| /* |
| * Copyright (C) 2017 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. |
| */ |
| |
| #pragma once |
| |
| #include <atomic> |
| #include <limits> |
| |
| namespace android { |
| |
| template<typename T> |
| class HandleGenerator { |
| protected: |
| static T getNextHandle(); |
| }; |
| |
| template<typename T> |
| T HandleGenerator<T>::getNextHandle() { |
| static std::atomic<uint32_t> mNextUniqueId(1); |
| uint32_t id = mNextUniqueId++; |
| while (id > std::numeric_limits<T>::max()) { |
| id -= std::numeric_limits<T>::max(); |
| } |
| return static_cast<T>(id); |
| } |
| |
| } // namespace android |
