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diff --git a/chaos/src/chaos_base.hpp b/chaos/src/chaos_base.hpp
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+// 
+//  
+//  chaos~
+//  Copyright (C) 2004  Tim Blechmann
+//  
+//  This program 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.
+//  
+//  This program 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; see the file COPYING.  If not, write to
+//  the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+//  Boston, MA 02111-1307, USA.
+
+#ifndef __chaos_base_hpp
+
+#include "chaos.hpp"
+
+class chaos_base
+{
+
+public:
+	t_sample get_data(unsigned int i)
+	{
+		return (t_sample)m_data[i]; /* this is not save, but fast */
+	}
+
+	int get_num_eq()
+	{
+		return m_num_eq;
+	}
+
+	/* prototype for system function */
+	virtual void m_step();
+
+	data_t * m_data;       // state of the system
+
+protected:
+	int m_num_eq;  // number of equations of the system
+};
+
+#define CHAOS_CALLBACKS							\
+FLEXT_CALLGET_F(m_system->get_num_eq);
+
+#define CHAOS_ATTRIBUTES								\
+FLEXT_ADDATTR_GET("dimension",m_system->get_num_eq);
+
+#define __chaos_base_hpp
+#endif /* __chaos_base_hpp */