Current File : //backups/router/usr/local/include/boost/serialization/optional.hpp
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// (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/optional.hpp>
#ifndef BOOST_NO_CXX17_HDR_OPTIONAL
#include <optional>
#endif
#include <boost/serialization/item_version_type.hpp>
#include <boost/serialization/library_version_type.hpp>
#include <boost/serialization/version.hpp>
#include <boost/serialization/split_free.hpp>
#include <boost/serialization/nvp.hpp>
#include <boost/type_traits/is_pointer.hpp>
#include <boost/serialization/detail/is_default_constructible.hpp>
// function specializations must be defined in the appropriate
// namespace - boost::serialization
namespace boost {
namespace serialization {
namespace detail {
// OT is of the form optional<T>
template<class Archive, class OT>
void save_impl(
Archive & ar,
const OT & ot
){
// 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 *>
#ifndef BOOST_NO_CXX11_HDR_TYPE_TRAITS
BOOST_STATIC_ASSERT(
boost::serialization::detail::is_default_constructible<typename OT::value_type>::value
|| boost::is_pointer<typename OT::value_type>::value
);
#endif
const bool tflag(ot);
ar << boost::serialization::make_nvp("initialized", tflag);
if (tflag){
ar << boost::serialization::make_nvp("value", *ot);
}
}
// OT is of the form optional<T>
template<class Archive, class OT>
void load_impl(
Archive & ar,
OT & ot,
const unsigned int version
){
bool tflag;
ar >> boost::serialization::make_nvp("initialized", tflag);
if(! tflag){
ot.reset();
return;
}
if(0 == version){
boost::serialization::item_version_type item_version(0);
boost::serialization::library_version_type library_version(
ar.get_library_version()
);
if(boost::serialization::library_version_type(3) < library_version){
ar >> BOOST_SERIALIZATION_NVP(item_version);
}
}
typename OT::value_type t;
ar >> boost::serialization::make_nvp("value",t);
ot = t;
}
} // detail
template<class Archive, class T>
void save(
Archive & ar,
const boost::optional< T > & ot,
const unsigned int /*version*/
){
detail::save_impl(ar, ot);
}
#ifndef BOOST_NO_CXX17_HDR_OPTIONAL
template<class Archive, class T>
void save(
Archive & ar,
const std::optional< T > & ot,
const unsigned int /*version*/
){
detail::save_impl(ar, ot);
}
#endif
template<class Archive, class T>
void load(
Archive & ar,
boost::optional< T > & ot,
const unsigned int version
){
detail::load_impl(ar, ot, version);
}
#ifndef BOOST_NO_CXX17_HDR_OPTIONAL
template<class Archive, class T>
void load(
Archive & ar,
std::optional< T > & ot,
const unsigned int version
){
detail::load_impl(ar, ot, version);
}
#endif
template<class Archive, class T>
void serialize(
Archive & ar,
boost::optional< T > & ot,
const unsigned int version
){
boost::serialization::split_free(ar, ot, version);
}
#ifndef BOOST_NO_CXX17_HDR_OPTIONAL
template<class Archive, class T>
void serialize(
Archive & ar,
std::optional< T > & ot,
const unsigned int version
){
boost::serialization::split_free(ar, ot, version);
}
#endif
template<class T>
struct version<boost::optional<T> >{
BOOST_STATIC_CONSTANT(int, value = 1);
};
#ifndef BOOST_NO_CXX17_HDR_OPTIONAL
template<class T>
struct version<std::optional<T> >{
BOOST_STATIC_CONSTANT(int, value = 1);
};
#endif
} // serialization
} // boost
#endif // BOOST_SERIALIZATION_OPTIONAL_HPP
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