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+// Boost.Geometry (aka GGL, Generic Geometry Library)
+
+// Copyright (c) 2007-2016 Barend Gehrels, Amsterdam, the Netherlands.
+
+// This file was modified by Oracle on 2014-2017.
+// Modifications copyright (c) 2014-2017 Oracle and/or its affiliates.
+
+// Contributed and/or modified by Adam Wulkiewicz, on behalf of Oracle
+
+// Use, modification and distribution is subject to the Boost Software License,
+// Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
+// http://www.boost.org/LICENSE_1_0.txt)
+
+
+#ifndef BOOST_GEOMETRY_STRATEGIES_GEOGRAPHIC_DISTANCE_HPP
+#define BOOST_GEOMETRY_STRATEGIES_GEOGRAPHIC_DISTANCE_HPP
+
+
+#include <boost/geometry/core/coordinate_type.hpp>
+#include <boost/geometry/core/radian_access.hpp>
+#include <boost/geometry/core/radius.hpp>
+#include <boost/geometry/core/srs.hpp>
+
+#include <boost/geometry/formulas/andoyer_inverse.hpp>
+#include <boost/geometry/formulas/flattening.hpp>
+
+#include <boost/geometry/strategies/distance.hpp>
+#include <boost/geometry/strategies/geographic/parameters.hpp>
+
+#include <boost/geometry/util/math.hpp>
+#include <boost/geometry/util/promote_floating_point.hpp>
+#include <boost/geometry/util/select_calculation_type.hpp>
+
+
+namespace boost { namespace geometry
+{
+
+namespace strategy { namespace distance
+{
+
+template
+<
+ typename FormulaPolicy = strategy::andoyer,
+ typename Spheroid = srs::spheroid<double>,
+ typename CalculationType = void
+>
+class geographic
+{
+public :
+ template <typename Point1, typename Point2>
+ struct calculation_type
+ : promote_floating_point
+ <
+ typename select_calculation_type
+ <
+ Point1,
+ Point2,
+ CalculationType
+ >::type
+ >
+ {};
+
+ typedef Spheroid model_type;
+
+ inline geographic()
+ : m_spheroid()
+ {}
+
+ explicit inline geographic(Spheroid const& spheroid)
+ : m_spheroid(spheroid)
+ {}
+
+ template <typename Point1, typename Point2>
+ inline typename calculation_type<Point1, Point2>::type
+ apply(Point1 const& point1, Point2 const& point2) const
+ {
+ return FormulaPolicy::template inverse
+ <
+ typename calculation_type<Point1, Point2>::type,
+ true, false, false, false, false
+ >::apply(get_as_radian<0>(point1), get_as_radian<1>(point1),
+ get_as_radian<0>(point2), get_as_radian<1>(point2),
+ m_spheroid).distance;
+ }
+
+ inline Spheroid const& model() const
+ {
+ return m_spheroid;
+ }
+
+private :
+ Spheroid m_spheroid;
+};
+
+
+#ifndef DOXYGEN_NO_STRATEGY_SPECIALIZATIONS
+namespace services
+{
+
+template
+<
+ typename FormulaPolicy,
+ typename Spheroid,
+ typename CalculationType
+>
+struct tag<geographic<FormulaPolicy, Spheroid, CalculationType> >
+{
+ typedef strategy_tag_distance_point_point type;
+};
+
+
+template
+<
+ typename FormulaPolicy,
+ typename Spheroid,
+ typename CalculationType,
+ typename P1,
+ typename P2
+>
+struct return_type<geographic<FormulaPolicy, Spheroid, CalculationType>, P1, P2>
+ : geographic<FormulaPolicy, Spheroid, CalculationType>::template calculation_type<P1, P2>
+{};
+
+
+template
+<
+ typename FormulaPolicy,
+ typename Spheroid,
+ typename CalculationType
+>
+struct comparable_type<geographic<FormulaPolicy, Spheroid, CalculationType> >
+{
+ typedef geographic<FormulaPolicy, Spheroid, CalculationType> type;
+};
+
+
+template
+<
+ typename FormulaPolicy,
+ typename Spheroid,
+ typename CalculationType
+>
+struct get_comparable<geographic<FormulaPolicy, Spheroid, CalculationType> >
+{
+ static inline geographic<FormulaPolicy, Spheroid, CalculationType>
+ apply(geographic<FormulaPolicy, Spheroid, CalculationType> const& input)
+ {
+ return input;
+ }
+};
+
+template
+<
+ typename FormulaPolicy,
+ typename Spheroid,
+ typename CalculationType,
+ typename P1,
+ typename P2
+>
+struct result_from_distance<geographic<FormulaPolicy, Spheroid, CalculationType>, P1, P2>
+{
+ template <typename T>
+ static inline typename return_type<geographic<FormulaPolicy, Spheroid, CalculationType>, P1, P2>::type
+ apply(geographic<FormulaPolicy, Spheroid, CalculationType> const& , T const& value)
+ {
+ return value;
+ }
+};
+
+
+template <typename Point1, typename Point2>
+struct default_strategy<point_tag, point_tag, Point1, Point2, geographic_tag, geographic_tag>
+{
+ typedef strategy::distance::geographic
+ <
+ strategy::andoyer,
+ srs::spheroid
+ <
+ typename select_coordinate_type<Point1, Point2>::type
+ >
+ > type;
+};
+
+
+} // namespace services
+#endif // DOXYGEN_NO_STRATEGY_SPECIALIZATIONS
+
+
+}} // namespace strategy::distance
+
+
+}} // namespace boost::geometry
+
+
+#endif // BOOST_GEOMETRY_STRATEGIES_GEOGRAPHIC_DISTANCE_HPP