\( \newcommand{\E}{\mathrm{E}} \) \( \newcommand{\A}{\mathrm{A}} \) \( \newcommand{\R}{\mathrm{R}} \) \( \newcommand{\N}{\mathrm{N}} \) \( \newcommand{\Q}{\mathrm{Q}} \) \( \newcommand{\Z}{\mathrm{Z}} \) \( \def\ccSum #1#2#3{ \sum_{#1}^{#2}{#3} } \def\ccProd #1#2#3{ \sum_{#1}^{#2}{#3} }\)

CGAL 4.8 - dD Range and Segment Trees

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CGAL::Tree_anchor< Data, Window > Class Template Reference
dD Range and Segment Trees Reference

`#include <CGAL/Tree_base.h>`

## Inherits from

Tree_base.

## Definition

`Tree_anchor` is also derived from `Tree_base`.

Therefore, it provides the same methods as `Range_tree_d` and `Segment_tree_d`, but does nothing; it can be used as a recursion anchor for those classes. Therefore, instantiate `Sublayer_type` of `Range_tree_d` (`Segment_tree_d` respectively) with `Tree_anchor` and the container classes for the data items (`Data` and `Window`).

Example

The following figures show a number of rectangles and a 2-dimensional segment tree built on them.

Two dimensional interval data and the corresponding segment tree.

## Types
typedef unspecified_type | Data
| container `Data`.
typedef unspecified_type | Window
| container `Window`.

## Creation
Tree_anchor< Data, Window > | a ()

## Operations
template<class OutputIterator >
OutputIterator | window_query (Window win, OutputIterator result)
template<class OutputIterator >
OutputIterator | enclosing_query (Window win, OutputIterator result)
bool | is_valid ()
| returns true;
bool | is_inside (Window win, Data object)
| returns true.
bool | is_anchor ()
| returns true.