| /* |
| * Copyright (C) 2020 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| #ifndef ANDROIDFW_ERRORS_H_ |
| #define ANDROIDFW_ERRORS_H_ |
| |
| #include <optional> |
| #include <variant> |
| |
| #include <android-base/result.h> |
| |
| namespace android { |
| |
| enum class IOError { |
| // Used when reading a file residing on an IncFs file-system times out. |
| PAGES_MISSING = -1, |
| }; |
| |
| // Represents an absent result or an I/O error. |
| using NullOrIOError = std::variant<std::nullopt_t, IOError>; |
| |
| // Checks whether the result holds an unexpected I/O error. |
| template <typename T> |
| static inline bool IsIOError(const base::expected<T, NullOrIOError> result) { |
| return !result.has_value() && std::holds_alternative<IOError>(result.error()); |
| } |
| |
| static inline IOError GetIOError(const NullOrIOError& error) { |
| return std::get<IOError>(error); |
| } |
| |
| } // namespace android |
| |
| #endif //ANDROIDFW_ERRORS_H_ |