| //===----------------------------------------------------------------------===// |
| // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
| // See https://llvm.org/LICENSE.txt for license information. |
| // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
| // |
| //===----------------------------------------------------------------------===// |
| |
| // UNSUPPORTED: c++03, c++11, c++14, c++17, c++20 |
| |
| // constexpr unexpected& operator=(const unexpected&) = default; |
| |
| #include <cassert> |
| #include <expected> |
| |
| struct Error { |
| int i; |
| constexpr Error(int ii) : i(ii) {} |
| }; |
| |
| constexpr bool test() { |
| std::unexpected<Error> unex1(4); |
| const std::unexpected<Error> unex2(5); |
| unex1 = unex2; |
| assert(unex1.error().i == 5); |
| return true; |
| } |
| |
| int main(int, char**) { |
| test(); |
| static_assert(test()); |
| return 0; |
| } |