From: "Randy Brukardt" <randy@rrsoftware.com>
Subject: Re: Generic instantiation before actual subprogram body
Date: Thu, 4 Dec 2014 16:49:53 -0600
Date: 2014-12-04T16:49:53-06:00 [thread overview]
Message-ID: <m5qoeh$d2m$1@loke.gir.dk> (raw)
In-Reply-To: wccegsfwh2j.fsf@shell01.TheWorld.com
"Robert A Duff" <bobduff@shell01.TheWorld.com> wrote in message
news:wccegsfwh2j.fsf@shell01.TheWorld.com...
> Natasha Kerensikova <lithiumcat@instinctive.eu> writes:
...
> If you avoid anonymous access types, you won't get dynamic accessibility
> checks. You might get compile-time errors when doing 'Access, but
> that's just an annoyance -- it won't cause bugs. So yes, I think
> you're being "superstitious". ;-)
That's not quite true, in that (some?) accessibility checks in generic
bodies are (formally) dynamic checks. GNAT can (and most likely does, I
didn't try it) warn on such errors (since it expands bodies), but they're
still runtime errors (the program can be executed and it would raise
Program_Error). You don't need any anonymous access types to trigger those
checks.
The check in question is 3.10.2(29), and the AARM note 3.10.2(29.a/2)
mentions instance bodies specifically.
Since the OP's question is related to generics, this is potentially
significant (although I think in practice it won't matter).
Randy.
prev parent reply other threads:[~2014-12-04 22:49 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-12-04 8:48 Generic instantiation before actual subprogram body Natasha Kerensikova
2014-12-04 9:31 ` J-P. Rosen
2014-12-04 10:03 ` Natasha Kerensikova
2014-12-04 10:40 ` Georg Bauhaus
2014-12-04 14:12 ` J-P. Rosen
2014-12-04 15:34 ` Robert A Duff
2014-12-04 15:49 ` Robert A Duff
2014-12-04 22:49 ` Randy Brukardt [this message]
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