Simonson, Lucanus J wrote:
I boils down to the fact that you are using std::pair<int, int> for your interval return type in get() in the screen_box_t traits, but did not register it as a type of interval concept or define traits for it. If you set up the interval_traits for std::pair and register it with a specialization of geometry_concept for interval_concept you should be fine.
I've added this: template <> struct geometry_concept< std::pair<screen_coord_t,screen_coord_t> > { typedef interval_concept type; }; template <> struct interval_traits< std::pair<screen_coord_t,screen_coord_t> > { typedef screen_coord_t coordinate_type; static inline coordinate_type get(const std::pair<screen_coord_t,screen_coord_t>& interval, direction_1d dir) { return (dir==LOW) ? interval.first : interval.second; } }; and I seem to be getting much the same error. Any ideas? Phil.