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Newsgroups: comp.lang.ada
Subject: Re: Translating an embedded C algorithm
From: Georg Bauhaus <bauhaus@arcor.de>
In-Reply-To: <874pqqd2ly.fsf@ludovic-brenta.org>
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Date: Wed, 17 Jan 2007 21:22:53 +0100
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Date: 2007-01-17T21:20:39+01:00
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On Tue, 2007-01-16 at 23:32 +0100, Ludovic Brenta wrote:
> Georg Bauhaus <bauhaus@arcor.de> writes:
> >On Tue, 2007-01-16 at 08:12 -0800, Ludovic Brenta wrote:
> [...]
> >> if (a = 1, b = a, c = --a, (a = --b) == c) {
> >>    ...
> >> }
> >>
> >> Ah, the joy of obfuscated programming :) :) :)
> >> Obfuscuation in this style is quite possible in Ada, too,
> >
> > including side effects. This is from a legal program:
> >
> >    if (a = 1, b = a) = T' (c = -a, (a = -b) =- c) then
> >       null;
> >    end if;
> >
> > Hint: the parentheses are needed :)
> 
> Including the side effects?  All I see are two aggregates for a
> hypothetical "type T is array (Positive range <>) of Boolean", but
> where are the assignments to a, b and c?  And where are the decrements
> of a and b?

The assignments happen in the body of
  function "-"(x: Integer) return Boolean;
which is defined at the same level as a, b, and c.