CGAL 4.7 - Combinatorial Maps: CombinatorialMapItems Concept Reference

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CGAL 4.7 - Combinatorial Maps

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CombinatorialMapItems Concept Reference
Concepts

## Definition

The concept `CombinatorialMapItems` allows to customize a dD combinatorial map by choosing the type of darts, and by enabling and disabling some attributes. For that, it defines an inner class template named Dart_wrapper, with one template parameter, `CMap`, a model of the `CombinatorialMap` concept. This inner class must define two types: `Dart` and `Attributes`.

Has Models:
  CGAL::Combinatorial_map_min_items<d>

See Also
  `CombinatorialMap`
  `Dart`

Example

The following examples show two possible models of the `CombinatorialMapItems` concept: the first one for a 4D combinatorial map without enabled attributes, the second one for a 3D combinatorial map with edge attributes enabled, and associated with a Cell_attribute containing an `int`.

struct Exemple_Item_4
{
template < class CMap >
struct Dart_wrapper
{
typedef CGAL::Dart<4, CMap> Dart;
typedef CGAL::cpp11::tuple<> Attributes;
};
};
struct Exemple_Item_3
{
template < class CMap >
struct Dart_wrapper
{
typedef CGAL::Dart<3, CMap> Dart;
typedef CGAL::Cell_attribute<CMap, int> Edge_attrib;
typedef CGAL::cpp11::tuple<void,Edge_attrib> Attributes;
};
};

## Public Types

template<typename CMap >
using | Dart_wrapper = unspecified_type
| Wrapper class defining type of darts and types of attributes. More...

## Member Typedef Documentation

template<typename CMap >

using CombinatorialMapItems::Dart_wrapper = unspecified_type

Wrapper class defining type of darts and types of attributes.

The class `Dart_wrapper<CMap>` must provide:

- `Dart_wrapper<CMap>::Dart`, the type of dart, a model of the `Dart` concept.
- `Dart_wrapper<CMap>::Attributes` The tuple of attributes, containing at most CMap::dimension+1 types (one for each possible cell of the combinatorial map). Each type of the tuple must be either a model of the `CellAttribute` concept or `void`. The first type corresponds to 0-attributes, the second to 1-attributes and so on. If the \( i^{\mbox{th}}\) type in the tuple is `void`, (i-1)-attributes are disabled. Otherwise, (i-1)-attributes are enabled and have the given type. If the size of the tuple is k, with k<CMap::dimension+1, \( \forall\)i: k \( \leq\)i \( \leq\)CMap::dimension, i-attributes are disabled.

Note
  It can be implemented using a nested template class.