j == segs.size() - 1 && event_dir==RIGHT);
Drul_array<bool> inside (j > 0, j < segs.size()-1);
bool event = on_bound[event_dir]
j == segs.size() - 1 && event_dir==RIGHT);
Drul_array<bool> inside (j > 0, j < segs.size()-1);
bool event = on_bound[event_dir]