Re: [boost] [serialization]Serialisation/deserialisationoffloating-point values

From: Paul A Bristow (pbristow_at_[hidden])
Date: 2006-05-02 12:26:44

IMO The real issue here is not whether round-tripping should work, but that
input   from a long enough decimal digit string should always give you the
nearest floating-point representation.

For float this is true, and for double is almost (but not quite) true.

Paul

---
Paul A Bristow
Prizet Farmhouse, Kendal, Cumbria UK LA8 8AB
[phone] & SMS, Mobile [phone] & SMS
 
|  -----Original Message-----
|  From: boost-bounces_at_[hidden] 
|  [mailto:boost-bounces_at_[hidden]] On Behalf Of Sebastian Redl
|  Sent: 02 May 2006 15:55
|  To: boost_at_[hidden]
|  Subject: Re: [boost] 
|  [serialization]Serialisation/deserialisationoffloating-point values
|  
|  Paul A Bristow wrote:
|  
|  >The Standard is imprecise on this issue, but I feel it is a 
|  very poor 
|  >do that such a bizarre small range of values should be wrong.
|  >
|  >Feels like an off-by-one rounding bug to me.
|  >  
|  >
|  I tend to agree with the MS engineers here. I've found out 
|  only yesterday that the FPU/math library is not entirely 
|  deterministic in some calculations (including square roots 
|  and trigonometry, typical 3d stuff), so I think worrying 
|  about serialization/deserialization is useless.
|  
|  Sebastian Redl
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