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diff --git a/kmail/isubject.h b/kmail/isubject.h
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+/*  -*- mode: C++; c-file-style: "gnu" -*-
+ *
+ *  This file is part of KMail, the KDE mail client.
+ *  Copyright (c) 2003 Carsten Burghardt <burghardt@kde.org>
+ *
+ *  KMail is free software; you can redistribute it and/or modify it
+ *  under the terms of the GNU General Public License, version 2, as
+ *  published by the Free Software Foundation.
+ *
+ *  KMail is distributed in the hope that it will be useful, but
+ *  WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ *  General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program; if not, write to the Free Software
+ *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
+ *
+ *  In addition, as a special exception, the copyright holders give
+ *  permission to link the code of this program with any edition of
+ *  the Qt library by Trolltech AS, Norway (or with modified versions
+ *  of Qt that use the same license as Qt), and distribute linked
+ *  combinations including the two.  You must obey the GNU General
+ *  Public License in all respects for all of the code used other than
+ *  Qt.  If you modify this file, you may extend this exception to
+ *  your version of the file, but you are not obligated to do so.  If
+ *  you do not wish to do so, delete this exception statement from
+ *  your version.
+ */
+
+#ifndef __KMAIL_ISUBJECT_H__
+#define __KMAIL_ISUBJECT_H__
+
+#include "interfaces/observable.h"
+
+#include <qvaluevector.h>
+
+namespace KMail {
+
+  namespace Interface {
+    class Observer;
+  }
+
+  class ISubject : public Interface::Observable {
+  public :
+      virtual ~ISubject();
+
+      /** \reimp Attach the observer if it is not in the list yet */ 
+      void attach( Interface::Observer * );
+
+      /** \reimp Detach the observer */ 
+      void detach( Interface::Observer * );
+
+      /** \reimp Notify all observers ( call observer->update() ) */ 
+      void notify();
+
+  private:
+      QValueVector<Interface::Observer*> mObserverList;
+  };
+
+} // namespace KMail
+
+#endif // __KMAIL_ISUBJECT_H__