multi-type-container.hpp

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/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
#ifndef MULTI_TYPE_CONTAINER_H_
#define MULTI_TYPE_CONTAINER_H_


#include <boost/mpl/inherit_linearly.hpp>
#include <boost/mpl/inherit.hpp>
#include <boost/mpl/at.hpp>

namespace ns3 {
namespace ndn {
namespace ndnSIM {
namespace detail {

template<class T>
struct wrap {
  T value_;
};

template<class Vector>
struct multi_type_container
  : public boost::mpl::inherit_linearly<Vector, boost::mpl::inherit<wrap<boost::mpl::_2>,
                                                                    boost::mpl::_1>>::type {
  template<int N>
  struct index {
    typedef typename boost::mpl::at_c<Vector, N>::type type;
  };

  template<class T>
  T&
  get()
  {
    return static_cast<wrap<T>&>(*this).value_;
  }

  template<class T>
  const T&
  get() const
  {
    return static_cast<const wrap<T>&>(*this).value_;
  }

  template<int N>
  typename boost::mpl::at_c<Vector, N>::type&
  get()
  {
    typedef typename boost::mpl::at_c<Vector, N>::type T;
    return static_cast<wrap<T>&>(*this).value_;
  }

  template<int N>
  const typename boost::mpl::at_c<Vector, N>::type&
  get() const
  {
    typedef typename boost::mpl::at_c<Vector, N>::type T;
    return static_cast<const wrap<T>&>(*this).value_;
  }
};

} // detail
} // ndnSIM
} // ndn
} // ns3


#endif // MULTI_TYPE_CONTAINER_H_