[/============================================================================
  Boost.Geometry (aka GGL, Generic Geometry Library)

  Copyright (c) 2007-2013 Barend Gehrels, Amsterdam, the Netherlands.
  Copyright (c) 2008-2013 Bruno Lalande, Paris, France.
  Copyright (c) 2009-2013 Mateusz Loskot, London, UK.

  Use, modification and distribution is subject to the Boost Software License,
  Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
  http://www.boost.org/LICENSE_1_0.txt)
=============================================================================/]


[/ Generated by doxygen_xml2qbk 1.1.1, don't change, will be overwritten automatically]
[/ Generated from doxy/doxygen_output/xml/group__num__interior__rings.xml]
[section:num_interior_rings num_interior_rings]

'''<indexterm><primary>num_interior_rings</primary></indexterm>'''
Calculates the number of interior rings of a geometry. 

[heading Description]
The free function num\u005finterior\u005frings calculates the number of interior rings of a geometry. 

[heading Synopsis]
``template<typename Geometry>
std::size_t num_interior_rings(Geometry const & geometry)``

[heading Parameters]

[table
[[Type] [Concept] [Name] [Description] ]
[[Geometry const &] [Any type fulfilling a Geometry Concept ] [geometry] [A model of the specified concept ]]
]


[heading Returns]
The calculated number of interior rings

[heading Header]
Either

`#include <boost/geometry.hpp>`


Or

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

[include reference/algorithms/num_interior_rings.qbk]


[endsect]