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// Boost.Geometry (aka GGL, Generic Geometry Library)
// Copyright (c) 2007-2012 Barend Gehrels, Amsterdam, the Netherlands.
// Copyright (c) 2008-2012 Bruno Lalande, Paris, France.
// Copyright (c) 2009-2012 Mateusz Loskot, London, UK.
// Parts of Boost.Geometry are redesigned from Geodan's Geographic Library
// (geolib/GGL), copyright (c) 1995-2010 Geodan, Amsterdam, the Netherlands.
// 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)
#ifndef BOOST_GEOMETRY_CORE_TAGS_HPP
#define BOOST_GEOMETRY_CORE_TAGS_HPP
namespace boost { namespace geometry
{
// Tags defining strategies linked to coordinate systems
/// Tag used for casting spherical/geographic coordinate systems
struct spherical_tag {};
/// Tag indicating Cartesian coordinate system family (cartesian,epsg)
struct cartesian_tag {};
/// Tag indicating Spherical polar coordinate system family
struct spherical_polar_tag : spherical_tag {};
/// Tag indicating Spherical equatorial coordinate system family
struct spherical_equatorial_tag : spherical_tag {};
/// Tag indicating Geographic coordinate system family (geographic)
struct geographic_tag : spherical_tag {};
// Tags defining tag hierarchy
/// For single-geometries (point, linestring, polygon, box, ring, segment)
struct single_tag {};
/// For multiple-geometries (multi_point, multi_linestring, multi_polygon)
struct multi_tag {};
/// For point-like types (point, multi_point)
struct pointlike_tag {};
/// For linear types (linestring, multi-linestring, segment)
struct linear_tag {};
/// For areal types (polygon, multi_polygon, box, ring)
struct areal_tag {};
// Subset of areal types (polygon, multi_polygon, ring)
struct polygonal_tag : areal_tag {};
/// For volume types (also box (?), polyhedron)
struct volumetric_tag {};
// Tags defining geometry types
/// "default" tag
struct geometry_not_recognized_tag {};
/// OGC Point identifying tag
struct point_tag : single_tag, pointlike_tag {};
/// OGC Linestring identifying tag
struct linestring_tag : single_tag, linear_tag {};
/// OGC Polygon identifying tag
struct polygon_tag : single_tag, polygonal_tag {};
/// Convenience (linear) ring identifying tag
struct ring_tag : single_tag, polygonal_tag {};
/// Convenience 2D or 3D box (mbr / aabb) identifying tag
struct box_tag : single_tag, areal_tag {};
/// Convenience segment (2-points) identifying tag
struct segment_tag : single_tag, linear_tag {};
/// OGC Multi point identifying tag
struct multi_point_tag : multi_tag, pointlike_tag {};
/// OGC Multi linestring identifying tag
struct multi_linestring_tag : multi_tag, linear_tag {};
/// OGC Multi polygon identifying tag
struct multi_polygon_tag : multi_tag, polygonal_tag {};
/// OGC Geometry Collection identifying tag
struct geometry_collection_tag : multi_tag {};
/*!
\brief Meta-function to get for a tag of a multi-geometry
the tag of the corresponding single-geometry
*/
template <typename Tag>
struct single_tag_of
{};
#ifndef DOXYGEN_NO_DETAIL
template <>
struct single_tag_of<multi_point_tag>
{
typedef point_tag type;
};
template <>
struct single_tag_of<multi_linestring_tag>
{
typedef linestring_tag type;
};
template <>
struct single_tag_of<multi_polygon_tag>
{
typedef polygon_tag type;
};
#endif
}} // namespace boost::geometry
#endif // BOOST_GEOMETRY_CORE_TAGS_HPP
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