#ifndef BOOST_SERIALIZATION_VARIANT_HPP #define BOOST_SERIALIZATION_VARIANT_HPP // MS compatible compilers support #pragma once #if defined(_MSC_VER) # pragma once #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/serialization/throw_exception.hpp> #include <boost/variant.hpp> #include <boost/archive/archive_exception.hpp> #include <boost/serialization/split_free.hpp> #include <boost/serialization/serialization.hpp> #include <boost/serialization/nvp.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); 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*/, const unsigned int /*version*/ ){} }; struct load_impl { template<class Archive, class V> static void invoke( Archive & ar, int which, V & v, const 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 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 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, const unsigned int version ){ typedef 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, const unsigned int version ){ int which; typedef 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::serialization::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, const unsigned int file_version ){ split_free(ar,v,file_version); } } // namespace serialization } // namespace boost #endif //BOOST_SERIALIZATION_VARIANT_HPP