#ifndef BOOST_SERIALIZATION_VERSION_HPP

 #define BOOST_SERIALIZATION_VERSION_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

 // version.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.

 #include <boost/config.hpp>

 #include <boost/mpl/int.hpp>

 #include <boost/mpl/eval_if.hpp>

 #include <boost/mpl/identity.hpp>

 #include <boost/mpl/integral_c_tag.hpp>

 #include <boost/type_traits/is_base_and_derived.hpp>

 //#include <boost/serialization/traits.hpp>

 namespace boost { 

 namespace serialization {

 struct basic_traits;

 // default version number is 0. Override with higher version

 // when class definition changes.

 template<class T>

 struct version

 {

     template<class U>

     struct traits_class_version {

         typedef BOOST_DEDUCED_TYPENAME U::version type;

     };

     typedef mpl::integral_c_tag tag;

     // note: at least one compiler complained w/o the full qualification

     // on basic traits below

     typedef

         BOOST_DEDUCED_TYPENAME mpl::eval_if<

             is_base_and_derived<boost::serialization::basic_traits,T>,

             traits_class_version<T>,

             mpl::int_<0>

         >::type type;

     BOOST_STATIC_CONSTANT(unsigned int, value = version::type::value);

 };

 } // namespace serialization

 } // namespace boost

 // specify the current version number for the class

 #define BOOST_CLASS_VERSION(T, N)                                      \

 namespace boost {                                                      \

 namespace serialization {                                              \

 template<>                                                             \

 struct version<T >                                                     \

 {                                                                      \

     typedef mpl::int_<N> type;                                         \

     typedef mpl::integral_c_tag tag;                                   \

     BOOST_STATIC_CONSTANT(unsigned int, value = version::type::value); \

     /* require that class info saved when versioning is used */        \

     /*                                                                 \

     BOOST_STATIC_ASSERT((                                              \

         mpl::or_<                                                      \

             mpl::equal_to<                                             \

                 mpl::int_<0>,                                          \

                 mpl::int_<N>                                           \

             >,                                                         \

             mpl::equal_to<                                             \

                 implementation_level<T>,                               \

                 mpl::int_<object_class_info>                           \

             >                                                          \

         >::value                                                       \

     ));                                                                \

     */                                                                 \

 };                                                                     \

 }                                                                      \

 }

 #endif // BOOST_SERIALIZATION_VERSION_HPP