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diff --git a/gr-digital/lib/ts_insert_zeros_cc_impl.h b/gr-digital/lib/ts_insert_zeros_cc_impl.h
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+++ b/gr-digital/lib/ts_insert_zeros_cc_impl.h
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+/* -*- c++ -*- */
+/* 
+ * Copyright 2012 <+YOU OR YOUR COMPANY+>.
+ * 
+ * This 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.
+ * 
+ * This software 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 software; see the file COPYING.  If not, write to
+ * the Free Software Foundation, Inc., 51 Franklin Street,
+ * Boston, MA 02110-1301, USA.
+ */
+
+#ifndef INCLUDED_DIGITAL_TS_INSERT_ZEROS_CC_IMPL_H
+#define INCLUDED_DIGITAL_TS_INSERT_ZEROS_CC_IMPL_H
+
+#include <digital/ts_insert_zeros_cc.h>
+#include <vector>
+
+namespace gr {
+  namespace digital {
+
+    class ts_insert_zeros_cc_impl : public ts_insert_zeros_cc
+    {
+    private:
+      const std::string d_lengthtagname;
+      
+    public:
+      ts_insert_zeros_cc_impl(const std::string &lengthtagname);
+      ~ts_insert_zeros_cc_impl();
+
+      void forecast(int noutput_items, gr_vector_int &ninput_items_required);
+      
+      // Where all the action really happens
+      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
+