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diff --git a/gr-digital/lib/constellation_decoder_cb_impl.h b/gr-digital/lib/constellation_decoder_cb_impl.h
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+++ b/gr-digital/lib/constellation_decoder_cb_impl.h
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+/* -*- c++ -*- */
+/*
+ * Copyright 2011,2012 Free Software Foundation, Inc.
+ * 
+ * This file is part of GNU Radio
+ * 
+ * GNU Radio 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 3, or (at your option)
+ * any later version.
+ * 
+ * GNU Radio 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 GNU Radio; see the file COPYING.  If not, write to
+ * the Free Software Foundation, Inc., 51 Franklin Street,
+ * Boston, MA 02110-1301, USA.
+ */
+
+#ifndef INCLUDED_DIGITAL_CONSTELLATION_DECODER_CB_IMPL_H
+#define INCLUDED_DIGITAL_CONSTELLATION_DECODER_CB_IMPL_H
+
+#include <digital/constellation_decoder_cb.h>
+
+namespace gr {
+  namespace digital {
+
+    class constellation_decoder_cb_impl : public constellation_decoder_cb
+    {
+    private:
+      constellation_sptr d_constellation;
+      unsigned int d_dim;
+
+    public:
+      constellation_decoder_cb_impl(constellation_sptr constellation);
+      ~constellation_decoder_cb_impl();
+
+      void forecast(int noutput_items,
+		    gr_vector_int &ninput_items_required);
+  
+      int general_work(int noutput_items,
+		       gr_vector_int &ninput_items,
+		       gr_vector_const_void_star &input_items,
+		       gr_vector_void_star &output_items);
+    };
+
+  } /* namespace digital */
+} /* namespace gr */
+
+#endif /* INCLUDED_DIGITAL_CONSTELLATION_DECODER_CB_IMPL_H */