#ifndef CGAL_KD_CARTESIAN_2_H
#define CGAL_KD_CARTESIAN_2_H
#include <CGAL/functor_tags.h>
#include <CGAL/predicates/sign_of_determinant.h>

namespace CGAL {
namespace CartesianDKernelFunctors {
template <class R_>
struct Orientation_of_points_2 : private Store_kernel<R_> {
	CGAL_FUNCTOR_INIT_STORE(Orientation_of_points_2);
	typedef typename R_::template Type<Point_tag>::type Point;
	typedef typename R_::Orientation result_type;
	typedef typename R_::FT FT;
	template<class Iter>
	result_type operator()(Iter f, Iter e)const{
		typename R_::template Functor<Compute_cartesian_coordinate_tag>::type c(this->kernel());
		Point const&A=*f;
		FT const& ax=c(A,0);
		FT const& ay=c(A,1);
		Point const&B=*++f;
		Point const&C=*++f;
		CGAL_assertion(++f==e);
		return sign_of_determinant(c(B,0)-ax,c(B,1)-ay,c(C,0)-ax,c(C,1)-ay);
	}
};
}
}

#endif