[Boost-bugs] [Boost C++ Libraries] #3381: Compiler warning for is_signed

Subject: [Boost-bugs] [Boost C++ Libraries] #3381: Compiler warning for is_signed
From: Boost C++ Libraries (noreply_at_[hidden])
Date: 2009-09-01 07:42:14

#3381: Compiler warning for is_signed
------------------------------+---------------------------------------------
 Reporter:  rbock@…           |       Owner:  johnmaddock
     Type:  Bugs              |      Status:  new        
Milestone:  Boost 1.41.0      |   Component:  type_traits
  Version:  Boost 1.40.0      |    Severity:  Problem    
 Keywords:                    |  
------------------------------+---------------------------------------------
 Hi,

 with g++ 4.2.4, I get the following warning when using
 boost::is_signed<long long unsigned int> with -Wall -Wextra:

 type_traits/is_signed.hpp:33: warning: comparison of unsigned expression <
 0 is always false

 I fixed this for myself by replacing

 (static_cast<no_cv_t>(-1) < 0)

 by

 !(static_cast<no_cv_t>(-1) > 0)

 Regards,

 Roland

-- 
Ticket URL: <https://svn.boost.org/trac/boost/ticket/3381>
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