6 Spanner::broken_at(PCol*c1, PCol *c2)const
8 Spanner *me_p = (Spanner*)this;
9 Spanner *span_p = do_break_at(c1,c2);
11 me_p->calc_children = true;
12 me_p->dependencies.add(span_p);
14 span_p->calc_children = false; // should handle in ctor
35 return Interval(0, r-l);
39 Spanner::print() const