I have the following code: #include <utility> #include <boost/mpl/map.hpp> #include <boost/mpl/transform.hpp> template <typename MplPair> struct make_ptr_pair1 { typedef std::pair<typename MplPair::first *, typename MplPair::second *> type; }; template <typename First, typename Second> struct make_ptr_pair2 { typedef std::pair<First *, Second *> type; }; int main(int argc, char *argv[]) { namespace mpl = boost::mpl; typedef mpl::map< mpl::pair<int, double> > my_map; //typedef mpl::transform< my_map, make_ptr_pair1<mpl::_1> >::type ptr_pair_seq1; //typedef mpl::transform< my_map, make_ptr_pair2<mpl::_1, mpl::_2>
::type ptr_pair_seq2; return 0; }
If I uncomment any of the two mpl::transform lines in main(), the code doesn't compile (VC8). The point is to get a sequence of std::pairs out of the content of the mpl::map. Is there anything I'm doing wrong? Can mpl::transform be used for mpl::map? Maybe I can do it with fusion, but the above code seems to be something that's supposed to be working, isn't it? Yuval