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diff --git a/lib/hackrf/hackrf_sink_c.h b/lib/hackrf/hackrf_sink_c.h
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+++ b/lib/hackrf/hackrf_sink_c.h
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+/* -*- c++ -*- */
+/*
+ * Copyright 2013 Dimitri Stolnikov <horiz0n@gmx.net>
+ *
+ * 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_HACKRF_SINK_C_H
+#define INCLUDED_HACKRF_SINK_C_H
+
+#include <boost/shared_ptr.hpp>
+
+class hackrf_sink_c;
+
+/*
+ * We use boost::shared_ptr's instead of raw pointers for all access
+ * to gr_blocks (and many other data structures).  The shared_ptr gets
+ * us transparent reference counting, which greatly simplifies storage
+ * management issues.  This is especially helpful in our hybrid
+ * C++ / Python system.
+ *
+ * See http://www.boost.org/libs/smart_ptr/smart_ptr.htm
+ *
+ * As a convention, the _sptr suffix indicates a boost::shared_ptr
+ */
+typedef boost::shared_ptr<hackrf_sink_c> hackrf_sink_c_sptr;
+
+/*!
+ * \brief Return a shared_ptr to a new instance of hackrf_sink_c.
+ *
+ * To avoid accidental use of raw pointers, hackrf_sink_c's
+ * constructor is private.  make_hackrf_sink_c is the public
+ * interface for creating new instances.
+ */
+hackrf_sink_c_sptr make_hackrf_sink_c (const std::string & args = "");
+
+class hackrf_sink_c
+{
+private:
+  // The friend declaration allows hackrf_make_sink_c to
+  // access the private constructor.
+  friend hackrf_sink_c_sptr make_hackrf_sink_c (const std::string & args);
+
+  hackrf_sink_c (const std::string & args);  	// private constructor
+
+public:
+  ~hackrf_source_c (); 	// public destructor
+};
+
+#endif /* INCLUDED_HACKRF_SINK_C_H */