boost/serialization/shared_ptr_helper.hpp
#ifndef BOOST_SERIALIZATION_SHARED_PTR_HELPER_HPP #define BOOST_SERIALIZATION_SHARED_PTR_HELPER_HPP // MS compatible compilers support #pragma once #if defined(_MSC_VER) # pragma once #endif /////////1/////////2/////////3/////////4/////////5/////////6/////////7/////////8 // shared_ptr_helper.hpp: serialization for boost shared pointer // (C) Copyright 2004-2009 Robert Ramey, Martin Ecker and Takatoshi Kondo // 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 <map> #include <list> #include <utility> #include <cstddef> // NULL #include <boost/config.hpp> #include <boost/shared_ptr.hpp> #include <boost/type_traits/is_polymorphic.hpp> #include <boost/mpl/if.hpp> #include <boost/serialization/singleton.hpp> #include <boost/serialization/extended_type_info.hpp> #include <boost/serialization/throw_exception.hpp> #include <boost/serialization/type_info_implementation.hpp> #include <boost/archive/archive_exception.hpp> namespace boost_132 { template<class T> class shared_ptr; } namespace boost { namespace serialization { #ifndef BOOST_NO_MEMBER_TEMPLATE_FRIENDS template<class Archive, template<class U> class SPT > void load( Archive & ar, SPT< class U > &t, const unsigned int file_version ); #endif /////////1/////////2/////////3/////////4/////////5/////////6/////////7/////////8 // a common class for holding various types of shared pointers template<template<class T> class SPT> class shared_ptr_helper { typedef std::map< const void *, // address of object SPT<const void> // address shared ptr to single instance > object_shared_pointer_map; // list of shared_pointers create accessible by raw pointer. This // is used to "match up" shared pointers loaded at different // points in the archive. Note, we delay construction until // it is actually used since this is by default included as // a "mix-in" even if shared_ptr isn't used. object_shared_pointer_map * m_o_sp; struct null_deleter { void operator()(void const *) const {} }; #if defined(BOOST_NO_MEMBER_TEMPLATE_FRIENDS) \ || defined(BOOST_MSVC) \ || defined(__SUNPRO_CC) public: #else template<class Archive, class U> friend void boost::serialization::load( Archive & ar, SPT< U > &t, const unsigned int file_version ); #endif #ifdef BOOST_SERIALIZATION_SHARED_PTR_132_HPP // list of loaded pointers. This is used to be sure that the pointers // stay around long enough to be "matched" with other pointers loaded // by the same archive. These are created with a "null_deleter" so that // when this list is destroyed - the underlying raw pointers are not // destroyed. This has to be done because the pointers are also held by // new system which is disjoint from this set. This is implemented // by a change in load_construct_data below. It makes this file suitable // only for loading pointers into a 1.33 or later boost system. std::list<boost_132::shared_ptr<const void> > * m_pointers_132; void append(const boost_132::shared_ptr<const void> & t){ if(NULL == m_pointers_132) m_pointers_132 = new std::list<boost_132::shared_ptr<const void> >; m_pointers_132->push_back(t); } #endif struct non_polymorphic { template<class U> static const boost::serialization::extended_type_info * get_object_type(U & ){ return & boost::serialization::singleton< typename boost::serialization::type_info_implementation< U >::type >::get_const_instance(); } }; struct polymorphic { template<class U> static const boost::serialization::extended_type_info * get_object_type(U & u){ return boost::serialization::singleton< typename boost::serialization::type_info_implementation< U >::type >::get_const_instance().get_derived_extended_type_info(u); } }; public: template<class T> void reset(SPT< T > & s, T * t){ if(NULL == t){ s.reset(); return; } const boost::serialization::extended_type_info * this_type = & boost::serialization::type_info_implementation< T >::type ::get_const_instance(); // get pointer to the most derived object's eti. This is effectively // the object type identifier typedef typename mpl::if_< is_polymorphic< T >, polymorphic, non_polymorphic >::type type; const boost::serialization::extended_type_info * true_type = type::get_object_type(*t); // note:if this exception is thrown, be sure that derived pointer // is either registered or exported. if(NULL == true_type) boost::serialization::throw_exception( boost::archive::archive_exception( boost::archive::archive_exception::unregistered_class, this_type->get_debug_info() ) ); // get void pointer to the most derived type // this uniquely identifies the object referred to // oid = "object identifier" const void * oid = void_downcast( *true_type, *this_type, t ); if(NULL == oid) boost::serialization::throw_exception( boost::archive::archive_exception( boost::archive::archive_exception::unregistered_cast, true_type->get_debug_info(), this_type->get_debug_info() ) ); // make tracking array if necessary if(NULL == m_o_sp) m_o_sp = new object_shared_pointer_map; typename object_shared_pointer_map::iterator i = m_o_sp->find(oid); // if it's a new object if(i == m_o_sp->end()){ s.reset(t); std::pair<typename object_shared_pointer_map::iterator, bool> result; result = m_o_sp->insert(std::make_pair(oid, s)); BOOST_ASSERT(result.second); } // if the object has already been seen else{ s = SPT<T>(i->second, t); } } shared_ptr_helper() : m_o_sp(NULL) #ifdef BOOST_SERIALIZATION_SHARED_PTR_132_HPP , m_pointers_132(NULL) #endif {} virtual ~shared_ptr_helper(){ if(NULL != m_o_sp) delete m_o_sp; #ifdef BOOST_SERIALIZATION_SHARED_PTR_132_HPP if(NULL != m_pointers_132) delete m_pointers_132; #endif } }; } // namespace serialization } // namespace boost #endif // BOOST_SERIALIZATION_SHARED_PTR_HELPER_HPP