/* -*-  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_