text: /*!
  \ingroup PkgArrangement2PointLocation
  
  The macro `CGAL_ARR_POINT_LOCATION_VERSION` can be used to configure
  the point-location query API. In particular, it determines which version
  of the result type of the point-location and vertical ray-shooting queries
  should be used by models of the concepts `ArrangementPointLocation_2`
  and `ArrangementVerticalRayShoot_2`, and by the free function
  `locate`. The `CGAL_ARR_POINT_LOCATION_VERSION` should be defined before any \cgal header
  is included.
  
  - `CGAL_ARR_POINT_LOCATION_VERSION` == 1, the result type is set to be `CGAL::Object`.
  - `CGAL_ARR_POINT_LOCATION_VERSION` == 2, the result type is set to be
  `boost::variant<Vertex_const_handle,Halfedge_const_handle,Face_const_handle>`, where `Vertex_const_handle`, `Halfedge_const_handle`, and
  `Face_const_handle` are the corresponding nested types in a `CGAL::Arrangement_2` instance.
  
  
  \sa `ArrangementPointLocation_2`
  \sa `ArrangementVerticalRayShoot_2`
  \sa `CGAL::Arr_point_location_result<Arrangement>`
  */
  #define CGAL_ARR_POINT_LOCATION_VERSION
  
  namespace CGAL {
  
  /*!
  \ingroup PkgArrangement2PointLocation
  
  A unary metafunction to determine the return type of a point-location
  or vertical ray-shoot query.
  
  \tparam Arrangement must be an instance of the `CGAL::Arrangement_2<Traits,Dcel>` class template.
  
  \sa `ArrangementPointLocation_2`
  \sa `ArrangementVerticalRayShoot_2`
  \sa `CGAL::Arr_naive_point_location<Arrangement>`
  \sa `CGAL::Arr_walk_along_line_point_location<Arrangement>`
  \sa `CGAL::Arr_landmarks_point_location<Arrangement,Generator>`
  \sa `CGAL::Arr_trapezoid_ric_point_location<Arrangement>`
  \sa `CGAL_ARR_POINT_LOCATION_VERSION`
  */
  template <class Arrangement>
  class Arr_point_location_result
  {
  public:
    /*! The type of the arrangement feature that is the result of a
     * point-location query or a vertical ray-shoot query, namely,
     * `boost::variant<Arrangement::Vertex_const_handle, Arrangement::Halfedge_const_handle, Arrangement::Face_const_handle>`
     * if `::CGAL_ARR_POINT_LOCATION_VERSION` == 2, which is the default, otherwise
     * `CGAL::Object`.
     */
    typedef unspecified_type Type;
  }; /* end Arr_point_location_result */
  } /* end namespace CGAL */
  