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(HasOperatorLessThanEqual<std::optional<ThreeWayComparable>>);
23static_assert(HasOperatorLessThanEqual<std::optional<ThreeWayComparable>, std::optional<int>>);
24
25static_assert(!HasOperatorLessThanEqual<std::optional<NonComparable>>);
26static_assert(!HasOperatorLessThanEqual<std::optional<EqualityComparable>>);
27static_assert(!HasOperatorLessThanEqual<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) {
40 return lhs.i_ <= rhs.i_;
41}
42
43int main(int, char**) {
44 {
45 typedef optional<X> O;
46
47 constexpr O o1; // disengaged
48 constexpr O o2; // disengaged
49 constexpr O o3{1}; // engaged
50 constexpr O o4{2}; // engaged
51 constexpr O o5{1}; // engaged
52
53 static_assert((o1 <= o1), "");
54 static_assert((o1 <= o2), "");
55 static_assert((o1 <= o3), "");
56 static_assert((o1 <= o4), "");
57 static_assert((o1 <= o5), "");
58
59 static_assert((o2 <= o1), "");
60 static_assert((o2 <= o2), "");
61 static_assert((o2 <= o3), "");
62 static_assert((o2 <= o4), "");
63 static_assert((o2 <= o5), "");
64
65 static_assert(!(o3 <= o1), "");
66 static_assert(!(o3 <= o2), "");
67 static_assert((o3 <= o3), "");
68 static_assert((o3 <= o4), "");
69 static_assert((o3 <= o5), "");
70
71 static_assert(!(o4 <= o1), "");
72 static_assert(!(o4 <= o2), "");
73 static_assert(!(o4 <= o3), "");
74 static_assert((o4 <= o4), "");
75 static_assert(!(o4 <= o5), "");
76
77 static_assert(!(o5 <= o1), "");
78 static_assert(!(o5 <= o2), "");
79 static_assert((o5 <= o3), "");
80 static_assert((o5 <= o4), "");
81 static_assert((o5 <= o5), "");
82 }
83 {
84 using O1 = optional<int>;
85 using O2 = optional<long>;
86 constexpr O1 o1(42);
87 static_assert(o1 <= O2(42), "");
88 static_assert(!(O2(101) <= o1), "");
89 }
90 {
91 using O1 = optional<int>;
92 using O2 = optional<const int>;
93 constexpr O1 o1(42);
94 static_assert(o1 <= O2(42), "");
95 static_assert(!(O2(101) <= o1), "");
96 }
97
98 return 0;
99}
100

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