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# 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