Math float equivalence

[Lucas Goss]

Don Clugston wrote:
> 
> It stands for "relative floating point equality". If you have a better 
> name, let me know (I wrote it).
> 
>  > but I would think it would take a lot more processing than to just check
>  > equivalence.
> 
> Check the source in std.math. It's actually a very fast function (it 
> only has a couple of subtractions and two predictable branches).
> It's a comparison that exactly captures the precision of IEEE arithmetic.
> In the Helix library on dsource is a version which is more applicable to 
>  games, since it has an absolute difference as well.
> 

Ah, I take it you didn't like the name relativeFloatingPointEquality, 
haha, I guess that's understandable. Maybe something like 
"relativeEquality" would be nice, but I guess it's as short as possible 
because that's how mathematicians (I'm partially one) like it? Ever 
since using the Java and .NET libraries, I now loathe short names 
because it always seems to be more work to find what you're looking for 
or to understand something that's unfamiliar.

I looked at the std.math code and the feqrel does look pretty fast, I 
also looked at helix as well. I'll have to see what best fits my need.

Thanks,
Lucas