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55 lines
1.6 KiB
55 lines
1.6 KiB
/**
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* Copyright 2020 Huawei Technologies Co., Ltd
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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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#ifndef GE_COMMON_SINGLETON_H_
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#define GE_COMMON_SINGLETON_H_
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#include <memory>
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#define DECLARE_SINGLETON_CLASS(T) friend class Singleton<T>
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namespace ge {
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static std::mutex single_mutex_;
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// Single thread version single instance template
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template <typename T>
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class Singleton {
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public:
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Singleton(Singleton const &) = delete;
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Singleton &operator=(Singleton const &) = delete;
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template <typename... _Args>
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static T *Instance(_Args... args) {
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std::lock_guard<std::mutex> lock(single_mutex_);
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if (instance_ == nullptr) {
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// std::nothrow, Nullptr returned when memory request failed
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instance_.reset(new (std::nothrow) T(args...));
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}
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return instance_.get();
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}
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static void Destroy(void) { instance_.reset(); }
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Singleton() = default;
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virtual ~Singleton() = default;
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private:
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static std::unique_ptr<T> instance_;
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};
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template <typename T>
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std::unique_ptr<T> Singleton<T>::instance_;
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} // namespace ge
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#endif // GE_COMMON_SINGLETON_H_
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