Re: [Boost-users] Boost.Math pow and __int64

Subject: Re: [Boost-users] Boost.Math pow and __int64
From: gast128 (gast128_at_[hidden])
Date: 2010-09-28 14:08:47

John Maddock <boost.regex <at> virgin.net> writes:

> 
> > Not sure if this zero warning policy is in effect, but if so maybe Boost 
> > can
> > have a look at use of __int64 and pow (e.g. boost::math::pow<2, __int64> 
> > gives
> > a warning)?
> 
> Fixed in Trunk: please note that pow<2, __int64> returns double, the "fixed" 
> version performs calculations at double precision internally as well.  These 
> aren't intended as *integer* routines if that's what you're looking for...
> 
> HTH, John. 

Thx. We had that discussion here, that returning an integer would be more 
precise / faster, until somebody noticed that (32 bit) integers overflow very 
fast. So it is ok that integers are 'promoted' to double.

Btw nice addition this function. I think it's twice as fast as using std::pow 
using VStudio 2008.