simpleListItem.h

Go to the documentation of this file.

/*********************************************************************
** Copyright (c) 1999 MaK Technologies, Inc.
** All rights reserved.
*********************************************************************/
/*********************************************************************
** $RCSfile: slLstItm.h,v $ $Revision: 1.5 $ $State: Exp $
*********************************************************************/

#ifndef simpleListItem_H_
#define simpleListItem_H_

#include "gdb/gdbDefines.h"

// class DtSimpleListItem:
//
// Instances of DtSimpleListItem are used by the DtSimpleList, a singly-linked 
// list implementation, to store the items.
// @note The class has no virtual functions on purpose to reduce the size
// of the items as DtGroups use DtSimpleLists to hold their children, which
// means at least one DtSimpleListItem for every polygon and other node in the 
// scene, which adds up for large scenes.
//
class DT_DLL_gdb DtSimpleListItem
{
   friend class DtSimpleList;
   
public:
   // destructor
   ~DtSimpleListItem();

   // accessor
   DtSimpleListItem* next();

   void* data(); 

protected:
   // constructor
   DtSimpleListItem(void* d); 

   // If a copy constructor is implemented, the assignment operator should
   // also be implemented.  Should generally implement both of them anyway to
   // avoid memory problems due to inappropriate compiler provided defaults.
   // Access varies so need to put proper access keyword above these 
   // declarations.
   // copy constructor
   DtSimpleListItem(const DtSimpleListItem& orig);

   // assignment operator
   DtSimpleListItem& operator=(const DtSimpleListItem& orig);


protected:
   DtSimpleListItem* myNext;
   void*             myData;
};

inline void* DtSimpleListItem::data()
{ 
   return myData; 
}

inline DtSimpleListItem::DtSimpleListItem(void* d): 
   myNext(0), 
   myData(d) 
{  
}

// accessor
inline DtSimpleListItem* DtSimpleListItem::next() 
{  
   return myNext; 
}

#endif