Re: [Boost-bugs] [Boost C++ Libraries] #6571: lexical_case<float>(someString) does not recognize IEEE exceptions

Subject: Re: [Boost-bugs] [Boost C++ Libraries] #6571: lexical_case<float>(someString) does not recognize IEEE exceptions
From: Boost C++ Libraries (noreply_at_[hidden])
Date: 2012-02-23 20:28:14

#6571: lexical_case<float>(someString) does not recognize IEEE exceptions
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  Reporter:  Chromatix <mhazadmanesh2009@…>          |       Owner:  apolukhin   
      Type:  Bugs                                    |      Status:  assigned    
 Milestone:  To Be Determined                        |   Component:  lexical_cast
   Version:  Boost 1.48.0                            |    Severity:  Problem     
Resolution:                                          |    Keywords:              
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Comment (by Chromatix <mhazadmanesh2009@…>):

 I'm not specifically speaking about '''-1.#IND'''. lexical_cast fails to
 convert '''-nan''' and '''inf''' from a string type to their floating
 point values too.

 If lexical_cast is able to successfully convert the double `undefined`
 value to its string representation (`-1.#IND`, `-nan`, etc) then it must
 also be able to do the vice versa without throwing errors, No?

 If you're wondering why it makes sense to implement such a conversion: I'm
 working on a program that frequently reads/writes double's to/from file.
 In the program calculations, sometimes undefined or infinity values are
 generated (which are fine and sometimes necessary in the program's logic).
 Now I have no problem saving them to disk (since '''{{{
 lexical_cast<string>(someUndefinedDouble) }}}''' works) but can't read
 them back (since e.g '''{{{ lexical_cast<double>("-nan") }}}''' fails).

-- 
Ticket URL: <https://svn.boost.org/trac/boost/ticket/6571#comment:5>
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