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From: "Alex R. Mosteo" <devnull@mailinator.com>
Newsgroups: comp.lang.ada
Subject: Re: Efficiently setting up large quantities of constant data
Date: Thu, 16 Dec 2004 19:29:18 +0100
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Date: 2004-12-16T19:29:18+01:00
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Michael Mounteney wrote:
> I want to set up about 100 variables which somehow reference
> variable-length arrays of other things.  The other things, for a given
> variable, are fixed.  Simplifying:
> 
>      type component is
>           record
>                X : character;
>           end record;
> 
>      type component_list is array (positive range <>) of component;
> 
>      type component_ref is access all component_list;
> 
>      type structure is
>           record
>                part : component_ref;
>           end record;
> 
> So I will have lots of structures scattered about, which will be
> completely constant.  I would like to enforce this constancy, but Ada
> (as far as I know) does not (unlike C++;  that should get some hackles
> rising) allow `constant' to be splashed about in type definitions. 
> This is on GNAT, which does not support pragma read_only.
> 
> Is there any way to ensure that these data are not modified, other
> than by forbidding direct access to structure.part etc?

Reading the other posts I think you may be interested in the resource 
management of AWS [Ada Web Server].