src/framework/Policies/SingletonImp.h

   1 /*
   2  * Copyright (C) 2005-2013 MaNGOS <http://getmangos.com/>
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License as published by
   6  * the Free Software Foundation; either version 2 of the License, or
   7  * (at your option) any later version.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program; if not, write to the Free Software
  16  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  17  */
  18
  19 #ifndef MANGOS_SINGLETONIMPL_H
  20 #define MANGOS_SINGLETONIMPL_H
  21
  22 #include "Singleton.h"
  23
  24 // avoid the using namespace here cuz
  25 // its a .h file afterall
  26
  27 template
  28 <
  29 typename T,
  30          class ThreadingModel,
  31          class CreatePolicy,
  32          class LifeTimePolicy
  33          >
  34 T& MaNGOS::Singleton<T, ThreadingModel, CreatePolicy, LifeTimePolicy>::Instance()
  35 {
  36     if (!si_instance)
  37     {
  38         // double-checked Locking pattern
  39         Guard();
  40
  41         if (!si_instance)
  42         {
  43             if (si_destroyed)
  44             {
  45                 si_destroyed = false;
  46                 LifeTimePolicy::OnDeadReference();
  47             }
  48
  49             si_instance = CreatePolicy::Create();
  50             LifeTimePolicy::ScheduleCall(&DestroySingleton);
  51         }
  52     }
  53
  54     return *si_instance;
  55 }
  56
  57 template
  58 <
  59 typename T,
  60          class ThreadingModel,
  61          class CreatePolicy,
  62          class LifeTimePolicy
  63          >
  64 void MaNGOS::Singleton<T, ThreadingModel, CreatePolicy, LifeTimePolicy>::DestroySingleton()
  65 {
  66     CreatePolicy::Destroy(si_instance);
  67     si_instance = NULL;
  68     si_destroyed = true;
  69 }
  70
  71 #define INSTANTIATE_SINGLETON_1(TYPE) \
  72     template class MANGOS_DLL_DECL MaNGOS::Singleton<TYPE, MaNGOS::SingleThreaded<TYPE>, MaNGOS::OperatorNew<TYPE>, MaNGOS::ObjectLifeTime<TYPE> >; \
  73     template<> TYPE* MaNGOS::Singleton<TYPE, MaNGOS::SingleThreaded<TYPE>, MaNGOS::OperatorNew<TYPE>, MaNGOS::ObjectLifeTime<TYPE> >::si_instance = 0; \
  74     template<> bool MaNGOS::Singleton<TYPE, MaNGOS::SingleThreaded<TYPE>, MaNGOS::OperatorNew<TYPE>, MaNGOS::ObjectLifeTime<TYPE> >::si_destroyed = false
  75
  76 #define INSTANTIATE_SINGLETON_2(TYPE, THREADINGMODEL) \
  77     template class MANGOS_DLL_DECL MaNGOS::Singleton<TYPE, THREADINGMODEL, MaNGOS::OperatorNew<TYPE>, MaNGOS::ObjectLifeTime<TYPE> >; \
  78     template<> TYPE* MaNGOS::Singleton<TYPE, THREADINGMODEL, MaNGOS::OperatorNew<TYPE>, MaNGOS::ObjectLifeTime<TYPE> >::si_instance = 0; \
  79     template<> bool MaNGOS::Singleton<TYPE, THREADINGMODEL, MaNGOS::OperatorNew<TYPE>, MaNGOS::ObjectLifeTime<TYPE> >::si_destroyed = false
  80
  81 #define INSTANTIATE_SINGLETON_3(TYPE, THREADINGMODEL, CREATIONPOLICY ) \
  82     template class MANGOS_DLL_DECL MaNGOS::Singleton<TYPE, THREADINGMODEL, CREATIONPOLICY, MaNGOS::ObjectLifeTime<TYPE> >; \
  83     template<> TYPE* MaNGOS::Singleton<TYPE, THREADINGMODEL, CREATIONPOLICY, MaNGOS::ObjectLifeTime<TYPE> >::si_instance = 0; \
  84     template<> bool MaNGOS::Singleton<TYPE, THREADINGMODEL, CREATIONPOLICY, MaNGOS::ObjectLifeType<TYPE> >::si_destroyed = false
  85
  86 #define INSTANTIATE_SINGLETON_4(TYPE, THREADINGMODEL, CREATIONPOLICY, OBJECTLIFETIME) \
  87     template class MANGOS_DLL_DECL MaNGOS::Singleton<TYPE, THREADINGMODEL, CREATIONPOLICY, OBJECTLIFETIME >; \
  88     template<> TYPE* MaNGOS::Singleton<TYPE, THREADINGMODEL, CREATIONPOLICY, OBJECTLIFETIME >::si_instance = 0; \
  89     template<> bool MaNGOS::Singleton<TYPE, THREADINGMODEL, CREATIONPOLICY, OBJECTLIFETIME >::si_destroyed = false
  90
  91 #endif