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From: Martin Dowie <martin.dowie@btopenworld.com>
Newsgroups: comp.lang.ada
Subject: Re: Converting
Date: Tue, 28 Dec 2004 21:12:33 +0000 (UTC)
Organization: BT Openworld
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Date: 2004-12-28T21:12:33+00:00
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conradwt@runbox.com wrote:
> Hi, I was wondering, could someone tell me the best way to convert s
> string literal to a subtype.  For example,
> 
> subtype A_Type.String is Standard.String;
> subtype B_Type_String is A_Type.String;
> 
> Now, I would like to convert a string literal to B_Type_String.  BTW,
> the method that I'm calling requires the type B_Type_String.  Last but
> least, I using the most recent version of gnat to do the compile.  If
> anyone has any ideas as to the best way to resolve this issue and
> reducing the number of code changes, I would be most appreciative.
> Thanks in advance,

Subtypes don't create new types, so if you have a string literal it is 
most likely to be of type Standard.String anyway (or it could be a 
Wide_String).

I only use subtypes if I'm also adding a constraint to the type (i.e. 
reducing the range of valid values it can take).