Joel de Guzman — Wed, 17 Oct 2012 05:48:32 GMT

I don't see any problem with the original code. Which compiler? Do you have a test case that exhibits this problem?

Wed, 17 Oct 2012 06:40:43 GMT

I tried with gcc 4.8,4.7,4.6 and clang 3.2.

Simple testcase is here.

#include <boost/fusion/container/vector.hpp>
#include <boost/fusion/container/list.hpp>
#include <boost/fusion/sequence/convert.hpp>
int main()
{
    boost::fusion::vector<int> v(0);
    boost::fusion::convert<boost::fusion::cons_tag>(v);
}

compiler outputs:

$ g++-4.8.0 -fmax-errors=1 hoge.cpp
In file included from hoge.cpp:3:0:
/usr/local/include/boost/fusion/sequence/convert.hpp: In instantiation of 'typename boost::fusion::result_of::convert<Tag, Sequence>::type boost::fusion::convert(Sequence&) [with Tag = boost::fusion::cons_tag; Sequence = boost::fusion::vector<int>; typename boost::fusion::result_of::convert<Tag, Sequence>::type = boost::fusion::cons<int, boost::fusion::nil>]':
hoge.cpp:8:54:   required from here
/usr/local/include/boost/fusion/sequence/convert.hpp:36:29: error: 'call' is not a member of 'gen {aka boost::fusion::extension::convert_impl<boost::fusion::cons_tag>}'
         return gen::call(seq);
                             ^
compilation terminated due to -fmax-errors=1.
$ g++-4.7.3 -fmax-errors=1 hoge.cpp
In file included from hoge.cpp:3:0:
/usr/local/include/boost/fusion/sequence/convert.hpp: In instantiation of 'typename boost::fusion::result_of::convert<Tag, Sequence>::type boost::fusion::convert(Sequence&) [with Tag = boost::fusion::cons_tag; Sequence = boost::fusion::vector<int>; typename boost::fusion::result_of::convert<Tag, Sequence>::type = boost::fusion::cons<int, boost::fusion::nil>]':
hoge.cpp:8:54:   required from here
/usr/local/include/boost/fusion/sequence/convert.hpp:36:29: error: 'call' is not a member of 'gen {aka boost::fusion::extension::convert_impl<boost::fusion::cons_tag>}'
compilation terminated due to -fmax-errors=1.
$ g++-4.6 -fmax-errors=1 hoge.cpp
In file included from hoge.cpp:3:0:
/usr/local/include/boost/fusion/sequence/convert.hpp: In function ‘typename boost::fusion::result_of::convert<Tag, Sequence>::type boost::fusion::convert(Sequence&) [with Tag = boost::fusion::cons_tag, Sequence = boost::fusion::vector<int>, typename boost::fusion::result_of::convert<Tag, Sequence>::type = boost::fusion::cons<int, boost::fusion::nil>]’:
hoge.cpp:8:54:   instantiated from here
/usr/local/include/boost/fusion/sequence/convert.hpp:36:29: error: ‘call’ is not a member of ‘gen {aka boost::fusion::extension::convert_impl<boost::fusion::cons_tag>}’
compilation terminated due to -fmax-errors=1.
$ clang++ hoge.cpp
In file included from hoge.cpp:3:
/usr/local/include/boost/fusion/sequence/convert.hpp:36:21: error: no member named 'call' in 'boost::fusion::extension::convert_impl<boost::fusion::cons_tag>'
        return gen::call(seq);
               ~~~~~^
hoge.cpp:8:5: note: in instantiation of function template specialization 'boost::fusion::convert<boost::fusion::cons_tag, boost::fusion::vector<int, 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::void_> >' requested here
    boost::fusion::convert<boost::fusion::cons_tag>(v);
    ^
1 error generated.

cc set

Tue, 01 Oct 2013 22:59:50 GMT

cc phantall+boost@… added

I can reproduce this with Solaris Studio 12.3 (with all 3 STL implementations), gcc 4.4.6, and clang version 3.2.

Tue, 01 Oct 2013 23:04:26 GMT

... and I can confirm that the suggested fix resolves the problem for all 3 compilers.

status changed; resolution set

Joel de Guzman — Tue, 01 Oct 2013 23:42:52 GMT

status new → closed
resolution → fixed

patch applied. thanks!

Boost C++ Libraries: Ticket #7513: fusion::convert() tries to call convert_impl::call but there isn't

cc set

status changed; resolution set