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diff --git a/gr-qtgui/lib/number_sink_impl.h b/gr-qtgui/lib/number_sink_impl.h
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+++ b/gr-qtgui/lib/number_sink_impl.h
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+/* -*- c++ -*- */
+/*
+ * Copyright 2014 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_QTGUI_NUMBER_SINK_IMPL_H
+#define INCLUDED_QTGUI_NUMBER_SINK_IMPL_H
+
+#include <gnuradio/qtgui/number_sink.h>
+#include <gnuradio/qtgui/numberdisplayform.h>
+#include <gnuradio/filter/single_pole_iir.h>
+#include <gnuradio/thread/thread.h>
+#include <gnuradio/high_res_timer.h>
+
+namespace gr {
+  namespace qtgui {
+
+    class QTGUI_API number_sink_impl : public number_sink
+    {
+    private:
+      void initialize();
+
+      gr::thread::mutex d_mutex;
+
+      size_t d_itemsize;
+      std::string d_name;
+      float d_average;
+      graph_t d_type;
+      int d_nconnections;
+
+      int d_index, d_start, d_end;
+      std::vector<double*> d_buffers;
+      std::vector< std::vector<gr::tag_t> > d_tags;
+
+      int d_argc;
+      char *d_argv;
+      QWidget *d_parent;
+      NumberDisplayForm *d_main_gui;
+
+      std::vector<float> d_avg_value;
+      std::vector<filter::single_pole_iir<float,float,float> > d_iir;
+
+      gr::high_res_timer_type d_update_time;
+      gr::high_res_timer_type d_last_time;
+
+      void _reset();
+      void _npoints_resize();
+      void _gui_update_trigger();
+
+    public:
+      number_sink_impl(size_t itemsize,
+		       const std::string &name,
+                       float average=0,
+                       graph_t graph_type=NUM_GRAPH_HORIZ,
+		       int nconnections=1,
+		       QWidget *parent=NULL);
+      ~number_sink_impl();
+
+      bool check_topology(int ninputs, int noutputs);
+
+      void exec_();
+      QWidget*  qwidget();
+
+#ifdef ENABLE_PYTHON
+      PyObject* pyqwidget();
+#endif
+
+      void set_update_time(double t);
+      void set_title(const std::string &title);
+      void set_average(const float avg);
+      void set_graph_type(const graph_t type);
+      void set_color(int which,
+                     const std::string &min,
+                     const std::string &max);
+      void set_color(int which, int min, int max);
+      void set_label(int which, const std::string &label);
+
+      std::string title();
+      float average() const;
+      graph_t graph_type() const;
+      std::string color_min() const;
+      std::string color_max() const;
+      std::string label(int which) const;
+
+      void enable_menu(bool en);
+
+      void reset();
+
+      int work(int noutput_items,
+	       gr_vector_const_void_star &input_items,
+	       gr_vector_void_star &output_items);
+    };
+
+  } /* namespace qtgui */
+} /* namespace gr */
+
+#endif /* INCLUDED_QTGUI_NUMBER_SINK_IMPL_H */