CrystalSpace

Public API Reference

csutil/refcount.h

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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 
00027 #include "csextern.h"
00028 #include "csutil/reftrackeraccess.h"
00029 
00037 class csRefCount
00038 {
00039 protected:
00040   int ref_count;
00041 
00042   // To avoid a problem with MSVC and multiple DLLs (with separate memory
00043   // space) we have to use a virtual destructor.
00044   // @@@ Another alternative is to force this function to be non-inline, as
00045   // doing so will most likely achieve the same result.
00046   virtual void Delete ()
00047   {
00048     delete this;
00049   }
00050 
00051   virtual ~csRefCount () 
00052   {
00053     csRefTrackerAccess::TrackDestruction (this, ref_count);
00054   }
00055 
00056 public:
00058   csRefCount () : ref_count (1) 
00059   {
00060     csRefTrackerAccess::TrackConstruction (this);
00061   }
00062 
00064   void IncRef () 
00065   { 
00066     csRefTrackerAccess::TrackIncRef (this, ref_count); 
00067     ref_count++; 
00068   }
00070   void DecRef ()
00071   {
00072     csRefTrackerAccess::TrackDecRef (this, ref_count);
00073     ref_count--;
00074     if (ref_count <= 0)
00075       Delete ();
00076   }
00078   int GetRefCount () const { return ref_count; }
00079 };
00080 
00081 #endif // __CS_REFCOUNT_H__
00082 

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