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

CGAL 4.8 - 2D and 3D Linear Geometry Kernel

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Modules | Macros
CGAL::intersection()
Global Kernel Functions

##

Depending on which CGAL kernel is used, different overloads of this global function are available.

Notes on Backward Compatibility

The CGAL::intersection() function used to return an `Object`, but starting with CGAL 4.2 the return type is determined by a metafunction defined by the kernel. To preserve backward compatibility `Object` can be constructed from the new return types implicitly, but switching to the new style is recommended. To enable the old style without any overhead, the macro `CGAL_INTERSECTION_VERSION` must be defined to `1` before any CGAL header is included.

See Also
  Upgrading from CGAL::Object to boost::variant
  CGAL::do_intersect()
  CGAL_INTERSECTION_VERSION

## Modules
| CGAL::intersection() (2D/3D Linear Kernel)
| CGAL::intersection() (2D Circular Kernel)
| CGAL::intersection() (3D Spherical Kernel)

## Macros
#define | CGAL_INTERSECTION_VERSION
| The macro `CGAL_INTERSECTION_VERSION` can be used to configure which version of the CGAL::intersection() function should be used and enables the corresponding APIs in other CGAL packages. More...

## Macro Definition Documentation

#define CGAL_INTERSECTION_VERSION

The macro `CGAL_INTERSECTION_VERSION` can be used to configure which version of the CGAL::intersection() function should be used and enables the corresponding APIs in other CGAL packages.

It should be defined before any CGAL header is included.

- `CGAL_INTERSECTION_VERSION == 1` CGAL::intersection() uses `Object`
- `CGAL_INTERSECTION_VERSION == 2` CGAL::intersection() uses `boost::optional< boost::variant< T... > >`

`#include <CGAL/intersections.h>`