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From: "Dmitry A. Kazakov" <mailbox@dmitry-kazakov.de>
Subject: Re: for S'Image use Func??
Newsgroups: comp.lang.ada
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References: <Xns9D7085FECB88EWarrensBlatherings@188.40.43.213>
Date: Thu, 6 May 2010 19:23:18 +0200
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Date: 2010-05-06T19:23:13+02:00
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On Thu, 6 May 2010 17:10:20 +0000 (UTC), Warren wrote:

> I have tried to google for this and have not yet found
> a suitable answer, so I'll troll, er, poll for an
> answer here..
> 
> Is there the ability to substitute your own S'Image
> function? For example, a basic interpreter might
> define:
> 
>  type LNumber_Type is range 0..99_999;
> 
> Can I declare..
> 
>  for LNumber_Type'Image use LNumber_To_String;
> 
> If so, then the question is what the signature of 
> the S'Image function looks like-- is it:
> 
>  function LNumber_To_String(LNO : LNumber_Type) return String;

I am not sure what do you mean, but the following is legal Ada:

   generic
      type T is private;
      with function Image (X : T) return String;   
   package P is
      ...
   end P;

   type LNumber_Type is range 0..99_999;   

   package PI is new P (LNumber_Type, LNumber_Type'Image);

So attribute is a "plain" function with a clumsy name.

-- 
Regards,
Dmitry A. Kazakov
http://www.dmitry-kazakov.de