Re: [boost] [Math/nextafter] A question of naming functions...

From: John Maddock (john_at_[hidden])
Date: 2008-04-30 04:43:00

Johan Råde wrote:
> How did you implement these functions?
> Are they wrappers around functions provided by the compiler,
> or do you do some bit-twidling?

The current implementation uses only basic arithmetic operations and 
frexp/ldexp: 
http://svn.boost.org/trac/boost/browser/sandbox/math_toolkit/boost/math/special_functions/next.hpp 
but but there's scope to forward the implementations to native nextafter 
implementations where available.  So far I've only done this for msvc 
doubles by way of an experiment / sanity check.  There's no native or 
optimised version of edit_distance - I'm assuming this will used mostly in 
testing situations where out and out performance isn't so critical - which 
is just as well because the logic is rather complex :-(

Feel free to work your bit twiddling magic on these :-)

Regards, John.