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, c++17, c++20 |
10 | |
11 | // template<class E2> |
12 | // friend constexpr bool operator==(const unexpected& x, const unexpected<E2>& y); |
13 | // |
14 | // Mandates: The expression x.error() == y.error() is well-formed and its result is convertible to bool. |
15 | // |
16 | // Returns: x.error() == y.error(). |
17 | |
18 | #include <cassert> |
19 | #include <concepts> |
20 | #include <expected> |
21 | #include <utility> |
22 | |
23 | struct Error { |
24 | int i; |
25 | friend constexpr bool operator==(const Error&, const Error&) = default; |
26 | friend constexpr bool operator==(const Error& lhs, int rhs) noexcept { return lhs.i == rhs; } |
27 | }; |
28 | |
29 | constexpr bool test() { |
30 | std::unexpected<Error> unex1(Error{2}); |
31 | std::unexpected<Error> unex2(Error{3}); |
32 | std::unexpected<Error> unex3(Error{2}); |
33 | |
34 | assert(unex1 == unex3); |
35 | assert(unex1 != unex2); |
36 | assert(unex2 != unex3); |
37 | |
38 | std::unexpected<int> unex_i1(1); |
39 | std::unexpected<int> unex_i2(2); |
40 | |
41 | assert(unex1 != unex_i1); |
42 | assert(unex_i1 != unex1); |
43 | assert(unex1 == unex_i2); |
44 | assert(unex_i2 == unex1); |
45 | |
46 | return true; |
47 | } |
48 | |
49 | int main(int, char**) { |
50 | test(); |
51 | static_assert(test()); |
52 | return 0; |
53 | } |
54 | |