Re: [Boost-users] Ann: Floating Point Utilities Review starts today

From: Matt Gruenke (mgruenke_at_[hidden])
Date: 2008-03-04 14:26:17

I know it's getting pretty far afield, but this reminds me of a floating 
point enumerator I once wrote, in order to test various numeric 
optimizations by perfect induction.  It works much like an iterator, and 
can be used to cover all valid float values in a given range.  Would 
there be interest in something like that?

Again, sorry to follow a tangent, but another floating point utility 
I've found useful is an epsilon function.  Unlike 
std::numeric_limits<>::epsilon(), it takes an argument.  It also returns 
1, for integral types (this is USEFUL - why doesn't the standard 
library's?!?).

Matt

Robert Kindred wrote:
>>> Just a quick reply: Is there any plans to include efficient comparison
>>> (equality) of floating point numbers? I could not find anything
>>> related in the library docs.
>>>
>>> Hermann O. Rodrigues
>>>       
>> No.
>>
>> --Johan
>>     
>
> I would like to second this motion, as there are many pitfalls in doing this 
> manually.  Here is a link I found on the pitfalls involved and ways to solve 
> them:
>
> http://www.cygnus-software.com/papers/comparingfloats/comparingfloats.htm
>
>
> Robert Kindred 
>
>
>
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