CGAL 6.1 - 2D Regularized Boolean Set-Operations

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Functions
Union Functions
Reference Manual

##

There are several overloaded function templates called `join()` that compute the union of two polygons.

A function template in this group has one of the following signatures:

1.1. | `bool join(const Type1& pgn1, const Type2& pgn2, Type3& res, UsePolylines = Tag_true());`
1.2. | `bool join(const Type1& pgn1, const Type2& pgn2, Type3& res);`
2. | `bool join(const Type1& pgn1, const Type2& pgn2, Type3& res, const GpsTraits& traits);`

There are also function templates that accept one or two ranges of input polygons:

3.1. | `OutputIterator join(InputIterator begin, InputIterator end, OutputIterator oi, UsePolylines = Tag_true());`
3.2. | `OutputIterator join(InputIterator begin, InputIterator end, OutputIterator oi);`
4. | `OutputIterator join(InputIterator begin, InputIterator end, OutputIterator oi, const GpsTraits& traits);`
5.1. | `OutputIterator join(InputIterator1 begin1, InputIterator1 end1, InputIterator2 begin2, InputIterator2 end2, OutputIterator oi, UsePolylines = Tag_true());`
5.2. | `OutputIterator join(InputIterator1 begin1, InputIterator1 end1, InputIterator2 begin2, InputIterator2 end2, OutputIterator oi);`
6. | `OutputIterator join(InputIterator1 begin1, InputIterator1 end1, InputIterator2 begin2, InputIterator2 end2, OutputIterator oi, const GpsTraits& traits);`

Template Parameters

  UsePolylines | determines whether the boundaries of the input polygons are treated as cyclic sequences of single ( \(x\)-monotone) segments or as cyclic sequences of ( \(x\)-monotone) polylines. If substituted with `CGAL::Tag_true`, which is the default, the input polygons are converted to general polygons bounded by polylines before the operation is actually performed. Then, the resulting general polygon with holes is converted back to a standard polygon. If substituted with `CGAL::Tag_false`, the input polygons are used as is. Refer to Traits Selection for more information.

- The types `Type1` and `Type2` of the parameters and of `InputIterator1::value_type` and `InputIterator2::value_type` must be convertible to the types specified in a row in the table below, respectively. The 3rd column specifies the corresponding dereference type of the output iterator.
- The types that apply to signatures (1.1.) and (5.1.) above are restricted to those listed in rows 1–4 in the table below.
- The types that apply to signatures (1.2.) and (5.2.) above are restricted to those listed in rows 5–8 in the table below.
- The type of `InputIterator::value_type` in (3.1.) above must be convertible to either `Polygon_2` or `Polygon_with_holes_2`.
- The type of `InputIterator::value_type` in (3.2.) above must be convertible to either `General_polygon_2` or `General_polygon_with_holes_2`.

| `Type1` | `Type2` | `Type3`
--- | --- | --- | ---
1 | `Polygon_2` | `Polygon_2` | `Polygon_with_holes_2`
2 | `Polygon_2` | `Polygon_with_holes_2` | `Polygon_with_holes_2`
3 | `Polygon_with_holes_2` | `Polygon_2` | `Polygon_with_holes_2`
4 | `Polygon_with_holes_2` | `Polygon_with_holes_2` | `Polygon_with_holes_2`
5 | `General_polygon_2` | `General_polygon_2` | `General_polygon_with_holes_2`
6 | `General_polygon_2` | `General_polygon_with_holes_2` | `General_polygon_with_holes_2`
7 | `General_polygon_with_holes_2` | `General_polygon_2` | `General_polygon_with_holes_2`
8 | `General_polygon_with_holes_2` | `General_polygon_with_holes_2` | `General_polygon_with_holes_2`

Parameters

  pgn1,pgn2 | the input polygons.
  (end,begin) | a range of input polygons.
  (end1,begin1) | the first range of input polygons.
  (end2,begin2) | the second range of input polygons.
  res | the resulting polygon.
  oi | the output iterator for the result.
  traits | an optional traits object.

See also
  `CGAL::complement()`
  `CGAL::do_intersect()`
  `CGAL::intersection()`
  `CGAL::difference()`
  `CGAL::symmetric_difference()`

