[Boost-bugs] [Boost C++ Libraries] #5931: numeric::interval equal comparison is strange

Subject: [Boost-bugs] [Boost C++ Libraries] #5931: numeric::interval equal comparison is strange
From: Boost C++ Libraries (noreply_at_[hidden])
Date: 2011-09-23 16:35:39

#5931: numeric::interval equal comparison is strange
---------------------------------------------+------------------------------
 Reporter:  Per Karlström <perk@…>           |       Owner:  bgubenko   
     Type:  Bugs                             |      Status:  new        
Milestone:  To Be Determined                 |   Component:  interval   
  Version:  Boost 1.47.0                     |    Severity:  Showstopper
 Keywords:                                   |  
---------------------------------------------+------------------------------
 I find that the interval operator== is somewhat strange. Either I have not
 got exactly how an interval equality operator is supposed to work. Or it
 is plain wrong. Anyway here is the offending code from
 boost/numeric/interval/interval.hpp lines 363 to 371

 template<class T, class Policies> inline
 bool interval<T, Policies>::operator== (const interval_holder& r) const
 {
   if (!checking::is_empty(low, up)) {
     if (up == r.low && low == r.up) return true;
     else if (up < r.low || low > r.up) return false;
   }
   throw interval_lib::comparison_error();
 }

 What surpprises me is how up is compared with r.low and low is comared
 with r.up

-- 
Ticket URL: <https://svn.boost.org/trac/boost/ticket/5931>
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