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!.POSTED!not-for-mail
From: "Jeffrey R. Carter" <spam.jrcarter.not@spam.not.acm.org>
Newsgroups: comp.lang.ada
Subject: Re: limited agregate and limited components default initialization
Date: Tue, 3 Apr 2018 19:01:40 +0200
Organization: Also freenews.netfront.net; news.tornevall.net;
 news.eternal-september.org
Message-ID: <pa0c1l$3se$1@dont-email.me>
References: <e1e73838-2e45-4f53-9cbf-e28e85100fd1@googlegroups.com>
 <p9qn3h$1fts$1@gioia.aioe.org>
 <29943b13-00d1-443a-82f2-f55272770109@googlegroups.com>
 <12766e64-7641-45a0-8e76-8330a3b3c101@googlegroups.com>
 <p9rj2t$td5$1@gioia.aioe.org> <p9s8vg$mvn$1@franka.jacob-sparre.dk>
 <d83d9dd1-3674-4299-ac9c-1bf5862ae0e2@googlegroups.com>
 <p9u7rm$23q$1@franka.jacob-sparre.dk>
Mime-Version: 1.0
Content-Type: text/plain; charset=utf-8; format=flowed
Content-Transfer-Encoding: 7bit
Injection-Date: Tue, 3 Apr 2018 17:01:41 -0000 (UTC)
Injection-Info: reader02.eternal-september.org;
 posting-host="6294fd639b54ae015ad3af8cd51aef87";
	logging-data="3982"; mail-complaints-to="abuse@eternal-september.org";
	posting-account="U2FsdGVkX1/eNnEDgQCBXTDkovbkk+MKpRON/vkEaGM="
User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101
 Thunderbird/52.7.0
In-Reply-To: <p9u7rm$23q$1@franka.jacob-sparre.dk>
Content-Language: en-US
Cancel-Lock: sha1:QOeDjNgY98Afnpi/TUWQS1GxT14=
Xref: reader02.eternal-september.org comp.lang.ada:51318
Date: 2018-04-03T19:01:40+02:00
List-Id: <comp.lang.ada>

> "Jean-Claude Rostaing" <00120260a@gmail.com> wrote in message
> news:d83d9dd1-3674-4299-ac9c-1bf5862ae0e2@googlegroups.com...
>
> Shouldn't the expression
> function
> function GET (Pointer : Pointer_Type) return Accessor_Type is
>      (if Pointer.Pointer = null or else POINTER.Pointer.Value = null then
> raise EXC_NULL_POINTER_ACCESS
>       else ACCESSOR_TYPE'(Data_Link => Pointer.Pointer.Value));
> be strictly equivalent to
> function GET (Pointer : Pointer_Type) return Accessor_Type is
>    begin
>       if Pointer.Pointer = null or else POINTER.Pointer.Value = null then
> raise EXC_NULL_POINTER_ACCESS;
>       else
>          return ACCESSOR_TYPE'(Data_Link => Pointer.Pointer.Value);
>       end if;
>    end GET;

Technically, the expression function is equivalent to

function Get (Pointer : Pointer_Type) return Accessor_Type is
begin
    return (if Pointer.Pointer = null or else POINTER.Pointer.Value = null then
               raise EXC_NULL_POINTER_ACCESS
            else ACCESSOR_TYPE'(Data_Link => Pointer.Pointer.Value));
end Get;

so it would be interesting to see what that does. I don't see any reason why 
your non-expression version wouldn't also be equivalent, too, though.

-- 
Jeff Carter
"[A] brilliant military career that after thirty
years catapulted him to the rank of corporal."
Take the Money and Run
138