Re: [boost] compile time version of double

From: Peder Holt (peder.holt_at_[hidden])
Date: 2005-07-20 04:14:32

On 7/18/05, Andy Little <andy_at_[hidden]> wrote:
> 
> "Peder Holt" <peder.holt_at_[hidden]> wrote
> 
> >> What does the following from your original post mean in more detail?:
> >>
> >> "BOOST_DOUBLE is a non-compliant macro that relies on compile time
> >> behaviour of floating operations."
> >>
> >> Does rthis mean that it only works on a few non-compliant compilers?
> >>
> > It works on all VC versions, on all GCC versions up to 4.0, on Comeau
> > in relaxed mode, and on the borland compiler. (Probably more as well,
> > but those are the ones I have tested)
> 
> The crucial question though is whether it is conforming C++ ?., or is it using
> non-standarad techniques, such as compile time addition of float and int as I
> believe happens in  VC7.1.

the BOOST_DOUBLE macro. relies on non-conforming C++. The
implementation of double_ on the other hand is conforming C++. This is
why I also supplied the string_c_to_double template, which is a
conforming way to create a compile time double.

Peder

> 
> Andy Little
> 
> 
> 
> 
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