basic_iarchive.cpp

C++的一个好库。。。现在很流行

        // note: extra line used to evade borland issue
        const int id = cp.class_id;
        const cobject_id & co = cobject_id_vector[id];
        // with the appropriate input serializer, 
        // delete the indicated object
        co.bis_ptr->destroy(cp.get_address());
        created_pointers.pop_front();
    }
}

inline class_id_type
basic_iarchive_impl::register_type(
    const basic_iserializer & bis
){
    class_id_type id(static_cast<int>(cobject_info_set.size()));
    cobject_type co(id, bis);
    std::pair<cobject_info_set_type::const_iterator, bool>
        result = cobject_info_set.insert(co);

    if(result.second){
        cobject_id_vector.push_back(cobject_id(bis));
        assert(cobject_info_set.size() == cobject_id_vector.size());
    }
    id = result.first->class_id;
    // borland complains without this minor hack
    const int tid = id;
    cobject_id & coid = cobject_id_vector[tid];
    coid.bpis_ptr = bis.get_bpis_ptr();
    return id;
}

void
basic_iarchive_impl::load_preamble(
    basic_iarchive & ar,
    cobject_id & co
){
    if(! co.initialized){
        if(co.bis_ptr->class_info()){
            class_id_optional_type cid;
            load(ar, cid);    // to be thrown away
            load(ar, co.tracking_level);
            load(ar, co.file_version);
        }
        else{
            // override tracking with indicator from class information
            co.tracking_level = co.bis_ptr->tracking(m_flags);
            co.file_version = version_type(
                co.bis_ptr->version()
            );
        }
        co.initialized = true;
    }
}

bool
basic_iarchive_impl::track(
    basic_iarchive & ar,
    void * & t
){
    object_id_type oid;
    load(ar, oid);

    // if its a reference to a old object
    if(object_id_type(object_id_vector.size()) > oid){
        // we're done
        t = object_id_vector[oid].address;
        return false;
    }
    return true;
}

inline void
basic_iarchive_impl::load_object(
    basic_iarchive & ar,
    void * t,
    const basic_iserializer & bis
){
    // if its been serialized through a pointer and the preamble's been done
    if(t == pending_object && & bis == pending_bis){
        // read data
        (bis.load_object_data)(ar, t, pending_version);
        return;
    }

    const class_id_type cid = register_type(bis);
    // note: extra line used to evade borland issue
    const int id = cid;
    cobject_id & co = cobject_id_vector[id];

    load_preamble(ar, co);

    // save the current move stack position in case we want to truncate it
    boost::state_saver<object_id_type> w(moveable_objects_start);

    // note: extra line used to evade borland issue
    const bool tracking = co.tracking_level;

    object_id_type this_id;
    moveable_objects_start =
    this_id = object_id_vector.size();

    // if we tracked this object when the archive was saved
    if(tracking){ 
        // if it was already read
        if(!track(ar, t))
            // we're done
            return;
        // add a new enty into the tracking list
        object_id_vector.push_back(aobject(t, cid));
        // and add an entry for this object
        moveable_objects_end = object_id_vector.size();
    }
    // read data
    (bis.load_object_data)(ar, t, co.file_version);
    moveable_objects_recent = this_id;
}

inline const basic_pointer_iserializer *
basic_iarchive_impl::load_pointer(
    basic_iarchive &ar,
    void * & t,
    const basic_pointer_iserializer * bpis_ptr,
    const basic_pointer_iserializer * (*finder)(
        const boost::serialization::extended_type_info & type_
    )
){
    class_id_type cid;
    load(ar, cid);

    if(NULL_POINTER_TAG == cid){
        t = NULL;
        return bpis_ptr;
    }

    // if its a new class type - i.e. never been registered
    if(class_id_type(cobject_info_set.size()) <= cid){
        // if its either abstract
        if(NULL == bpis_ptr
        // or polymorphic
        || bpis_ptr->get_basic_serializer().is_polymorphic()){
            // is must have been exported
            char key[BOOST_SERIALIZATION_MAX_KEY_SIZE];
            class_name_type class_name(key);
            load(ar, class_name);
            // if it has a class name
            const serialization::extended_type_info *eti = NULL;
            if(0 != key[0])
                eti = serialization::extended_type_info::find(key);
            if(NULL == eti)
                boost::throw_exception(
                    archive_exception(archive_exception::unregistered_class)
                );
            bpis_ptr = (*finder)(*eti);
        }
        assert(NULL != bpis_ptr);
        class_id_type new_cid = register_type(bpis_ptr->get_basic_serializer());
        int i = cid;
        cobject_id_vector[i].bpis_ptr = bpis_ptr;
        assert(new_cid == cid);
    }
    int i = cid;
    cobject_id & co = cobject_id_vector[i];
    bpis_ptr = co.bpis_ptr;

    load_preamble(ar, co);

