projects / ceph.git / blame
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| 7c673cae FG |
1 | // Boost.Geometry (aka GGL, Generic Geometry Library) |
| 2 | ||
| 3 | // Copyright (c) 2007-2012 Barend Gehrels, Amsterdam, the Netherlands. | |
| 4 | // Copyright (c) 2008-2012 Bruno Lalande, Paris, France. | |
| 5 | // Copyright (c) 2009-2012 Mateusz Loskot, London, UK. | |
| 6 | ||
| 7 | // Parts of Boost.Geometry are redesigned from Geodan's Geographic Library | |
| 8 | // (geolib/GGL), copyright (c) 1995-2010 Geodan, Amsterdam, the Netherlands. | |
| 9 | ||
| 10 | // Use, modification and distribution is subject to the Boost Software License, | |
| 11 | // Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at | |
| 12 | // http://www.boost.org/LICENSE_1_0.txt) | |
| 13 | ||
| 14 | ||
| 15 | #ifndef BOOST_GEOMETRY_CORE_TOPOLOGICAL_DIMENSION_HPP | |
| 16 | #define BOOST_GEOMETRY_CORE_TOPOLOGICAL_DIMENSION_HPP | |
| 17 | ||
| 18 | ||
| 19 | #include <boost/mpl/int.hpp> | |
| 20 | ||
| 21 | ||
| 22 | #include <boost/geometry/core/tag.hpp> | |
| 23 | #include <boost/geometry/core/tags.hpp> | |
| 24 | ||
| 25 | ||
| 26 | namespace boost { namespace geometry | |
| 27 | { | |
| 28 | ||
| 29 | ||
| 30 | #ifndef DOXYGEN_NO_DISPATCH | |
| 31 | namespace core_dispatch | |
| 32 | { | |
| 33 | ||
| 34 | ||
| 35 | template <typename GeometryTag> | |
| 36 | struct top_dim {}; | |
| 37 | ||
| 38 | ||
| 39 | template <> | |
| 40 | struct top_dim<point_tag> : boost::mpl::int_<0> {}; | |
| 41 | ||
| 42 | ||
| 43 | template <> | |
| 44 | struct top_dim<linestring_tag> : boost::mpl::int_<1> {}; | |
| 45 | ||
| 46 | ||
| 47 | template <> | |
| 48 | struct top_dim<segment_tag> : boost::mpl::int_<1> {}; | |
| 49 | ||
| 50 | ||
| 51 | // ring: topological dimension of two, but some people say: 1 !! | |
| 52 | // NOTE: This is not OGC LinearRing! | |
| 53 | template <> | |
| 54 | struct top_dim<ring_tag> : boost::mpl::int_<2> {}; | |
| 55 | ||
| 56 | ||
| 57 | // TODO: This is wrong! Boxes may have various topological dimensions | |
| 58 | template <> | |
| 59 | struct top_dim<box_tag> : boost::mpl::int_<2> {}; | |
| 60 | ||
| 61 | ||
| 62 | template <> | |
| 63 | struct top_dim<polygon_tag> : boost::mpl::int_<2> {}; | |
| 64 | ||
| 65 | ||
| 66 | template <> | |
| 67 | struct top_dim<multi_point_tag> : boost::mpl::int_<0> {}; | |
| 68 | ||
| 69 | ||
| 70 | template <> | |
| 71 | struct top_dim<multi_linestring_tag> : boost::mpl::int_<1> {}; | |
| 72 | ||
| 73 | ||
| 74 | template <> | |
| 75 | struct top_dim<multi_polygon_tag> : boost::mpl::int_<2> {}; | |
| 76 | ||
| 77 | ||
| 78 | } // namespace core_dispatch | |
| 79 | #endif | |
| 80 | ||
| 81 | ||
| 82 | ||
| 83 | ||
| 84 | ||
| 85 | /*! | |
| 86 | \brief Meta-function returning the topological dimension of a geometry | |
| 87 | \details The topological dimension defines a point as 0-dimensional, | |
| 88 | a linestring as 1-dimensional, | |
| 89 | and a ring or polygon as 2-dimensional. | |
| 90 | \see http://www.math.okstate.edu/mathdept/dynamics/lecnotes/node36.html | |
| 91 | \ingroup core | |
| 92 | */ | |
| 93 | template <typename Geometry> | |
| 94 | struct topological_dimension | |
| 95 | : core_dispatch::top_dim<typename tag<Geometry>::type> {}; | |
| 96 | ||
| 97 | ||
| 98 | }} // namespace boost::geometry | |
| 99 | ||
| 100 | ||
| 101 | #endif // BOOST_GEOMETRY_CORE_TOPOLOGICAL_DIMENSION_HPP |