## Functions
template<typename Kernel , typename Container >
bool | CGAL::join (const Polygon_2< Kernel, Container > &pgn1, const Polygon_2< Kernel, Container > &pgn2, General_polygon_with_holes_2< Polygon_2< Kernel, Container > > &res)
| computes the union of two polygons.
template<typename Kernel , typename Container , typename UsePolylines >
bool | CGAL::join (const Polygon_2< Kernel, Container > &pgn1, const Polygon_2< Kernel, Container > &pgn2, General_polygon_with_holes_2< Polygon_2< Kernel, Container > > &res, UsePolylines=Tag_true())
| computes the union of two polygons.
template<typename Kernel , typename Container >
bool | CGAL::join (const Polygon_2< Kernel, Container > &pgn1, const Polygon_with_holes_2< Kernel, Container > &pgn2, General_polygon_with_holes_2< Polygon_2< Kernel, Container > > &res)
| computes the union of two polygons.
template<typename Kernel , typename Container , typename UsePolylines >
bool | CGAL::join (const Polygon_2< Kernel, Container > &pgn1, const Polygon_with_holes_2< Kernel, Container > &pgn2, General_polygon_with_holes_2< Polygon_2< Kernel, Container > > &res, UsePolylines=Tag_true())
| computes the union of two polygons.
template<typename Kernel , typename Container >
bool | CGAL::join (const Polygon_with_holes_2< Kernel, Container > &pgn1, const Polygon_2< Kernel, Container > &pgn2, General_polygon_with_holes_2< Polygon_2< Kernel, Container > > &res)
| computes the union of two polygons.
template<typename Kernel , typename Container , typename UsePolylines >
bool | CGAL::join (const Polygon_with_holes_2< Kernel, Container > &pgn1, const Polygon_2< Kernel, Container > &pgn2, General_polygon_with_holes_2< Polygon_2< Kernel, Container > > &res, UsePolylines=Tag_true())
| computes the union of two polygons.
template<typename Kernel , typename Container >
bool | CGAL::join (const Polygon_with_holes_2< Kernel, Container > &pgn1, const Polygon_with_holes_2< Kernel, Container > &pgn2, General_polygon_with_holes_2< Polygon_2< Kernel, Container > > &res)
| computes the union of two polygons with holes.
template<typename Kernel , typename Container , typename UsePolylines >
bool | CGAL::join (const Polygon_with_holes_2< Kernel, Container > &pgn1, const Polygon_with_holes_2< Kernel, Container > &pgn2, General_polygon_with_holes_2< Polygon_2< Kernel, Container > > &res, UsePolylines=Tag_true())
| computes the union of two polygons with holes.
template<typename ArrTraits >
bool | CGAL::join (const General_polygon_2< ArrTraits > &pgn1, const General_polygon_2< ArrTraits > &pgn2, General_polygon_with_holes_2< General_polygon_2< ArrTraits > > &res)
| computes the union of two general polygons.
template<typename ArrTraits >
bool | CGAL::join (const General_polygon_2< ArrTraits > &pgn1, const General_polygon_with_holes_2< General_polygon_2< ArrTraits > > &pgn2, General_polygon_with_holes_2< General_polygon_2< ArrTraits > > &res)
| computes the union of two general polygons.
template<typename ArrTraits >
bool | CGAL::join (const General_polygon_with_holes_2< General_polygon_2< ArrTraits > > &pgn2, const General_polygon_2< ArrTraits > &pgn1, General_polygon_with_holes_2< General_polygon_2< ArrTraits > > &res)
| computes the union of two general polygons.
template<typename Polygon >
bool | CGAL::join (const General_polygon_with_holes_2< Polygon > &pgn1, const General_polygon_with_holes_2< Polygon > &pgn2, General_polygon_with_holes_2< Polygon > &res)
| computes the union of two general polygons with holes.
template<typename InputIterator , typename OutputIterator >
OutputIterator | CGAL::join (InputIterator begin, InputIterator end, OutputIterator oi)
| Given a range of polygons (respectively general polygons) or a range of polygons with holes (respectively general polygons with holes) computes the union of all polygons in the range and inserts the resulting polygons with holes (respectively general polygons with holes) into a container via an output iterator.
template<typename InputIterator , typename OutputIterator , typename UsePolylines >
OutputIterator | CGAL::join (InputIterator begin, InputIterator end, OutputIterator oi, UsePolylines=Tag_true())
| Given a range of polygons (respectively general polygons) or a range of polygons with holes (respectively general polygons with holes) computes the union of all polygons in the range and inserts the resulting polygons with holes (respectively general polygons with holes) into a container via an output iterator.
template<typename InputIterator1 , typename InputIterator2 , typename OutputIterator >
OutputIterator | CGAL::join (InputIterator1 begin1, InputIterator1 end1, InputIterator2 begin2, InputIterator2 end2, OutputIterator oi)
| Given a range of polygons (respectively general polygons) and a range of polygons with holes (respectively general polygons with holes) computes the union of all polygons in the two ranges and inserts the resulting polygons with holes (respectively general polygons with holes) into a container via an output iterator.
template<typename Kernel , typename Container , typename GpsTraits >
bool | CGAL::join (const Polygon_2< Kernel, Container > &pgn1, const Polygon_2< Kernel, Container > &pgn2, General_polygon_with_holes_2< Polygon_2< Kernel, Container > > &res, const GpsTraits &traits)
| computes the union of two polygons.
template<typename Kernel , typename Container , typename GpsTraits >
bool | CGAL::join (const Polygon_2< Kernel, Container > &pgn1, const Polygon_with_holes_2< Kernel, Container > &pgn2, General_polygon_with_holes_2< Polygon_2< Kernel, Container > > &res, const GpsTraits &traits)
| computes the union of two polygons.
template<typename Kernel , typename Container , typename GpsTraits >
bool | CGAL::join (const Polygon_with_holes_2< Kernel, Container > &pgn2, const Polygon_2< Kernel, Container > &pgn1, General_polygon_with_holes_2< Polygon_2< Kernel, Container > > &res, const GpsTraits &traits)
| computes the union of two polygons.
template<typename Kernel , typename Container , typename GpsTraits >
bool | CGAL::join (const Polygon_with_holes_2< Kernel, Container > &pgn2, const Polygon_with_holes_2< Kernel, Container > &pgn1, General_polygon_with_holes_2< Polygon_2< Kernel, Container > > &res, const GpsTraits &traits)
| computes the union of two polygons with holes.
template<typename ArrTraits , typename GpsTraits >
bool | CGAL::join (const General_polygon_2< ArrTraits > &pgn1, const General_polygon_2< ArrTraits > &pgn2, General_polygon_with_holes_2< General_polygon_2< ArrTraits > > &res, const GpsTraits &traits)
| computes the union of two general polygons.
template<typename ArrTraits , typename GpsTraits >
bool | CGAL::join (const General_polygon_2< ArrTraits > &pgn1, const General_polygon_with_holes_2< General_polygon_2< ArrTraits > > &pgn2, General_polygon_with_holes_2< General_polygon_2< ArrTraits > > &res, const GpsTraits &traits)
| computes the union of two general polygons.
template<typename ArrTraits , typename GpsTraits >
bool | CGAL::join (const General_polygon_with_holes_2< General_polygon_2< ArrTraits > > &pgn2, const General_polygon_2< ArrTraits > &pgn1, General_polygon_with_holes_2< General_polygon_2< ArrTraits > > &res, const GpsTraits &traits)
| computes the union of two general polygons.
template<typename Polygon , typename GpsTraits >
bool | CGAL::join (const General_polygon_with_holes_2< Polygon > &pgn1, const General_polygon_with_holes_2< Polygon > &pgn2, General_polygon_with_holes_2< Polygon > &res, const GpsTraits &traits)
| computes the union of two general polygons with holes.
template<typename InputIterator , typename OutputIterator , typename GpsTraits >
OutputIterator | CGAL::join (InputIterator begin, InputIterator end, OutputIterator oi, const GpsTraits &traits)
| Given a range of polygons (respectively general polygons) or a range of polygons with holes (respectively general polygons with holes) computes the union of all polygons in the range and inserts the resulting polygons with holes (respectively general polygons with holes) into a container via an output iterator.
template<typename InputIterator1 , typename InputIterator2 , typename OutputIterator , typename GpsTraits >
OutputIterator | CGAL::join (InputIterator1 begin1, InputIterator1 end1, InputIterator2 begin2, InputIterator2 end2, OutputIterator oi, const GpsTraits &traits)
| Given a range of polygons (respectively general polygons) and a range of polygons with holes (respectively general polygons with holes) computes the union of all polygons in the two ranges and inserts the resulting polygons with holes (respectively general polygons with holes) into a container via an output iterator.
template<typename InputIterator1 , typename InputIterator2 , class OutputIterator , typename UsePolylines >
OutputIterator | CGAL::join (InputIterator1 begin1, InputIterator1 end1, InputIterator2 begin2, InputIterator2 end2, OutputIterator oi, UsePolylines=Tag_true())
| Given a range of polygons (respectively general polygons) and a range of polygons with holes (respectively general polygons with holes) computes the union of all polygons in the two ranges and inserts the resulting polygons with holes (respectively general polygons with holes) into a container via an output iterator.

