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
19 using std::optional;
20
21 struct X {
22 int i_;
23
XX24 constexpr X(int i) : i_(i) {}
25 };
26
operator ==(const X & lhs,const X & rhs)27 constexpr bool operator==(const X& lhs, const X& rhs) {
28 return lhs.i_ == rhs.i_;
29 }
30
main(int,char **)31 int 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