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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)
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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/item_version_type.hpp>
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#include <boost/serialization/library_version_type.hpp>
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#include <boost/serialization/version.hpp>
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#include <boost/serialization/split_free.hpp>
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#include <boost/serialization/nvp.hpp>
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#include <boost/type_traits/is_pointer.hpp>
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#include <boost/serialization/detail/is_default_constructible.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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// It is an inherent limitation to the serialization of optional.hpp
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// that the underlying type must be either a pointer or must have a
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// default constructor. It's possible that this could change sometime
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// in the future, but for now, one will have to work around it. This can
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// be done by serialization the optional<T> as optional<T *>
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#if ! defined(BOOST_NO_CXX11_HDR_TYPE_TRAITS)
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BOOST_STATIC_ASSERT(
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boost::serialization::detail::is_default_constructible<T>::value
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|| boost::is_pointer<T>::value
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);
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#endif
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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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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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t.reset();
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return;
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}
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if(0 == version){
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boost::serialization::item_version_type item_version(0);
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boost::serialization::library_version_type library_version(
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ar.get_library_version()
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);
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if(boost::serialization::library_version_type(3) < library_version){
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ar >> BOOST_SERIALIZATION_NVP(item_version);
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}
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}
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if(! t.is_initialized())
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t = T();
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ar >> boost::serialization::make_nvp("value", *t);
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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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template<class T>
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struct version<boost::optional<T> > {
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BOOST_STATIC_CONSTANT(int, value = 1);
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};
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} // serialization
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} // boost
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#endif // BOOST_SERIALIZATION_OPTIONAL_HPP_
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