## Function Documentation

## ◆ join() [1/26]

template<typename ArrTraits >

bool CGAL::join | ( | const General_polygon_2< ArrTraits > & | pgn1,
|  | const General_polygon_2< ArrTraits > & | pgn2,
|  | General_polygon_with_holes_2< General_polygon_2< ArrTraits > > & | res
| ) |  |

`#include <CGAL/Boolean_set_operations_2.h>`

computes the union of two general polygons.

Parameters

  pgn1 | the 1st input polygon.
  pgn2 | the 2nd input polygon.
  res | the resulting union of `pgn1` and `pgn2`.

Returns
  `true` if the two input polygons overlap.

Precondition
  `ArrTraits` must be a model of the concept `AosDirectionalXMonotoneTraits_2`.

## ◆ join() [2/26]

template<typename ArrTraits , typename GpsTraits >

bool CGAL::join | ( | const General_polygon_2< ArrTraits > & | pgn1,
|  | const General_polygon_2< ArrTraits > & | pgn2,
|  | General_polygon_with_holes_2< General_polygon_2< ArrTraits > > & | res,
|  | const GpsTraits & | traits
| ) |  |

`#include <CGAL/Boolean_set_operations_2.h>`

computes the union of two general polygons.

Parameters

  pgn1 | the 1st input polygon.
  pgn2 | the 2nd input polygon.
  res | the resulting union of `pgn1` and `pgn2`.
  traits | a traits object.

Returns
  `true` if the two input polygons overlap.

Precondition
  `ArrTraits` must be a model of the concept `AosDirectionalXMonotoneTraits_2`.
  `GpsTraits` must be a model of the concept `GeneralPolygonSetTraits_2`.

