ceph/src/boost/boost/geometry/geometries/helper_geometry.hpp

   1 // Boost.Geometry (aka GGL, Generic Geometry Library)
   2
   3 // Copyright (c) 2015-2017, 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_GEOMETRIES_HELPER_GEOMETRY_HPP
  12 #define BOOST_GEOMETRY_GEOMETRIES_HELPER_GEOMETRY_HPP
  13
  14 #include <boost/mpl/assert.hpp>
  15
  16 #include <boost/geometry/core/cs.hpp>
  17 #include <boost/geometry/core/coordinate_dimension.hpp>
  18 #include <boost/geometry/core/coordinate_type.hpp>
  19 #include <boost/geometry/core/point_type.hpp>
  20 #include <boost/geometry/core/tag.hpp>
  21 #include <boost/geometry/core/tags.hpp>
  22
  23 #include <boost/geometry/geometries/box.hpp>
  24 #include <boost/geometry/geometries/point.hpp>
  25
  26 #include <boost/geometry/algorithms/not_implemented.hpp>
  27
  28
  29 namespace boost { namespace geometry
  30 {
  31
  32 namespace detail { namespace helper_geometries
  33 {
  34
  35 template
  36 <
  37     typename Point,
  38     typename NewCoordinateType,
  39     typename NewUnits,
  40     typename CS_Tag = typename cs_tag<Point>::type
  41 >
  42 struct helper_point
  43 {
  44     typedef model::point
  45         <
  46             NewCoordinateType,
  47             dimension<Point>::value,
  48             typename cs_tag_to_coordinate_system<NewUnits, CS_Tag>::type
  49         > type;
  50 };
  51
  52
  53 }} // detail::helper_geometries
  54
  55
  56 namespace detail_dispatch
  57 {
  58
  59
  60 template
  61 <
  62     typename Geometry,
  63     typename NewCoordinateType,
  64     typename NewUnits,
  65     typename Tag = typename tag<Geometry>::type>
  66 struct helper_geometry : not_implemented<Geometry>
  67 {};
  68
  69
  70 template <typename Point, typename NewCoordinateType, typename NewUnits>
  71 struct helper_geometry<Point, NewCoordinateType, NewUnits, point_tag>
  72 {
  73     typedef typename detail::helper_geometries::helper_point
  74         <
  75             Point, NewCoordinateType, NewUnits
  76         >::type type;
  77 };
  78
  79
  80 template <typename Box, typename NewCoordinateType, typename NewUnits>
  81 struct helper_geometry<Box, NewCoordinateType, NewUnits, box_tag>
  82 {
  83     typedef model::box
  84         <
  85             typename helper_geometry
  86                 <
  87                     typename point_type<Box>::type, NewCoordinateType, NewUnits
  88                 >::type
  89         > type;
  90 };
  91
  92
  93 } // detail_dispatch
  94
  95
  96 // Meta-function that provides a new helper geometry of the same kind as
  97 // the input geometry and the same coordinate system type,
  98 // but with a possibly different coordinate type and coordinate system units
  99 template
 100 <
 101     typename Geometry,
 102     typename NewCoordinateType = typename coordinate_type<Geometry>::type,
 103     typename NewUnits = typename detail::cs_angular_units<Geometry>::type
 104 >
 105 struct helper_geometry
 106 {
 107     typedef typename detail_dispatch::helper_geometry
 108         <
 109             Geometry, NewCoordinateType, NewUnits
 110         >::type type;
 111 };
 112
 113
 114 }} // namespace boost::geometry
 115
 116 #endif // BOOST_GEOMETRY_GEOMETRIES_HELPER_GEOMETRY_HPP