| /* |
| * Copyright 2016 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 A_LOOKUP_H_ |
| |
| #define A_LOOKUP_H_ |
| |
| #include <utility> |
| #include <vector> |
| |
| namespace android { |
| |
| template<typename T, typename U> |
| struct ALookup { |
| ALookup(std::initializer_list<std::pair<T, U>> list); |
| |
| bool lookup(const T& from, U *to) const; |
| bool rlookup(const U& from, T *to) const; |
| |
| template<typename V, typename = typename std::enable_if<!std::is_same<T, V>::value>::type> |
| inline bool map(const T& from, V *to) const { return lookup(from, to); } |
| |
| template<typename V, typename = typename std::enable_if<!std::is_same<T, V>::value>::type> |
| inline bool map(const V& from, T *to) const { return rlookup(from, to); } |
| |
| private: |
| std::vector<std::pair<T, U>> mTable; |
| }; |
| |
| template<typename T, typename U> |
| ALookup<T, U>::ALookup(std::initializer_list<std::pair<T, U>> list) |
| : mTable(list) { |
| } |
| |
| template<typename T, typename U> |
| bool ALookup<T, U>::lookup(const T& from, U *to) const { |
| for (auto elem : mTable) { |
| if (elem.first == from) { |
| *to = elem.second; |
| return true; |
| } |
| } |
| return false; |
| } |
| |
| template<typename T, typename U> |
| bool ALookup<T, U>::rlookup(const U& from, T *to) const { |
| for (auto elem : mTable) { |
| if (elem.second == from) { |
| *to = elem.first; |
| return true; |
| } |
| } |
| return false; |
| } |
| |
| } // namespace android |
| |
| #endif // A_UTILS_H_ |