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159 lines
4.5 KiB
C++
159 lines
4.5 KiB
C++
#ifndef BOOST_SERIALIZATION_VARIANT_HPP
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#define BOOST_SERIALIZATION_VARIANT_HPP
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// MS compatible compilers support #pragma once
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#if defined(_MSC_VER)
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# pragma once
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#endif
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/////////1/////////2/////////3/////////4/////////5/////////6/////////7/////////8
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// variant.hpp - non-intrusive serialization of variant types
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//
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// copyright (c) 2005
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// troy d. straszheim <troy@resophonic.com>
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// http://www.resophonic.com
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//
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// Use, modification and distribution is subject to the Boost Software
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// License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
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// http://www.boost.org/LICENSE_1_0.txt)
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//
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// See http://www.boost.org for updates, documentation, and revision history.
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//
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// thanks to Robert Ramey, Peter Dimov, and Richard Crossley.
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//
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#include <boost/mpl/front.hpp>
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#include <boost/mpl/pop_front.hpp>
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#include <boost/mpl/eval_if.hpp>
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#include <boost/mpl/identity.hpp>
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#include <boost/mpl/size.hpp>
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#include <boost/mpl/empty.hpp>
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#include <boost/serialization/throw_exception.hpp>
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#include <boost/variant.hpp>
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#include <boost/archive/archive_exception.hpp>
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#include <boost/serialization/split_free.hpp>
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#include <boost/serialization/serialization.hpp>
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#include <boost/serialization/nvp.hpp>
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namespace boost {
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namespace serialization {
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template<class Archive>
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struct variant_save_visitor :
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boost::static_visitor<>
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{
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variant_save_visitor(Archive& ar) :
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m_ar(ar)
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{}
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template<class T>
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void operator()(T const & value) const
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{
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m_ar << BOOST_SERIALIZATION_NVP(value);
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}
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private:
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Archive & m_ar;
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};
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template<class Archive, BOOST_VARIANT_ENUM_PARAMS(/* typename */ class T)>
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void save(
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Archive & ar,
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boost::variant<BOOST_VARIANT_ENUM_PARAMS(T)> const & v,
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unsigned int /*version*/
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){
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int which = v.which();
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ar << BOOST_SERIALIZATION_NVP(which);
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variant_save_visitor<Archive> visitor(ar);
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v.apply_visitor(visitor);
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}
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template<class S>
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struct variant_impl {
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struct load_null {
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template<class Archive, class V>
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static void invoke(
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Archive & /*ar*/,
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int /*which*/,
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V & /*v*/,
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const unsigned int /*version*/
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){}
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};
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struct load_impl {
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template<class Archive, class V>
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static void invoke(
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Archive & ar,
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int which,
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V & v,
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const unsigned int version
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){
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if(which == 0){
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// note: A non-intrusive implementation (such as this one)
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// necessary has to copy the value. This wouldn't be necessary
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// with an implementation that de-serialized to the address of the
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// aligned storage included in the variant.
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typedef typename mpl::front<S>::type head_type;
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head_type value;
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ar >> BOOST_SERIALIZATION_NVP(value);
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v = value;
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ar.reset_object_address(& boost::get<head_type>(v), & value);
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return;
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}
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typedef typename mpl::pop_front<S>::type type;
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variant_impl<type>::load(ar, which - 1, v, version);
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}
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};
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template<class Archive, class V>
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static void load(
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Archive & ar,
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int which,
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V & v,
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const unsigned int version
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){
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typedef typename mpl::eval_if<mpl::empty<S>,
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mpl::identity<load_null>,
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mpl::identity<load_impl>
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>::type typex;
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typex::invoke(ar, which, v, version);
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}
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};
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template<class Archive, BOOST_VARIANT_ENUM_PARAMS(/* typename */ class T)>
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void load(
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Archive & ar,
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boost::variant<BOOST_VARIANT_ENUM_PARAMS(T)>& v,
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const unsigned int version
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){
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int which;
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typedef typename boost::variant<BOOST_VARIANT_ENUM_PARAMS(T)>::types types;
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ar >> BOOST_SERIALIZATION_NVP(which);
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if(which >= mpl::size<types>::value)
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// this might happen if a type was removed from the list of variant types
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boost::serialization::throw_exception(
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boost::archive::archive_exception(
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boost::archive::archive_exception::unsupported_version
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)
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);
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variant_impl<types>::load(ar, which, v, version);
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}
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template<class Archive,BOOST_VARIANT_ENUM_PARAMS(/* typename */ class T)>
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inline void serialize(
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Archive & ar,
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boost::variant<BOOST_VARIANT_ENUM_PARAMS(T)> & v,
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const unsigned int file_version
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){
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split_free(ar,v,file_version);
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}
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} // namespace serialization
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} // namespace boost
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#endif //BOOST_SERIALIZATION_VARIANT_HPP
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