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From: "Steve Doiel" <nospam_steved94@attbi.com>
Newsgroups: comp.lang.ada
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 <u1yg5z3xo.fsf@gsfc.nasa.gov>
Subject: Re: Valid on QNaN generates exception, compiler bug?
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"Stephen Leake" <stephen.a.leake.1@gsfc.nasa.gov> wrote in message
news:u1yg5z3xo.fsf@gsfc.nasa.gov...
> "Steve Doiel" <nospam_steved94@attbi.com> writes:
>
> >   In ObjectAda 7.2 (WinNT x86) I have found that if I assign a value of
> > 16#FFC0_0000# (QNaN) to a 32 bit floating point value using unchecked
> > conversion, then I try to check the value using 'VALID, I get a
> > Constraint_Error, numeric overflow exception.
> >
> >   Is this a compiler bug?
>
> No. "NaN" stands for "Not a Number". float_value'Valid checks to see
> if 'float_value' holds a valid floating point number. It does not, so
> Constraint_Error is raised.
>
Interesting.  I expected float_value'Valid to return false, not raise an
exception.

SteveD

> --
> -- Stephe