/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
/**
 * Copyright (c) 2011-2015  Regents of the University of California.
 *
 * This file is part of ndnSIM. See AUTHORS for complete list of ndnSIM authors and
 * contributors.
 *
 * ndnSIM 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 of the License, or (at your option) any later version.
 *
 * ndnSIM 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
 * ndnSIM, e.g., in COPYING.md file.  If not, see <http://www.gnu.org/licenses/>.
 **/

#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_