[Boost-bugs] [Boost C++ Libraries] #3052: math::signbit fails to report -0

Subject: [Boost-bugs] [Boost C++ Libraries] #3052: math::signbit fails to report -0
From: Boost C++ Libraries (noreply_at_[hidden])
Date: 2009-05-19 19:41:49

#3052: math::signbit fails to report -0
-------------------------------------+--------------------------------------
 Reporter:  tegtmeye_at_[hidden]  |       Owner:  johnmaddock
     Type:  Bugs                     |      Status:  new        
Milestone:  Boost 1.40.0             |   Component:  math       
  Version:  Boost 1.38.0             |    Severity:  Problem    
 Keywords:                           |  
-------------------------------------+--------------------------------------
 math::signbit fails to report -0. Observed from boost::units, IEEE 754
 handling


 {{{
 #include <boost/math/special_functions/sign.hpp>

 #include <iostream>
 #include <math.h>

 int main(void)
 {
   float i=copysign(0.,-1.);
   float j=boost::math::copysign(0.,-1.);

   std::cout << "i: " << i << ", signbit: " << std::signbit(i) << "\n";
   std::cout << "j: " << j << ", signbit: " << boost::math::signbit(j) <<
 "\n";

   return 0;
 }
 }}}

-- 
Ticket URL: <https://svn.boost.org/trac/boost/ticket/3052>
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