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From: Lutz Donnerhacke <lutz@iks-jena.de>
Newsgroups: comp.lang.ada
Subject: Re: Ideas for Ada 200X
Date: Wed, 28 May 2003 18:30:55 +0000 (UTC)
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* Robert A Duff wrote:
> "Warren W. Gay VE3WWG" <ve3wwg@cogeco.ca> writes:
>> I disagree that it is "urgent". What is your case for urgency here?
>>  From what I have seen, most people that promote the idea, are just
>> "typing challenged" (yes I know ++i is different than i++).
>
> Well, I like the idea of an increment operation, and my reasoning has
> nothing to do with typing.  The problem is code duplication: you have to
> write "I" twice in "I := I + 1;".  No big deal if it's just "I", but it
> could be a complicated name, so the reader has to careful compare the
> text, and also worry about whether the name has side effects.

Approach 1:
  generic
     type XT is (<>);
  procedure Inc(x : in out XT);
  procedure Inc(x : in out XT) is
  begin
     x := XT'Succ(x);
  end Inc;

Approach 2:
  declare
     x : XT renames complex.express(ion);
  begin
     x := x + 1;
  end;

> Of course, if Ada had such a thing, it shouldn't be called "--".
> If I were the boss, it would be called Incr and Decr.

Why not 'Succ and 'Pred?