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diff --git a/src/Subject.hh b/src/Subject.hh
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+// Subject.hh for FbTk
+// Copyright (c) 2002 Henrik Kinnunen (fluxgen@fluxbox.org)
+//
+// Permission is hereby granted, free of charge, to any person obtaining a
+// copy of this software and associated documentation files (the "Software"),
+// to deal in the Software without restriction, including without limitation
+// the rights to use, copy, modify, merge, publish, distribute, sublicense,
+// and/or sell copies of the Software, and to permit persons to whom the
+// Software is furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in
+// all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+// THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+// DEALINGS IN THE SOFTWARE.
+
+// $Id: Subject.hh,v 1.1 2002/09/07 20:30:45 fluxgen Exp $
+
+#ifndef FBTK_SUBJECT_HH
+#define FBTK_SUBJECT_HH
+
+#include <vector>
+
+namespace FbTk {
+
+class Observer;
+
+class Subject {
+public:
+        Subject();
+        virtual ~Subject();
+        /// attach an observer
+        void attach(Observer *obs);
+        /// detach an observer
+        void detach(Observer *obs);
+        /// notify all attached observers
+        void notify();
+        static void removeObserver(Observer *obs);
+private:
+        typedef std::vector<Observer *> ObserverList;
+        ObserverList m_observerlist;
+
+        typedef std::vector<Subject *> SubjectList;
+        static SubjectList s_subjectlist;
+};
+
+}; // end namespace FbTk
+
+#endif // FBTK_SUBJECT_HH