mirror of https://github.com/Icinga/icinga2.git
59 lines
1.9 KiB
C++
59 lines
1.9 KiB
C++
/******************************************************************************
|
|
* Icinga 2 *
|
|
* Copyright (C) 2012-2017 Icinga Development Team (https://www.icinga.com/) *
|
|
* *
|
|
* This program is free software; you can redistribute it and/or *
|
|
* modify it under the terms of the GNU General Public License *
|
|
* as published by the Free Software Foundation; either version 2 *
|
|
* of the License, or (at your option) any later version. *
|
|
* *
|
|
* This program is distributed in the hope that it will be useful, *
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of *
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
|
|
* GNU General Public License for more details. *
|
|
* *
|
|
* You should have received a copy of the GNU General Public License *
|
|
* along with this program; if not, write to the Free Software Foundation *
|
|
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA. *
|
|
******************************************************************************/
|
|
|
|
#ifndef SINGLETON_H
|
|
#define SINGLETON_H
|
|
|
|
#include "base/i2-base.hpp"
|
|
#include <boost/thread/mutex.hpp>
|
|
|
|
namespace icinga
|
|
{
|
|
|
|
/**
|
|
* A singleton.
|
|
*
|
|
* @ingroup base
|
|
*/
|
|
template<typename T>
|
|
class Singleton
|
|
{
|
|
public:
|
|
static T *GetInstance(void)
|
|
{
|
|
/* FIXME: This relies on static initializers being atomic. */
|
|
static boost::mutex mutex;
|
|
boost::mutex::scoped_lock lock(mutex);
|
|
|
|
static T *instance;
|
|
|
|
if (!instance)
|
|
instance = new T();
|
|
|
|
return instance;
|
|
}
|
|
|
|
private:
|
|
static T *m_Instance;
|
|
};
|
|
|
|
}
|
|
|
|
#endif /* SINGLETON_H */
|