[Boost-bugs] [Boost C++ Libraries] #8740: Possibly invalid assertion in define_with_defaults()

Subject: [Boost-bugs] [Boost C++ Libraries] #8740: Possibly invalid assertion in define_with_defaults()
From: Boost C++ Libraries (noreply_at_[hidden])
Date: 2013-06-27 16:06:13

#8740: Possibly invalid assertion in define_with_defaults()
------------------------------------------+---------------------
 Reporter:  Andreas Kloeckner <inform@…>  |      Owner:  rwgk
     Type:  Bugs                          |     Status:  new
Milestone:  To Be Determined              |  Component:  Python
  Version:  Boost 1.53.0                  |   Severity:  Problem
 Keywords:                                |
------------------------------------------+---------------------
 Hi there,

 this assertion in `boost/python/detail/defaults_def.hpp` seems backwards:

 {{{
 BOOST_STATIC_ASSERT(
     (stubs_type::max_args) <= mpl::size<SigT>::value);
 }}}

 I.e. I would expect the assertion to be that the actual number of
 arguments is *smaller* than the max or *larger* than the min.

 It caused me a compile error like the following on gcc 4.8:

 {{{
 In file included from /usr/include/boost/python/overloads.hpp:11:0,
                  from /usr/include/boost/python.hpp:52,
                  from src/wrapper/common.hpp:24,
                  from src/wrapper/id3.cpp:40:
 /usr/include/boost/python/detail/defaults_def.hpp: In instantiation of
 ‘void boost::python::detail::define_with_defaults(const char*, const
 OverloadsT&, NameSpaceT&, const SigT&) [with OverloadsT =
 {anonymous}::render_overloads; NameSpaceT =
 boost::python::class_<TagLib::ID3v2::Tag,
 boost::noncopyable_::noncopyable, boost::python::bases<TagLib::Tag> >;
 SigT = boost::mpl::vector2<TagLib::ByteVector, TagLib::ID3v2::Tag&>]’:
 /usr/include/boost/python/class.hpp:598:9:   required from ‘void
 boost::python::class_<T, X1, X2, X3>::def_maybe_overloads(const char*,
 SigT, const OverloadsT&, const boost::python::detail::overloads_base*)
 [with OverloadsT = {anonymous}::render_overloads; SigT =
 TagLib::ByteVector (TagLib::ID3v2::Tag::*)()const; W = TagLib::ID3v2::Tag;
 X1 = boost::noncopyable_::noncopyable; X2 =
 boost::python::bases<TagLib::Tag>; X3 =
 boost::python::detail::not_specified]’
 /usr/include/boost/python/class.hpp:245:9:   required from
 ‘boost::python::class_<T, X1, X2, X3>::self& boost::python::class_<T, X1,
 X2, X3>::def(const char*, A1, const A2&) [with A1 = TagLib::ByteVector
 (TagLib::ID3v2::Tag::*)()const; A2 = {anonymous}::render_overloads; W =
 TagLib::ID3v2::Tag; X1 = boost::noncopyable_::noncopyable; X2 =
 boost::python::bases<TagLib::Tag>; X3 =
 boost::python::detail::not_specified; boost::python::class_<T, X1, X2,
 X3>::self = boost::python::class_<TagLib::ID3v2::Tag,
 boost::noncopyable_::noncopyable, boost::python::bases<TagLib::Tag> >]’
 src/wrapper/id3.cpp:221:8:   required from here
 /usr/include/boost/python/detail/defaults_def.hpp:247:1: error: invalid
 application of ‘sizeof’ to incomplete type
 ‘boost::STATIC_ASSERTION_FAILURE<false>’
 }}}

-- 
Ticket URL: <https://svn.boost.org/trac/boost/ticket/8740>
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