| #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/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); |
| 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*/, |
| 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 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, |
| const 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, |
| const 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::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 |