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From: "frikk" <frikker@gmail.com>
Newsgroups: comp.lang.ada
Subject: Re: Unsigned Integer Restraint Errors
Date: 12 Mar 2007 12:13:26 -0700
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Date: 2007-03-12T12:13:26-07:00
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> The semantics you probably have implied is:
>
>     test : UNSIGNED_LONG_INT := UNSIGNED_LONG_INT (Integer'(-5));
>
> i.e. make *integer* -5 and convert it to test. This would indeed cause an
> error, as expected.
>
> >    package LONG_IO is new Modular_IO(UNSIGNED_LONG_INT);
> >    use LONG_IO;
>
> > begin
> >    Put("Minimum Value(uint64_t): ");
> >    Put(UNSIGNED_LONG_INT'FIRST);
> >    New_Line;
> >    Put("Maximum Value(uint64_t): ");
> >    Put(UNSIGNED_LONG_INT'LAST);
> >    New_Line;
>
> >    test := -5;
>
> This shall not raise Constraint_Error. The result should be 2**64 - 5, see
> RM 4.5.4.
>
> It seems that Windows GCC 3.4.6 for GNAT GPL 2006 (20060522) has a bug here
> for 2**64 modulus. With lesser modulus it works correct.
>
> --
> Regards,
> Dmitry A. Kazakovhttp://www.dmitry-kazakov.de

Thank you for the input. This leaves me with 2 questions:
1.  If my input is 2**35, wouldn't this still render the Integer type
inaccurate? The goal is to be able to use 64 bit integers... I'm
referring to your example of UNSIGNED_LONG_INT := UNSIGNED_LONG_INT
(Integer'(X));
2.  If this is a bug, then what kind of maximum input should I ask for
as a work around? I can try this on my mac when I get home...

Thanks
Blaine