## ◆ join() [3/26]

template<typename ArrTraits >

bool CGAL::join | ( | const General_polygon_2< ArrTraits > & | pgn1,
|  | const General_polygon_with_holes_2< General_polygon_2< ArrTraits > > & | pgn2,
|  | General_polygon_with_holes_2< General_polygon_2< ArrTraits > > & | res
| ) |  |

`#include <CGAL/Boolean_set_operations_2.h>`

computes the union of two general polygons.

Parameters

  pgn1 | the 1st input polygon.
  pgn2 | the 2nd input polygon.
  res | the resulting union of `pgn1` and `pgn2`.

Returns
  `true` if the two input polygons overlap.

Precondition
  `ArrTraits` must be a model of the concept `AosDirectionalXMonotoneTraits_2`.

## ◆ join() [4/26]

template<typename ArrTraits , typename GpsTraits >

bool CGAL::join | ( | const General_polygon_2< ArrTraits > & | pgn1,
|  | const General_polygon_with_holes_2< General_polygon_2< ArrTraits > > & | pgn2,
|  | General_polygon_with_holes_2< General_polygon_2< ArrTraits > > & | res,
|  | const GpsTraits & | traits
| ) |  |

`#include <CGAL/Boolean_set_operations_2.h>`

computes the union of two general polygons.

Parameters

  pgn1 | the 1st input polygon.
  pgn2 | the 2nd input polygon.
  res | the resulting union of `pgn1` and `pgn2`.
  traits | a traits object.

Returns
  `true` if the two input polygons overlap.

Precondition
  `ArrTraits` must be a model of the concept `AosDirectionalXMonotoneTraits_2`.
  `GpsTraits` must be a model of the concept `GeneralPolygonSetTraits_2`.

## ◆ join() [5/26]

template<typename ArrTraits >

bool CGAL::join | ( | const General_polygon_with_holes_2< General_polygon_2< ArrTraits > > & | pgn2,
|  | const General_polygon_2< ArrTraits > & | pgn1,
|  | General_polygon_with_holes_2< General_polygon_2< ArrTraits > > & | res
| ) |  |

`#include <CGAL/Boolean_set_operations_2.h>`

computes the union of two general polygons.

Parameters

  pgn1 | the 1st input polygon.
  pgn2 | the 2nd input polygon.
  res | the resulting union of `pgn1` and `pgn2`.

Returns
  `true` if the two input polygons overlap.

Precondition
  `ArrTraits` must be a model of the concept `AosDirectionalXMonotoneTraits_2`.

## ◆ join() [6/26]

template<typename ArrTraits , typename GpsTraits >

bool CGAL::join | ( | const General_polygon_with_holes_2< General_polygon_2< ArrTraits > > & | pgn2,
|  | const General_polygon_2< ArrTraits > & | pgn1,
|  | General_polygon_with_holes_2< General_polygon_2< ArrTraits > > & | res,
|  | const GpsTraits & | traits
| ) |  |

`#include <CGAL/Boolean_set_operations_2.h>`

computes the union of two general polygons.

Parameters

  pgn1 | the 1st input polygon.
  pgn2 | the 2nd input polygon.
  res | the resulting union of `pgn1` and `pgn2`.
  traits | a traits object.

Returns
  `true` if the two input polygons overlap.

Precondition
  `ArrTraits` must be a model of the concept `AosDirectionalXMonotoneTraits_2`.
  `GpsTraits` must be a model of the concept `GeneralPolygonSetTraits_2`.

## ◆ join() [7/26]

template<typename Polygon >

bool CGAL::join | ( | const General_polygon_with_holes_2< Polygon > & | pgn1,
|  | const General_polygon_with_holes_2< Polygon > & | pgn2,
|  | General_polygon_with_holes_2< Polygon > & | res
| ) |  |

`#include <CGAL/Boolean_set_operations_2.h>`

computes the union of two general polygons with holes.

Parameters

  pgn1 | the 1st input polygon.
  pgn2 | the 2nd input polygon.
  res | the resulting union of `pgn1` and `pgn2`.

Returns
  `true` if the two input polygons overlap.

## ◆ join() [8/26]

template<typename Polygon , typename GpsTraits >

bool CGAL::join | ( | const General_polygon_with_holes_2< Polygon > & | pgn1,
|  | const General_polygon_with_holes_2< Polygon > & | pgn2,
|  | General_polygon_with_holes_2< Polygon > & | res,
|  | const GpsTraits & | traits
| ) |  |

`#include <CGAL/Boolean_set_operations_2.h>`

computes the union of two general polygons with holes.

Parameters

  pgn1 | the 1st input polygon.
  pgn2 | the 2nd input polygon.
  res | the resulting union of `pgn1` and `pgn2`.
  traits | a traits object.

Returns
  `true` if the two input polygons overlap.

Precondition
  `GpsTraits` must be a model of the concept `GeneralPolygonSetTraits_2`.

## ◆ join() [9/26]

template<typename Kernel , typename Container >

bool CGAL::join | ( | const Polygon_2< Kernel, Container > & | pgn1,
|  | const Polygon_2< Kernel, Container > & | pgn2,
|  | General_polygon_with_holes_2< Polygon_2< Kernel, Container > > & | res
| ) |  |

`#include <CGAL/Boolean_set_operations_2.h>`

computes the union of two polygons.

