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From: "Randy Brukardt" <randy@rrsoftware.com>
Newsgroups: comp.lang.ada
Subject: Re: Is this expected behavior or not
Date: Wed, 13 Mar 2013 16:09:24 -0500
Organization: Jacob Sparre Andersen Research & Innovation
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Date: 2013-03-13T16:09:24-05:00
List-Id: <comp.lang.ada>

"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).

                                       Randy.