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/////////1/////////2/////////3/////////4/////////5/////////6/////////7/////////8
// (C) Copyright 2002-4 Pavel Vozenilek .
// 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)
// Provides non-intrusive serialization for boost::optional.
#ifndef BOOST_SERIALIZATION_OPTIONAL_HPP_
#define BOOST_SERIALIZATION_OPTIONAL_HPP_
#if defined(_MSC_VER)
# pragma once
#endif
#include <boost/config.hpp>
#include <boost/archive/detail/basic_iarchive.hpp>
#include <boost/optional.hpp>
#include <boost/move/utility_core.hpp>
#include <boost/serialization/item_version_type.hpp>
#include <boost/serialization/split_free.hpp>
#include <boost/serialization/level.hpp>
#include <boost/serialization/nvp.hpp>
#include <boost/serialization/version.hpp>
#include <boost/type_traits/is_pointer.hpp>
#include <boost/serialization/detail/stack_constructor.hpp>
#include <boost/serialization/detail/is_default_constructible.hpp>
#include <boost/serialization/force_include.hpp>
// function specializations must be defined in the appropriate
// namespace - boost::serialization
namespace boost {
namespace serialization {
template<class Archive, class T>
void save(
Archive & ar,
const boost::optional< T > & t,
const unsigned int /*version*/
){
// It is an inherent limitation to the serialization of optional.hpp
// that the underlying type must be either a pointer or must have a
// default constructor. It's possible that this could change sometime
// in the future, but for now, one will have to work around it. This can
// be done by serialization the optional<T> as optional<T *>
#if ! defined(BOOST_NO_CXX11_HDR_TYPE_TRAITS)
BOOST_STATIC_ASSERT(
boost::serialization::detail::is_default_constructible<T>::value
|| boost::is_pointer<T>::value
);
#endif
const bool tflag = t.is_initialized();
ar << boost::serialization::make_nvp("initialized", tflag);
if (tflag){
ar << boost::serialization::make_nvp("value", *t);
}
}
template<class Archive, class T>
void load(
Archive & ar,
boost::optional< T > & t,
const unsigned int version
){
bool tflag;
ar >> boost::serialization::make_nvp("initialized", tflag);
if(! tflag){
t.reset();
return;
}
if(0 == version){
boost::serialization::item_version_type item_version(0);
boost::archive::library_version_type library_version(
ar.get_library_version()
);
if(boost::archive::library_version_type(3) < library_version){
ar >> BOOST_SERIALIZATION_NVP(item_version);
}
}
if(! t.is_initialized())
t = T();
ar >> boost::serialization::make_nvp("value", *t);
}
template<class Archive, class T>
void serialize(
Archive & ar,
boost::optional< T > & t,
const unsigned int version
){
boost::serialization::split_free(ar, t, version);
}
template<class T>
struct version<boost::optional<T> > {
BOOST_STATIC_CONSTANT(int, value = 1);
};
} // serialization
} // boost
#endif // BOOST_SERIALIZATION_OPTIONAL_HPP_
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