Re: [boost] Boost.Preprocessor - High-Precision Arithmetic Query

From: Victor A. Wagner, Jr. (vawjr_at_[hidden])
Date: 2002-10-19 14:23:09

At Saturday 2002/10/19 11:41, you wrote:

>----- Original Message -----
>From: "Victor A. Wagner, Jr." <vawjr_at_[hidden]>
>
>
> > <only slightly jesting>
> > you left out "the C way"
> > 4) just do modular arithmetic and leave it up to the programmer to "know"
> > what's wrong
> >
> > or as Scott Meyers keeps saying (I paraphrase) "When in doubt, do what int
> > does"
> > </only slightly jesting>
> >
> > I don't have a good answer here.
> > Most computers (that I've played with over the years) gave the answer
> > modulo (max value + 1) and a flag (or trap) commonly called overflow.
> > Most HLLs just give answer modulo (max value +1) and no way to even detect
> > overflow.
> > IMO, you're breaking new ground here (unfortunately)
>
>1. AFAIK, what you are saying is implementation defined
>2. There's a reason why modulo is not an option (sloooow, if I'm not mistaken)

if it's so sloooooow, why do all the 2's complement computers do it by default?

>3. Boost PP *IS* breaking new ground
>
>Again 2c worth.
>--Joel
>
> > At Saturday 2002/10/19 10:22, you wrote:
> > >----- Original Message -----
> > >From: "Joel de Guzman" <djowel_at_[hidden]>
> > >
> > > > > 1) return a known (and detectable) error state
> > > > > 2) saturate at the greatest value
> > > > > 3) cause a glorious preprocessor failure
> > > >
> > > > Hi,
> > > >
> > > > Definitely 2.
> > > >
> > > > 2c worth
> > > > --Joel
> > >
> > >That's what I'm leaning toward as well.  Thanks for the 2c Joel.
> > >
> > >Paul Mensonides
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> > Victor A. Wagner Jr.      http://rudbek.com
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Victor A. Wagner Jr.      http://rudbek.com
PGP RSA fingerprint = 4D20 EBF6 0101 B069 3817 8DBF C846 E47A
PGP D-H fingerprint = 98BC 65E3 1A19 43EC 3908 65B9 F755 E6F4 63BB 9D93
The five most dangerous words in the English language:
               "There oughta be a law"