| // Copyright 2020 The Chromium Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| // |
| // This file contains helpers for working with enums that require |
| // both enum->string and string->enum conversions. |
| |
| #ifndef UTIL_ENUM_NAME_TABLE_H_ |
| #define UTIL_ENUM_NAME_TABLE_H_ |
| |
| #include <array> |
| #include <utility> |
| |
| #include "absl/strings/string_view.h" |
| #include "platform/base/error.h" |
| #include "util/osp_logging.h" |
| |
| namespace openscreen { |
| |
| constexpr char kUnknownEnumError[] = "Enum value not in array"; |
| |
| // TODO(jophba): move to a proper class once we can inherit from array |
| // properly (in C++17). |
| template <typename Enum, size_t Size> |
| using EnumNameTable = std::array<std::pair<const char*, Enum>, Size>; |
| |
| // Get the name of an enum from the enum value. |
| template <typename Enum, size_t Size> |
| ErrorOr<const char*> GetEnumName(const EnumNameTable<Enum, Size>& map, |
| Enum enum_) { |
| for (auto pair : map) { |
| if (pair.second == enum_) { |
| return pair.first; |
| } |
| } |
| return Error(Error::Code::kParameterInvalid, kUnknownEnumError); |
| } |
| |
| // Get the value of an enum from the enum name. |
| template <typename Enum, size_t Size> |
| ErrorOr<Enum> GetEnum(const EnumNameTable<Enum, Size>& map, |
| absl::string_view name) { |
| for (auto pair : map) { |
| if (pair.first == name) { |
| return pair.second; |
| } |
| } |
| return Error(Error::Code::kParameterInvalid, kUnknownEnumError); |
| } |
| |
| } // namespace openscreen |
| #endif // UTIL_ENUM_NAME_TABLE_H_ |