41 lines
1.1 KiB
C++
41 lines
1.1 KiB
C++
/*
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* Copyright (C) 2017 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#pragma once
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#include <atomic>
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#include <limits>
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namespace android {
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template<typename T>
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class HandleGenerator {
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protected:
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static T getNextHandle();
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};
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template<typename T>
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T HandleGenerator<T>::getNextHandle() {
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static std::atomic<uint32_t> mNextUniqueId(1);
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uint32_t id = mNextUniqueId++;
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while (id > std::numeric_limits<T>::max()) {
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id -= std::numeric_limits<T>::max();
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}
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return static_cast<T>(id);
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}
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} // namespace android
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