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From: Adam Beneschan <adam@irvine.com>
Newsgroups: comp.lang.ada
Subject: Re: subprogram must not be deeper than access type
Date: Mon, 3 Oct 2011 16:39:22 -0700 (PDT)
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Date: 2011-10-03T16:39:22-07:00
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On Oct 3, 4:30=A0pm, Yannick Duch=EAne (Hibou57)
<yannick_duch...@yahoo.fr> wrote:
> Le Sun, 25 Sep 2011 16:04:42 +0200, Oliver Kleinke =A0
> <oliver.klei...@c-01a.de> a =E9crit:
>
> > Hi,
>
> > I am unsure but you might want to try it using an anonymous access to
> > subprogram type, as described here
> > ('05 Rationale, 3.4 - Downward Closures)
> >http://www.adaic.org/resources/add_content/standards/05rat/html/Rat-3...
>
> There are things I did not understand.
>
> > Ada 2005 overcomes the problem by introducing anonymous access to
> > subprogram types. This was actually considered during the design of
> > Ada 95 but it was not done at the time for two main reasons. Firstly,
> > the implementation problems for those who were using display vectors
> > rather than static links were considered a hurdle.
>
> Display vectors ?

This might help:

http://en.wikipedia.org/wiki/Call_stack

                  -- Adam