[Boost-bugs] [Boost C++ Libraries] #11572: The generic fusion sequence convert to a deque fails with a compiler error

Subject: [Boost-bugs] [Boost C++ Libraries] #11572: The generic fusion sequence convert to a deque fails with a compiler error
From: Boost C++ Libraries (noreply_at_[hidden])
Date: 2015-08-24 00:00:04

#11572: The generic fusion sequence convert to a deque fails with a compiler error
----------------------------------+---------------------
 Reporter:  eldiener              |      Owner:  djowel
     Type:  Bugs                  |     Status:  new
Milestone:  To Be Determined      |  Component:  fusion
  Version:  Boost Release Branch  |   Severity:  Problem
 Keywords:                        |
----------------------------------+---------------------
 The following code, as deque_convert.cpp, which uses the generic
 boost::fusion::convert to convert to a boost::fusion::deque, fails with a
 compiler error:

     #include <boost/detail/lightweight_test.hpp>
     #include <boost/fusion/include/deque.hpp>
     #include <boost/fusion/include/make_deque.hpp>
     #include <boost/fusion/include/make_vector.hpp>
     #include <boost/fusion/sequence/intrinsic/at_c.hpp>
     #include <boost/fusion/sequence/convert.hpp>
     #include <string>

     int main()
     {
     boost::fusion::deque<int, std::string> t =
 boost::fusion::convert<boost::fusion::deque_tag>(boost::fusion::make_vector(123,
 "Hola!!!")); // Line 13
     //    boost::fusion::deque<int, std::string> t =
 boost::fusion::convert<boost::fusion::deque_tag>(boost::fusion::make_deque(123,
 "Hola!!!")); // Line 14
     BOOST_TEST(boost::fusion::at_c<0>(t) == 123);
     BOOST_TEST(boost::fusion::at_c<1>(t) == "Hola!!!");
     return boost::report_errors();
     }

 Compiling with mingw-64/gcc-5.1 on Windows:

     "C:/Utilities/mingw-w64/i686-5.1.0-posix-dwarf-
 rt_v4-rev0/mingw32/bin/g++"  -ftemplate-depth-128 -Wno-unused-local-
 typedefs -ftrack-macro-expansion=0 -O0 -fno-inline -Wall -g -march=i686
 -m32  -DBOOST_ALL_NO_LIB=1  -I"..\..\.." -c -o
 "..\..\..\bin.v2\libs\fusion\test\deque_convert.test\gcc-
 mingw-5.1\debug\sequence\deque_convert.o" "sequence\deque_convert.cpp"

 In file included from
 ..\..\../boost/fusion/container/deque/convert.hpp:12:0,
                  from ..\..\../boost/fusion/container/deque.hpp:14,
                  from ..\..\../boost/fusion/include/deque.hpp:11,
                  from sequence\deque_convert.cpp:2:
 ..\..\../boost/fusion/container/deque/detail/convert_impl.hpp: In
 instantiation of 'static
 boost::fusion::extension::convert_impl<boost::fusion::deque_tag>::apply<Sequence>::type
 boost::fusion::extension::convert_impl<boost::fusion::deque_tag>::apply<Sequence>::call(Sequence&)
 [with Sequence = const boost::fusion::vector2<int, const char (&)[8]>;
 boost::fusion::extension::convert_impl<boost::fusion::deque_tag>::apply<Sequence>::type
 = boost::fusion::deque<int, const char (&)[8], boost::fusion::void_,
 boost::fusion::void_, boost::fusion::void_, boost::fusion::void_,
 boost::fusion::void_, boost::fusion::void_, boost::fusion::void_,
 boost::fusion::void_>]':
 ..\..\../boost/fusion/sequence/convert.hpp:48:25:   required from
 'typename boost::fusion::result_of::convert<Tag, const Sequence>::type
 boost::fusion::convert(const Sequence&) [with Tag =
 boost::fusion::deque_tag; Sequence = boost::fusion::vector2<int, const
 char (&)[8]>; typename boost::fusion::result_of::convert<Tag, const
 Sequence>::type = boost::fusion::deque<int, const char (&)[8],
 boost::fusion::void_, boost::fusion::void_, boost::fusion::void_,
 boost::fusion::void_, boost::fusion::void_, boost::fusion::void_,
 boost::fusion::void_, boost::fusion::void_>]'
 sequence\deque_convert.cpp:11:139:   required from here
 ..\..\../boost/fusion/container/deque/detail/convert_impl.hpp:44:37:
 error: 'call' is not a member of
 'boost::fusion::extension::convert_impl<boost::fusion::deque_tag>::apply<const
 boost::fusion::vector2<int, const char (&)[8]> >::gen {aka
 boost::fusion::result_of::as_deque<const boost::fusion::vector2<int, const
 char (&)[8]> >}'
                      return gen::call(seq);

