CGAL::are_ordered_along_line

bool	are_ordered_along_line ( Point_2<R> p, Point_2<R> q, Point_2<R> r)
		returns true, iff the three points are collinear and q lies between p and r. Note that true is returned, if q==p or q==r.
bool	are_ordered_along_line ( Point_3<R> p, Point_3<R> q, Point_3<R> r)
		returns true, iff the three points are collinear and q lies between p and r. Note that true is returned, if q==p or q==r.

See Also