CGAL 6.1 - 2D and 3D Linear Geometry Kernel

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Kernel::Orientation_2 Concept Reference
Reference Manual » Concepts » Kernel Function Object Concepts

## Definition

Refines
  `AdaptableTernaryFunction`

See also
  `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.