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// 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

source code of libcxx/test/std/utilities/expected/expected.unexpected/assign/assign.move.pass.cpp