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) {
28 return lhs.i_ == rhs.i_;
29}
30
31int main(int, char**) {
32 {
33 typedef X T;
34 typedef optional<T> O;
35
36 constexpr T val(2);
37 constexpr O o1; // disengaged
38 constexpr O o2{1}; // engaged
39 constexpr O o3{val}; // engaged
40
41 static_assert(!(o1 == T(1)), "");
42 static_assert((o2 == T(1)), "");
43 static_assert(!(o3 == T(1)), "");
44 static_assert((o3 == T(2)), "");
45 static_assert((o3 == val), "");
46
47 static_assert(!(T(1) == o1), "");
48 static_assert((T(1) == o2), "");
49 static_assert(!(T(1) == o3), "");
50 static_assert((T(2) == o3), "");
51 static_assert((val == o3), "");
52 }
53 {
54 using O = optional<int>;
55 constexpr O o1(42);
56 static_assert(o1 == 42l, "");
57 static_assert(!(101l == o1), "");
58 }
59 {
60 using O = optional<const int>;
61 constexpr O o1(42);
62 static_assert(o1 == 42, "");
63 static_assert(!(101 == o1), "");
64 }
65
66 return 0;
67}
68

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