Persistence of limited tagged types

[Jano <nono@celes.unizar.es>]

Hello,

I've read several past threads about this, but to reassure me I want to 
bring it back again, or at least to know the typical workaround.

I have a heterogeneous collection by means of class wide access types, 
where the accessed types itself are descendants of a 

type Object is abstract tagged limited private;

These objects are kind of state-dependent, and I have an abstract method 
which serializes an Object to disk. So far, so good.

The problem comes when I want to reconstruct the collection from disk. I 
can't think of a mean to obtain a valid allocated pointer initialized 
with some dispatching call.

A neat solution could be a function that returned an allocated pointer 
given a tag, but AFAIK there is not such a function.

I think that my only option is to make the type non-limited and couple 
it somehow with the limited components. It's not a so hard change at 
this stage, but I'd be glad to know other people takes on this problem.

Thanks,

-- 
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Jano
402450.at.cepsz.unizar.es
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