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