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From: "Randy Brukardt" <randy@rrsoftware.com>
Newsgroups: comp.lang.ada
Subject: Re: Ada.Locales pseudo-string types
Date: Thu, 9 Aug 2012 15:47:25 -0500
Organization: Jacob Sparre Andersen Research & Innovation
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Date: 2012-08-09T15:47:25-05:00
List-Id: <comp.lang.ada>

"Jacob Sparre Andersen" <sparre@nbi.dk> wrote in message 
news:87mx274066.fsf@adaheads.sparre-andersen.dk...
> Adam Beneschan wrote:
>
>> They already are a subtype of Character, i.e. the subtype "Character
>> range 'a' .. 'z'".  The only way to make it convertible is to get rid
>> of the range.
>
> What about using an aspect to instead of a subtype?  Wouldn't that allow
> the conversion, while still keeping the constraints?

No.

>   subtype Language_Code is String (1 .. 3)
>     with Static_Predicate => Language_Code (1) in 'a' .. 'z' and
>                              Language_Code (2) in 'a' .. 'z' and
>                              Language_Code (3) in 'a' .. 'z';

The rule requires static matching, and that requires the same static 
predicates.

The requirement on the type conversions seems rather unfriendly, certainly 
for String; but I can't predict what the ARG will do with this one.

                                      Randy.