41 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=(unexpected&&) = default;12 13#include <cassert>14#include <expected>15#include <utility>16 17struct Error {18 int i;19 constexpr Error(int ii) : i(ii) {}20 constexpr Error& operator=(Error&& other) {21 i = other.i;22 other.i = 0;23 return *this;24 }25};26 27constexpr bool test() {28 std::unexpected<Error> unex1(4);29 std::unexpected<Error> unex2(5);30 unex1 = std::move(unex2);31 assert(unex1.error().i == 5);32 assert(unex2.error().i == 0);33 return true;34}35 36int main(int, char**) {37 test();38 static_assert(test());39 return 0;40}41