CGAL::collinear_are_ordered_along_line

bool collinear_are_ordered_along_line ( Point_2<Kernel> p, Point_2<Kernel> q, Point_2<Kernel> r)
returns true, iff q lies between p and r.
Precondition: p, q and r are collinear.

bool collinear_are_ordered_along_line ( Point_3<Kernel> p, Point_3<Kernel> q, Point_3<Kernel> r)
returns true, iff q lies between p and r.
Precondition: p, q and r are collinear.

See Also

CGAL::are_ordered_along_line
CGAL::are_strictly_ordered_along_line
CGAL::collinear_are_strictly_ordered_along_line