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From: Stephen Leake <stephen_leake@acm.org>
Newsgroups: comp.lang.ada
Subject: Re: In-Out Parameters for functions
Date: 27 Jan 2004 17:38:54 -0500
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Date: 2004-01-27T17:38:54-05:00

"Alexandre E. Kopilovitch" <aek@VB1162.spb.edu> writes:

> Stephen Leake wrote:
> 
> > > Look at this formulae:
> > > 
> > >   F(A) + G(A);
> > > 
> > > If F is permitted to change value of A then the result of the
> > > formulae may depend on order of computation. And this is
> > > obviously dangerous, because the formulae looks as typical
> > > mathematical expression, where this effect usually is not
> > > anticipated.
> >
> > Hmm. Let F be Sqrt (Ada.Numerics.Float_Random.Random), and G be
> > Ada.Numerics.Float_Random.Random. Then we see that Ada _requires_ the
> > behavior you are describing. So it's clearly a Good Thing :).
> 
> "Random" is very special case, in which an intention is quite
> opposite to what is common in normal "regular" circumstances. 

Ok, fine. What is wrong with using mode "in out" for functions in
special cases?

-- 
-- Stephe