
61
62 static_assert((o1 != T(1)), "");
63 static_assert(!(o2 != T(1)), "");
64 static_assert((o3 != T(1)), "");
65 static_assert(!(o3 != T(2)), "");
66 static_assert(!(o3 != val), "");
67
68 static_assert((T(1) != o1), "");
69 static_assert(!(T(1) != o2), "");
70 static_assert((T(1) != o3), "");
71 static_assert(!(T(2) != o3), "");
72 static_assert(!(val != o3), "");
73 }
74 {
75 using O = optional<int>;
76 constexpr O o1(42);
77 static_assert(o1 != 101l, "");
78 static_assert(!(42l != o1), "");
79 }
80 {
81 using O = optional<const int>;
82 constexpr O o1(42);
83 static_assert(o1 != 101, "");
84 static_assert(!(42 != o1), "");
85 }
86
87 return 0;
88}
89

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