...one of the most highly
regarded and expertly designed C++ library projects in the
world.

— Herb Sutter and Andrei
Alexandrescu, C++
Coding Standards

Calculates the perimeter of a geometry.

The function perimeter returns the perimeter of a geometry, using the default distance-calculation-strategy

template<typename Geometry> default_length_result<Geometry>::type perimeter(Geometry const & geometry)

Type |
Concept |
Name |
Description |
---|---|---|---|

Geometry const & |
Any type fulfilling a Geometry Concept |
geometry |
A model of the specified concept |

The calculated perimeter

Either

`#include <boost/geometry.hpp>`

Or

`#include <boost/geometry/algorithms/perimeter.hpp>`

The function perimeter is not defined by OGC.

Note | |
---|---|

PostGIS contains an algorithm with the same name and the same functionality. See the PostGIS documentation. |

Case |
Behavior |
---|---|

pointlike (e.g. point) |
Returns zero |

linear (e.g. linestring) |
Returns zero |

areal (e.g. polygon) |
Returns the perimeter |

Linear