delmon.h

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/* Copyright (C) 2004-2005 Darrell Karbott ([e-mail])
** This code is free software; you can redistribute it and/or
** modify it under the terms of GNU Lesser General Public License.
** See http://www.gnu.org/ for further details of the LGPL.
**/

#ifndef __DELMON_H__
#define __DELMON_H__ 1

#include <e32base.h>

/*
** Helper classes used to keep track of when a class instance has been
** deleted from inside its own notification callback. (e.g. CSocket
** from MSocketObserver::SocketNotify()).
**
** The class that might be unexpectedly deleted has a CNotifyOnDelete
** member.
**
** The code that calls the client notification callback creates a
** TDeletionMonitor instance on the stack before calling the callback.
** It can then check TDeletionMonitor::WasDeleted() to see if the code
** in the callback deleted the monitored object.
**
** REQUIRES: No code within the scope of the TDeletionMonitor leaves.  
*/

class CNotifyOnDelete : public CBase {
public:
  CNotifyOnDelete();

  void MarkDeleted();
  virtual ~CNotifyOnDelete();
 protected:
  TBool* SetObserver(TBool* flagToSet); 
private:
  TBool* iDeleted;
  friend class TDeletionMonitor;
};

class TDeletionMonitor
{
public:
  TDeletionMonitor(CNotifyOnDelete* pNotifier);
  ~TDeletionMonitor();
  TBool WasDeleted() const;
private:
  CNotifyOnDelete* iNotifier;
  TBool* iOldFlag;
  TBool iWasDeleted;
};

#endif