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
11// <variant>
12
13// template <class ...Types>
14// constexpr bool
15// operator==(variant<Types...> const&, variant<Types...> const&) noexcept;
16//
17// template <class ...Types>
18// constexpr bool
19// operator!=(variant<Types...> const&, variant<Types...> const&) noexcept;
20//
21// template <class ...Types>
22// constexpr bool
23// operator<(variant<Types...> const&, variant<Types...> const&) noexcept;
24//
25// template <class ...Types>
26// constexpr bool
27// operator>(variant<Types...> const&, variant<Types...> const&) noexcept;
28//
29// template <class ...Types>
30// constexpr bool
31// operator<=(variant<Types...> const&, variant<Types...> const&) noexcept;
32//
33// template <class ...Types>
34// constexpr bool
35// operator>=(variant<Types...> const&, variant<Types...> const&) noexcept;
36
37#include <cassert>
38#include <type_traits>
39#include <utility>
40#include <variant>
41
42#include "test_macros.h"
43
44
45struct MyBoolExplicit {
46 bool value;
47 constexpr explicit MyBoolExplicit(bool v) : value(v) {}
48 constexpr explicit operator bool() const noexcept { return value; }
49};
50
51struct ComparesToMyBoolExplicit {
52 int value = 0;
53};
54inline constexpr MyBoolExplicit operator==(const ComparesToMyBoolExplicit& LHS, const ComparesToMyBoolExplicit& RHS) noexcept {
55 return MyBoolExplicit(LHS.value == RHS.value);
56}
57inline constexpr MyBoolExplicit operator!=(const ComparesToMyBoolExplicit& LHS, const ComparesToMyBoolExplicit& RHS) noexcept {
58 return MyBoolExplicit(LHS.value != RHS.value);
59}
60inline constexpr MyBoolExplicit operator<(const ComparesToMyBoolExplicit& LHS, const ComparesToMyBoolExplicit& RHS) noexcept {
61 return MyBoolExplicit(LHS.value < RHS.value);
62}
63inline constexpr MyBoolExplicit operator<=(const ComparesToMyBoolExplicit& LHS, const ComparesToMyBoolExplicit& RHS) noexcept {
64 return MyBoolExplicit(LHS.value <= RHS.value);
65}
66inline constexpr MyBoolExplicit operator>(const ComparesToMyBoolExplicit& LHS, const ComparesToMyBoolExplicit& RHS) noexcept {
67 return MyBoolExplicit(LHS.value > RHS.value);
68}
69inline constexpr MyBoolExplicit operator>=(const ComparesToMyBoolExplicit& LHS, const ComparesToMyBoolExplicit& RHS) noexcept {
70 return MyBoolExplicit(LHS.value >= RHS.value);
71}
72
73
74int main(int, char**) {
75 using V = std::variant<int, ComparesToMyBoolExplicit>;
76 V v1(42);
77 V v2(101);
78 // expected-error-re@variant:* 6 {{static assertion failed{{.*}}the relational operator does not return a type which is implicitly convertible to bool}}
79 // expected-error@variant:* 6 {{no viable conversion}}
80 (void)(v1 == v2); // expected-note {{here}}
81 (void)(v1 != v2); // expected-note {{here}}
82 (void)(v1 < v2); // expected-note {{here}}
83 (void)(v1 <= v2); // expected-note {{here}}
84 (void)(v1 > v2); // expected-note {{here}}
85 (void)(v1 >= v2); // expected-note {{here}}
86
87 return 0;
88}
89

source code of libcxx/test/std/utilities/variant/variant.relops/relops_bool_conv.verify.cpp