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

From: Paul A Bristow (pbristow_at_[hidden])
Date: 2006-08-01 07:42:35

For the record, as a punishment for raising this issue at the UK C++ BSI
group meeting, I was tasked with raising the issue for the C++ Standards
group.

Some rambling thoughts on this issue are at

http://www2.open-std.org/JTC1/SC22/WG21/docs/papers/2006/n2022.pdf 

Your implementation almost certainly provides a 'proof_of_concept' for this
- as if it was needed.

And I suspect more than a few will be well advised to use it - otherwise
they may find to their cost (possibly considerable cost) that some archives
turn out to be not readable because some floating-point calculation has
produced an infinity or NaN.

If you don't do this, it would seem prudent to ensure that every
floating-point serialized is checked for finiteness before writing to the
archive, and worrying about what to do it any are not!

Thanks.

Paul

---
Paul A Bristow
Prizet Farmhouse, Kendal, Cumbria UK LA8 8AB
[phone] & SMS, Mobile [phone] & SMS
pbristow_at_[hidden]
 
|  -----Original Message-----
|  From: boost-bounces_at_[hidden] 
|  [mailto:boost-bounces_at_[hidden]] On Behalf Of Johan Råde
|  Sent: 30 July 2006 11:02
|  To: boost_at_[hidden]
|  Subject: Re: [boost] [serialization] facets for non-finite numbers
|  
|  Robert Ramey wrote:
|  > Johan Råde wrote:
|  >> Johan Råde wrote:
|  >>> At the suggestion of Robert Ramey's, I have put together 
|  facets for
|  >>> reading and writing non-finite numbers, such as infinity and
|  >>> not-a-number, to text streams, in a consistent and portable way.
|  >>>
|  >>> If there is enough interest in the code, I will submit it for a
|  >>> mini-review, in order to have it added to the serialization lib.
|  >>>
|  > 
|  > Actually, I would like the other codecvt facets in boost 
|  be promoted
|  > to official status.  There should be a "place" in boost 
|  for these and
|  > other facets.
|  > 
|  > Robert Ramey
|  > 
|  > 
|  >>> --Johan Råde
|  >>
|  >> New version uploaded to the vault,
|  >> serialization/non_finite_num_facets.zip. This version has:
|  >>
|  >> 1. better handling of fomatting flags
|  >> 2. more robust check for not-a-number
|  >> 3. more tests
|  >> 4. some minor issues have been fixed
|  >> 5. various code improvements
|  >>
|  >> Now I'm not going to make any more changes for a while.
|  >> Got other things to do.
|  >>
|  >> --Johan Råde
|  >>
|  >> _______________________________________________
|  >> Unsubscribe & other changes:
|  >> http://lists.boost.org/mailman/listinfo.cgi/boost 
|  > 
|  > 
|  > 
|  > 
|  > 
|  -------------------------------------------------------------
|  -----------
|  > 
|  > _______________________________________________
|  > Unsubscribe & other changes: 
|  http://lists.boost.org/mailman/listinfo.cgi/boost
|  
|  I think there should be a Boost facets library,
|  with the UTF-8 codecvt facet and my non-finite number facets.
|  There is no reason why they should be buried in the 
|  serialization library.
|  
|  But I'm not the right person to take care of that.
|  My area is scientific computing and GUI programming,
|  and I know almost nothing about locales, facets and 
|  internationalization.
|  
|  --Johan Råde
|  
|  
|  _______________________________________________
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|  http://lists.boost.org/mailman/listinfo.cgi/boost
|