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- #ifndef BOOST_SERIALIZATION_VERSION_HPP
- #define BOOST_SERIALIZATION_VERSION_HPP
- // MS compatible compilers support #pragma once
- #if defined(_MSC_VER)
- # pragma once
- #endif
- /////////1/////////2/////////3/////////4/////////5/////////6/////////7/////////8
- // version.hpp:
- // (C) Copyright 2002 Robert Ramey - http://www.rrsd.com .
- // 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)
- // See http://www.boost.org for updates, documentation, and revision history.
- #include <boost/config.hpp>
- #include <boost/mpl/assert.hpp>
- #include <boost/mpl/int.hpp>
- #include <boost/mpl/eval_if.hpp>
- #include <boost/mpl/identity.hpp>
- #include <boost/mpl/integral_c_tag.hpp>
- #include <boost/type_traits/is_base_and_derived.hpp>
- namespace boost {
- namespace serialization {
- struct basic_traits;
- // default version number is 0. Override with higher version
- // when class definition changes.
- template<class T>
- struct version
- {
- template<class U>
- struct traits_class_version {
- typedef typename U::version type;
- };
- typedef mpl::integral_c_tag tag;
- // note: at least one compiler complained w/o the full qualification
- // on basic traits below
- typedef
- typename mpl::eval_if<
- is_base_and_derived<boost::serialization::basic_traits,T>,
- traits_class_version< T >,
- mpl::int_<0>
- >::type type;
- BOOST_STATIC_CONSTANT(int, value = version::type::value);
- };
- #ifndef BOOST_NO_INCLASS_MEMBER_INITIALIZATION
- template<class T>
- const int version<T>::value;
- #endif
- } // namespace serialization
- } // namespace boost
- /* note: at first it seemed that this would be a good place to trap
- * as an error an attempt to set a version # for a class which doesn't
- * save its class information (including version #) in the archive.
- * However, this imposes a requirement that the version be set after
- * the implemention level which would be pretty confusing. If this
- * is to be done, do this check in the input or output operators when
- * ALL the serialization traits are available. Included the implementation
- * here with this comment as a reminder not to do this!
- */
- #include <boost/mpl/less.hpp>
- #include <boost/mpl/comparison.hpp>
- // specify the current version number for the class
- // version numbers limited to 8 bits !!!
- #define BOOST_CLASS_VERSION(T, N) \
- namespace boost { \
- namespace serialization { \
- template<> \
- struct version<T > \
- { \
- typedef mpl::int_<N> type; \
- typedef mpl::integral_c_tag tag; \
- BOOST_STATIC_CONSTANT(int, value = version::type::value); \
- BOOST_MPL_ASSERT(( \
- boost::mpl::less< \
- boost::mpl::int_<N>, \
- boost::mpl::int_<256> \
- > \
- )); \
- /* \
- BOOST_MPL_ASSERT(( \
- mpl::equal_to< \
- :implementation_level<T >, \
- mpl::int_<object_class_info> \
- >::value \
- )); \
- */ \
- }; \
- } \
- }
- #endif // BOOST_SERIALIZATION_VERSION_HPP
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