34 lines · cpp
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-exception6//7//===----------------------------------------------------------------------===//8 9// UNSUPPORTED: c++03, c++11, c++14, c++17, c++2010 11// constexpr unexpected& operator=(const unexpected&) = default;12 13#include <cassert>14#include <expected>15 16struct Error {17 int i;18 constexpr Error(int ii) : i(ii) {}19};20 21constexpr bool test() {22 std::unexpected<Error> unex1(4);23 const std::unexpected<Error> unex2(5);24 unex1 = unex2;25 assert(unex1.error().i == 5);26 return true;27}28 29int main(int, char**) {30 test();31 static_assert(test());32 return 0;33}34