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

Subject: [Boost-bugs] [Boost C++ Libraries] #7785: karma real generator limits precision to digits10 no matter exponent
From: Boost C++ Libraries (noreply_at_[hidden])
Date: 2012-12-11 10:51:30

#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
 Keywords:                    |  
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 The real_inserter::call_n method here is limiting the user-provided
 precision by the
 http://svn.boost.org/svn/boost/trunk/boost/spirit/home/karma/numeric/detail/real_utils.hpp


 But that value is later used to determine how many decimal digits to
 print, independently on where the first non-zero digit is. This means
 overlimiting the actual number of significant digit for no evident reason.

 The user provided ::precision() function has access to the full number and
 thus can judge when to provide more or less precision depending on
 magnitude. Why not trusting that ?

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Ticket URL: <https://svn.boost.org/trac/boost/ticket/7785>
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