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/////////1/////////2/////////3/////////4/////////5/////////6/////////7/////////8
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// (C) Copyright 2002-4 Pavel Vozenilek .
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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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// Provides non-intrusive serialization for boost::optional.
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#ifndef BOOST_SERIALIZATION_OPTIONAL_HPP_
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#define BOOST_SERIALIZATION_OPTIONAL_HPP_
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#if defined(_MSC_VER) && (_MSC_VER >= 1020)
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# pragma once
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#endif
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#include <boost/config.hpp>
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#include <boost/optional.hpp>
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#include <boost/serialization/split_free.hpp>
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#include <boost/serialization/level.hpp>
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#include <boost/serialization/nvp.hpp>
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#include <boost/serialization/detail/stack_constructor.hpp>
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// function specializations must be defined in the appropriate
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// namespace - boost::serialization
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namespace boost {
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namespace serialization {
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template<class Archive, class T>
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void save(
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Archive & ar,
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const boost::optional<T> & t,
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const unsigned int /*version*/
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){
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const bool tflag = t.is_initialized();
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ar << boost::serialization::make_nvp("initialized", tflag);
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if (tflag){
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if(3 < ar.get_library_version()){
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const int v = version<T>::value;
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ar << make_nvp("item_version", v);
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}
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ar << boost::serialization::make_nvp("value", *t);
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}
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}
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template<class Archive, class T>
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void load(
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Archive & ar,
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boost::optional<T> & t,
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const unsigned int /*version*/
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){
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bool tflag;
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ar >> boost::serialization::make_nvp("initialized", tflag);
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if (tflag){
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unsigned int v;
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if(3 < ar.get_library_version()){
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ar >> make_nvp("item_version", v);
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}
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detail::stack_construct<Archive, T> aux(ar, v);
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ar >> boost::serialization::make_nvp("value", aux.reference());
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t.reset(aux.reference());
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}
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else {
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t.reset();
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}
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}
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template<class Archive, class T>
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void serialize(
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Archive & ar,
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boost::optional<T> & t,
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const unsigned int version
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){
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boost::serialization::split_free(ar, t, version);
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}
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// the following would be slightly more efficient. But it
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// would mean that archives created with programs that support
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// TPS wouldn't be readable by programs that don't support TPS.
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// Hence we decline to support this otherwise convenient optimization.
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//#ifndef BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION
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#if 0
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template <class T>
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struct implementation_level<optional<T> >
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{
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typedef mpl::integral_c_tag tag;
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typedef mpl::int_<boost::serialization::object_serializable> type;
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BOOST_STATIC_CONSTANT(
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int ,
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value = boost::serialization::implementation_level::type::value
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);
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};
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template<class T>
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struct tracking_level<optional<T> >
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{
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typedef mpl::integral_c_tag tag;
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typedef mpl::int_<boost::serialization::track_never> type;
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BOOST_STATIC_CONSTANT(
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int ,
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value = boost::serialization::tracking_level::type::value
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);
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};
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#endif
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} // serialization
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} // namespace boost
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#endif // BOOST_SERIALIZATION_OPTIONAL_HPP_
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