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Date: Wed, 13 Mar 2013 15:48:41 -0700 (PDT)
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Subject: Re: Is this expected behavior or not
From: Shark8 <onewingedshark@gmail.com>
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Date: 2013-03-13T15:48:41-07:00
List-Id: <comp.lang.ada>

On Wednesday, March 13, 2013 3:09:24 PM UTC-6, Randy Brukardt wrote:
> "Dmitry A. Kazakov" <mailbox@dmitry-kazakov.de> wrote in message 
> 
> news:11rcs3gg4taww$.bylek8fsshyz$.dlg@40tude.net...
> 
> > On Wed, 13 Mar 2013 17:45:56 +0000, Simon Wright wrote:
> >
> >> I don't remember ever using 'Pred/'Succ,
> >
> > Even in:
> > generic
> >   type Discrete is (<>);
> > package Foo is
> > ?
> 
> I'm not Simon, but in generics I've only used loops on discrete types (the 
> usual reason for such a type being to index an array). In almost all other 
> cases, I've ended up taking 'Pos on them because real math was needed 
> (masking, usually).
> 
> The not-defined procedure 'Succ would have been much more useful because it 
> could replace expressions like:
> 
>     <Very_Long_Name> := <Very_Long_Name> + 1;
> with
>     <Very_Long_Name>'Succ;
> 
> which would eliminate the potential for errors, possibly generate better 
> code (by not having to evaluate <Very_Long_Name> twice if it contains 
> function calls), and eliminate the hair-brained calls for ":=+" operators 
> (which don't even work for Ada).
> 

Would there be a problem using this?

    Generic
	Type T is (<>);
	with function Succ(Input : T) Return T is T'Succ;
    package Test is
	-- Body does whatever is needed requiring Very_Long_Name as T.
    end Test;