| // Copyright 2021 The Chromium Authors |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #ifndef BASE_FILES_FILE_ERROR_OR_H_ |
| #define BASE_FILES_FILE_ERROR_OR_H_ |
| |
| #include "base/files/file.h" |
| #include "base/types/expected.h" |
| |
| namespace base { |
| |
| // Helper for methods which perform file system operations and which may fail. |
| // Objects of this type can take on EITHER a base::File::Error value OR a result |
| // value of the specified type. For example: |
| // |
| // base::FileErrorOr<int64_t> GetSize() { |
| // if (failed_to_get_size) |
| // return base::unexpected(base::File::Error::FILE_ERROR_FAILED); |
| // |
| // return size; |
| // } |
| // |
| template <class ValueType> |
| using FileErrorOr = expected<ValueType, File::Error>; |
| |
| } // namespace base |
| |
| #endif // BASE_FILES_FILE_ERROR_OR_H_ |
