mirror of
https://github.com/Icinga/icinga2.git
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59 lines
1.9 KiB
C++
59 lines
1.9 KiB
C++
/******************************************************************************
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* Icinga 2 *
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* Copyright (C) 2012-2017 Icinga Development Team (https://www.icinga.com/) *
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* *
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* This program is free software; you can redistribute it and/or *
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* modify it under the terms of the GNU General Public License *
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* as published by the Free Software Foundation; either version 2 *
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* of the License, or (at your option) any later version. *
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* *
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* This program 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 General Public License for more details. *
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* *
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* You should have received a copy of the GNU General Public License *
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* along with this program; if not, write to the Free Software Foundation *
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA. *
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******************************************************************************/
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#ifndef SINGLETON_H
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#define SINGLETON_H
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#include "base/i2-base.hpp"
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#include <boost/thread/mutex.hpp>
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namespace icinga
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{
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/**
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* A singleton.
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*
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* @ingroup base
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*/
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template<typename T>
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class Singleton
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{
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public:
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static T *GetInstance(void)
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{
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/* FIXME: This relies on static initializers being atomic. */
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static boost::mutex mutex;
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boost::mutex::scoped_lock lock(mutex);
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static T *instance;
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if (!instance)
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instance = new T();
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return instance;
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}
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private:
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static T *m_Instance;
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};
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}
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#endif /* SINGLETON_H */
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