CGAL 5.1.3 - 2D and 3D Linear Geometry Kernel
Kernel::Orientation_2 Concept Reference

## Definition

Refines:
AdaptableFunctor (with three arguments)
CGAL::orientation()
returns CGAL::LEFT_TURN, if r lies to the left of the oriented line l defined by p and q, returns CGAL::RIGHT_TURN if r lies to the right of l, and returns CGAL::COLLINEAR if r lies on l.
returns CGAL::LEFT_TURN if u and v form a left turn, returns CGAL::RIGHT_TURN if u and v form a right turn, and returns CGAL::COLLINEAR if u and v are collinear.