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=-1.9 required=5.0 tests=BAYES_00 autolearn=ham
	autolearn_force=no version=3.4.4
X-Google-Language: ENGLISH,ASCII-7-bit
X-Google-Thread: 103376,a327d56b3d5e9a4
X-Google-Attributes: gid103376,public
X-Google-ArrivalTime: 2002-11-13 08:35:03 PST
Path: 
 archiver1.google.com!news1.google.com!newsfeed.stanford.edu!bloom-beacon.mit.edu!news-out.cwix.com!newsfeed.cwix.com!prodigy.com!smallfeed.triton.net!triton.net!newsfeeder.triton.net!news-peer.gradwell.net!not-for-mail
Newsgroups: comp.lang.ada
From: porton@ex-code.com (Victor Porton)
Date: Wed, 13 Nov 2002 20:40:26 +0500
References: <3dcbb4e4$0$299$bed64819@news.gradwell.net>
Organization: Extreme Code Software (http://ex-code.com)
Subject: Re: Booch: iterator invalidation
Mime-Version: 1.0
X-Newsreader: knews 1.0b.1
Content-Type: text/plain; charset=us-ascii
X-URL: http://www.ex-code.com/
Message-ID: <3dd27f36$0$303$bed64819@news.gradwell.net>
NNTP-Posting-Date: 13 Nov 2002 16:35:02 GMT
NNTP-Posting-Host: 195.149.39.13
X-Trace: 1037205302 news.gradwell.net 303 mail2news/195.149.39.13
X-Complaints-To: news-abuse@gradwell.net
Xref: archiver1.google.com comp.lang.ada:30814
Date: 2002-11-13T16:35:02+00:00
List-Id: <comp.lang.ada>

In article <uel9p8qms.fsf@gsfc.nasa.gov>,
	Stephen Leake <stephen.a.leake.1@gsfc.nasa.gov> writes:
> porton@ex-code.com (Victor Porton) writes:
> 
>> >> type T is T_Internal(Use_Debug); -- Use_Debug is a Boolean _constant_
>> >> 
>> >> Will this not bring "additional debugging stuff" in the release
>> >> version (when Use_Debug=False)?
>> > 
>> > Now everything that uses T_Internal has to specify a Debug
>> > discriminant. To intrusive for my taste.
>> 
>> It is meant for user code to use _only_ T, not T_Internal.
>> (In OO style T_Internal should be in private section.)
> 
>> All compiler implementors should consider this to ensure that
>> they have zero space-efficiency.
> 
> I'm not clear what you mean here. I suppose if the compiler could
> prove that _every_ instance of T_Internal had the same value for
> Use_Debug, it could optimize stuff. But that seems like a lot of work.
> Any time T_Internal is passed as a subprogram parameter, you'd either
> have to inline the subprogram or do full data-flow analysis.

I meant the case when _all_ except of debug (like Dump, Check, 
Throw_If_Invalid) rountines use only T, not T_Internal.