CGAL 5.6.3 - 2D Arrangements

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ArrangementBasicTopologyTraits Concept Reference
2D Arrangement Reference » Concepts » Topology Traits Concepts

## Definition

The concept `ArrangementBasicTopologyTraits` defines the minimal functionality needed for a model of a topology traits, which can substitutes the `TopolTraits` template parameters when the class template `Arrangement_on_surface_2<GeomTraits, TopolTraits>` is instantiated. In particular. a model of this concept holds the Dcel data structure used to represent the arrangement cells (i.e., vertices, edges, and facets) and the incident relations between them.

Has Models:
  `CGAL::Arr_spherical_topology_traits_2<GeometryTraits_2, Dcel>`

## Types
typedef unspecified_type | Point_2
| models the concept `ArrTraits::Point_2`.
typedef unspecified_type | X_monotone_curve_2
| models the concept `ArrTraits::XMonotoneCurve_2`.

## Access Functions
const Dcel & | dcel () const
| Obtain the DCEL (const version).
Dcel & | dcel ()
| Obtain the DCEL (non-const version).