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

CGAL 4.8 - 2D Arrangements

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CGAL::Arr_extended_dcel_text_formatter< Arrangement > Class Template Reference
I/O

`#include <CGAL/IO/Arr_text_formatter.h>`

## Definition

`Arr_extended_dcel_text_formatter` defines the format of an arrangement in an input or output stream (typically a file stream), thus enabling reading and writing an `Arrangement` instance using a simple text format.

The `Arrangement` class should be instantiated with a Dcel class which in turn instantiates the `Arr_extended_dcel` template with the `VertexData`, `HalfedgeData` and `FaceData` types. The formatter supports reading and writing the data objects attached to the arrangement vertices, halfedges and faces.

The `Arr_extended_dcel_text_formatter` class assumes that the nested `Point_2` and the `Curve_2` types defined by the `Arrangement` template-parameter, as well as the `VertexData`, `HalfedgeData` and `FaceData` types, can all be written to an input stream using the `<<` operator and read from an input stream using the `>>` operator.

Is Model Of:

  `ArrangementInputFormatter`

  `ArrangementOutputFormatter`

See Also
  `CGAL::read()`
  `CGAL::write()`
  `Arr_extended_dcel<Traits,VData,HData,FData,V,H,F>`

Examples:
  Arrangement_on_surface_2/dcel_extension_io.cpp.