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From: "Martin Dowie" <martin.dowie@btopenworld.com>
Newsgroups: comp.lang.ada
Subject: Re: Modes (was unbounded_string)
Date: Fri, 10 Oct 2003 16:21:17 +0000 (UTC)
Organization: BT Openworld
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 <uzng9f7ej.fsf@nasa.gov>
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Date: 2003-10-10T16:21:17+00:00
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"Stephen Leake" <Stephe.Leake@nasa.gov> wrote in message
news:uzng9f7ej.fsf@nasa.gov...
> Tagged types and full limited types are always passed by reference,
> because it almost always matters for them.

Also, tagged types are almost certainly 2 words+ in size (word <=> 32-bits).
Even
in Ada83 (at least in any implementation I saw) types of this size (or
greater) were
always passed by reference, for efficiency, though the standard didn't
mandate it.