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From: Robert A Duff <bobduff@shell01.TheWorld.com>
Newsgroups: comp.lang.ada
Subject: Re: Legit Warnings or not
Date: Thu, 28 Jul 2011 10:22:28 -0400
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Date: 2011-07-28T10:22:28-04:00
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"Dmitry A. Kazakov" <mailbox@dmitry-kazakov.de> writes:

> On Wed, 27 Jul 2011 19:37:55 -0500, Randy Brukardt wrote:

>> All of the other things are high-level concepts which work the same whether 
>> or not the objects are contiguous. ":=" and "=" are defined in terms of the 
>> subcomponents,
>
> which is ambiguous when components are referential. Does ":=" copy the
> reference or the target object?

There's no ambiguity.  "X := Y;" copies all components of Y.
If the compiler chooses to implement some of those components
via some sort of indirection, then ":=" will need to do a deep copy,
in general.

The indirection must be invisible (except, as you mentioned, for
low-level stuff like 'Size and Unchecked_Conversion).

- Bob