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!gandalf.srv.welterde.de!news.jacob-sparre.dk!franka.jacob-sparre.dk!pnx.dk!.POSTED.rrsoftware.com!not-for-mail
From: "Randy Brukardt" <randy@rrsoftware.com>
Newsgroups: comp.lang.ada
Subject: Re: Returning a limited object as a class-wide value
Date: Wed, 29 Nov 2017 14:51:29 -0600
Organization: JSA Research & Innovation
Message-ID: <ovn6ki$r7l$1@franka.jacob-sparre.dk>
References: <ovl4m6$k5s$1@gioia.aioe.org>
Injection-Date: Wed, 29 Nov 2017 20:51:30 -0000 (UTC)
Injection-Info: franka.jacob-sparre.dk;
 posting-host="rrsoftware.com:24.196.82.226";
	logging-data="27893"; mail-complaints-to="news@jacob-sparre.dk"
X-Priority: 3
X-MSMail-Priority: Normal
X-Newsreader: Microsoft Outlook Express 6.00.2900.5931
X-RFC2646: Format=Flowed; Original
X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.7246
Xref: reader02.eternal-september.org comp.lang.ada:49262
Date: 2017-11-29T14:51:29-06:00
List-Id: <comp.lang.ada>

"Victor Porton" <porton@narod.ru> wrote in message 
news:ovl4m6$k5s$1@gioia.aioe.org...
> Let T be a limited tagged type.
>
> I want to define a function F which returns T'Class.
>
> Please show me an example.
>
> I try:
>
> return X: T'Class := T'(others => <>) do
>   --- ...
> end return;
>
> Right way?

Ignoring Dmitry's typical rant, I believe this is correct. You are making a 
new object this way (as copying of limited objects is banned -- that's the 
point).

Remember that a limited function can only be used to initialize a limited 
object or used for a very short lifetime. That's usually enough. You can 
compose limited objects this way, as well, so long as it is used in a 
limited aggregate or function return.

But remember that "limited" is, well, limited for a reason. So there are 
definitely things that can't be done that way.

                                          Randy.