[boost] Réf. : Re: [format] - exponential format, NaN and infinity

From: frederic.bron_at_[hidden]
Date: 2007-03-15 10:09:11

I have tried the floating_point_utilities_v2 which is very good for inf and nan. Thanks! Why isn't it part of boost?
However, there is still the problem with the number of digits in the exponent: 2 with unix/cygwin (1e12) and 3 with windows (1e012).

Regards,

F. Bron
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Frédéric Bron (frederic.bron_at_[hidden])
Unité ALT, Alcan CRV, BP 27, 38341 Voreppe
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                      Jeff Garland                                                                                                          
                      <jeff_at_crystalclearso        Pour :    boost_at_[hidden]                                                           
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frederic.bron_at_[hidden] wrote:
> This is about output of real values (float, double, ...) in exponential
> format and output of not a number and infinity.
> My concern is that in C++, the output differs from one compiler/machine to
> another. It would be very nice if boost::format could garantee the same
> output on every computer.

I'm not 100% sure this will solve your problem, but you should have a look at
the floating_point_utils from Johan Rade with help from John Maddock and
others.  You can find it in the vault here

http://boost-consulting.com/vault/index.php?&direction=0&order=&directory=Math%20-%20Numerics

It's not an official lib yet, but I believe it's been testing on a whole bunch
of compilers and platforms.  There's a long discussion of this in the mail
archive -- look for 'fpclassify' on this page:

http://lists.boost.org/Archives/boost/2006/12/index.php

HTH,

Jeff
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