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diff --git a/gnuradio-runtime/lib/gr_hier_block2_detail.h b/gnuradio-runtime/lib/gr_hier_block2_detail.h
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+++ b/gnuradio-runtime/lib/gr_hier_block2_detail.h
@@ -0,0 +1,74 @@
+/* -*- c++ -*- */
+/*
+ * Copyright 2006,2007,2009 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_HIER_BLOCK2_DETAIL_H
+#define INCLUDED_GR_HIER_BLOCK2_DETAIL_H
+
+#include <gr_runtime_api.h>
+#include <gr_hier_block2.h>
+#include <gr_flat_flowgraph.h>
+#include <boost/utility.hpp>
+
+/*!
+ * \ingroup internal
+ */
+class GR_RUNTIME_API gr_hier_block2_detail : boost::noncopyable
+{
+public:
+  gr_hier_block2_detail(gr_hier_block2 *owner);
+  ~gr_hier_block2_detail();
+
+  void connect(gr_basic_block_sptr block);
+  void connect(gr_basic_block_sptr src, int src_port,
+	       gr_basic_block_sptr dst, int dst_port);
+  void msg_connect(gr_basic_block_sptr src, pmt::pmt_t srcport,
+	       gr_basic_block_sptr dst, pmt::pmt_t dstport);
+  void msg_disconnect(gr_basic_block_sptr src, pmt::pmt_t srcport,
+	       gr_basic_block_sptr dst, pmt::pmt_t dstport);
+  void disconnect(gr_basic_block_sptr block);
+  void disconnect(gr_basic_block_sptr, int src_port,
+		  gr_basic_block_sptr, int dst_port);
+  void disconnect_all();
+  void lock();
+  void unlock();
+  void flatten_aux(gr_flat_flowgraph_sptr sfg) const;
+
+private:
+
+  // Private implementation data
+  gr_hier_block2 *d_owner;
+  gr_hier_block2_detail *d_parent_detail;
+  gr_flowgraph_sptr d_fg;
+  std::vector<gr_endpoint_vector_t> d_inputs; // Multiple internal endpoints per external input
+  gr_endpoint_vector_t d_outputs;             // Single internal endpoint per external output
+  gr_basic_block_vector_t d_blocks;
+
+
+  void connect_input(int my_port, int port, gr_basic_block_sptr block);
+  void connect_output(int my_port, int port, gr_basic_block_sptr block);
+  void disconnect_input(int my_port, int port, gr_basic_block_sptr block);
+  void disconnect_output(int my_port, int port, gr_basic_block_sptr block);
+
+  gr_endpoint_vector_t resolve_port(int port, bool is_input);
+  gr_endpoint_vector_t resolve_endpoint(const gr_endpoint &endp, bool is_input) const;
+};
+
+#endif /* INCLUDED_GR_HIER_BLOCK2_DETAIL_H */