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diff --git a/src/systemc/dt/fx/sc_fxnum_observer.cc b/src/systemc/dt/fx/sc_fxnum_observer.cc
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+/*****************************************************************************
+
+  Licensed to Accellera Systems Initiative Inc. (Accellera) under one or
+  more contributor license agreements.  See the NOTICE file distributed
+  with this work for additional information regarding copyright ownership.
+  Accellera licenses this file to you under the Apache License, Version 2.0
+  (the "License"); you may not use this file except in compliance with the
+  License.  You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+  Unless required by applicable law or agreed to in writing, software
+  distributed under the License is distributed on an "AS IS" BASIS,
+  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
+  implied.  See the License for the specific language governing
+  permissions and limitations under the License.
+
+ *****************************************************************************/
+
+/*****************************************************************************
+
+  sc_fxnum_observer.cpp -
+
+  Original Author: Martin Janssen, Synopsys, Inc.
+
+ *****************************************************************************/
+
+/*****************************************************************************
+
+  MODIFICATION LOG - modifiers, enter your name, affiliation, date and
+  changes you are making here.
+
+      Name, Affiliation, Date:
+  Description of Modification:
+
+ *****************************************************************************/
+
+
+// $Log: sc_fxnum_observer.cpp,v $
+// Revision 1.1.1.1  2006/12/15 20:20:04  acg
+// SystemC 2.3
+//
+// Revision 1.3  2006/01/13 18:53:58  acg
+// Andy Goodrich: added $Log command so that CVS comments are reproduced in
+// the source.
+//
+
+#include "systemc/ext/dt/fx/sc_fxnum_observer.hh"
+
+namespace sc_dt
+{
+
+// ----------------------------------------------------------------------------
+//  CLASS : sc_fxnum_observer
+//
+//  Abstract base class for fixed-point types observers; arbitrary precision.
+// ----------------------------------------------------------------------------
+
+sc_fxnum_observer *(* sc_fxnum_observer::default_observer) () = 0;
+
+
+// ----------------------------------------------------------------------------
+//  CLASS : sc_fxnum_fast_observer
+//
+//  Abstract base class for fixed-point types observers; limited precision.
+// ----------------------------------------------------------------------------
+
+sc_fxnum_fast_observer *(* sc_fxnum_fast_observer::default_observer) () = 0;
+
+} // namespace sc_dt