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diff --git a/gr-blocks/lib/vector_map_impl.h b/gr-blocks/lib/vector_map_impl.h
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+++ b/gr-blocks/lib/vector_map_impl.h
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+/* -*- c++ -*- */
+/*
+ * Copyright 2012,2013 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_VECTOR_MAP_IMPL_H
+#define INCLUDED_GR_VECTOR_MAP_IMPL_H
+
+#include <blocks/vector_map.h>
+#include <gruel/thread.h>
+
+namespace gr {
+  namespace blocks {
+
+    class vector_map_impl : public vector_map
+    {
+    private:
+      size_t d_item_size;
+      std::vector<size_t> d_in_vlens;
+      std::vector< std::vector< std::vector<size_t> > > d_mapping;
+      gruel::mutex d_mutex; // mutex to protect set/work access
+
+    public:
+      vector_map_impl(size_t item_size, std::vector<size_t> in_vlens,
+                      std::vector< std::vector< std::vector<size_t> > > mapping);
+      ~vector_map_impl();
+
+      void set_mapping(std::vector< std::vector< std::vector<size_t> > > mapping);
+
+      int work(int noutput_items,
+               gr_vector_const_void_star &input_items,
+               gr_vector_void_star &output_items);
+    };
+
+  } /* namespace blocks */
+} /* namespace gr */
+
+#endif /* INCLUDED_GR_VECTOR_MAP_IMPL_H */