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

From: Robert Ramey (ramey_at_[hidden])
Date: 2006-03-20 23:35:13

 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.

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
>
>
> _______________________________________________
> Unsubscribe & other changes:
> http://lists.boost.org/mailman/listinfo.cgi/boost