    // extra line to evade borland issue
    const bool tracking = co.tracking_level;
    // if we're tracking and the pointer has already been read
    if(tracking && ! track(ar, t))
        // we're done
        return bpis_ptr;

    // save state
    state_saver<object_id_type> w(moveable_objects_start);

    if(! tracking){
        bpis_ptr->load_object_ptr(ar, t, co.file_version);
    }
    else{
        state_saver<void *> x(pending_object);
        state_saver<const basic_iserializer *> y(pending_bis);
        state_saver<version_type> z(pending_version);

        pending_bis = & bpis_ptr->get_basic_serializer();
        pending_version = co.file_version;

        // predict next object id to be created
        const unsigned int ui = object_id_vector.size();

        state_saver<object_id_type> w(moveable_objects_end);

        // because the following operation could move the items
        // don't use co after this
        // add to list of serialized objects so that we can properly handle
        // cyclic strucures
        object_id_vector.push_back(aobject(t, cid));

        bpis_ptr->load_object_ptr(
            ar, 
            object_id_vector[ui].address, 
            co.file_version
        );
        t = object_id_vector[ui].address;
        assert(NULL != t);

        // and add to list of created pointers
        created_pointers.push_back(created_pointer_type(cid, t));
    }

    return bpis_ptr;
}

//////////////////////////////////////////////////////////////////////
// implementation of basic_iarchive functions

BOOST_ARCHIVE_DECL(void)
basic_iarchive::next_object_pointer(void *t){
    pimpl->next_object_pointer(t);
}

BOOST_ARCHIVE_DECL(BOOST_PP_EMPTY())
basic_iarchive::basic_iarchive(unsigned int flags) : 
    pimpl(new basic_iarchive_impl(flags))
{}

BOOST_ARCHIVE_DECL(BOOST_PP_EMPTY())
basic_iarchive::~basic_iarchive()
{
    delete pimpl;
}

BOOST_ARCHIVE_DECL(void)
basic_iarchive::set_library_version(unsigned int archive_library_version){
    pimpl->set_library_version(archive_library_version);
}

BOOST_ARCHIVE_DECL(void)
basic_iarchive::reset_object_address(
    const void * new_address, 
    const void * old_address
){
    pimpl->reset_object_address(new_address, old_address);
}

BOOST_ARCHIVE_DECL(void)
basic_iarchive::load_object(
    void *t, 
    const basic_iserializer & bis
){
    pimpl->load_object(*this, t, bis);
}

// load a pointer object
BOOST_ARCHIVE_DECL(const basic_pointer_iserializer *)
basic_iarchive::load_pointer(
    void * &t, 
    const basic_pointer_iserializer * bpis_ptr,
    const basic_pointer_iserializer * (*finder)(
        const boost::serialization::extended_type_info & type_
    )
){
    return pimpl->load_pointer(*this, t, bpis_ptr, finder);
}

BOOST_ARCHIVE_DECL(void)
basic_iarchive::register_basic_serializer(const basic_iserializer & bis){
    pimpl->register_type(bis);
}

BOOST_ARCHIVE_DECL(void)
basic_iarchive::lookup_basic_helper(
    const boost::serialization::extended_type_info * const eti,
    shared_ptr<void> & sph
){
    pimpl->lookup_helper(eti, sph);
}

BOOST_ARCHIVE_DECL(void)
basic_iarchive::insert_basic_helper(
    const boost::serialization::extended_type_info * const eti,
    shared_ptr<void> & sph
){
    pimpl->insert_helper(eti, sph);
}

BOOST_ARCHIVE_DECL(void)
basic_iarchive::delete_created_pointers()
{
    pimpl->delete_created_pointers();
}

BOOST_ARCHIVE_DECL(unsigned int) 
basic_iarchive::get_library_version() const{
    return pimpl->m_archive_library_version;
}

BOOST_ARCHIVE_DECL(unsigned int) 
basic_iarchive::get_flags() const{
    return pimpl->m_flags;
}

} // namespace detail
} // namespace archive
} // namespace boost