[boost] Re: Serializing a variant

From: Richard Peters (r.a.peters_at_[hidden])
Date: 2004-11-24 10:23:53

"Johan Nilsson" <johan.nilsson_at_[hidden]> wrote in message
news:cnvd54$uch$1_at_sea.gmane.org...
> "Robert Ramey" <ramey_at_[hidden]> wrote in message
> news:cnt6jr$m32$1_at_sea.gmane.org...
> > Basically, this looks OK to me as well.  I would like to see it made
more
> > automatic and more inline with what other serializations uses.   On one
> > level, this is merely a cosmetic issue.  On the other level, its about
> > leverage of user interface patterns.

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 serializer
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 integrated
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.

best regards,

Richard Peters

begin 666 variant.hpp.diff
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`
end

begin 666 variant_serialization.cpp
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6#0H-"B @("!R971U<FX@,#L-"GT-"@``
`
end

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