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+/* -*- mode: C++; c-file-style: "gnu" -*-
+ observer.h
+
+ This file is part of KMail's plugin interface.
+ Copyright (c) 2004 Marc Mutz <mutz@kde.org>
+
+ KMail is free software; you can redistribute it and/or modify it
+ under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 2 of the License, or
+ (at your option) any later version.
+
+ 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_INTERFACES_OBSERVER_H__
+#define __KMAIL_INTERFACES_OBSERVER_H__
+
+namespace KMail {
+ namespace Interface {
+
+ class Observable;
+
+ /**
+ @short observer interface
+ */
+ class Observer {
+ public:
+ virtual ~Observer() {}
+
+ virtual void update( Observable * obs ) = 0;
+ };
+
+ } // namespace Interface
+
+} // namespace KMail
+
+#endif // __KMAIL_INTERFACES_OBSERVER_H__