Re: Generic package exporting a type with a rep spec

[david.c.hoos.sr@ada95.com]

In article <6j7j5j$7i1$1@newsreader.digex.net>,
  "Bob Mikkelsen" <bobmik@access.digex.net> wrote:
>
> Is there any good way to construct a generic package which exports a data
> structure whose rep spec may vary on separate instantiations?
>
> We are trying to solve a problem where we have data coming in from various
> sources.  All the data requires similar processing when it gets to us, but
> when it is imported or exported to the sources, it may have slightly
> different forms: sometimes 7 bytes, sometimes 11.
>
> We are trying to generalize the representation of the data in the generic by
> bringing the data size into the generic with a generic formal parameter, but
> when we try to use this value in the rep spec, the complier gets very fussy
> (a static value is required).
>
> Any solution not requiring C will be welcomed.
>
Well, I'm not sure I have fully understood your problem, but it sounds like
a job for tagged types.

Assuming that either the source of the message or something in its content
defines of which type it is, tagged types are the ticket, I believe.

I have posted a tagged_types example on my FTP site at:
ftp://ftp.ada95.com/pub/tagged_types

If this is not going in the right direction to solve your problem, please
send more details (preferably by E-Mail)

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