## CGAL::Arr_non_caching_segment_traits_2<Kernel>

### Definition

The traits class *Arr_non_caching_segment_traits_2<Kernel>* is a model of the *ArrangementTraits_2*
concept that allows the construction and maintenance of arrangements of
line segments. It is parameterized with a Cgal-Kernel type, and it
is derived from it. This traits class is a thin layer above the
parameterized kernel. It inherits the *Point_2* from the kernel and its
*X_monotone_curve_2* and *Curve_2* types are both defined as
*Kernel::Segment_2*. Most traits-class functor are inherited from the
kernel functor, and the traits class only supplies the necessary functors
that are not provided by the kernel. The kernel is parameterized with a
number type, which should support exact rational arithmetic in order to
avoid robustness problems, although other number types could be used at the
user's own risk.

The traits-class implementation is very simple, yet may lead to
a cascaded representation of intersection points with exponentially long
bit-lengths, especially if the kernel is parameterized with a number type
that does not perform normalization (e.g. *Quotient<MP_Float>*).
The *Arr_segment_traits_2* traits class avoids this cascading
problem, and should be the default choice for implementing arrangements of
line sgements. It is recommended to use *Arr_non_caching_segment_traits_2<Kernel>* only for very sparse
arrangements of huge sets of input segments.

*#include <CGAL/Arr_non_caching_segment_traits_2.h>*

### Is Model for the Concepts

*ArrangementTraits_2*

*ArrangementLandmarkTraits_2*

### Inherits From

*Arr_non_caching_segment_basic_traits_2<Kernel>*

### See Also

*Arr_segment_traits_2<Kernel>*