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56 lines
1.6 KiB
C++
56 lines
1.6 KiB
C++
/**
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* Copyright 2013-2021 Software Radio Systems Limited
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*
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* This file is part of srsLTE.
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*
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* srsLTE is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License as
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* published by the Free Software Foundation, either version 3 of
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* the License, or (at your option) any later version.
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*
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* srsLTE is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Affero General Public License for more details.
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*
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* A copy of the GNU Affero General Public License can be found in
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* the LICENSE file in the top-level directory of this distribution
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* and at http://www.gnu.org/licenses/.
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*
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*/
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#ifndef SRSLTE_SINGLETON_H
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#define SRSLTE_SINGLETON_H
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#include <memory>
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// CRTP pattern to create class singletons
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template <typename T>
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class singleton_t
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{
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public:
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singleton_t(const singleton_t<T>&) = delete;
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singleton_t(singleton_t<T>&&) = delete;
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singleton_t& operator=(const singleton_t<T>&) = delete;
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singleton_t& operator=(singleton_t<T>&&) = delete;
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static T* get_instance()
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{
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// this variable initialization is thread-safe since C++11
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// instance dtor is called on program exit
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static std::unique_ptr<T> instance{new T_instance{}};
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return instance.get();
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}
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protected:
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singleton_t() = default;
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private:
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// this class makes the protected T::T() accessible to the singleton
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struct T_instance : public T {
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T_instance() : T() {}
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};
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};
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#endif // SRSLTE_SINGLETON_H
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