6a54dfbfe5
Also standardize the license comment in several files where it was different from what we normally do.
115 lines
2.6 KiB
C++
115 lines
2.6 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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// constexpr const T& value() const &;
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// constexpr T& value() &;
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// constexpr T&& value() &&;
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// constexpr const T&& value() const &&;
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#include <cassert>
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#include <concepts>
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#include <expected>
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#include <type_traits>
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#include <utility>
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#include "test_macros.h"
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constexpr bool test() {
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// non-const &
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{
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std::expected<int, int> e(5);
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decltype(auto) x = e.value();
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static_assert(std::same_as<decltype(x), int&>);
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assert(&x == &(*e));
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assert(x == 5);
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}
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// const &
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{
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const std::expected<int, int> e(5);
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decltype(auto) x = e.value();
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static_assert(std::same_as<decltype(x), const int&>);
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assert(&x == &(*e));
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assert(x == 5);
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}
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// non-const &&
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{
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std::expected<int, int> e(5);
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decltype(auto) x = std::move(e).value();
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static_assert(std::same_as<decltype(x), int&&>);
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assert(&x == &(*e));
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assert(x == 5);
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}
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// const &&
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{
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const std::expected<int, int> e(5);
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decltype(auto) x = std::move(e).value();
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static_assert(std::same_as<decltype(x), const int&&>);
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assert(&x == &(*e));
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assert(x == 5);
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}
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return true;
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}
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void testException() {
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#ifndef TEST_HAS_NO_EXCEPTIONS
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// int
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{
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const std::expected<int, int> e(std::unexpect, 5);
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try {
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(void) e.value();
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assert(false);
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} catch (const std::bad_expected_access<int>& ex) {
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assert(ex.error() == 5);
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}
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}
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#endif // TEST_HAS_NO_EXCEPTIONS
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}
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void testAsConst() {
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#ifndef TEST_HAS_NO_EXCEPTIONS
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struct Error {
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enum { Default, MutableRefCalled, ConstRefCalled } From = Default;
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Error() = default;
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Error(const Error&) { From = ConstRefCalled; }
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Error(Error&) { From = MutableRefCalled; }
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Error(Error&& e) { From = e.From; }
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};
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// Test & overload
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{
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std::expected<int, Error> e(std::unexpect, Error());
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try {
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(void)e.value();
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assert(false);
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} catch (const std::bad_expected_access<Error>& ex) {
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assert(ex.error().From == Error::ConstRefCalled);
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}
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}
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// There are no effects for `const &` overload.
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#endif // TEST_HAS_NO_EXCEPTIONS
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}
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int main(int, char**) {
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test();
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static_assert(test());
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testException();
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testAsConst();
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return 0;
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}
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