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_macros.h"
18
19using std::optional;
20
21struct X {
22 int i_;
23
24 constexpr X(int i) : i_(i) {}
25};
26
27constexpr bool operator<(const X& lhs, const X& rhs) { return lhs.i_ < rhs.i_; }
28
29int main(int, char**) {
30 {
31 typedef X T;
32 typedef optional<T> O;
33
34 constexpr T val(2);
35 constexpr O o1; // disengaged
36 constexpr O o2{1}; // engaged
37 constexpr O o3{val}; // engaged
38
39 static_assert((o1 < T(1)), "");
40 static_assert(!(o2 < T(1)), ""); // equal
41 static_assert(!(o3 < T(1)), "");
42 static_assert((o2 < val), "");
43 static_assert(!(o3 < val), ""); // equal
44 static_assert((o3 < T(3)), "");
45
46 static_assert(!(T(1) < o1), "");
47 static_assert(!(T(1) < o2), ""); // equal
48 static_assert((T(1) < o3), "");
49 static_assert(!(val < o2), "");
50 static_assert(!(val < o3), ""); // equal
51 static_assert(!(T(3) < o3), "");
52 }
53 {
54 using O = optional<int>;
55 constexpr O o1(42);
56 static_assert(o1 < 101l, "");
57 static_assert(!(42l < o1), "");
58 }
59 {
60 using O = optional<const int>;
61 constexpr O o1(42);
62 static_assert(o1 < 101, "");
63 static_assert(!(42 < o1), "");
64 }
65
66 return 0;
67}
68

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