src/framework/Policies/CreationPolicy.h

   1 /*
   2  * Copyright (C) 2005-2009 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_CREATIONPOLICY_H
  20 #define MANGOS_CREATIONPOLICY_H
  21
  22 #include <stdlib.h>
  23 #include "Platform/Define.h"
  24
  25 namespace MaNGOS
  26 {
  27     /**
  28      * OperatorNew policy creates an object on the heap using new.
  29      */
  30     template <class T>
  31         class MANGOS_DLL_DECL OperatorNew
  32     {
  33         public:
  34             static T* Create(void) { return (new T); }
  35             static void Destroy(T *obj) { delete obj; }
  36     };
  37
  38     /**
  39      * LocalStaticCreation policy creates an object on the stack
  40      * the first time call Create.
  41      */
  42     template <class T>
  43         class MANGOS_DLL_DECL LocalStaticCreation
  44     {
  45         union MaxAlign
  46         {
  47             char t_[sizeof(T)];
  48             short int shortInt_;
  49             int int_;
  50             long int longInt_;
  51             float float_;
  52             double double_;
  53             long double longDouble_;
  54             struct Test;
  55             int Test::* pMember_;
  56             int (Test::*pMemberFn_)(int);
  57         };
  58         public:
  59             static T* Create(void)
  60             {
  61                 static MaxAlign si_localStatic;
  62                 return new(&si_localStatic) T;
  63             }
  64
  65             static void Destroy(T *obj) { obj->~T(); }
  66     };
  67
  68     /**
  69      * CreateUsingMalloc by pass the memory manger.
  70      */
  71     template<class T>
  72         class MANGOS_DLL_DECL CreateUsingMalloc
  73     {
  74         public:
  75             static T* Create()
  76             {
  77                 void* p = ::malloc(sizeof(T));
  78                 if (!p) return 0;
  79                 return new(p) T;
  80             }
  81
  82             static void Destroy(T* p)
  83             {
  84                 p->~T();
  85                 ::free(p);
  86             }
  87     };
  88
  89     /**
  90      * CreateOnCallBack creates the object base on the call back.
  91      */
  92     template<class T, class CALL_BACK>
  93         class MANGOS_DLL_DECL CreateOnCallBack
  94     {
  95         public:
  96             static T* Create()
  97             {
  98                 return CALL_BACK::createCallBack();
  99             }
 100
 101             static void Destroy(T *p)
 102             {
 103                 CALL_BACK::destroyCallBack(p);
 104             }
 105     };
 106 }
 107 #endif