Re: [boost] [Wave][Serialization] Problems with class versioning

From: Hartmut Kaiser (hartmut.kaiser_at_[hidden])
Date: 2006-03-21 10:00:29

Robert Ramey wrote:

>  My best guess is that you're using a binary archive and the 
> maximum version number stored/recovered in a binary archive 
> is 1 byte - 255.

That's it! Thanks a lot.

Regards Hartmut

> Another guess might be that if the type is part of a 
> collection, it might have tripped on a recently reported bug 
> that that lost the version number of the items in a 
> collection.  I don't know if that's your case or which 
> version you are using.
> 
> Robert Ramey
> 
> Hartmut Kaiser wrote:
> > Hi all,
> >
> > I was trying to add class versioning to the serialization 
> code for the 
> > Wave library (for storing macro tables et.al.) but couldn't 
> succeed. 
> > I've added a class version to the code by adding:
> >
> > namespace boost { namespace serialization {
> >
> > template<
> >    typename Iterator, typename LexIterator,
> >    typename InputPolicy, typename Hooks
> >>
> > struct version<boost::wave::context<Iterator, LexIterator, 
> > InputPolicy, Hooks> > {
> >    typedef boost::wave::context<Iterator, LexIterator, InputPolicy,
> >        Hooks> target_type;
> >    typedef mpl::int_<target_type::version> type;  // 
> version == 0x100
> >    typedef mpl::integral_c_tag tag;
> >    BOOST_STATIC_CONSTANT(unsigned int, value = 
> version::type::value); 
> > };
> >
> > }}  // namespace boost::serialization
> >
> > The save function of the context<> now get's called during 
> > serialization with the correct version value. But during load the 
> > context<>::load function still get's passed zero as the loaded 
> > version. Is this a known behaviour, am I ding something 
> wrong (perhaps 
> > essential:
> > context is explicitely marked as 'track_never')?
> >
> > Regards Hartmut
> >
> >
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> 
> 
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