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From: "Adam Beneschan" <adam@irvine.com>
Newsgroups: comp.lang.ada
Subject: Re: Unsigned Integer Restraint Errors
Date: 12 Mar 2007 13:07:41 -0700
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Date: 2007-03-12T13:07:41-07:00
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On Mar 12, 1:00 pm, "frikk" <frik...@gmail.com> wrote:
> On Mar 12, 2:11 pm, "frikk" <frik...@gmail.com> wrote:
>
>
>
> > On Mar 12, 1:23 pm, "Adam Beneschan" <a...@irvine.com> wrote:
>
> > > On Mar 12, 8:07 am, "frikk" <frik...@gmail.com> wrote:
>
> > > > LASTLY:
> > > > Please note that when I change the range value from 0 .. 5 to 0 ..
> > > > 2**64-1, or 0 .. UNSIGNED_LONG_INT'Last, there is no constraint error
> > > > raised. This is the same behavior as the first example.
>
> > > I missed this question the first time.
> > > [...]
>
> > >                                   -- Adam
>
> > Thanks for the answers Adam.  What you've said about the '-' makes
> > sense. I'll look into this.
>
> > The deal about how the constraint error being raised is outside the
> > scope of the procedure makes sense as well. I'll update my code to
> > reflect this.
>
> > So if I compile with gnato - should this fix my constraint error
> > raising? Basically I just need to be able to detect if the input is
> > outside the range - without using something like "if x < 0 or x >
> > 2**64 then" ...
>
> > Thank you everyone!
> > Blaine
>
> As it turns out, the example that I've posted works just fine when I
> use command line arguments:
>
> b := UNSIGNED_LONG_INT'VALUE(Argument(2));
>
> The constraint is thrown perfectly. I do this inside the procedure, of
> course, not in the declarations.
> Interesting eh?

Not unexpected, though.  As I said, something like -5 in an Ada
program is not a single number, but rather a unary operator "-"
applied to a numeric literal.  But in other cases, such as the
argument to a 'Value operation or when reading a number from a text
file with an instance of Text_IO.Integer_IO, "-" *is* considered part
of the number, and does not denote the unary "-" operator.  What I
said about "-" applies only in Ada source code.

                                 -- Adam