ceph/src/boost/boost/geometry/views/detail/two_dimensional_view.hpp

   1 // Boost.Geometry (aka GGL, Generic Geometry Library)
   2
   3 // Copyright (c) 2015-2020, Oracle and/or its affiliates.
   4
   5 // Contributed and/or modified by Menelaos Karavelas, on behalf of Oracle
   6 // Contributed and/or modified by Adam Wulkiewicz, on behalf of Oracle
   7
   8 // Licensed under the Boost Software License version 1.0.
   9 // http://www.boost.org/users/license.html
  10
  11 #ifndef BOOST_GEOMETRY_VIEWS_DETAIL_TWO_DIMENSIONAL_VIEW_HPP
  12 #define BOOST_GEOMETRY_VIEWS_DETAIL_TWO_DIMENSIONAL_VIEW_HPP
  13
  14 #include <cstddef>
  15
  16 #include <boost/geometry/core/access.hpp>
  17 #include <boost/geometry/core/coordinate_type.hpp>
  18 #include <boost/geometry/core/coordinate_system.hpp>
  19 #include <boost/geometry/core/coordinate_dimension.hpp>
  20 #include <boost/geometry/core/point_type.hpp>
  21 #include <boost/geometry/core/static_assert.hpp>
  22 #include <boost/geometry/core/tag.hpp>
  23 #include <boost/geometry/core/tags.hpp>
  24
  25 #include <boost/geometry/algorithms/not_implemented.hpp>
  26
  27
  28 namespace boost { namespace geometry
  29 {
  30
  31 #ifndef DOXYGEN_NO_DETAIL
  32 namespace detail
  33 {
  34
  35 template
  36 <
  37     typename Geometry,
  38     std::size_t Dimension1 = 0,
  39     std::size_t Dimension2 = 1,
  40     typename Tag = typename tag<Geometry>::type
  41 >
  42 struct two_dimensional_view
  43     : not_implemented<Tag>
  44 {};
  45
  46
  47 // View that enables to choose two dimensions of a point and see it as
  48 // a two-dimensional point
  49 template <typename Point, std::size_t Dimension1, std::size_t Dimension2>
  50 struct two_dimensional_view<Point, Dimension1, Dimension2, point_tag>
  51 {
  52     BOOST_GEOMETRY_STATIC_ASSERT(
  53         (Dimension1 < dimension<Point>::value),
  54         "Coordinate Dimension1 is larger than Point's dimension.",
  55         std::integral_constant<std::size_t, Dimension1>);
  56
  57     BOOST_GEOMETRY_STATIC_ASSERT(
  58         (Dimension2 < dimension<Point>::value),
  59         "Coordinate Dimension2 is larger than Point's dimension.",
  60         std::integral_constant<std::size_t, Dimension2>);
  61
  62     two_dimensional_view(Point& point)
  63         : m_point(point)
  64     {}
  65
  66     Point& m_point;
  67 };
  68
  69
  70 } // namespace detail
  71 #endif // DOXYGEN_NO_DETAIL
  72
  73
  74 #ifndef DOXYGEN_NO_TRAITS_SPECIALIZATIONS
  75 namespace traits
  76 {
  77
  78
  79 template <typename Point, std::size_t Dimension1, std::size_t Dimension2>
  80 struct tag
  81     <
  82         geometry::detail::two_dimensional_view
  83             <
  84                 Point, Dimension1, Dimension2, point_tag
  85             >
  86     >
  87 {
  88     typedef point_tag type;
  89 };
  90
  91 template <typename Point, std::size_t Dimension1, std::size_t Dimension2>
  92 struct coordinate_system
  93     <
  94         geometry::detail::two_dimensional_view
  95             <
  96                 Point, Dimension1, Dimension2, point_tag
  97             >
  98     > : coordinate_system<typename geometry::point_type<Point>::type>
  99 {};
 100
 101 template <typename Point, std::size_t Dimension1, std::size_t Dimension2>
 102 struct coordinate_type
 103     <
 104         geometry::detail::two_dimensional_view
 105             <
 106                 Point, Dimension1, Dimension2, point_tag
 107             >
 108     > : coordinate_type<typename geometry::point_type<Point>::type>
 109 {};
 110
 111 template <typename Point, std::size_t Dimension1, std::size_t Dimension2>
 112 struct dimension
 113     <
 114         geometry::detail::two_dimensional_view
 115             <
 116                 Point, Dimension1, Dimension2, point_tag
 117             >
 118     > : std::integral_constant<std::size_t, 2>
 119 {};
 120
 121 template <typename Point, std::size_t Dimension1, std::size_t Dimension2>
 122 struct point_type
 123     <
 124         geometry::detail::two_dimensional_view
 125             <
 126                 Point, Dimension1, Dimension2, point_tag
 127             >
 128     >
 129 {
 130     typedef typename geometry::point_type<Point>::type type;
 131 };
 132
 133
 134 template <typename Point, std::size_t Dimension1, std::size_t Dimension2>
 135 struct access
 136     <
 137         geometry::detail::two_dimensional_view
 138             <
 139                 Point, Dimension1, Dimension2, point_tag
 140             >,
 141         0
 142     >
 143 {
 144     typedef typename geometry::coordinate_type<Point>::type coordinate_type;
 145     typedef geometry::detail::two_dimensional_view
 146         <
 147             Point, Dimension1, Dimension2, point_tag
 148         > view_type;
 149
 150     static inline coordinate_type get(view_type const& view)
 151     {
 152         return geometry::get<Dimension1>(view.m_point);
 153     }
 154
 155     static inline void set(view_type& view, coordinate_type const& value)
 156     {
 157         geometry::set<Dimension1>(view.m_point, value);
 158     }
 159 };
 160
 161 template <typename Point, std::size_t Dimension1, std::size_t Dimension2>
 162 struct access
 163     <
 164         geometry::detail::two_dimensional_view
 165             <
 166                 Point, Dimension1, Dimension2, point_tag
 167             >,
 168         1
 169     >
 170 {
 171     typedef typename geometry::coordinate_type<Point>::type coordinate_type;
 172     typedef geometry::detail::two_dimensional_view
 173         <
 174             Point, Dimension1, Dimension2, point_tag
 175         > view_type;
 176
 177     static inline coordinate_type get(view_type const& view)
 178     {
 179         return geometry::get<Dimension2>(view.m_point);
 180     }
 181
 182     static inline void set(view_type& view, coordinate_type const& value)
 183     {
 184         geometry::set<Dimension2>(view.m_point, value);
 185     }
 186 };
 187
 188
 189 } // namespace traits
 190 #endif // DOXYGEN_NO_TRAITS_SPECIALIZATIONS
 191
 192 }} // namespace boost::geometry
 193
 194
 195 #endif // BOOST_GEOMETRY_VIEWS_DETAIL_TWO_DIMENSIONAL_VIEW_HPP