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diff --git a/lib/element_impl.hpp b/lib/element_impl.hpp
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+//
+// Copyright 2012 Josh Blum
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Lesser General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program 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 Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with io_sig program.  If not, see <http://www.gnu.org/licenses/>.
+
+#ifndef INCLUDED_LIBGNURADIO_ELEMENT_IMPL_HPP
+#define INCLUDED_LIBGNURADIO_ELEMENT_IMPL_HPP
+
+#include <tsbe/block.hpp>
+#include <gnuradio/element.hpp>
+#include <gnuradio/block.hpp>
+#include <gr_types.h>
+#include <vector>
+
+namespace gnuradio
+{
+
+struct ElementImpl
+{
+    //stuff for when its a block
+    std::string name;
+    long unique_id;
+
+    std::vector<size_t> input_items_sizes;
+    std::vector<size_t> output_items_sizes;
+    std::vector<size_t> input_history_items;
+    std::vector<size_t> output_multiple_items;
+
+    //work buffers
+    gr_vector_const_void_star work_input_items;
+    gr_vector_void_star work_output_items;
+    gr_vector_int work_ninput_items;
+    Block::InputItems input_items;
+    Block::OutputItems output_items;
+
+    tsbe::Block block;
+
+    double relative_rate;
+};
+
+} //namespace gnuradio
+
+#endif /*INCLUDED_LIBGNURADIO_ELEMENT_IMPL_HPP*/