[/============================================================================
  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)
=============================================================================/]


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[section:exterior_ring_1 exterior_ring]

'''<indexterm><primary>exterior_ring</primary></indexterm>'''
Function to get the exterior\u005fring ring of a polygon. 

[heading Synopsis]
``template<typename Polygon>
ring_return_type_t< Polygon > exterior_ring(Polygon & polygon)``

[heading Parameters]

[table
[[Type] [Concept] [Name] [Description] ]
[[Polygon &] [polygon type ] [polygon] [the polygon to get the exterior ring from ]]
]


[heading Returns]
a reference to the exterior ring 

[heading Header]
Either

`#include <boost/geometry.hpp>`


Or

`#include <boost/geometry/core/exterior_ring.hpp>`


[endsect]

[section:exterior_ring_1_const_version exterior_ring (const version)]

'''<indexterm><primary>exterior_ring</primary></indexterm>'''
Function to get the exterior ring of a polygon (const version) 

[heading Synopsis]
``template<typename Polygon>
ring_return_type_t< Polygon const  > exterior_ring(Polygon const & polygon)``

[heading Parameters]

[table
[[Type] [Concept] [Name] [Description] ]
[[Polygon const &] [polygon type ] [polygon] [the polygon to get the exterior ring from ]]
]


[heading Returns]
a const reference to the exterior ring

[heading Header]
Either

`#include <boost/geometry.hpp>`


Or

`#include <boost/geometry/core/exterior_ring.hpp>`


[endsect]

