[boost] [fusion] using fusion sequences with mpl

From: Stjepan Rajko (stipe_at_[hidden])
Date: 2007-11-29 19:39:26

Hello,

I am having problems getting fusion sequences to work with MPL.  The
docs indicate this should be possible , e.g. the "Adapted" page
states,

"Fusion sequences may also be adapted as fully conforming MPL
sequences (see Intrinsics)."  I couldn't find more information on the
Intrinsics page regarding the use of fusion sequences with MPL, but I
tried:

#include <boost/mpl/is_sequence.hpp>
#include <boost/fusion/container/vector.hpp>
#include <boost/fusion/sequence/intrinsic.hpp>

int main()
{
    BOOST_MPL_ASSERT(( boost::mpl::is_sequence<fusion::vector<int> > ));
}

And got a mess of errors from mpl::is_sequence<fusion::vector<int> >:
(gcc 4.0.1/darwin)

/Development/boost/boost/mpl/begin_end.hpp: In instantiation of
'boost::mpl::begin<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_> >':
[snip errors]
/Development/boost/boost/mpl/begin_end.hpp:35: error: invalid use of
undefined type 'struct
boost::mpl::begin_impl<boost::fusion::fusion_sequence_tag>'
[...more errors]

I tried things other than is_sequence (like mpl::at), but got similar
errors.  What am I missing?

Thanks for any suggestions!

Stjepan