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NewKernel_d/include/CGAL/Kernel_d/Cartesian_converter.h

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+#ifndef CGAL_KERNEL_D_CARTESIAN_CONVERTER_H
+#define CGAL_KERNEL_D_CARTESIAN_CONVERTER_H
+
+#include <CGAL/basic.h>
+#include <CGAL/Object.h>
+#include <CGAL/NT_converter.h>
+#include <CGAL/functor_tags.h>
+#include <CGAL/Kernel/mpl.h>
+#include <CGAL/is_iterator.h>
+#include <CGAL/transforming_iterator.h>
+#include <boost/utility/enable_if.hpp>
+
+namespace CGAL {
+template<class K1, class K2> class CartesianD_converter {
+	typedef typename K1::FT FT1;
+	typedef typename K2::FT FT2;
+	typedef NT_converter<FT1, FT2> NTc;
+	NTc c;
+	// TODO: store a K1 and a K2 and have a suitable constructor
+	public:
+	Origin operator()(Origin const&o)const{return o;}
+	Null_vector operator()(Null_vector const&v)const{return v;}
+	FT2 operator()(FT1 const&x)const{return c(x);}
+	//RT2 operator()(typename First_if_different<RT1,FT1>::Type const&x)const{return cr(x);}
+
+	template<class It>
+	transforming_iterator<NTc,typename boost::enable_if<is_iterator<It>,It>::type>
+	operator()(It const& it)const {
+		return make_transforming_iterator(it,c);
+	}
+
+	typename K2::Point operator()(typename K1::Point const& p){
+		typename K1::template Construct<Construct_cartesian_const_iterator_tag>::type i;
+		return K2::template Construct<Construct_point_tag>::type()(operator()(i.begin(p)),operator()(i.end(p)));
+	}
+
+	typename K2::Vector operator()(typename First_if_different<typename K1::Vector,typename K1::Point>::Type const& p){
+		typename K1::template Construct<Construct_cartesian_const_iterator_tag>::type i;
+		return K2::template Construct<Construct_vector_tag>::type()(operator()(i.begin(p)),operator()(i.end(p)));
+	}
+
+	typename K2::Object_2
+	operator()(const typename K1::Object_2 &obj) const
+	{
+#define CGAL_Kernel_obj(X) \
+		if (const typename K1::X * ptr = object_cast<typename K1::X>(&obj)) \
+		return make_object(operator()(*ptr));
+
+#include <CGAL/Kernel_d/interface_macros.h>
+		/*
+		if (const std::vector<typename K1::Point> * ptr = object_cast<std::vector<typename K1::Point> >(&obj)) {
+			std::vector<typename K2::Point> res (
+				operator()(ptr->begin()),
+				operator()(ptr->end()) );
+			return make_object(res);
+		}
+		*/
+
+		CGAL_error_msg("Cartesiand_converter is unable to determine what is wrapped in the Object");
+		return Object();
+	}
+
+
+};
+
+} //namespace CGAL
+
+#endif // CGAL_KERNEL_D_CARTESIAN_CONVERTER_H