CGAL 6.1.2 - 2D and 3D Linear Geometry Kernel: CGAL::Dimension_tag< dim > Struct Template Reference

CGAL 6.1.2 - 2D and 3D Linear Geometry Kernel

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CGAL::Dimension_tag< dim > Struct Template Reference
Reference Manual » Dimension Handling Tools

`#include <CGAL/Dimension.h>`

## Definition

template<typename int dim>
struct CGAL::Dimension_tag< dim >

An object of the class `Dimension_tag` is an empty object which can be used for dispatching functions based on the dimension of an object, as provided by the `dim` parameter.

It is useful in cases where it is not more practical to pass the dimension as a template parameter directly.

Example

The following code declares two functions constructing two points at the origin, either in 2D or in 3D.

Point_2<K> get_origin(Dimension_tag<2>) { return Point_2<K>(ORIGIN); }
Point_3<K> get_origin(Dimension_tag<3>) { return Point_3<K>(ORIGIN); }
std::cout << get_origin(Dimension_tag<2>())) << std::endl;
CGAL::Point_2
An object p of the class Point_2 is a point in the two-dimensional Euclidean plane .
Definition: Point_2.h:37
CGAL::Point_3
An object of the class Point_3 is a point in the three-dimensional Euclidean space .
Definition: Point_3.h:23
CGAL::ORIGIN
const CGAL::Origin ORIGIN
A symbolic constant which denotes the point at the origin.
Definition: enum.h:169
CGAL::Dimension_tag
An object of the class Dimension_tag is an empty object which can be used for dispatching functions b...
Definition: Dimension.h:86

See also
  `CGAL::Ambient_dimension<T, K>`
  `CGAL::Feature_dimension<T, K>`
  `CGAL::Dynamic_dimension_tag`

## Constants
static const int | value
| The value of the `dim` parameter.