Re: [boost] Re: meta-double

From: Peder Holt (peder.holt_at_[hidden])
Date: 2005-06-10 13:44:55

On 6/9/05, Jonathan Wakely <cow_at_[hidden]> wrote:
> On Wed, Jun 08, 2005 at 05:20:26PM -0400, David Abrahams wrote:
> 
> > Peder Holt <peder.holt_at_[hidden]> writes:
> >
> > > On 6/8/05, David Abrahams <dave_at_[hidden]> wrote:
> > >> Peder Holt <peder.holt_at_[hidden]> writes:
> > >>
> > >>
> > >> Maybe I'm missing something obvious, but I don't see how any of this
> > >> leads to compile-time constants.  On a conforming compiler, a
> > >> calculation involving floating-point is not a compile-time constant.
> > >
> > > In that case VC7.1,VC8.0 beta and GCC3.2 got it wrong somewhere :)
> >
> > That's a known extension in vc7.1.  The head of the VC++ team himself
> > told me about it (his favorite unintentional extension, I think), and
> > told me it was gone in vc8.x, I'm pretty sure.  I'm surprised to hear
> > that it works for you there.  Can't speak for GCC.
> 
> This was an undocumented extension that has been deprecated in GCC 4
> 
> c.f. http://gcc.gnu.org/ml/gcc/2005-01/msg01744.html
> and the last two items here:
> http://gcc.gnu.org/onlinedocs/gcc-4.0.0/gcc/Deprecated-Features.html#Deprecated-Features

Oh, well. Anyway, I have now uploaded a version of this to the vault:
metamath.zip
that is mpl-compliant and supports comparison and arithmetics with the
same accuracy as normal double arithmetics. Does not support NaN.

Regards,
Peder

> jon
> 
> --
> "We're doomed!"
>         - C3PO
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