Oh dear.
../../boost/boost/type_traits/is_convertible.hpp:124: template instantiation depth exceeds maximum of 17 (use -ftemplate-depth-NN to increase the maximum) instantiating `boost::detail::is_convertible_impl<boost::signals::detail::any_bridge_compare<less<int>, int> &, boost::detail::int_convertible>::_m_from' *SEVENTEEN* ??? john -- "CUT IT OUT FACEHEAD" - jeffk