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diff --git a/gr-blocks/lib/selector_impl.h b/gr-blocks/lib/selector_impl.h
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+++ b/gr-blocks/lib/selector_impl.h
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+/* -*- c++ -*- */
+/*
+ * Copyright 2019 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_GR_SELECTOR_IMPL_H
+#define INCLUDED_GR_SELECTOR_IMPL_H
+
+#include <gnuradio/blocks/selector.h>
+#include <gnuradio/thread/thread.h>
+
+namespace gr {
+namespace blocks {
+
+class selector_impl : public selector
+{
+private:
+    size_t d_itemsize;
+    bool d_enabled;
+    unsigned int d_input_index, d_output_index;
+    unsigned int d_num_inputs, d_num_outputs; // keep track of the topology
+
+    gr::thread::mutex d_mutex;
+
+
+public:
+    selector_impl(size_t itemsize, unsigned int input_index, unsigned int output_index);
+    ~selector_impl();
+
+    void forecast(int noutput_items, gr_vector_int& ninput_items_required);
+    bool check_topology(int ninputs, int noutputs);
+    void setup_rpc();
+    void handle_enable(pmt::pmt_t msg);
+    void set_enabled(bool enable)
+    {
+        gr::thread::scoped_lock l(d_mutex);
+        d_enabled = enable;
+    }
+    bool enabled() const { return d_enabled; }
+
+    void set_input_index(unsigned int input_index);
+    int input_index() const { return d_input_index; }
+
+    void set_output_index(unsigned int output_index);
+    int output_index() const { return d_output_index; }
+
+    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 blocks */
+} /* namespace gr */
+
+#endif /* INCLUDED_GR_SELECTOR_IMPL_H */