[Boost-users] [Fusion, maybe?] Workings of ADL.

I expected this to work #include <boost/fusion/include/vector.hpp> #include <boost/fusion/include/at_c.hpp> typedef boost::fusion::vector<int, int> V; int first( const V & v ) { return at_c<0>( v ); } but I find I need a "using namespace boost::fusion;". Why isn't this covered by ADL? Thx - Rob.