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From: "Grein, Christoph" <christoph.grein@eurocopter.com>
Newsgroups: comp.lang.ada
Subject: Re: Anybody in US using ADA ? One silly idea..
Date: Fri, 17 Jan 2003 07:08:00 +0100 (MET)
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Date: 2003-01-17T07:08:00+01:00

> "Grein, Christoph" <christoph.grein@eurocopter.com> writes:
> 
> > > Which is easily solved by saying:
> > >      Lower : constant Integer := Read;
> > >      Upper : constant Integer := Read;
> > >      subtype S is Integer range Lower..Upper;
> > > 
> > > (Fortunately, declarations *are* elaborated in order :-)
> > 
> > which, by RM 3.3.1(7), is the same as
> > 
> >        Lower, Upper: constant Integer := Read;
> 
> Which is an excellent example of why declaring multiple initialized
> variables in one statement is a horrible thing to do. I'd have to
> check the manual to see if Read is called once or twice for this;
> please never do it!

You have a point in posing that plea. But what would you do in this case:

       Limits: constant array (1..1000) of Integer := (others => Read);

Do you also think Read is just called once?

And in the above, if you want Read to be called exactly once, you'd have to 
write

   Lower: constant Integer := Read;
   Upper: constant Integer := Lower;