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diff --git a/gr-digital/lib/protocol_formatter_async_impl.h b/gr-digital/lib/protocol_formatter_async_impl.h
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+++ b/gr-digital/lib/protocol_formatter_async_impl.h
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+/* -*- c++ -*- */
+/*
+ * Copyright 2015-2016 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_PROTOCOL_FORMATTER_ASYNC_IMPL_H
+#define INCLUDED_DIGITAL_PROTOCOL_FORMATTER_ASYNC_IMPL_H
+
+#include <gnuradio/digital/protocol_formatter_async.h>
+
+namespace gr {
+  namespace digital {
+
+    class protocol_formatter_async_impl
+      : public protocol_formatter_async
+    {
+     private:
+      header_format_base::sptr d_format;
+
+      pmt::pmt_t d_in_port;
+      pmt::pmt_t d_hdr_port, d_pld_port;
+
+      void append(pmt::pmt_t msg);
+
+     public:
+      protocol_formatter_async_impl(const header_format_base::sptr &format);
+      ~protocol_formatter_async_impl();
+    };
+
+  } // namespace digital
+} // namespace gr
+
+#endif /* INCLUDED_DIGITAL_PROTOCOL_FORMATTER_ASYNC_IMPL_H */