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=unavailable autolearn_force=no version=3.4.4
Path: 
 eternal-september.org!reader01.eternal-september.org!reader02.eternal-september.org!feeder.eternal-september.org!aioe.org!.POSTED!not-for-mail
From: "Dmitry A. Kazakov" <mailbox@dmitry-kazakov.de>
Newsgroups: comp.lang.ada
Subject: Re: Why stack can hold indefinite objects but records cannot?
Date: Tue, 28 Nov 2017 22:50:40 +0100
Organization: Aioe.org NNTP Server
Message-ID: <ovklng$1oja$1@gioia.aioe.org>
References: <ovkh24$1bh5$1@gioia.aioe.org> <ovki03$1fdr$1@gioia.aioe.org>
 <ovkkkc$1m51$1@gioia.aioe.org>
NNTP-Posting-Host: MajGvm9MbNtGBKE7r8NgYA.user.gioia.aioe.org
Mime-Version: 1.0
Content-Type: text/plain; charset=utf-8; format=flowed
Content-Transfer-Encoding: 7bit
X-Complaints-To: abuse@aioe.org
User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:52.0) Gecko/20100101
 Thunderbird/52.4.0
Content-Language: en-US
X-Notice: Filtered by postfilter v. 0.8.2
Xref: reader02.eternal-september.org comp.lang.ada:49224
Date: 2017-11-28T22:50:40+01:00
List-Id: <comp.lang.ada>

On 2017-11-28 22:31, Victor Porton wrote:

> But for the stack this is implemented.

No it is not. You must provide constraint. E.g.:

    X : String (1..80);

or

    X : String := "1234";


> I don't understand why the same cannot be done for records.
Records are just same:

    type Foo is record
       X : String (1..80);
    end record;

You cannot have unconstrained variables, members, objects. As I said, 
there is no such thing, and there cannot be. It is incomputable.

-- 
Regards,
Dmitry A. Kazakov
http://www.dmitry-kazakov.de