[Boost-bugs] [Boost C++ Libraries] #6297: Warning under VC

Subject: [Boost-bugs] [Boost C++ Libraries] #6297: Warning under VC
From: Boost C++ Libraries (noreply_at_[hidden])
Date: 2011-12-19 15:57:10

#6297: Warning under VC
------------------------------+---------------------------------------------
 Reporter:  apolukhin         |       Owner:  dgregor 
     Type:  Feature Requests  |      Status:  new     
Milestone:  To Be Determined  |   Component:  numeric 
  Version:  Boost 1.48.0      |    Severity:  Cosmetic
 Keywords:                    |  
------------------------------+---------------------------------------------
 Warning text:[[BR]]
 c:\test\boost\boost\numeric\conversion\detail\converter.hpp(166) : warning
 C4800: 'int' : forcing value to bool 'true' or 'false' (performance
 warning)
         c:\test\boost\boost\numeric\conversion\detail\converter.hpp(165) :
 while compiling class template member function
 'boost::numeric::range_check_result
 boost::numeric::convdetail::GT_HiT<Traits>::apply(bool)'
         with
         [
             Traits=conv_traits
         ]
         c:\test\boost\boost\numeric\conversion\detail\converter.hpp(236) :
 see reference to class template instantiation
 'boost::numeric::convdetail::GT_HiT<Traits>' being compiled
         with
         [
             Traits=conv_traits
         ]
         c:\test\boost\boost\numeric\conversion\detail\converter.hpp(288) :
 see reference to class template instantiation
 'boost::numeric::convdetail::combine<PredA,PredB>' being compiled
         with
         [
             PredA=boost::numeric::convdetail::non_applicable,
             PredB=boost::numeric::convdetail::GT_HiT<conv_traits>
         ]
         c:\test\boost\boost\numeric\conversion\detail\converter.hpp(287) :
 while compiling class template member function
 'boost::numeric::range_check_result
 boost::numeric::convdetail::generic_range_checker<Traits,IsNegOverflow,IsPosOverflow,OverflowHandler>::out_of_range(bool)'
         with
         [
             Traits=conv_traits,
             IsNegOverflow=boost::numeric::convdetail::non_applicable,
             IsPosOverflow=boost::numeric::convdetail::GT_HiT<conv_traits>,
 OverflowHandler=boost::numeric::numeric_cast_traits<int,bool>::overflow_policy
         ]
         c:\test\boost\boost\numeric\conversion\detail\converter.hpp(508) :
 see reference to class template instantiation
 'boost::numeric::convdetail::generic_range_checker<Traits,IsNegOverflow,IsPosOverflow,OverflowHandler>'
 being compiled
         with
         [
             Traits=conv_traits,
             IsNegOverflow=boost::numeric::convdetail::non_applicable,
             IsPosOverflow=boost::numeric::convdetail::GT_HiT<conv_traits>,
 OverflowHandler=boost::numeric::numeric_cast_traits<int,bool>::overflow_policy
         ]
         c:\test\boost\boost\numeric\conversion\converter.hpp(35) : see
 reference to class template instantiation
 'boost::numeric::convdetail::non_rounding_converter<Traits,RangeChecker,RawConverter>'
 being compiled
         with
         [
             Traits=conv_traits,
 RangeChecker=boost::numeric::convdetail::generic_range_checker<conv_traits,boost::numeric::convdetail::non_applicable,boost::numeric::convdetail::GT_HiT<conv_traits>,boost::numeric::numeric_cast_traits<int,bool>::overflow_policy>,
             RawConverter=boost::numeric::raw_converter<conv_traits>
         ]
         c:\test\boost\boost\numeric\conversion\cast.hpp(53) : see
 reference to class template instantiation
 'boost::numeric::converter<T,S,Traits,OverflowHandler,Float2IntRounder,RawConverter,UserRangeChecker>'
 being compiled
         with
         [
             T=int,
             S=bool,
             Traits=conv_traits,
 OverflowHandler=boost::numeric::numeric_cast_traits<int,bool>::overflow_policy,
             Float2IntRounder=boost::numeric::Trunc<bool>,
             RawConverter=boost::numeric::raw_converter<conv_traits>,
 UserRangeChecker=boost::numeric::numeric_cast_traits<int,bool>::range_checking_policy
         ]

 The code that may lead to warning is like this:
 {{{
     int val = boost::numeric_cast<int>(true);
 }}}

-- 
Ticket URL: <https://svn.boost.org/trac/boost/ticket/6297>
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