78 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 void value() const &;12// constexpr void value() &&;13 14#include <cassert>15#include <concepts>16#include <expected>17#include <type_traits>18#include <utility>19 20#include "MoveOnly.h"21#include "test_macros.h"22 23constexpr bool test() {24 // const &25 {26 const std::expected<void, int> e;27 e.value();28 static_assert(std::is_same_v<decltype(e.value()), void>);29 }30 31 // &32 {33 std::expected<void, int> e;34 e.value();35 static_assert(std::is_same_v<decltype(e.value()), void>);36 }37 38 // &&39 {40 std::expected<void, int> e;41 std::move(e).value();42 static_assert(std::is_same_v<decltype(std::move(e).value()), void>);43 }44 45 // const &&46 {47 const std::expected<void, int> e;48 std::move(e).value();49 static_assert(std::is_same_v<decltype(std::move(e).value()), void>);50 }51 52 return true;53}54 55void testException() {56#ifndef TEST_HAS_NO_EXCEPTIONS57 58 // int59 {60 const std::expected<void, int> e(std::unexpect, 5);61 try {62 e.value();63 assert(false);64 } catch (const std::bad_expected_access<int>& ex) {65 assert(ex.error() == 5);66 }67 }68 69#endif // TEST_HAS_NO_EXCEPTIONS70}71 72int main(int, char**) {73 test();74 static_assert(test());75 testException();76 return 0;77}78