TRefCnt.h

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// @(#)root/base:$Id$
// Author: Fons Rademakers   04/08/95

/*************************************************************************
 * Copyright (C) 1995-2000, Rene Brun and Fons Rademakers.               *
 * All rights reserved.                                                  *
 *                                                                       *
 * For the licensing terms see $ROOTSYS/LICENSE.                         *
 * For the list of contributors see $ROOTSYS/README/CREDITS.             *
 *************************************************************************/

#ifndef ROOT_TRefCnt
#define ROOT_TRefCnt


//////////////////////////////////////////////////////////////////////////
//                                                                      //
//  TRefCnt                                                             //
//                                                                      //
//  Base class for reference counted objects.                           //
//                                                                      //
//////////////////////////////////////////////////////////////////////////

#include "Rtypes.h"


class TRefCnt {

protected:
   UInt_t  fRefs;      // (1 less than) number of references

public:
   enum EReferenceFlag { kStaticInit };

   TRefCnt(Int_t initRef = 0) : fRefs((UInt_t)initRef-1) { }
   TRefCnt(EReferenceFlag);
   virtual ~TRefCnt() { }
   UInt_t   References() const      { return fRefs+1; }
   void     SetRefCount(UInt_t r)   { fRefs = r-1; }
   void     AddReference()          { fRefs++; }
   UInt_t   RemoveReference()       { return fRefs--; }
};

#endif