Re: [boost] [serialization] facets for non-finite numbers

From: Paul A Bristow (pbristow_at_[hidden])
Date: 2006-08-17 09:19:29

|  -----Original Message-----
|  From: boost-bounces_at_[hidden] 
|  [mailto:boost-bounces_at_[hidden]] On Behalf Of Andy Little
|  Sent: 17 August 2006 13:51
|  To: boost_at_[hidden]
|  Subject: Re: [boost] [serialization] facets for non-finite numbers
|  
|  
|  "Hubert Holin" <Hubert.Holin_at_[hidden]> wrote in message 
|  news:loom.20060817T140855-29_at_post.gmane.org...
|  > Johan Råde <rade <at> maths.lth.se> writes:
|  >
|  >>         Output is consistent with C99. (In particular, 
|  negative NaN is
|  >> written as "-nan".
|  >
|  > Paris (U.E.), le 17/08/2006
|  >
|  > Bonjour
|  >
|  > *Negative* Not-A-Number? What is such a beast, and what should
|  > it be used for?
|  
|  It suggests to me a saturation in the negative direction, 
|  IOW a number less than -std::numerics<T>::max().
|  
|  An example  use might be when you have an error integrator 
|  in a positional servo 
|  system, but I don't know if that is the effect here.

That is indeed the *intention* - but entirely USER-DEFINED and with NO MATH
MEANING.

NaNs are never > < or == anyway?

Paul

---
Paul A Bristow
Prizet Farmhouse, Kendal, Cumbria UK LA8 8AB
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