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refcount.h

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__

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