Re: [Boost-users] [boost::serialization] Howto store derived classes through pointer to base - with templates and own archive?

From: Ovanes Markarian (om_boost_at_[hidden])
Date: 2007-01-29 11:01:39

Not sure whether this helps, but just from reading what BOOST_CLASS_EXPORT does I think you can
not export incomplete types. If B is template, then a unique name is generated by a compiler for
every specialization of B. Let's say:

template<class T>
struct B
{
   ...
};

B<int> is different type from B<double>. BOOST_CLASS_EXPORT will not generate export of
B<all_possible_types>.

You need to explicitly state which B<of_type_X> you would like to export. This is my asumption.

Good Luck,
Ovanes

On Mon, January 29, 2007 16:36, Marc Wäckerlin wrote:
> Marc Wäckerlin wrote:
>> But it still does not step into the correct child. After some more
>> reading, I guess, that I'd have to use BOOST_CLASS_EXPORT(B), but that
>> does not compile, because B is a template class.
>
> A, B, ... are in a namespace, let's say "abc". Now, I can write:
>   BOOST_CLASS_EXPORT(::abc::B)
> But this must be outside of all namespaces.
>
> Then I get:
> --------------------------------------------------------------------------------
> /usr/include/boost/archive/detail/iserializer.hpp:197: undefined reference
> to
> `boost::archive::detail::archive_pointer_iserializer<image::BinaryReader>::~archive_pointer_iserializer()'
> bitsets-bitsets.o: In function `~pointer_oserializer':
> /usr/include/boost/archive/detail/oserializer.hpp:184: undefined reference
> to
> `boost::archive::detail::archive_pointer_oserializer<image::BinaryWriter>::~archive_pointer_oserializer()'
> --------------------------------------------------------------------------------
>
>
> What's wrong, what's missing, what do I have to do?
>
>
> BTW: This newsgroup is *extremely* slow. I wait for hours and hours until I
> see my message!
>
>
> Regards
> Marc
>
>
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