Hi Is it possible to make mpl::at_c lambda-able? For example, the following (dumb) code works as I would expect, but changing "at<_, int_<0> >" at // XXX to "at_c<_, 0>" does not. BOOST_MPL_AUX_LAMBDA_SUPPORT is not in the at_c struct, which is why it doesn't work I assume, but I don't know enough about mpl to know if it can be added (nor how, if so). ---------- #include <boost/mpl/count_if.hpp> #include <boost/mpl/vector.hpp> #include <boost/mpl/vector_c.hpp> #include <boost/mpl/equal_to.hpp> #include <boost/mpl/at.hpp> #include <boost/mpl/int.hpp> int main() { using namespace boost::mpl; typedef vector < vector_c<int, 9>, vector_c<int, 0>, vector_c<int, 6>, vector_c<int, 0> >::type v; BOOST_STATIC_ASSERT((count_if < v, equal_to < int_<0>, at<_, int_<0> > // XXX > >::type::value == 2)); } ---------- thanks, scott