From mboxrd@z Thu Jan  1 00:00:00 1970
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From: dewar@cs.nyu.edu (Robert Dewar)
Subject: Re: Zoo question
Date: 1996/08/16
Message-ID: <dewar.840249207@schonberg>#1/1
X-Deja-AN: 174680930
references: <320F16B6.6944@lmtas.lmco.com> <4v0pme$c56@newsbf02.news.aol.com>
organization: Courant Institute of Mathematical Sciences
newsgroups: comp.lang.ada
Date: 1996-08-16T00:00:00+00:00
List-Id: <comp.lang.ada>


John Herro said

"     I realize that the point of this thread is to discuss the raising and
handling of Constraint_Error, but I think for the sake of any beginners
reading comp.lang.ada, we should point out the general rule not to use an
exception handler where a simple "if" will do.  Thus, I think most people
will agree that the above could better be written

if Next_Animal = Animal_ID'Last then
   Next_Animal := Animal_ID'First;
else
   Next_Animal := Animal_ID'Succ(Next_Animal);
end if;"

Actually this is nice application for a modular type, just make the
type be mod 5, then you just do the Succ call and it works fine.
No if needed, no test needed.