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,FREEMAIL_FROM
	autolearn=unavailable autolearn_force=no version=3.4.4
X-Received: by 10.182.165.106 with SMTP id yx10mr27421530obb.33.1437948597793;
        Sun, 26 Jul 2015 15:09:57 -0700 (PDT)
X-Received: by 10.140.99.83 with SMTP id p77mr286851qge.3.1437948597651; Sun,
 26 Jul 2015 15:09:57 -0700 (PDT)
Path: 
 eternal-september.org!reader01.eternal-september.org!reader02.eternal-september.org!news.eternal-september.org!mx02.eternal-september.org!feeder.eternal-september.org!feeder.erje.net!us.feeder.erje.net!news.ripco.com!news.glorb.com!f3no3260790igg.0!news-out.google.com!4ni82268qgh.1!nntp.google.com!z61no3480619qge.0!postnews.google.com!glegroupsg2000goo.googlegroups.com!not-for-mail
Newsgroups: comp.lang.ada
Date: Sun, 26 Jul 2015 15:09:57 -0700 (PDT)
Complaints-To: groups-abuse@google.com
Injection-Info: glegroupsg2000goo.googlegroups.com;
 posting-host=81.203.145.32;
 posting-account=AFCLjAoAAABJAOf_HjgEEEi3ty-lG5m2
NNTP-Posting-Host: 81.203.145.32
User-Agent: G2/1.0
MIME-Version: 1.0
Message-ID: <ca22434f-8216-4cbd-a4c0-46fea8e6cc98@googlegroups.com>
Subject: What is the purpose of Vector.Query_Element?
From: EGarrulo <egarrulo@gmail.com>
Injection-Date: Sun, 26 Jul 2015 22:09:57 +0000
Content-Type: text/plain; charset=ISO-8859-1
Xref: news.eternal-september.org comp.lang.ada:27020
Date: 2015-07-26T15:09:57-07:00
List-Id: <comp.lang.ada>

The package that defines Vector provides this procedure:

procedure Query_Element
  (Container : in Vector;
   Index : in Index_Type;
   Process : not null access procedure (Element : in Element_Type));

Why is this procedure provided?  Isn't `Query_Element (Vector, Index, Process'Access)` the same as `Process (Element (Vector, Index))`?

Thank you.