Parameters

  pgn1 | the 1st input polygon.
  pgn2 | the 2nd input polygon.
  res | the resulting union of `pgn1` and `pgn2`.

Returns
  `true` if the two input polygons overlap.

Examples
  Boolean_set_operations_2/set_union.cpp, and Boolean_set_operations_2/simple_join_intersect.cpp.

## ◆ join() [10/26]

template<typename Kernel , typename Container , typename GpsTraits >

bool CGAL::join | ( | const Polygon_2< Kernel, Container > & | pgn1,
|  | const Polygon_2< Kernel, Container > & | pgn2,
|  | General_polygon_with_holes_2< Polygon_2< Kernel, Container > > & | res,
|  | const GpsTraits & | traits
| ) |  |

`#include <CGAL/Boolean_set_operations_2.h>`

computes the union of two polygons.

Parameters

  pgn1 | the 1st input polygon.
  pgn2 | the 2nd input polygon.
  res | the resulting union of `pgn1` and `pgn2`.
  traits | a traits object.

Returns
  `true` if the two input polygons overlap.

Precondition
  `GpsTraits` must be a model of the concept `GeneralPolygonSetTraits_2`.

## ◆ join() [11/26]

template<typename Kernel , typename Container , typename UsePolylines >

bool CGAL::join | ( | const Polygon_2< Kernel, Container > & | pgn1,
|  | const Polygon_2< Kernel, Container > & | pgn2,
|  | General_polygon_with_holes_2< Polygon_2< Kernel, Container > > & | res,
|  | UsePolylines | = `Tag_true()`
| ) |  |

`#include <CGAL/Boolean_set_operations_2.h>`

computes the union of two polygons.

Template Parameters

  UsePolylines | determines whether the boundaries of `pgn1` and `pgn2` are treated as cyclic sequences of single ( \(x\)-monotone) segments or as a cyclic sequences of ( \(x\)-monotone) polylines. If substituted with `CGAL::Tag_true`, which is the default, `pgn1` and `pgn2` are converted into a general polygons bounded by polylines before the operation is actually performed. Then, the resulting general polygons with holes are converted back to standard polygons with holes. If substituted with `CGAL::Tag_false`, `pgn1` and `pgn2` are used as is. Refer to Traits Selection for more information.

Parameters

  pgn1 | the 1st input polygon.
  pgn2 | the 2nd input polygon.
  res | the resulting union of `pgn1` and `pgn2`.

Returns
  `true` if the two input polygons overlap.

## ◆ join() [12/26]

template<typename Kernel , typename Container >

bool CGAL::join | ( | const Polygon_2< Kernel, Container > & | pgn1,
|  | const Polygon_with_holes_2< Kernel, Container > & | pgn2,
|  | General_polygon_with_holes_2< Polygon_2< Kernel, Container > > & | res
| ) |  |

`#include <CGAL/Boolean_set_operations_2.h>`

computes the union of two polygons.

Parameters

  pgn1 | the 1st input polygon.
  pgn2 | the 2nd input polygon.
  res | the resulting union of `pgn1` and `pgn2`.

Returns
  `true` if the two input polygons overlap.

## ◆ join() [13/26]

template<typename Kernel , typename Container , typename GpsTraits >

bool CGAL::join | ( | const Polygon_2< Kernel, Container > & | pgn1,
|  | const Polygon_with_holes_2< Kernel, Container > & | pgn2,
|  | General_polygon_with_holes_2< Polygon_2< Kernel, Container > > & | res,
|  | const GpsTraits & | traits
| ) |  |

`#include <CGAL/Boolean_set_operations_2.h>`

computes the union of two polygons.

Parameters

  pgn1 | the 1st input polygon.
  pgn2 | the 2nd input polygon.
  res | the resulting union of `pgn1` and `pgn2`.
  traits | a traits object.

Returns
  `true` if the two input polygons overlap.

Precondition
  `GpsTraits` must be a model of the concept `GeneralPolygonSetTraits_2`.

## ◆ join() [14/26]

template<typename Kernel , typename Container , typename UsePolylines >

bool CGAL::join | ( | const Polygon_2< Kernel, Container > & | pgn1,
|  | const Polygon_with_holes_2< Kernel, Container > & | pgn2,
|  | General_polygon_with_holes_2< Polygon_2< Kernel, Container > > & | res,
|  | UsePolylines | = `Tag_true()`
| ) |  |

`#include <CGAL/Boolean_set_operations_2.h>`

computes the union of two polygons.

Template Parameters

  UsePolylines | determines whether the boundaries of `pgn1` and `pgn2` are treated as cyclic sequences of single ( \(x\)-monotone) segments or as a cyclic sequences of ( \(x\)-monotone) polylines. If substituted with `CGAL::Tag_true`, which is the default, `pgn1` and `pgn2` are converted into a general polygon and a general polygon with holes, respectively, bounded by polylines before the operation is actually performed. Then, the resulting general polygons with holes are converted back to standard polygons with holes. If substituted with `CGAL::Tag_false`, `pgn1` and `pgn2` are used as is. Refer to Traits Selection for more information.

