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
16#include "test_comparisons.h"
17#include "test_macros.h"
18
19#if TEST_STD_VER >= 26
20
21// Test SFINAE.
22static_assert(HasOperatorGreaterThan<std::optional<ThreeWayComparable>>);
23static_assert(HasOperatorGreaterThan<std::optional<ThreeWayComparable>, std::optional<int>>);
24
25static_assert(!HasOperatorGreaterThan<std::optional<NonComparable>>);
26static_assert(!HasOperatorGreaterThan<std::optional<EqualityComparable>>);
27static_assert(!HasOperatorGreaterThan<std::optional<ThreeWayComparable>, std::optional<NonComparable>>);
28
29#endif
30
31using std::optional;
32
33struct X {
34 int i_;
35
36 constexpr X(int i) : i_(i) {}
37};
38
39constexpr bool operator>(const X& lhs, const X& rhs) { return lhs.i_ > rhs.i_; }
40
41int main(int, char**) {
42 {
43 typedef optional<X> O;
44
45 constexpr O o1; // disengaged
46 constexpr O o2; // disengaged
47 constexpr O o3{1}; // engaged
48 constexpr O o4{2}; // engaged
49 constexpr O o5{1}; // engaged
50
51 static_assert(!(o1 > o1), "");
52 static_assert(!(o1 > o2), "");
53 static_assert(!(o1 > o3), "");
54 static_assert(!(o1 > o4), "");
55 static_assert(!(o1 > o5), "");
56
57 static_assert(!(o2 > o1), "");
58 static_assert(!(o2 > o2), "");
59 static_assert(!(o2 > o3), "");
60 static_assert(!(o2 > o4), "");
61 static_assert(!(o2 > o5), "");
62
63 static_assert((o3 > o1), "");
64 static_assert((o3 > o2), "");
65 static_assert(!(o3 > o3), "");
66 static_assert(!(o3 > o4), "");
67 static_assert(!(o3 > o5), "");
68
69 static_assert((o4 > o1), "");
70 static_assert((o4 > o2), "");
71 static_assert((o4 > o3), "");
72 static_assert(!(o4 > o4), "");
73 static_assert((o4 > o5), "");
74
75 static_assert((o5 > o1), "");
76 static_assert((o5 > o2), "");
77 static_assert(!(o5 > o3), "");
78 static_assert(!(o5 > o4), "");
79 static_assert(!(o5 > o5), "");
80 }
81 {
82 using O1 = optional<int>;
83 using O2 = optional<long>;
84 constexpr O1 o1(42);
85 static_assert(o1 > O2(1), "");
86 static_assert(!(O2(42) > o1), "");
87 }
88 {
89 using O1 = optional<int>;
90 using O2 = optional<const int>;
91 constexpr O1 o1(42);
92 static_assert(o1 > O2(1), "");
93 static_assert(!(O2(42) > o1), "");
94 }
95
96 return 0;
97}
98

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