6a54dfbfe5
Also standardize the license comment in several files where it was different from what we normally do.
71 lines
1.8 KiB
C++
71 lines
1.8 KiB
C++
//===----------------------------------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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// UNSUPPORTED: c++03, c++11, c++14, c++17, c++20
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// E& error() & noexcept;
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// const E& error() const & noexcept;
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// E&& error() && noexcept;
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// const E&& error() const && noexcept;
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#include <cassert>
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#include <concepts>
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#include <expected>
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#include <utility>
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template <class T>
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concept ErrorNoexcept =
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requires(T&& t) {
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{ std::forward<T>(t).error() } noexcept;
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};
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static_assert(!ErrorNoexcept<int>);
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static_assert(ErrorNoexcept<std::bad_expected_access<int>&>);
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static_assert(ErrorNoexcept<std::bad_expected_access<int> const&>);
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static_assert(ErrorNoexcept<std::bad_expected_access<int>&&>);
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static_assert(ErrorNoexcept<std::bad_expected_access<int> const&&>);
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void test() {
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// &
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{
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std::bad_expected_access<int> e(5);
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decltype(auto) i = e.error();
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static_assert(std::same_as<decltype(i), int&>);
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assert(i == 5);
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}
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// const &
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{
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const std::bad_expected_access<int> e(5);
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decltype(auto) i = e.error();
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static_assert(std::same_as<decltype(i), const int&>);
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assert(i == 5);
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}
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// &&
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{
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std::bad_expected_access<int> e(5);
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decltype(auto) i = std::move(e).error();
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static_assert(std::same_as<decltype(i), int&&>);
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assert(i == 5);
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}
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// const &&
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{
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const std::bad_expected_access<int> e(5);
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decltype(auto) i = std::move(e).error();
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static_assert(std::same_as<decltype(i), const int&&>);
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assert(i == 5);
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}
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}
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int main(int, char**) {
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test();
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return 0;
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}
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