/usr/include/boost/serialization/optional.hpp is in libboost1.55-dev 1.55.0+dfsg-3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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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) && (_MSC_VER >= 1020)
# pragma once
#endif
#include <boost/config.hpp>
#include <boost/archive/detail/basic_iarchive.hpp>
#include <boost/optional.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/serialization/detail/stack_constructor.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*/
){
const bool tflag = t.is_initialized();
ar << boost::serialization::make_nvp("initialized", tflag);
if (tflag){
const boost::serialization::item_version_type item_version(version< T >::value);
#if 0
const 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);
}
#else
ar << BOOST_SERIALIZATION_NVP(item_version);
#endif
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){
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){
// item_version is handled as an attribute so it doesnt need an NVP
ar >> BOOST_SERIALIZATION_NVP(item_version);
}
detail::stack_construct<Archive, T> aux(ar, item_version);
ar >> boost::serialization::make_nvp("value", aux.reference());
t.reset(aux.reference());
}
else {
t.reset();
}
}
template<class Archive, class T>
void serialize(
Archive & ar,
boost::optional< T > & t,
const unsigned int version
){
boost::serialization::split_free(ar, t, version);
}
// the following would be slightly more efficient. But it
// would mean that archives created with programs that support
// TPS wouldn't be readable by programs that don't support TPS.
// Hence we decline to support this otherwise convenient optimization.
//#ifndef BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION
#if 0
template <class T>
struct implementation_level<optional< T > >
{
typedef mpl::integral_c_tag tag;
typedef mpl::int_<boost::serialization::object_serializable> type;
BOOST_STATIC_CONSTANT(
int ,
value = boost::serialization::implementation_level::type::value
);
};
template<class T>
struct tracking_level<optional< T > >
{
typedef mpl::integral_c_tag tag;
typedef mpl::int_<boost::serialization::track_never> type;
BOOST_STATIC_CONSTANT(
int ,
value = boost::serialization::tracking_level::type::value
);
};
#endif
} // serialization
} // namespace boost
#endif // BOOST_SERIALIZATION_OPTIONAL_HPP_
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