Parameters

  pgn1 | the 1st input polygon.
  pgn2 | the 2nd input polygon.
  res | the resulting union of `pgn1` and `pgn2`.

Returns
  `true` if the two input polygons overlap.

## ◆ join() [15/26]

template<typename Kernel , typename Container >

bool CGAL::join | ( | const Polygon_with_holes_2< Kernel, Container > & | pgn1,
|  | const Polygon_2< Kernel, Container > & | pgn2,
|  | General_polygon_with_holes_2< Polygon_2< Kernel, Container > > & | res
| ) |  |

`#include <CGAL/Boolean_set_operations_2.h>`

computes the union of two polygons.

Parameters

  pgn1 | the 1st input polygon.
  pgn2 | the 2nd input polygon.
  res | the resulting union of `pgn1` and `pgn2`.

Returns
  `true` if the two input polygons overlap.

## ◆ join() [16/26]

template<typename Kernel , typename Container , typename UsePolylines >

bool CGAL::join | ( | const Polygon_with_holes_2< Kernel, Container > & | pgn1,
|  | const Polygon_2< Kernel, Container > & | pgn2,
|  | General_polygon_with_holes_2< Polygon_2< Kernel, Container > > & | res,
|  | UsePolylines | = `Tag_true()`
| ) |  |

`#include <CGAL/Boolean_set_operations_2.h>`

computes the union of two polygons.

Template Parameters

  UsePolylines | determines whether the boundaries of `pgn1` and `pgn2` are treated as cyclic sequences of single ( \(x\)-monotone) segments or as a cyclic sequences of ( \(x\)-monotone) polylines. If substituted with `CGAL::Tag_true`, which is the default, `pgn1` and `pgn2` are converted into a general polygon with holes and a general polygon, respectively, bounded by polylines before the operation is actually performed. Then, the resulting general polygons with holes are converted back to standard polygons with holes. If substituted with `CGAL::Tag_false`, `pgn1` and `pgn2` are used as is. Refer to Traits Selection for more information.

Parameters

  pgn1 | the 1st input polygon.
  pgn2 | the 2nd input polygon.
  res | the resulting union of `pgn1` and `pgn2`.

Returns
  `true` if the two input polygons overlap.

## ◆ join() [17/26]

template<typename Kernel , typename Container >

bool CGAL::join | ( | const Polygon_with_holes_2< Kernel, Container > & | pgn1,
|  | const Polygon_with_holes_2< Kernel, Container > & | pgn2,
|  | General_polygon_with_holes_2< Polygon_2< Kernel, Container > > & | res
| ) |  |

`#include <CGAL/Boolean_set_operations_2.h>`

computes the union of two polygons with holes.

Parameters

  pgn1 | the 1st input polygon.
  pgn2 | the 2nd input polygon.
  res | the resulting union of `pgn1` and `pgn2`.

Returns
  `true` if the two input polygons overlap.

## ◆ join() [18/26]

template<typename Kernel , typename Container , typename UsePolylines >

bool CGAL::join | ( | const Polygon_with_holes_2< Kernel, Container > & | pgn1,
|  | const Polygon_with_holes_2< Kernel, Container > & | pgn2,
|  | General_polygon_with_holes_2< Polygon_2< Kernel, Container > > & | res,
|  | UsePolylines | = `Tag_true()`
| ) |  |

`#include <CGAL/Boolean_set_operations_2.h>`

computes the union of two polygons with holes.

Template Parameters

  UsePolylines | determines whether the boundaries of `pgn1` and `pgn2` are treated as cyclic sequences of single ( \(x\)-monotone) segments or as a cyclic sequences of ( \(x\)-monotone) polylines. If substituted with `CGAL::Tag_true`, which is the default, `pgn1` and `pgn2` are converted into general polygons with holes, bounded by polylines before the operation is actually performed. Then, the resulting general polygons with holes are converted back to standard polygons with holes. If substituted with `CGAL::Tag_false`, `pgn1` and `pgn2` are used as is. Refer to Traits Selection for more information.

Parameters

  pgn1 | the 1st input polygon.
  pgn2 | the 2nd input polygon.
  res | the resulting union of `pgn1` and `pgn2`.

Returns
  `true` if the two input polygons overlap.

## ◆ join() [19/26]

template<typename Kernel , typename Container , typename GpsTraits >

bool CGAL::join | ( | const Polygon_with_holes_2< Kernel, Container > & | pgn2,
|  | const Polygon_2< Kernel, Container > & | pgn1,
|  | General_polygon_with_holes_2< Polygon_2< Kernel, Container > > & | res,
|  | const GpsTraits & | traits
| ) |  |

`#include <CGAL/Boolean_set_operations_2.h>`

computes the union of two polygons.

Parameters

  pgn1 | the 1st input polygon.
  pgn2 | the 2nd input polygon.
  res | the resulting union of `pgn1` and `pgn2`.
  traits | a traits object.

Returns
  `true` if the two input polygons overlap.

