declSmartPtr.h

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/*********************************************************************
** Copyright (c) 1997 MaK Technologies, Inc.
** All rights reserved.
*********************************************************************/
/*********************************************************************
** $RCSfile: declSmartPtr.h,v $ $Revision: 1.1 $ $State: Exp $
*********************************************************************/


//

#include "vlObserver.h"

#define DtDECLARE_DEFINE_SMART_PTR(ClassName) \
class DT_DLL_VLUTIL ClassName##Ptr : public DtObserver                \
{                                                       \
public:                                                 \
                                                        \
   ClassName##Ptr(ClassName* pointedAt);                \
                                                        \
   virtual ~ClassName##Ptr();                           \
                                                        \
   ClassName##Ptr(const ClassName##Ptr& orig);          \
                                                        \
   ClassName##Ptr& operator=(const ClassName##Ptr& orig); \
                                                        \
   bool stillGood() const;                         \
                                                        \
   bool operator!() const;                         \
                                                        \
   ClassName* operator->() const;                       \
                                                        \
   operator ClassName*() const;                         \
                                                        \
protected:                                              \
                                                        \
   virtual bool startObserving(DtObservee* toObserve); \
                                                        \
   virtual bool stopObserving(DtObservee* observed); \
                                                        \
};                                                      \
                                                        \
ClassName##Ptr::ClassName##Ptr(ClassName* pointedAt) :  \
   DtObserver()                                         \
{                                                       \
   internalStartObserving(pointedAt);                   \
}                                                       \
                                                        \
ClassName##Ptr::~ClassName##Ptr()                       \
{                                                       \
}                                                       \
                                                        \
ClassName##Ptr::ClassName##Ptr(const ClassName##Ptr& orig) : \
   DtObserver(orig)                                     \
{                                                       \
}                                                       \
                                                        \
ClassName##Ptr& ClassName##Ptr::operator=(const ClassName##Ptr& orig) \
{                                                       \
   if (this == &orig)                                   \
   {                                                    \
      return *this;                                     \
   }                                                    \
                                                        \
   DtObserver::operator=(orig);                         \
                                                        \
   return *this;                                        \
}                                                       \
                                                        \
bool ClassName##Ptr::startObserving(DtObservee* toObserve) \
{                                                       \
   return DtObserver::startObserving(toObserve);        \
}                                                       \
                                                        \
bool ClassName##Ptr::stopObserving(DtObservee* toObserve) \
{                                                       \
   return DtObserver::stopObserving(toObserve);         \
}                                                       \
                                                        \
bool ClassName##Ptr::stillGood() const             \
{                                                       \
   return operator->() ? true : false;              \
}                                                       \
                                                        \
bool ClassName##Ptr::operator!() const             \
{                                                       \
   return !operator->() ? true : false;             \
}                                                       \
                                                        \
ClassName* ClassName##Ptr::operator->() const           \
{                                                       \
   DtListItem* item = myObjectsAmObserving.first();     \
   if (!item)                                           \
   {                                                    \
      return NULL;                                      \
   }                                                    \
   return (ClassName*)item->data();                     \
}                                                       \
                                                        \
ClassName##Ptr::operator ClassName*() const             \
{                                                       \
   return operator->();                                 \
}                                                       \