diff --git a/ndn-cpp/trie/detail/functor-hook.h b/ndn-cpp/trie/detail/functor-hook.h
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+++ b/ndn-cpp/trie/detail/functor-hook.h
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+/* -*-  Mode: C++; c-file-style: "gnu"; indent-tabs-mode:nil; -*- */
+/*
+ * Copyright (c) 2012 University of California, Los Angeles
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation;
+ *
+ * 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ *
+ * Author: Alexander Afanasyev <alexander.afanasyev@ucla.edu>
+ */
+
+#ifndef FUNCTOR_HOOK_H_
+#define FUNCTOR_HOOK_H_
+
+#include <boost/intrusive/parent_from_member.hpp>
+
+namespace ns3 {
+namespace ndn {
+namespace ndnSIM {
+namespace detail {
+
+template<class BaseHook, class ValueType, int N>
+struct FunctorHook
+{
+  typedef typename BaseHook::template index<N>::type hook_type;
+  typedef hook_type*            hook_ptr;
+  typedef const hook_type*      const_hook_ptr;
+  
+  typedef ValueType             value_type;
+  typedef value_type*           pointer;
+  typedef const value_type*     const_pointer;
+  
+  //Required static functions
+  static hook_ptr to_hook_ptr (value_type &value)
+  {  return &value.policy_hook_.template get<N> (); }
+  
+  static const_hook_ptr to_hook_ptr(const value_type &value)
+  {  return &value.policy_hook_.template get<N> (); }
+  
+  static pointer to_value_ptr(hook_ptr n)
+  {
+    return
+      boost::intrusive::get_parent_from_member<value_type>
+      (static_cast<BaseHook*> (boost::intrusive::get_parent_from_member< wrap<hook_type> >(n, &wrap<hook_type>::value_)),
+       &value_type::policy_hook_);
+  }
+  static const_pointer to_value_ptr(const_hook_ptr n)
+  {
+    return
+      boost::intrusive::get_parent_from_member<value_type>
+      (static_cast<const BaseHook*> (boost::intrusive::get_parent_from_member< wrap<hook_type> >(n, &wrap<hook_type>::value_)),
+       &value_type::policy_hook_);
+  }
+};
+
+} // detail
+} // ndnSIM
+} // ndn
+} // ns3
+
+#endif // FUNCTOR_HOOK_H_