#ifndef BOOST_SERIALIZATION_VARIANT_HPP

 #define BOOST_SERIALIZATION_VARIANT_HPP

 // MS compatible compilers support #pragma once

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

 # pragma once

 #endif

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

 #  pragma warning (disable : 4786) // too long name, harmless warning

 #endif

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

 // variant.hpp - non-intrusive serialization of variant types

 //

 // copyright (c) 2005   

 // troy d. straszheim <troy@resophonic.com>

 // http://www.resophonic.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.

 //

 // thanks to Robert Ramey, Peter Dimov, and Richard Crossley.

 //

 #include <boost/mpl/front.hpp>

 #include <boost/mpl/pop_front.hpp>

 #include <boost/mpl/eval_if.hpp>

 #include <boost/mpl/identity.hpp>

 #include <boost/mpl/size.hpp>

 #include <boost/mpl/empty.hpp>

 #include <boost/throw_exception.hpp>

 #include <boost/variant.hpp>

 #include <boost/archive/archive_exception.hpp>

 #include <boost/serialization/split_free.hpp>

 #include <boost/serialization/serialization.hpp>

 namespace boost {

 namespace serialization {

 template<class Archive>

 struct variant_save_visitor : boost::static_visitor<> {

     variant_save_visitor(Archive& ar) :

         m_ar(ar)

     {}

     template<class T>

     void operator()(T const & value) const

     {

         m_ar << BOOST_SERIALIZATION_NVP(value);

     }

 private:

     Archive & m_ar;

 };

 template<class Archive, BOOST_VARIANT_ENUM_PARAMS(/* typename */ class T)>

 void save(

     Archive & ar,

     boost::variant<BOOST_VARIANT_ENUM_PARAMS(T)> const & v,

     unsigned int version

 ){

     int which = v.which();

     ar << BOOST_SERIALIZATION_NVP(which);

     typedef BOOST_DEDUCED_TYPENAME  boost::variant<BOOST_VARIANT_ENUM_PARAMS(T)>::types types;

     variant_save_visitor<Archive> visitor(ar);

     v.apply_visitor(visitor);

 }

 template<class S>

 struct variant_impl {

     struct load_null {

         template<class Archive, class V>

         static void invoke(

             Archive & ar,

             int which,

             V & v,

             unsigned int version

         ){}

     };

     struct load_impl {

         template<class Archive, class V>

         static void invoke(

             Archive & ar,

             int which,

             V & v,

             unsigned int version

         ){

             if(which == 0){

                 // note: A non-intrusive implementation (such as this one)

                 // necessary has to copy the value.  This wouldn't be necessary

                 // with an implementation that de-serialized to the address of the

                 // aligned storage included in the variant.

                 typedef BOOST_DEDUCED_TYPENAME mpl::front<S>::type head_type;

                 head_type value;

                 ar >> BOOST_SERIALIZATION_NVP(value);

                 v = value;

                 ar.reset_object_address(& boost::get<head_type>(v), & value);

                 return;

             }

             typedef BOOST_DEDUCED_TYPENAME mpl::pop_front<S>::type type;

             variant_impl<type>::load(ar, which - 1, v, version);

         }

     };

     template<class Archive, class V>

     static void load(

         Archive & ar,

         int which,

         V & v,

         unsigned int version

     ){

         typedef BOOST_DEDUCED_TYPENAME mpl::eval_if<mpl::empty<S>,

             mpl::identity<load_null>,

             mpl::identity<load_impl>

         >::type typex;

         typex::invoke(ar, which, v, version);

     }

 };

 template<class Archive, BOOST_VARIANT_ENUM_PARAMS(/* typename */ class T)>

 void load(

     Archive & ar, 

     boost::variant<BOOST_VARIANT_ENUM_PARAMS(T)>& v,

     unsigned int version

 ){

     int which;

     typedef BOOST_DEDUCED_TYPENAME boost::variant<BOOST_VARIANT_ENUM_PARAMS(T)>::types types;

     ar >> BOOST_SERIALIZATION_NVP(which);

     if(which >=  mpl::size<types>::value)

         // this might happen if a type was removed from the list of variant types

         boost::throw_exception(

             boost::archive::archive_exception(

                 boost::archive::archive_exception::unsupported_version

             )

         );

     variant_impl<types>::load(ar, which, v, version);

 }

 template<class Archive,BOOST_VARIANT_ENUM_PARAMS(/* typename */ class T)>

 inline void serialize(

     Archive & ar,

     boost::variant<BOOST_VARIANT_ENUM_PARAMS(T)> & v,

     unsigned int file_version

 ){

     split_free(ar,v,file_version);

 }

 } // namespace serialization

 } // namespace boost

 #endif //BOOST_SERIALIZATION_VARIANT_HPP