Re: [boost] Math constants for naive and gurus? - which constants do you want?

From: Peter Dimov (pdimov_at_[hidden])
Date: 2001-10-24 13:37:36

From: "Noah Stein" <noah_at_[hidden]>
> > I don't really see what's wrong with the simple
> >
> > namespace math
> > {
> >     double const pi = 3.14159265358...;
> > }
>
> For me, it's an enormous burden.  I work on hardware that only supports
> floats.  I'd have to cast the constants every time I use them.

Why?

float const pi_f = math::pi;

> In addition to floats, though, I also used fixed point formats frequently,
> so a system that supports multiple type defintions for constants is a
great
> thing.  I'd have almost no option but to use a runtime conversion for a
> double constant to a fixed-point.  Maybe I'm being selfish, but I like the
> other way.  :)

Ditto:

fixed<16, 16> const pi_x16 = math::pi;

Dynamic init may be somewhat painful at times, I admit, but you can't expect
boost to generate the constants in every custom format, can you? It can only
provide a common framework into which you'd fill the constants in your fixed
point format.

What is the value of this framework?

--
Peter Dimov
Multi Media Ltd.