75 lines
1.9 KiB
C++
75 lines
1.9 KiB
C++
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/* Copyright 2023 Joaquin M Lopez Munoz.
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* Distributed under the Boost Software License, Version 1.0.
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* (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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*
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* See https://www.boost.org/libs/unordered for library home page.
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*/
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#ifndef BOOST_UNORDERED_DETAIL_SERIALIZATION_VERSION_HPP
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#define BOOST_UNORDERED_DETAIL_SERIALIZATION_VERSION_HPP
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#include <boost/config.hpp>
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#include <boost/core/serialization.hpp>
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namespace boost{
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namespace unordered{
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namespace detail{
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/* boost::serialization::load_construct_adl(ar,t,version) requires user code
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* to pass the serialization version for t, when this information is really
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* stored in the archive. serialization_version<T> circumvents this design
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* error by acting as a regular serializable type with the same serialization
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* version as T; loading/saving serialization_version<T> does nothing with
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* the archive data itself but captures the stored serialization version
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* at load() time.
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*/
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template<typename T>
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struct serialization_version
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{
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serialization_version():
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value(boost::serialization::version<serialization_version>::value){}
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serialization_version& operator=(unsigned int x){value=x;return *this;};
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operator unsigned int()const{return value;}
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private:
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friend class boost::serialization::access;
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template<class Archive>
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void serialize(Archive& ar,unsigned int version)
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{
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core::split_member(ar,*this,version);
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}
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template<class Archive>
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void save(Archive&,unsigned int)const{}
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template<class Archive>
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void load(Archive&,unsigned int version)
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{
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this->value=version;
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}
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unsigned int value;
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};
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} /* namespace detail */
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} /* namespace unordered */
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namespace serialization{
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template<typename T>
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struct version<boost::unordered::detail::serialization_version<T> >
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{
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BOOST_STATIC_CONSTANT(int,value=version<T>::value);
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};
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} /* namespace serialization */
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} /* namespace boost */
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#endif
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