CGAL 6.1.1 - Quadtrees, Octrees, and Orthtrees

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CollectionPartitioningOrthtreeTraits Concept Reference
Reference Manual » Concepts

## Definition

Refinement of the `OrthtreeTraitsWithData` concept, adding requirements for the traits class of a `CGAL::Orthtree` in order to supports nearest-neighbor searching.

Nearest neighbor searches expect a tree where `Node_data` is a model of `ForwardRange`. The leaf nodes of the tree represent an exclusive partition of the elements contained in the tree. This means that no element should be contained by more than one node.

Refines
  `OrthtreeTraitsWithData`

Has models
  `CGAL::Orthtree_traits_point<GeomTraits, PointRange, PointMap, DimensionTag>`

## Types
using | Sphere_d = unspecified_type
| Sphere Type used for the shrinking-sphere approach for neighbor queries; needs to be copy assignable.
using | Node_data = unspecified_type
| The data type contained by each node; must be a model of `ForwardRange` in addition to default constructible, copy constructible and copy assignable.
using | Node_data_element = unspecified_type
| An element of the `Node_data` list-like type.
using | Squared_distance_of_element = unspecified_type
| Functor with an operator that calculates the squared distance of a `Node_data_element` from a point.
using | Construct_sphere_d = unspecified_type
| Functor with an operator that constructs a `Sphere_d` from a provided center and squared radius.
using | Construct_center_d = unspecified_type
| Functor with an operator that provides the center of a `Sphere_d`.
using | Compute_squared_radius_d = unspecified_type
| Functor with an operator that provides the squared radius of a `Sphere_d`.

## Operations
Construct_sphere_d | construct_sphere_d_object () const
| constructs an object of type `ConstructSphere_d`.
Construct_center_d | construct_center_d_object () const
| constructs an object of type `ConstructCenter_d`.
Compute_squared_radius_d | compute_squared_radius_d_object () const
| constructs an object of type `ComputeSquaredRadius_d`.
Squared_distance_of_element | squared_distance_of_element_object () const
| constructs an object of type `Squared_distance_of_element`.

## Member Typedef Documentation

## ◆ Compute_squared_radius_d

using CollectionPartitioningOrthtreeTraits::Compute_squared_radius_d = unspecified_type

Functor with an operator that provides the squared radius of a `Sphere_d`.

Provides the operator: `FT operator()(const Sphere_d&)`

## ◆ Construct_center_d

using CollectionPartitioningOrthtreeTraits::Construct_center_d = unspecified_type

Functor with an operator that provides the center of a `Sphere_d`.

Provides the operator: `Point_d operator()(const Sphere_d&)`

## ◆ Construct_sphere_d

using CollectionPartitioningOrthtreeTraits::Construct_sphere_d = unspecified_type

Functor with an operator that constructs a `Sphere_d` from a provided center and squared radius.

Provides the operator: `Sphere_d operator()(const Point_d&, const FT&)`

## ◆ Node_data_element

using CollectionPartitioningOrthtreeTraits::Node_data_element = unspecified_type

An element of the `Node_data` list-like type.

Must be constructible from the value type of a `Node_data::iterator`. Typically the same as that type, but can also be an `std::reference_wrapper<>` if the type is not copyable.

## ◆ Squared_distance_of_element

using CollectionPartitioningOrthtreeTraits::Squared_distance_of_element = unspecified_type

Functor with an operator that calculates the squared distance of a `Node_data_element` from a point.

Provides the operator: `FT operator()(const Node_data_element&, const Point_d&)`