 Compiling with msvc-14.0 on Windows:

 file ..\..\..\bin.v2\libs\fusion\test\deque_convert.test\msvc-14.0\debug
 \threading-multi\sequence\deque_convert.obj.rsp
 "sequence\deque_convert.cpp"
 -Fo"..\..\..\bin.v2\libs\fusion\test\deque_convert.test\msvc-14.0\debug
 \threading-multi\sequence\deque_convert.obj"    -TP /Z7 /Od /Ob0 /W3 /GR
 /MDd /Zc:forScope /Zc:wchar_t /wd4675 /EHs -c
 -DBOOST_ALL_NO_LIB=1
 "-I..\..\.."
 compile-c-c++
 ..\..\..\bin.v2\libs\fusion\test\deque_convert.test\msvc-14.0\debug
 \threading-multi\sequence\deque_convert.obj

     call
 "C:\Users\eldiener\AppData\Local\Temp\b2_msvc_14.0_vcvarsall_x86.cmd" >nul
 cl /Zm800 -nologo
 @"..\..\..\bin.v2\libs\fusion\test\deque_convert.test\msvc-14.0\debug
 \threading-multi\sequence\deque_convert.obj.rsp"

 deque_convert.cpp
 Unknown compiler version - please run the configure tests and report the
 results
 C:\Programming\VersionControl\modular-
 boost\boost/fusion/container/deque/detail/convert_impl.hpp(44): error
 C2039: 'call': is not a member of
 'boost::fusion::result_of::as_deque<Sequence>'
         with
         [
             Sequence=const boost::fusion::vector2<int,const char (&)[8]>
         ]
 C:\Programming\VersionControl\modular-
 boost\boost/fusion/container/deque/detail/convert_impl.hpp(43): note:
 while compiling class template member function
 'boost::fusion::deque<int,const char
 (&)[8],boost::fusion::void_,boost::fusion::void_,boost::fusion::void_,boost::fusion::void_,boost::fusion::void_,boost::fusion::void_,boost::fusion::void_,boost::fusion::void_>
 boost::fusion::extension::convert_impl<boost::fusion::deque_tag>::apply<Sequence>::call(Sequence
 &)'
         with
         [
             Sequence=const boost::fusion::vector2<int,const char (&)[8]>
         ]
 C:\Programming\VersionControl\modular-
 boost\boost/fusion/sequence/convert.hpp(48): note: see reference to
 function template instantiation 'boost::fusion::deque<int,const char
 (&)[8],boost::fusion::void_,boost::fusion::void_,boost::fusion::void_,boost::fusion::void_,boost::fusion::void_,boost::fusion::void_,boost::fusion::void_,boost::fusion::void_>
 boost::fusion::extension::convert_impl<boost::fusion::deque_tag>::apply<Sequence>::call(Sequence
 &)' being compiled
         with
         [
             Sequence=const boost::fusion::vector2<int,const char (&)[8]>
         ]
 C:\Programming\VersionControl\modular-
 boost\boost/fusion/sequence/convert.hpp(29): note: see reference to class
 template instantiation
 'boost::fusion::extension::convert_impl<boost::fusion::deque_tag>::apply<Sequence>'
 being compiled
         with
         [
             Sequence=const boost::fusion::vector2<int,const char (&)[8]>
         ]
 sequence\deque_convert.cpp(11): note: see reference to class template
 instantiation
 'boost::fusion::result_of::convert<boost::fusion::deque_tag,const
 boost::fusion::vector2<T,const char (&)[8]>>' being compiled
         with
         [
             T=int
         ]

 Compiling with clang-3.8:

   "C:/Programming/VersionControl/bninja_installed_clang/bin/clang++" -c -x
 c++ -D__MINGW_FORCE_SYS_INTRINS -Wno-unused-local-typedef -Wno-dll-
 attribute-on-redeclaration -O0 -g -fno-inline -Wall -g -march=i686 -m32
 -DBOOST_ALL_NO_LIB=1 -I"..\..\.." -o
 "..\..\..\bin.v2\libs\fusion\test\deque_convert.test\clang-
 linux-3.8\debug\sequence\deque_convert.obj" "sequence\deque_convert.cpp"

 In file included from sequence\deque_convert.cpp:2:
 In file included from ..\..\..\boost/fusion/include/deque.hpp:11:
 In file included from ..\..\..\boost/fusion/container/deque.hpp:14:
 In file included from
 ..\..\..\boost/fusion/container/deque/convert.hpp:12:
 ..\..\..\boost/fusion/container/deque/detail/convert_impl.hpp:44:33:
 error: no member named 'call' in 'boost::fusion::result_of::as_deque<const
 boost::fusion::vector2<int, char const (&)[8]> >'
                     return gen::call(seq);
                            ~~~~~^
 ..\..\..\boost/fusion/sequence/convert.hpp:48:21: note: in instantiation
 of member function
 'boost::fusion::extension::convert_impl<boost::fusion::deque_tag>::apply<const
 boost::fusion::vector2<int, char const (&)[8]> >::call' requested here
         return gen::call(seq);
                     ^
 sequence\deque_convert.cpp:11:63: note: in instantiation of function
 template specialization 'boost::fusion::convert<boost::fusion::deque_tag,
 boost::fusion::vector2<int, char const (&)[8]> >' requested here
     boost::fusion::deque<int, std::string> t =
 boost::fusion::convert<boost::fusion::deque_tag>(boost::fusion::make_vector(123,
 "Hola!!!")); // Line 13

 Commenting out line 13 and uncommenting line 14 produces the same error. I
 do not believe any conversion to a boost::fusion::deque, using the generic
 boost::fusion::convert functionality, will work.

 I discovered this bug testing out a PR for the iterator library where a
 suggested change has been implemented so that the zip_iterator in the
 iterator library can use fusion sequences, and through the fusion adapter,
 std::tuple, as the tuple type for the tupleiterator of a zip_iterator.

-- 
Ticket URL: <https://svn.boost.org/trac/boost/ticket/11572>
Boost C++ Libraries <http://www.boost.org/>
Boost provides free peer-reviewed portable C++ source libraries.