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Singleton.h
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Singleton.h
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/*
* This file is part of the CMaNGOS Project. See AUTHORS file for Copyright information
*
* 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#ifndef MANGOS_SINGLETON_H
#define MANGOS_SINGLETON_H
/**
* @brief class Singleton
*/
#include "CreationPolicy.h"
#include "ThreadingModel.h"
#include "ObjectLifeTime.h"
namespace MaNGOS
{
template
<
typename T,
class ThreadingModel = MaNGOS::SingleThreaded<T>,
class CreatePolicy = MaNGOS::OperatorNew<T>,
class LifeTimePolicy = MaNGOS::ObjectLifeTime<T>
>
class Singleton
{
public:
static T& Instance();
protected:
Singleton()
{
}
private:
// Prohibited actions...this does not prevent hijacking.
Singleton(const Singleton&);
Singleton& operator=(const Singleton&);
// Singleton Helpers
static void DestroySingleton();
// data structure
typedef typename ThreadingModel::Lock Guard;
static T* si_instance;
static bool si_destroyed;
};
template<typename T, class ThreadingModel, class CreatePolicy, class LifeTimePolicy>
T* Singleton<T, ThreadingModel, CreatePolicy, LifeTimePolicy>::si_instance = NULL;
template<typename T, class ThreadingModel, class CreatePolicy, class LifeTimePolicy>
bool Singleton<T, ThreadingModel, CreatePolicy, LifeTimePolicy>::si_destroyed = false;
template<typename T, class ThreadingModel, class CreatePolicy, class LifeTimePolicy>
T& MaNGOS::Singleton<T, ThreadingModel, CreatePolicy, LifeTimePolicy>::Instance()
{
if (!si_instance)
{
// double-checked Locking pattern
Guard();
if (!si_instance)
{
if (si_destroyed)
{
si_destroyed = false;
LifeTimePolicy::OnDeadReference();
}
si_instance = CreatePolicy::Create();
LifeTimePolicy::ScheduleCall(&DestroySingleton);
}
}
return *si_instance;
}
template<typename T, class ThreadingModel, class CreatePolicy, class LifeTimePolicy>
void MaNGOS::Singleton<T, ThreadingModel, CreatePolicy, LifeTimePolicy>::DestroySingleton()
{
CreatePolicy::Destroy(si_instance);
si_instance = NULL;
si_destroyed = true;
}
}
#define INSTANTIATE_SINGLETON_1(TYPE) \
template class MaNGOS::Singleton<TYPE, MaNGOS::SingleThreaded<TYPE>, MaNGOS::OperatorNew<TYPE>, MaNGOS::ObjectLifeTime<TYPE> >;
#define INSTANTIATE_SINGLETON_2(TYPE, THREADINGMODEL) \
template class MaNGOS::Singleton<TYPE, THREADINGMODEL, MaNGOS::OperatorNew<TYPE>, MaNGOS::ObjectLifeTime<TYPE> >;
#define INSTANTIATE_SINGLETON_3(TYPE, THREADINGMODEL, CREATIONPOLICY ) \
template class MaNGOS::Singleton<TYPE, THREADINGMODEL, CREATIONPOLICY, MaNGOS::ObjectLifeTime<TYPE> >;
#define INSTANTIATE_SINGLETON_4(TYPE, THREADINGMODEL, CREATIONPOLICY, OBJECTLIFETIME) \
template class MaNGOS::Singleton<TYPE, THREADINGMODEL, CREATIONPOLICY, OBJECTLIFETIME >;
#endif