[/============================================================================
  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/structboost_1_1geometry_1_1tag.xml]
[section:tag tag]

'''<indexterm><primary>tag</primary></indexterm>'''
Metafunction defining [*type] as the tag of the specified geometry type. 

[heading Description]
With Boost.Geometry, tags are the driving force of the tag dispatching mechanism. The tag metafunction is therefore used in every free function. 

[heading Synopsis]
``template<typename Geometry>
struct tag
{
  // ...
};
``

[heading Template parameter(s)]
[table
[[Parameter] [Description]]
[[typename Geometry] [Any type fulfilling a Geometry Concept]]
]

[heading Header]
Either

`#include <boost/geometry.hpp>`


Or

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

[include reference/core/tag.qbk]

[endsect]