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From: "G.B." <bauhaus@futureapps.invalid>
Newsgroups: comp.lang.ada
Subject: Re: Quick question regarding limited type return syntax
Date: Mon, 04 Aug 2014 18:51:47 +0200
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Xref: number.nntp.dca.giganews.com comp.lang.ada:188148
Date: 2014-08-04T18:51:47+02:00
List-Id: <comp.lang.ada>

On 04.08.14 18:38, Dmitry A. Kazakov wrote:
> How can you call an operation of the type on an object of this type when
> the former is not yet operational?

In a way that is somewhat like you say, namely on a partial
object when it is needed only partially:

    T.comp_1: allocated and possibly initialized
    S.comp_2: not even allocated

    overriding
    procedure Foo (X : in out S) is
    begin
       null;
    end Foo;

may "validly" become:

   alloc	comp_1
   jump	s.foo

s.foo:
   ret

Lousy, but it may "work", even when, without optimization,
some "non-existing junk" is copied for X (if it's not by ref).
Not that I want that! Just imagine the outcome should the
arbitrary location happen to be volatile…