Re: [Boost-bugs] [Boost C++ Libraries] #7270: C++11 narrowing problem in gil

Subject: Re: [Boost-bugs] [Boost C++ Libraries] #7270: C++11 narrowing problem in gil
From: Boost C++ Libraries (noreply_at_[hidden])
Date: 2016-12-09 01:59:01

#7270: C++11 narrowing problem in gil
-------------------------------+----------------------
  Reporter:  jbosch            |      Owner:  hljin
      Type:  Bugs              |     Status:  reopened
 Milestone:  To Be Determined  |  Component:  GIL
   Version:  Boost 1.63.0      |   Severity:  Problem
Resolution:                    |   Keywords:  c++11
-------------------------------+----------------------
Changes (by babatakao@…):

 * status:  closed => reopened
 * version:  Boost 1.51.0 => Boost 1.63.0
 * resolution:  fixed =>

Comment:

 boost 1.61 still causes the error with clang: Apple LLVM version 7.3.0
 (clang-703.0.31)

 {{{
 /buildroot/libs/boost/include/boost/gil/channel_algorithm.hpp:55:85:
 error: non-type template argument evaluates to -1, which cannot be
 narrowed to type 'unsigned long' [-Wc++11-narrowing]
 struct unsigned_integral_max_value : public
 mpl::integral_c<UnsignedIntegralChannel,-1> {};
 ^
 /buildroot/libs/boost/include/boost/gil/channel_algorithm.hpp:55:85:
 /libs/boost/include/boost/gil/channel_algorithm.hpp:205:19: note: in
 instantiation of template class
 'boost::gil::detail::unsigned_integral_max_value<unsigned long>' requested
 here
         if (src > unsigned_integral_max_value<uintmax_t>::value - div2)
                   ^
 1 error generated.
 }}}

 and it does not seem to be fixed on boost 1.63.0 beta1.

 (The error occurs only if "-std=c++11" is given.)

 "boost-gil-clang-c++11-narrowing.patch" fixes the error.

-- 
Ticket URL: <https://svn.boost.org/trac/boost/ticket/7270#comment:3>
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