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Date: 4 Nov 92 03:11:33 GMT
From: portal!cup.portal.com!R_Tim_Coslet@uunet.uu.net
Subject: Re: help with Ada question
Message-ID: <68832@cup.portal.com>
List-Id: <comp.lang.ada>

In article: <1992Nov1.090527.29814@beaver.cs.washington.edu>
	pschwrtz@lynx.cs.washington.edu (Paul Schwartz) wrote:
>robert walker (rwalker@barnacle.micro.umn.edu) wrote:
>: 
>: If neither an exit nor a goto statement were available for Ada, how
>: might you simulate the action of an exit statement?
>: 
>	The easiest way would be to put the loop in a block and use an
>EXCEPTION to get out of the loop.  As in;
>fooLoop:
>BEGIN
>	LOOP
>		IF <condition> THEN
>		RAISE Some_Error;
>		END IF;
>
>       stuff
>	END LOOP;
>	EXCEPTION 
>	WHEN Some_Error => NULL; --you just wanted out of the loop
>END fooLoop;
>
It may be EASY, but don't EVER use exceptions as a "normal" means of
exiting a loop!!!! The overhead of an exception may be significant and
this is a misuse of the feature!!!

This is fine, IFF the exit from the loop was because of an error condition
that would normally never occur.

Of course this is purely a "class assignment" question, as any real programming
rules would never prohibit use of exit statements!

                                        R. Tim Coslet

Usenet: R_Tim_Coslet@cup.portal.com
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