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+// Observer.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: Observer.hh,v 1.1 2002/09/07 20:30:45 fluxgen Exp $
+
+#ifndef FBTK_OBSERVER_HH
+#define FBTK_OBSERVER_HH
+
+namespace FbTk {
+
+class Subject;
+
+class Observer {
+public:
+        virtual ~Observer();
+        virtual void update(Subject *changedSubj) = 0;
+};
+
+}; // end namespace FBTK
+
+#endif // FBTK_OBSERVER_HH