Re: [Boost-bugs] [Boost C++ Libraries] #7785: karma real generator limits precision to digits10 no matter exponent

Subject: Re: [Boost-bugs] [Boost C++ Libraries] #7785: karma real generator limits precision to digits10 no matter exponent
From: Boost C++ Libraries (noreply_at_[hidden])
Date: 2012-12-13 12:44:11

#7785: karma real generator limits precision to digits10 no matter exponent
-------------------------------+--------------------------------------------
  Reporter:  strk@…            |       Owner:  djowel 
      Type:  Bugs              |      Status:  new    
 Milestone:  To Be Determined  |   Component:  spirit 
   Version:  Boost 1.52.0      |    Severity:  Problem
Resolution:                    |    Keywords:         
-------------------------------+--------------------------------------------

Comment (by Sandro Santilli <strk@…>):

 The problem is in call_n, where fractional part is normalized even if the
 format flag is
 requesting fixed precision, despite the comment above (saying
 normalization is only needed for scientific notation).

 This patch would fix my case:

 {{{
 --- real_utils.hpp.000  2012-12-13 13:42:01.000000000 +0100
 +++ real_utils.hpp      2012-12-13 13:43:02.000000000 +0100
 @@ -85,5 +85,5 @@
              // get correct precision for generated number
              unsigned precision = p.precision(n);
 -            if (std::numeric_limits<U>::digits10)
 +            if (std::numeric_limits<U>::digits10 &&
 !(Policies::fmtflags::fixed & flags))
              {
                  // limit generated precision to digits10, if defined
 }}}

-- 
Ticket URL: <https://svn.boost.org/trac/boost/ticket/7785#comment:3>
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