Precondition
  `GpsTraits` must be a model of the concept `GeneralPolygonSetTraits_2`.

## ◆ join() [20/26]

template<typename Kernel , typename Container , typename GpsTraits >

bool CGAL::join | ( | const Polygon_with_holes_2< Kernel, Container > & | pgn2,
|  | const Polygon_with_holes_2< Kernel, Container > & | pgn1,
|  | General_polygon_with_holes_2< Polygon_2< Kernel, Container > > & | res,
|  | const GpsTraits & | traits
| ) |  |

`#include <CGAL/Boolean_set_operations_2.h>`

computes the union of two polygons with holes.

Parameters

  pgn1 | the 1st input polygon.
  pgn2 | the 2nd input polygon.
  res | the resulting union of `pgn1` and `pgn2`.
  traits | a traits object.

Returns
  `true` if the two input polygons overlap.

Precondition
  `GpsTraits` must be a model of the concept `GeneralPolygonSetTraits_2`.

## ◆ join() [21/26]

template<typename InputIterator , typename OutputIterator >

OutputIterator CGAL::join | ( | InputIterator | begin,
|  | InputIterator | end,
|  | OutputIterator | oi
| ) |  |

`#include <CGAL/Boolean_set_operations_2.h>`

Given a range of polygons (respectively general polygons) or a range of polygons with holes (respectively general polygons with holes) computes the union of all polygons in the range and inserts the resulting polygons with holes (respectively general polygons with holes) into a container via an output iterator.

Parameters

  begin | the first iterator of the input range. Its value type is either `Polygon_2` (respectively `General_polygon_2`) or `Polygon_with_holes_2` (respectively `General_polygon_with_holes_2`).
  end | the past-the-end iterator of the input range. Its value type is either `Polygon_2` (respectively `General_polygon_2`) or `Polygon_with_holes_2` (respectively `General_polygon_with_holes_2`).
  oi | the output iterator for the result. Its dereference type must be convertible to `Polygon_with_holes_2` (respectively `General_polygon_with_holes_2`).

Returns
  the past-the-end iterator of the output container.

## ◆ join() [22/26]

template<typename InputIterator , typename OutputIterator , typename GpsTraits >

OutputIterator CGAL::join | ( | InputIterator | begin,
|  | InputIterator | end,
|  | OutputIterator | oi,
|  | const GpsTraits & | traits
| ) |  |

`#include <CGAL/Boolean_set_operations_2.h>`

Given a range of polygons (respectively general polygons) or a range of polygons with holes (respectively general polygons with holes) computes the union of all polygons in the range and inserts the resulting polygons with holes (respectively general polygons with holes) into a container via an output iterator.

Parameters

  begin | the first iterator of the input range. Its value type is either `Polygon_2` (respectively `General_polygon_2`) or `Polygon_with_holes_2` (respectively `General_polygon_with_holes_2`).
  end | the past-the-end iterator of the input range. Its value type is either `Polygon_2` (respectively `General_polygon_2`) or `Polygon_with_holes_2` (respectively `General_polygon_with_holes_2`).
  oi | the output iterator for the result. Its dereference type must be convertible to `Polygon_with_holes_2` (respectively `General_polygon_with_holes_2`).
  traits | a traits object.

Returns
  the past-the-end iterator of the output container.

Precondition
  `GpsTraits` must be a model of the concept `GeneralPolygonSetTraits_2`.

## ◆ join() [23/26]

template<typename InputIterator , typename OutputIterator , typename UsePolylines >

OutputIterator CGAL::join | ( | InputIterator | begin,
|  | InputIterator | end,
|  | OutputIterator | oi,
|  | UsePolylines | = `Tag_true()`
| ) |  |

`#include <CGAL/Boolean_set_operations_2.h>`

Given a range of polygons (respectively general polygons) or a range of polygons with holes (respectively general polygons with holes) computes the union of all polygons in the range and inserts the resulting polygons with holes (respectively general polygons with holes) into a container via an output iterator.

Template Parameters

  UsePolylines | determines whether the boundaries of the polygons in the input range are treated as cyclic sequences of single ( \(x\)-monotone) segments or as a cyclic sequences of ( \(x\)-monotone) polylines. If substituted with `CGAL::Tag_true`, which is the default, the input polygons are converted into general polygon with holes , bounded by polylines before the operation is actually performed. Then, the resulting general polygons with holes are converted back to standard polygons with holes. If substituted with `CGAL::Tag_false`, `pgn1` and `pgn2` are used as is. Refer to Traits Selection for more information.

Parameters

  begin | the first iterator of the input range. Its value type is either `Polygon_2` (respectively `General_polygon_2`) or `Polygon_with_holes_2` (respectively `General_polygon_with_holes_2`).
  end | the past-the-end iterator of the input range. Its value type is either `Polygon_2` (respectively `General_polygon_2`) or `Polygon_with_holes_2` (respectively `General_polygon_with_holes_2`).
  oi | the output iterator for the result. Its dereference type must be convertible to `Polygon_with_holes_2` (respectively `General_polygon_with_holes_2`).

Returns
  the past-the-end iterator of the output container.

