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67 lines
1.9 KiB
C++
67 lines
1.9 KiB
C++
/*
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common/singleton.h
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Copyright (c) 2018 chyyran
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Permission is hereby granted, free of charge, to any person obtaining a copy
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of this software and associated documentation files (the "Software"), to deal
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in the Software without restriction, including without limitation the rights
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to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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copies of the Software, and to permit persons to whom the Software is
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furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included in all
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copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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SOFTWARE.
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*/
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#pragma once
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#ifndef _SINGLETON_H_
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#define _SINGLETON_H_
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#include <cstdlib>
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#include <utility>
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#include <new> // std::nothrow
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template <typename T, typename... Args>
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class singleton
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{
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public:
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static inline T &instance(Args &&... args)
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{
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if (!_instance)
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make(std::forward<Args>(args)...);
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return *_instance;
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}
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private:
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static inline void make(Args... args)
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{
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if (!_instance)
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_instance = new (std::nothrow) T(std::forward<Args>(args)...);
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}
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static inline void reset()
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{
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if (_instance)
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{
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delete _instance;
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_instance = NULL;
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}
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}
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private:
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static T *_instance;
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};
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template<typename T, typename...Args>
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T * singleton<T, Args...>::_instance = NULL;
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#endif //_SINGLETON_H_
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