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00001 /* 00002 Crystal Space Reference Counting Interface 00003 Copyright (C) 2002 by Jorrit Tyberghein 00004 00005 This library is free software; you can redistribute it and/or 00006 modify it under the terms of the GNU Library General Public 00007 License as published by the Free Software Foundation; either 00008 version 2 of the License, or (at your option) any later version. 00009 00010 This library is distributed in the hope that it will be useful, 00011 but WITHOUT ANY WARRANTY; without even the implied warranty of 00012 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 00013 Library General Public License for more details. 00014 00015 You should have received a copy of the GNU Library General Public 00016 License along with this library; if not, write to the Free 00017 Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. 00018 */ 00019 00020 #ifndef __CS_REFCOUNT_H__ 00021 #define __CS_REFCOUNT_H__ 00022 00030 class csRefCount 00031 { 00032 protected: 00033 int ref_count; 00034 00035 // To avoid a problem with MSVC and multiple DLLs (with seperate memory 00036 // space) we have to use a virtual destructor. 00037 // @@@ Another alternative is to force this function to be non-inline, as 00038 // doing so will most likely achieve the same result. 00039 virtual void Delete () 00040 { 00041 delete this; 00042 } 00043 00044 virtual ~csRefCount () {} 00045 00046 public: 00048 csRefCount () : ref_count (1) {} 00049 00051 void IncRef () { ref_count++; } 00053 void DecRef () 00054 { 00055 ref_count--; 00056 if (ref_count <= 0) 00057 Delete (); 00058 } 00060 int GetRefCount () const { return ref_count; } 00061 }; 00062 00063 #endif // __CS_REFCOUNT_H__