#ifndef BOOST_SERIALIZATION_TRAITS_HPP

 #define BOOST_SERIALIZATION_TRAITS_HPP

 // MS compatible compilers support #pragma once

 #if defined(_MSC_VER) && (_MSC_VER >= 1020)

 # pragma once

 #endif

 /////////1/////////2/////////3/////////4/////////5/////////6/////////7/////////8

 // traits.hpp:

 // (C) Copyright 2002 Robert Ramey - http://www.rrsd.com . 

 // Use, modification and distribution is subject to the Boost Software

 // License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at

 // http://www.boost.org/LICENSE_1_0.txt)

 //  See http://www.boost.org for updates, documentation, and revision history.

 // This header is used to apply serialization traits to templates.  The

 // standard system can't be used for platforms which don't support

 // Partial Templlate Specialization.  

 // The motivation for this is the Name-Value Pair (NVP) template.

 // it has to work the same on all platforms in order for archives

 // to be portable accross platforms.

 #include <boost/config.hpp>

 #include <boost/static_assert.hpp>

 #include <boost/mpl/int.hpp>

 #include <boost/serialization/level_enum.hpp>

 #include <boost/serialization/tracking_enum.hpp>

 namespace boost {

 namespace serialization {

 // common base class used to detect appended traits class

 struct basic_traits {};

 template <class T>

 struct extended_type_info_impl;

 template<

     class T, 

     int Level, 

     int Tracking,

     unsigned int Version = 0,

     class ETII = extended_type_info_impl< T >

 >

 struct traits : public basic_traits {

     BOOST_STATIC_ASSERT(Version == 0 || Level >= object_class_info);

     BOOST_STATIC_ASSERT(Tracking == track_never || Level >= object_serializable);

     typedef BOOST_DEDUCED_TYPENAME mpl::int_<Level> level;

     typedef BOOST_DEDUCED_TYPENAME mpl::int_<Tracking> tracking;

     typedef BOOST_DEDUCED_TYPENAME mpl::int_<Version> version;

     typedef ETII type_info_implementation;

 };

 } // namespace serialization

 } // namespace boost

 #endif // BOOST_SERIALIZATION_TRAITS_HPP