DtVirtualBaseClass.h

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/****************************************************************************** 
** Copyright (c) 2007 MAK Technologies, Inc. 
** All rights reserved. 
******************************************************************************/ 
/****************************************************************************** 
** $RCSfile: DtVirtualBaseClass.h,v $ $Revision: 1.8 $ $State: Exp $ 
******************************************************************************/ 
 
 
#pragma once
 
#include <vrvUtil/vrvUtil.h> 
 
namespace makVrv 
{ 
   class DT_DLL_VRVUTIL DtVirtualBaseClass 
   { 

   public:

      DtVirtualBaseClass();

      virtual ~DtVirtualBaseClass();

   };

   template <typename T>   
   class DtInstanceHolder : public DtVirtualBaseClass
   {
   public:
      DtInstanceHolder(T* ptr) : myPointer(ptr)
      {
      }

      virtual ~DtInstanceHolder()
      {
         delete myPointer;
         myPointer = 0;
      }

      T* get()
      {
         return myPointer;
      }

      T* myPointer;
   };

   template <typename T>   
   class DtWeakInstanceHolder : public DtVirtualBaseClass
   {
   public:
      DtWeakInstanceHolder(T* ptr) : myPointer(ptr)
      {
      }

      virtual ~DtWeakInstanceHolder()
      {
         // do not delete
         myPointer = 0;
      }

      T* get()
      {
         return myPointer;
      }

      T* myPointer;
   };
}