## ◆ join() [24/26]

template<typename InputIterator1 , typename InputIterator2 , typename OutputIterator >

OutputIterator CGAL::join | ( | InputIterator1 | begin1,
|  | InputIterator1 | end1,
|  | InputIterator2 | begin2,
|  | InputIterator2 | end2,
|  | OutputIterator | oi
| ) |  |

`#include <CGAL/Boolean_set_operations_2.h>`

Given a range of polygons (respectively general polygons) and a range of polygons with holes (respectively general polygons with holes) computes the union of all polygons in the two ranges and inserts the resulting polygons with holes (respectively general polygons with holes) into a container via an output iterator.

Parameters

  begin1 | the first iterator of the 1st input range. Its value type is `Polygon_2` (respectively `General_polygon_2`).
  end1 | the past-the-end iterator of the 1st input range. Its value type is `Polygon_2` (respectively `General_polygon_2`).
  begin2 | the first iterator of the 2nd input range. Its value type is `Polygon_with_holes_2` (respectively `General_polygon_with_holes_2`).
  end2 | the past-the-end iterator of the 2nd input range. Its value type is `Polygon_with_holes_2` (respectively `General_polygon_with_holes_2`).
  oi | the output iterator for the result. Its dereference type must be convertible to `Polygon_with_holes_2` (respectively `General_polygon_with_holes_2`).

Returns
  the past-the-end iterator of the output container.

## ◆ join() [25/26]

template<typename InputIterator1 , typename InputIterator2 , typename OutputIterator , typename GpsTraits >

OutputIterator CGAL::join | ( | InputIterator1 | begin1,
|  | InputIterator1 | end1,
|  | InputIterator2 | begin2,
|  | InputIterator2 | end2,
|  | OutputIterator | oi,
|  | const GpsTraits & | traits
| ) |  |

`#include <CGAL/Boolean_set_operations_2.h>`

Given a range of polygons (respectively general polygons) and a range of polygons with holes (respectively general polygons with holes) computes the union of all polygons in the two ranges and inserts the resulting polygons with holes (respectively general polygons with holes) into a container via an output iterator.

Parameters

  begin1 | the first iterator of the 1st input range. Its value type is `Polygon_2` (respectively `General_polygon_2`).
  end1 | the past-the-end iterator of the 1st input range. Its value type is `Polygon_2` (respectively `General_polygon_2`).
  begin2 | the first iterator of the 2nd input range. Its value type is `Polygon_with_holes_2` (respectively `General_polygon_with_holes_2`).
  end2 | the past-the-end iterator of the 2nd input range. Its value type is `Polygon_with_holes_2` (respectively `General_polygon_with_holes_2`).
  oi | the output iterator for the result. Its dereference type must be convertible to `Polygon_with_holes_2` (respectively `General_polygon_with_holes_2`).
  traits | a traits object.

Returns
  the past-the-end iterator of the output container.

Precondition
  `GpsTraits` must be a model of the concept `GeneralPolygonSetTraits_2`.

## ◆ join() [26/26]

template<typename InputIterator1 , typename InputIterator2 , class OutputIterator , typename UsePolylines >

OutputIterator CGAL::join | ( | InputIterator1 | begin1,
|  | InputIterator1 | end1,
|  | InputIterator2 | begin2,
|  | InputIterator2 | end2,
|  | OutputIterator | oi,
|  | UsePolylines | = `Tag_true()`
| ) |  |

`#include <CGAL/Boolean_set_operations_2.h>`

Given a range of polygons (respectively general polygons) and a range of polygons with holes (respectively general polygons with holes) computes the union of all polygons in the two ranges and inserts the resulting polygons with holes (respectively general polygons with holes) into a container via an output iterator.

Template Parameters

  UsePolylines | determines whether the boundaries of the polygons in the input ranges are treated as cyclic sequences of single ( \(x\)-monotone) segments or as a cyclic sequences of ( \(x\)-monotone) polylines. If substituted with `CGAL::Tag_true`, which is the default, the input polygons are converted into general polygon with holes , bounded by polylines before the operation is actually performed. Then, the resulting general polygons with holes are converted back to standard polygons with holes. If substituted with `CGAL::Tag_false`, `pgn1` and `pgn2` are used as is. Refer to Traits Selection for more information.

Parameters

  begin1 | the first iterator of the 1st input range. Its value type is `Polygon_2` (respectively `General_polygon_2`).
  end1 | the past-the-end iterator of the 1st input range. Its value type is `Polygon_2` (respectively `General_polygon_2`).
  begin2 | the first iterator of the 2nd input range. Its value type is `Polygon_with_holes_2` (respectively `General_polygon_with_holes_2`).
  end2 | the past-the-end iterator of the 2nd input range. Its value type is `Polygon_with_holes_2` (respectively `General_polygon_with_holes_2`).
  oi | the output iterator for the result. Its dereference type must be convertible to `Polygon_with_holes_2` (respectively `General_polygon_with_holes_2`).

Returns
  the past-the-end iterator of the output container.

Precondition
  `GpsTraits` must be a model of the concept `GeneralPolygonSetTraits_2`.