ceph/src/boost/boost/geometry/srs/spheroid.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 // This file was modified by Oracle on 2014, 2016, 2017, 2018.
   8 // Modifications copyright (c) 2014-2018 Oracle and/or its affiliates.
   9
  10 // Contributed and/or modified by Adam Wulkiewicz, on behalf of Oracle
  11
  12 // Parts of Boost.Geometry are redesigned from Geodan's Geographic Library
  13 // (geolib/GGL), copyright (c) 1995-2010 Geodan, Amsterdam, the Netherlands.
  14
  15 // Use, modification and distribution is subject to the Boost Software License,
  16 // Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
  17 // http://www.boost.org/LICENSE_1_0.txt)
  18
  19 #ifndef BOOST_GEOMETRY_SRS_SPHEROID_HPP
  20 #define BOOST_GEOMETRY_SRS_SPHEROID_HPP
  21
  22
  23 #include <cstddef>
  24
  25 #include <boost/static_assert.hpp>
  26
  27 #include <boost/geometry/core/radius.hpp>
  28 #include <boost/geometry/core/tag.hpp>
  29 #include <boost/geometry/core/tags.hpp>
  30
  31
  32 namespace boost { namespace geometry
  33 {
  34
  35 namespace srs
  36 {
  37
  38 /*!
  39     \brief Defines spheroid radius values for use in geographical CS calculations
  40     \ingroup srs
  41     \note See http://en.wikipedia.org/wiki/Figure_of_the_Earth
  42           and http://en.wikipedia.org/wiki/World_Geodetic_System#A_new_World_Geodetic_System:_WGS84
  43     \tparam RadiusType tparam_radius
  44 */
  45 template <typename RadiusType>
  46 class spheroid
  47 {
  48 public:
  49     spheroid(RadiusType const& a, RadiusType const& b)
  50         : m_a(a)
  51         , m_b(b)
  52     {}
  53
  54     spheroid()
  55         : m_a(RadiusType(6378137.0))
  56         , m_b(RadiusType(6356752.3142451793))
  57     {}
  58
  59     template <std::size_t I>
  60     RadiusType get_radius() const
  61     {
  62         BOOST_STATIC_ASSERT(I < 3);
  63
  64         return I < 2 ? m_a : m_b;
  65     }
  66
  67     template <std::size_t I>
  68     void set_radius(RadiusType const& radius)
  69     {
  70         BOOST_STATIC_ASSERT(I < 3);
  71
  72         (I < 2 ? m_a : m_b) = radius;
  73     }
  74
  75 private:
  76     RadiusType m_a, m_b; // equatorial radius, polar radius
  77 };
  78
  79 } // namespace srs
  80
  81 // Traits specializations for spheroid
  82 #ifndef DOXYGEN_NO_TRAITS_SPECIALIZATIONS
  83 namespace traits
  84 {
  85
  86 template <typename RadiusType>
  87 struct tag< srs::spheroid<RadiusType> >
  88 {
  89     typedef srs_spheroid_tag type;
  90 };
  91
  92 template <typename RadiusType>
  93 struct radius_type< srs::spheroid<RadiusType> >
  94 {
  95     typedef RadiusType type;
  96 };
  97
  98 template <typename RadiusType, std::size_t Dimension>
  99 struct radius_access<srs::spheroid<RadiusType>, Dimension>
 100 {
 101     typedef srs::spheroid<RadiusType> spheroid_type;
 102
 103     static inline RadiusType get(spheroid_type const& s)
 104     {
 105         return s.template get_radius<Dimension>();
 106     }
 107
 108     static inline void set(spheroid_type& s, RadiusType const& value)
 109     {
 110         s.template set_radius<Dimension>(value);
 111     }
 112 };
 113
 114 } // namespace traits
 115 #endif // DOXYGEN_NO_TRAITS_SPECIALIZATIONS
 116
 117
 118 }} // namespace boost::geometry
 119
 120
 121 #endif // BOOST_GEOMETRY_SRS_SPHEROID_HPP