From mboxrd@z Thu Jan  1 00:00:00 1970
X-Spam-Checker-Version: SpamAssassin 3.4.4 (2020-01-24) on polar.synack.me
X-Spam-Level: 
X-Spam-Status: No, score=0.2 required=5.0 tests=BAYES_00,INVALID_MSGID,
	REPLYTO_WITHOUT_TO_CC autolearn=no autolearn_force=no version=3.4.4
X-Google-Language: ENGLISH,ASCII-7-bit
X-Google-Thread: 103376,99222a5bd46ef3c9
X-Google-Attributes: gid103376,public
From: "John G. Volan" <johnvolan@sprintmail.com>
Subject: Re: GOTO considered necessary (reworked)
Date: 1997/06/23
Message-ID: <33AE23A3.74E1@sprintmail.com>#1/1
X-Deja-AN: 251960181
References: <5nn2fm$11dk$1@prime.imagin.net>
 <199706121410.QAA05823@basement.replay.com> <dewar.866134855@merv>
 <33A0840B.1B41@sprintmail.com> <EBpyzK.5pH@world.std.com>
 <33A58C79.1C7A@sprintmail.com> <dewar.866548262@merv>
Organization: Sprint Internet Passport
Reply-To: johnvolan@sprintmail.com
Newsgroups: comp.lang.ada
Date: 1997-06-23T00:00:00+00:00
List-Id: <comp.lang.ada>


Robert Dewar wrote:
> 
> As for fall through, that is quite a bogus argument. If you map a FSM into
> a loop/case structure with an explicit state variable, then you have to be
> equally careful not to forget to modify the state variable. The error in one
> case is accidental transition to the following state, the error in the other
> is an infinite loop in one state -- not much to call there.
> 
> Of course in practice, one of the advantages of the goto model is that in
> some cases, it is quite natural to fall through to the following state:

[snip example of intentional fall-through]

Of course, what I was referring to was unintended or accidental
fall-through, particularly when introduced inadvertently during
maintenance. As you and others have pointed out, there are ways to
defensively guard against this whether programming a FSM using loop+case
or code+goto.

------------------------------------------------------------------------
Internet.Usenet.Put_Signature 
  (Name       => "John G. Volan",
   Employer   => "Texas Instruments Advanced C3I Systems, San Jose, CA",
   Work_Email => "jvolan@ti.com",
   Home_Email => "johnvolan@sprintmail.com",
   Slogan     => "Ada95: World's *FIRST* International-Standard OOPL",
   Disclaimer => "My employer never defined these opinions, so using" & 
                 "them would be totally erroneous ... or is that"     &
                 "just nondeterministic behavior now? :-) ");
------------------------------------------------------------------------