CGAL 6.1 - 2D and 3D Linear Geometry Kernel

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CGAL::Simple_homogeneous< RingNumberType > Struct Template Reference
Reference Manual » Kernel Classes

`#include <CGAL/Simple_homogeneous.h>`

## Definition

template<typename RingNumberType>
struct CGAL::Simple_homogeneous< RingNumberType >

A model for a `Kernel` using homogeneous coordinates to represent the geometric objects.

In order for `Simple_homogeneous` to model Euclidean geometry in \( E^2\) and/or \( E^3\), for some mathematical ring \( E\) (e.g., the integers \(\mathbb{Z}\) or the rationals \(\mathbb{Q}\)), the template parameter `RingNumberType` must model the mathematical ring \( E\). That is, the ring operations on this number type must compute the mathematically correct results. If the number type provided as a model for `RingNumberType` is only an approximation of a ring (such as the built-in type `double`), then the geometry provided by the kernel is only an approximation of Euclidean geometry.

Is model of
  `Kernel`

Implementation

In contrast to `Homogeneous`, no reference counting is used internally. This eases debugging, but may slow down algorithms that copy objects intensively, or slightly speed up others.

See also
  `CGAL::Cartesian<FieldNumberType>`
  `CGAL::Homogeneous<RingNumberType>`
  `CGAL::Simple_cartesian<FieldNumberType>`

## Types
typedef Quotient< RingNumberType > | FT
typedef RingNumberType | RT