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From: Robert A Duff <bobduff@shell01.TheWorld.com>
Newsgroups: comp.lang.ada
Subject: Re: Dispatching callback handed over to C
Date: Sat, 07 Apr 2012 09:28:13 -0400
Organization: The World Public Access UNIX, Brookline, MA
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Date: 2012-04-07T09:28:13-04:00
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Simon Wright <simon@pushface.org> writes:

> Natasha Kerensikova <lithiumcat@gmail.com> writes:

> I think that must be it.

That's right.  If you're not doing anything with these things
on the C side, except copying the pointers around, then it's
fine to silence the warning.  Use the form of pragma Warnings(Off/On)
with a string around that one line of code, so you only silence
the one warning.

There's nothing wrong with silencing warnings when they are
false alarms, although it's a good idea to have a comment
explaining why.

>...I did wonder whether a classwide pointer might
> be a fat pointer, ...

GNAT never uses fat pointers for class-wide.  Fat pointers
are used only when the designated type is an unconstrained
array (and there are ways to get thin pointers for arrays).
I am ignoring access-to-subprogram, here.

- Bob