attribute-container-accessor-helper.h

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/* -*-  Mode: C++; c-file-style: "gnu"; indent-tabs-mode:nil; -*- */
/*
 * Copyright (c) 2018 Caliola Engineering, LLC.
 *
 * 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: Jared Dulmage <jared.dulmage@caliola.com>
 */
 
#ifndef ATTRIBUTE_CONTAINER_ACCESSOR_HELPER_H
#define ATTRIBUTE_CONTAINER_ACCESSOR_HELPER_H
 
#include "attribute-container.h"
 
#include <ns3/attribute-helper.h>
 
 
#include <type_traits>
#include <list>
 
namespace ns3 {
 
template <typename T>
struct has_const_iterator
{
private:
  typedef char yes;
  typedef struct
  {
    char array[2]; 
  } no;
 
  template <typename C> static yes test (typename C::const_iterator *);
  template <typename C> static no test (...);
 
public:
  static const bool value = sizeof (test<T> (0)) == sizeof (yes);
  typedef T type;
};
 
template <typename T>
struct has_begin_end
{
  template <typename C> static char (&f (typename std::enable_if<
    std::is_same<decltype (static_cast<typename C::const_iterator (C::*) () const> (&C::begin)),
    typename C::const_iterator (C::*) () const>::value, void>::type *))[1];
 
  template <typename C> static char (&f (...))[2];
 
  template <typename C> static char (&g (typename std::enable_if<
    std::is_same<decltype (static_cast<typename C::const_iterator (C::*) () const> (&C::end)),
    typename C::const_iterator (C::*) () const>::value, void>::type *))[1];
 
  template <typename C> static char (&g (...))[2];
 
  static bool const beg_value = sizeof (f<T> (0)) == 1;
  static bool const end_value = sizeof (g<T> (0)) == 1;
};
 
template<typename T> 
struct is_container : std::integral_constant<bool, has_const_iterator<T>::value && has_begin_end<T>::beg_value && has_begin_end<T>::end_value> 
{ };
 
template <typename V, typename T, template <typename...> class U, typename ...I,
          typename = typename std::enable_if< ( is_container< U<I...> >::value ), void>::type >
inline
Ptr<const AttributeAccessor>
DoMakeAccessorHelperOne (U<I...> T::*memberContainer)
{
  /* AttributeAcessor implementation for a class member variable. */
  class MemberContainer : public AccessorHelper<T,V>
  {
    public:
    /*
     * Construct from a class data member address.
     * \param [in] memberContainer The class data member address.
     */
    MemberContainer (U<I...> T::*memberContainer)
      : AccessorHelper<T,V> (),
        m_memberContainer (memberContainer)
    {}
    private:
    virtual bool DoSet (T *object, const V *v) const {
      // typename AccessorTrait<U<I>::value_type>::Result tmp;
      // bool ok = v->GetAccessor (tmp);
      // if (!ok)
      //   {
      //     return false;
      //   }
      auto src = v->Get ();
      (object->*m_memberContainer).clear ();
      std::copy (src.begin (), src.end (), std::inserter ((object->*m_memberContainer), (object->*m_memberContainer).end ()));
      return true;
    }
    virtual bool DoGet (const T *object, V *v) const {
      v->Set (object->*m_memberContainer);
      return true;
    }
    virtual bool HasGetter (void) const {
      return true;
    }
    virtual bool HasSetter (void) const {
      return true;
    }
 
    U<I...> T::*m_memberContainer;  // Address of the class data member.
  };
  return Ptr<const AttributeAccessor> (new MemberContainer (memberContainer), false);
}
 
} // namespace ns3
 
#endif  // ATTRIBUTE_CONTAINER_ACCESSOR_HELPER_H