ceph/src/boost/boost/geometry/strategies/geographic/distance_karney.hpp

   1 // Boost.Geometry
   2
   3 // Copyright (c) 2018 Adeel Ahmad, Islamabad, Pakistan.
   4
   5 // Contributed and/or modified by Adeel Ahmad, as part of Google Summer of Code 2018 program.
   6
   7 // Use, modification and distribution is subject to the Boost Software License,
   8 // Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
   9 // http://www.boost.org/LICENSE_1_0.txt)
  10
  11 #ifndef BOOST_GEOMETRY_STRATEGIES_GEOGRAPHIC_KARNEY_HPP
  12 #define BOOST_GEOMETRY_STRATEGIES_GEOGRAPHIC_KARNEY_HPP
  13
  14
  15 #include <boost/geometry/strategies/geographic/distance.hpp>
  16 #include <boost/geometry/strategies/geographic/parameters.hpp>
  17
  18
  19 namespace boost { namespace geometry
  20 {
  21
  22 namespace strategy { namespace distance
  23 {
  24
  25 /*!
  26 \brief The solution of the inverse problem of geodesics on latlong coordinates,
  27        after Karney (2011).
  28 \ingroup distance
  29 \tparam Spheroid The reference spheroid model
  30 \tparam CalculationType \tparam_calculation
  31 \author See
  32 - Charles F.F Karney, Algorithms for geodesics, 2011
  33 https://arxiv.org/pdf/1109.4448.pdf
  34 */
  35 template
  36 <
  37     typename Spheroid = srs::spheroid<double>,
  38     typename CalculationType = void
  39 >
  40 class karney
  41     : public strategy::distance::geographic
  42         <
  43             strategy::karney, Spheroid, CalculationType
  44         >
  45 {
  46     typedef strategy::distance::geographic
  47         <
  48             strategy::karney, Spheroid, CalculationType
  49         > base_type;
  50
  51 public:
  52     inline karney()
  53         : base_type()
  54     {}
  55
  56     explicit inline karney(Spheroid const& spheroid)
  57         : base_type(spheroid)
  58     {}
  59 };
  60
  61 #ifndef DOXYGEN_NO_STRATEGY_SPECIALIZATIONS
  62 namespace services
  63 {
  64
  65 template <typename Spheroid, typename CalculationType>
  66 struct tag<karney<Spheroid, CalculationType> >
  67 {
  68     typedef strategy_tag_distance_point_point type;
  69 };
  70
  71
  72 template <typename Spheroid, typename CalculationType, typename P1, typename P2>
  73 struct return_type<karney<Spheroid, CalculationType>, P1, P2>
  74     : karney<Spheroid, CalculationType>::template calculation_type<P1, P2>
  75 {};
  76
  77
  78 template <typename Spheroid, typename CalculationType>
  79 struct comparable_type<karney<Spheroid, CalculationType> >
  80 {
  81     typedef karney<Spheroid, CalculationType> type;
  82 };
  83
  84
  85 template <typename Spheroid, typename CalculationType>
  86 struct get_comparable<karney<Spheroid, CalculationType> >
  87 {
  88     static inline karney<Spheroid, CalculationType> apply(karney<Spheroid, CalculationType> const& input)
  89     {
  90         return input;
  91     }
  92 };
  93
  94 template <typename Spheroid, typename CalculationType, typename P1, typename P2>
  95 struct result_from_distance<karney<Spheroid, CalculationType>, P1, P2 >
  96 {
  97     template <typename T>
  98     static inline typename return_type<karney<Spheroid, CalculationType>, P1, P2>::type
  99         apply(karney<Spheroid, CalculationType> const& , T const& value)
 100     {
 101         return value;
 102     }
 103 };
 104
 105
 106 } // namespace services
 107 #endif // DOXYGEN_NO_STRATEGY_SPECIALIZATIONS
 108
 109
 110 }} // namespace strategy::distance
 111
 112
 113 }} // namespace boost::geometry
 114
 115
 116 #endif // BOOST_GEOMETRY_STRATEGIES_GEOGRAPHIC_KARNEY_HPP