ceph/src/boost/boost/geometry/core/is_areal.hpp

   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_IS_AREAL_HPP
  16 #define BOOST_GEOMETRY_CORE_IS_AREAL_HPP
  17
  18
  19 #include <boost/type_traits/integral_constant.hpp>
  20
  21 #include <boost/geometry/core/tag.hpp>
  22 #include <boost/geometry/core/tags.hpp>
  23
  24
  25 namespace boost { namespace geometry
  26 {
  27
  28
  29 #ifndef DOXYGEN_NO_DISPATCH
  30 namespace core_dispatch
  31 {
  32
  33 template <typename GeometryTag> struct is_areal : boost::false_type {};
  34
  35 template <> struct is_areal<ring_tag> : boost::true_type {};
  36 template <> struct is_areal<box_tag> : boost::true_type {};
  37 template <> struct is_areal<polygon_tag> : boost::true_type {};
  38 template <> struct is_areal<multi_polygon_tag> : boost::true_type {};
  39
  40 } // namespace core_dispatch
  41 #endif
  42
  43
  44
  45 /*!
  46     \brief Meta-function defining "true" for areal types (box, (multi)polygon, ring),
  47     \note Used for tag dispatching and meta-function finetuning
  48     \note Also a "ring" has areal properties within Boost.Geometry
  49     \ingroup core
  50 */
  51 template <typename Geometry>
  52 struct is_areal : core_dispatch::is_areal<typename tag<Geometry>::type>
  53 {};
  54
  55
  56 }} // namespace boost::geometry
  57
  58
  59 #endif // BOOST_GEOMETRY_CORE_IS_AREAL_HPP