From mboxrd@z Thu Jan  1 00:00:00 1970
X-Spam-Checker-Version: SpamAssassin 3.4.5-pre1 (2020-06-20) on
	ip-172-31-74-118.ec2.internal
X-Spam-Level: 
X-Spam-Status: No, score=-1.9 required=3.0 tests=BAYES_00 autolearn=ham
	autolearn_force=no version=3.4.5-pre1
Path: eternal-september.org!reader02.eternal-september.org!.POSTED!not-for-mail
From: "Jeffrey R. Carter" <spam.jrcarter.not@spam.not.acm.org>
Newsgroups: comp.lang.ada
Subject: Re: Performance of records with variant parts
Date: Mon, 22 Mar 2021 18:32:37 +0100
Organization: Also freenews.netfront.net; news.tornevall.net;
 news.eternal-september.org
Message-ID: <s3akbl$dg3$1@dont-email.me>
References: <07a56dcc-9e17-49b2-a980-3a5a2d265cedn@googlegroups.com>
Mime-Version: 1.0
Content-Type: text/plain; charset=utf-8; format=flowed
Content-Transfer-Encoding: 7bit
Injection-Date: Mon, 22 Mar 2021 17:32:37 -0000 (UTC)
Injection-Info: reader02.eternal-september.org; posting-host="b53df4a440428053084cdf916ac37f08";
	logging-data="13827"; mail-complaints-to="abuse@eternal-september.org";	posting-account="U2FsdGVkX1+DOFKqgXUikpyCzlFCnLOVPhA830yc+00="
User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101
 Thunderbird/78.7.1
Cancel-Lock: sha1:yS0kpRq7ogkJhQ2muGM0FnopJnA=
In-Reply-To: <07a56dcc-9e17-49b2-a980-3a5a2d265cedn@googlegroups.com>
Content-Language: en-US
Xref: reader02.eternal-september.org comp.lang.ada:61628
List-Id: <comp.lang.ada>

On 3/22/21 6:02 PM, John Perry wrote:
> 
> |       case obj.kind is
> |       when Sphere =>
> |          -- do stuff
> |       when Plane =>
> |          -- do other stuff
> |       when None =>
> |          null;
> |       end case;
> 
> Is there a reason that the record with variant parts runs so much slower? I can make the complete source available if need be.

1. Why is Surface a discriminant?
2. What are the quantitative timing requirements for the program? Does the 
difference affect whether or not they are met?
3. What is the declaration of Obj?

-- 
Jeff Carter
"One day he told me he was a gynecologist. He
couldn't speak no foreign languages."
Take the Money and Run
147