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diff --git a/src/libavoid/viscluster.h b/src/libavoid/viscluster.h
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+/*
+ * vim: ts=4 sw=4 et tw=0 wm=0
+ *
+ * libavoid - Fast, Incremental, Object-avoiding Line Router
+ *
+ * Copyright (C) 2004-2008  Monash University
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ * See the file LICENSE.LGPL distributed with the library.
+ *
+ * Licensees holding a valid commercial license may use this file in
+ * accordance with the commercial license agreement provided with the 
+ * library.
+ *
+ * This library 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.  
+ *
+ * Author(s):   Michael Wybrow <mjwybrow@users.sourceforge.net>
+*/
+
+
+#ifndef AVOID_CLUSTER_H
+#define AVOID_CLUSTER_H
+
+#include <list>
+
+#include "libavoid/geometry.h"
+
+
+namespace Avoid {
+
+class Router;
+class ClusterRef;
+typedef std::list<ClusterRef *> ClusterRefList;
+
+
+class ClusterRef
+{
+    public:
+        ClusterRef(Router *router, unsigned int id, Polygon& poly);
+        ~ClusterRef();
+        void setNewPoly(Polygon& poly);
+        unsigned int id(void);
+        ReferencingPolygon& polygon(void);
+        Router *router(void);
+        void makeActive(void);
+        void makeInactive(void);
+
+    private:
+        Router *_router;
+        unsigned int _id;
+        ReferencingPolygon _poly;
+        bool _active;
+        ClusterRefList::iterator _pos;
+};
+
+
+}
+
+
+#endif
+
+