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.
23static_assert(HasOperatorLessThanEqual<std::optional<ThreeWayComparable>, int>);
24static_assert(HasOperatorLessThanEqual<std::optional<ThreeWayComparable>, ThreeWayComparable>);
25
26static_assert(!HasOperatorLessThanEqual<std::optional<NonComparable>, NonComparable>);
27static_assert(!HasOperatorLessThanEqual<std::optional<ThreeWayComparable>, NonComparable>);
28static_assert(!HasOperatorLessThanEqual<std::optional<NonComparable>, ThreeWayComparable>);
29
30static_assert(HasOperatorLessThanEqual<int, std::optional<ThreeWayComparable>>);
31static_assert(HasOperatorLessThanEqual<ThreeWayComparable, std::optional<ThreeWayComparable>>);
32
33static_assert(!HasOperatorLessThanEqual<NonComparable, std::optional<NonComparable>>);
34static_assert(!HasOperatorLessThanEqual<NonComparable, std::optional<ThreeWayComparable>>);
35static_assert(!HasOperatorLessThanEqual<ThreeWayComparable, std::optional<NonComparable>>);
36
37#endif
38
39using std::optional;
40
41struct X {
42 int i_;
43
44 constexpr X(int i) : i_(i) {}
45};
46
47constexpr bool operator<=(const X& lhs, const X& rhs) {
48 return lhs.i_ <= rhs.i_;
49}
50
51int main(int, char**) {
52 {
53 typedef X T;
54 typedef optional<T> O;
55
56 constexpr T val(2);
57 constexpr O o1; // disengaged
58 constexpr O o2{1}; // engaged
59 constexpr O o3{val}; // engaged
60
61 static_assert((o1 <= T(1)), "");
62 static_assert((o2 <= T(1)), ""); // equal
63 static_assert(!(o3 <= T(1)), "");
64 static_assert((o2 <= val), "");
65 static_assert((o3 <= val), ""); // equal
66 static_assert((o3 <= T(3)), "");
67
68 static_assert(!(T(1) <= o1), "");
69 static_assert((T(1) <= o2), ""); // equal
70 static_assert((T(1) <= o3), "");
71 static_assert(!(val <= o2), "");
72 static_assert((val <= o3), ""); // equal
73 static_assert(!(T(3) <= o3), "");
74 }
75 {
76 using O = optional<int>;
77 constexpr O o1(42);
78 static_assert(o1 <= 42l, "");
79 static_assert(!(101l <= o1), "");
80 }
81 {
82 using O = optional<const int>;
83 constexpr O o1(42);
84 static_assert(o1 <= 42, "");
85 static_assert(!(101 <= o1), "");
86 }
87
88 return 0;
89}
90

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