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From: Richard Peters (r.a.peters_at_[hidden])
Date: 2004-11-24 10:42:20

"Richard Peters" <r.a.peters_at_[hidden]> wrote in message
> I have implemented a different type of visitor for variant: one that does
> not take the current value held by a variant into account, but a given
> index. The visitor then calls the visit object with a null pointer of the
> type of the index-th argument of variant. This is then used by a
> to extract a value of that type, and assign it to the variant.
> Attached are two diff files, one for variant.hpp and one for
> detail/visitation_impl.hpp, which implement the different visitor and all
> associated functions, which all have 'param' attached somewhere in their
> name -- apply_param_visitor, internal_apply_param_visitor_impl,
> param_visitation_impl_invoke_impl, etc. The serialization is also
> into variant. I do not know if the authors want this in this place, but it
> is just a solution that works.
> Also attached is an example file to demonstrate that it works.
> Oh and I'd like to take the opportunity to thank both the authors of
> boost.variant and boost.serialization, these libraries will make my life
> much easier in my current project.

I realize now that I didn't describe what problem I solved. Oops.
The code in the previous posting gives a general solution for serializing a
variant, so that there is no need to make an ad-hoc serializer for every
different variant.

best regards,

Richard Peters

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