[Boost-bugs] [Boost C++ Libraries] #12112: cpp_dec_float: assigning double(-infinity) drops the negative

Subject: [Boost-bugs] [Boost C++ Libraries] #12112: cpp_dec_float: assigning double(-infinity) drops the negative
From: Boost C++ Libraries (noreply_at_[hidden])
Date: 2016-04-05 01:54:23

#12112: cpp_dec_float: assigning double(-infinity) drops the negative
-----------------------------------------+----------------------------
 Reporter:  Jason Rhinelander <jason@…>  |      Owner:  johnmaddock
     Type:  Bugs                         |     Status:  new
Milestone:  To Be Determined             |  Component:  multiprecision
  Version:  Boost 1.60.0                 |   Severity:  Problem
 Keywords:                               |
-----------------------------------------+----------------------------
 Initializing (or assigning) negative infinity to a cpp_dec_float assigns
 positive infinity instead of negative infinity.

 The problem seems to be that cpp_dec_float.hpp, in operator=(long double
 a), does:

 {{{
    if((boost::math::isinf)(a))
       return *this = inf();
 }}}

 but I think that should instead be (I have not tested this):

 {{{
     if((boost::math::isinf)(a)) {
        *this = inf();
        if (a < 0) negate();
        return *this;
     }
 }}}

-- 
Ticket URL: <https://svn.boost.org/trac/boost/ticket/12112>
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