author | Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com> |
Tue, 02 Feb 2010 02:01:42 +0200 | |
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#ifndef BOOST_SERIALIZATION_VARIANT_HPP |
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#define BOOST_SERIALIZATION_VARIANT_HPP |
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// MS compatible compilers support #pragma once |
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#if defined(_MSC_VER) && (_MSC_VER >= 1020) |
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# pragma once |
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#endif |
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#if defined(_MSC_VER) && (_MSC_VER <= 1020) |
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# pragma warning (disable : 4786) // too long name, harmless warning |
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#endif |
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/////////1/////////2/////////3/////////4/////////5/////////6/////////7/////////8 |
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// variant.hpp - non-intrusive serialization of variant types |
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// |
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// copyright (c) 2005 |
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// troy d. straszheim <troy@resophonic.com> |
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// http://www.resophonic.com |
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// |
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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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// |
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// See http://www.boost.org for updates, documentation, and revision history. |
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// |
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// thanks to Robert Ramey, Peter Dimov, and Richard Crossley. |
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// |
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#include <boost/mpl/front.hpp> |
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#include <boost/mpl/pop_front.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/size.hpp> |
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#include <boost/mpl/empty.hpp> |
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#include <boost/throw_exception.hpp> |
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#include <boost/variant.hpp> |
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#include <boost/archive/archive_exception.hpp> |
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#include <boost/serialization/split_free.hpp> |
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#include <boost/serialization/serialization.hpp> |
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namespace boost { |
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namespace serialization { |
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template<class Archive> |
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struct variant_save_visitor : boost::static_visitor<> { |
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variant_save_visitor(Archive& ar) : |
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m_ar(ar) |
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{} |
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template<class T> |
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void operator()(T const & value) const |
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{ |
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m_ar << BOOST_SERIALIZATION_NVP(value); |
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} |
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private: |
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Archive & m_ar; |
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}; |
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template<class Archive, BOOST_VARIANT_ENUM_PARAMS(/* typename */ class T)> |
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void save( |
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Archive & ar, |
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boost::variant<BOOST_VARIANT_ENUM_PARAMS(T)> const & v, |
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unsigned int version |
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){ |
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int which = v.which(); |
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ar << BOOST_SERIALIZATION_NVP(which); |
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typedef BOOST_DEDUCED_TYPENAME boost::variant<BOOST_VARIANT_ENUM_PARAMS(T)>::types types; |
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variant_save_visitor<Archive> visitor(ar); |
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v.apply_visitor(visitor); |
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} |
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template<class S> |
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struct variant_impl { |
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struct load_null { |
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template<class Archive, class V> |
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static void invoke( |
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Archive & ar, |
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int which, |
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V & v, |
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unsigned int version |
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){} |
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}; |
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struct load_impl { |
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template<class Archive, class V> |
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static void invoke( |
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Archive & ar, |
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int which, |
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V & v, |
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unsigned int version |
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){ |
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if(which == 0){ |
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// note: A non-intrusive implementation (such as this one) |
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// necessary has to copy the value. This wouldn't be necessary |
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// with an implementation that de-serialized to the address of the |
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// aligned storage included in the variant. |
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typedef BOOST_DEDUCED_TYPENAME mpl::front<S>::type head_type; |
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head_type value; |
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ar >> BOOST_SERIALIZATION_NVP(value); |
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v = value; |
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ar.reset_object_address(& boost::get<head_type>(v), & value); |
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return; |
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} |
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typedef BOOST_DEDUCED_TYPENAME mpl::pop_front<S>::type type; |
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variant_impl<type>::load(ar, which - 1, v, version); |
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} |
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}; |
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|
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template<class Archive, class V> |
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static void load( |
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Archive & ar, |
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int which, |
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V & v, |
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unsigned int version |
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){ |
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typedef BOOST_DEDUCED_TYPENAME mpl::eval_if<mpl::empty<S>, |
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mpl::identity<load_null>, |
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mpl::identity<load_impl> |
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>::type typex; |
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typex::invoke(ar, which, v, version); |
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} |
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|
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}; |
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|
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template<class Archive, BOOST_VARIANT_ENUM_PARAMS(/* typename */ class T)> |
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void load( |
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Archive & ar, |
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boost::variant<BOOST_VARIANT_ENUM_PARAMS(T)>& v, |
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unsigned int version |
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){ |
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int which; |
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typedef BOOST_DEDUCED_TYPENAME boost::variant<BOOST_VARIANT_ENUM_PARAMS(T)>::types types; |
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ar >> BOOST_SERIALIZATION_NVP(which); |
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if(which >= mpl::size<types>::value) |
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// this might happen if a type was removed from the list of variant types |
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boost::throw_exception( |
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boost::archive::archive_exception( |
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boost::archive::archive_exception::unsupported_version |
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) |
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); |
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variant_impl<types>::load(ar, which, v, version); |
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} |
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|
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template<class Archive,BOOST_VARIANT_ENUM_PARAMS(/* typename */ class T)> |
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inline void serialize( |
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Archive & ar, |
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boost::variant<BOOST_VARIANT_ENUM_PARAMS(T)> & v, |
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unsigned int file_version |
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){ |
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split_free(ar,v,file_version); |
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} |
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|
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} // namespace serialization |
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} // namespace boost |
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#endif //BOOST_SERIALIZATION_VARIANT_HPP |
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161 |