//===----------------------------------------------------------------------===//
//
// 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 E&& error() && noexcept;
#include <cassert>
#include <concepts>
#include <expected>
#include <utility>
template <class T>
concept ErrorNoexcept =
requires(T&& t) {
{ std::move(t).error() } noexcept;
};
static_assert(!ErrorNoexcept<int>);
static_assert(ErrorNoexcept<std::unexpected<int>>);
constexpr bool test() {
std::unexpected<int> unex(5);
decltype(auto) i = std::move(unex).error();
static_assert(std::same_as<decltype(i), int&&>);
assert(i == 5);
return true;
}
int main(int, char**) {
test();
static_assert(test());
return 0;
}