CGAL 5.0.2 - 2D and 3D Linear Geometry Kernel
Kernel::Orientation_2 Concept Reference

## Definition

Refines:
AdaptableFunctor (with three arguments)
CGAL::orientation()

## Operations

A model of this concept must provide:

Orientation operator() (const Kernel::Point_2 &p, const Kernel::Point_2 &q, const Kernel::Point_2 &r)
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.

Orientation operator() (const Kernel::Vector_2 &u, const Kernel::Vector_2 &v)
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.