239 lines
7.6 KiB
C++
239 lines
7.6 KiB
C++
// Boost.Geometry
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// Copyright (c) 2021, Oracle and/or its affiliates.
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// Contributed and/or modified by Adam Wulkiewicz, on behalf of Oracle
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// Licensed under the Boost Software License version 1.0.
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// http://www.boost.org/users/license.html
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#ifndef BOOST_GEOMETRY_STRATEGIES_DISTANCE_BACKWARD_COMPATIBILITY_HPP
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#define BOOST_GEOMETRY_STRATEGIES_DISTANCE_BACKWARD_COMPATIBILITY_HPP
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#include <boost/geometry/strategies/distance/cartesian.hpp>
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#include <boost/geometry/strategies/distance/comparable.hpp>
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#include <boost/geometry/strategies/distance/detail.hpp>
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#include <boost/geometry/strategies/distance/geographic.hpp>
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#include <boost/geometry/strategies/distance/spherical.hpp>
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namespace boost { namespace geometry
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{
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namespace strategies { namespace distance
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{
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#ifndef DOXYGEN_NO_DETAIL
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namespace detail
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{
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template
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<
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typename Strategy,
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typename CSTag,
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typename StrategyTag = typename strategy::distance::services::tag<Strategy>::type
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>
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struct custom_strategy
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{
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BOOST_GEOMETRY_STATIC_ASSERT_FALSE(
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"Not implemented for this Strategy.",
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Strategy);
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};
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// NOTES:
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// - There is no guarantee that any of the custom strategies are compatible with other
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// strategies.
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// - In many cases it is not possible to pass the custom strategy into other strategies.
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// - The old backward compatibility code creating default Pt/Seg strategy from custom
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// Pt/Pt strategy worked the same way. The custom strategy is default-created.
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// - There are two versions of algorithm for Polyseg/Box, one for Seg/Box strategy the
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// other one for Pt/Seg strategy. However there is only one version of algorithm for
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// Seg/Box taking Seg/Box strategy.
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// - Geographic strategies are default-created which means WGS84 spheroid is used.
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// - Currently only Pt/Pt custom strategies are supported because this is what the old
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// backward compatibility code was addressing.
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template <typename Strategy>
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struct custom_strategy<Strategy, cartesian_tag, strategy_tag_distance_point_point>
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: cartesian<>
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{
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custom_strategy(Strategy const& strategy)
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: m_strategy(strategy)
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{}
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template <typename Geometry1, typename Geometry2>
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auto distance(Geometry1 const&, Geometry2 const&,
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enable_if_pp_t<Geometry1, Geometry2> * = nullptr) const
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{
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return m_strategy;
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}
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template <typename Geometry1, typename Geometry2>
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auto distance(Geometry1 const&, Geometry2 const&,
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enable_if_ps_t<Geometry1, Geometry2> * = nullptr) const
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{
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return strategy::distance::projected_point<void, Strategy>();
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}
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template <typename Geometry1, typename Geometry2>
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auto distance(Geometry1 const&, Geometry2 const&,
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enable_if_pb_t<Geometry1, Geometry2> * = nullptr) const
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{
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return strategy::distance::pythagoras_point_box<>();
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}
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template <typename Geometry1, typename Geometry2>
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auto distance(Geometry1 const&, Geometry2 const&,
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enable_if_sb_t<Geometry1, Geometry2> * = nullptr) const
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{
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return strategy::distance::cartesian_segment_box<void, Strategy>();
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}
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template <typename Geometry1, typename Geometry2>
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auto distance(Geometry1 const&, Geometry2 const&,
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enable_if_bb_t<Geometry1, Geometry2> * = nullptr) const
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{
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return strategy::distance::pythagoras_box_box<>();
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}
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private:
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Strategy const& m_strategy;
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};
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template <typename Strategy>
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struct custom_strategy<Strategy, spherical_tag, strategy_tag_distance_point_point>
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: detail::spherical<void, void>
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{
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custom_strategy(Strategy const& strategy)
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: m_strategy(strategy)
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{}
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template <typename Geometry1, typename Geometry2>
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auto distance(Geometry1 const&, Geometry2 const&,
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enable_if_pp_t<Geometry1, Geometry2> * = nullptr) const
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{
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return m_strategy;
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}
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template <typename Geometry1, typename Geometry2>
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auto distance(Geometry1 const&, Geometry2 const&,
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enable_if_ps_t<Geometry1, Geometry2> * = nullptr) const
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{
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return strategy::distance::cross_track<void, Strategy>(m_strategy);
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}
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template <typename Geometry1, typename Geometry2>
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auto distance(Geometry1 const&, Geometry2 const&,
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enable_if_pb_t<Geometry1, Geometry2> * = nullptr) const
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{
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return strategy::distance::cross_track_point_box<void, Strategy>(m_strategy);
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}
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template <typename Geometry1, typename Geometry2>
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auto distance(Geometry1 const&, Geometry2 const&,
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enable_if_sb_t<Geometry1, Geometry2> * = nullptr) const
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{
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return strategy::distance::spherical_segment_box<void, Strategy>(m_strategy);
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}
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template <typename Geometry1, typename Geometry2>
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auto distance(Geometry1 const&, Geometry2 const&,
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enable_if_bb_t<Geometry1, Geometry2> * = nullptr) const
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{
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return strategy::distance::cross_track_box_box<void, Strategy>(m_strategy);
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}
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private:
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Strategy const& m_strategy;
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};
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template <typename Strategy>
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struct custom_strategy<Strategy, geographic_tag, strategy_tag_distance_point_point>
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: geographic<>
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{
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custom_strategy(Strategy const& strategy)
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: m_strategy(strategy)
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{}
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template <typename Geometry1, typename Geometry2>
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auto distance(Geometry1 const&, Geometry2 const&,
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enable_if_pp_t<Geometry1, Geometry2> * = nullptr) const
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{
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return m_strategy;
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}
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template <typename Geometry1, typename Geometry2>
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auto distance(Geometry1 const&, Geometry2 const&,
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enable_if_ps_t<Geometry1, Geometry2> * = nullptr) const
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{
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return strategy::distance::geographic_cross_track<>();
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}
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template <typename Geometry1, typename Geometry2>
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auto distance(Geometry1 const&, Geometry2 const&,
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enable_if_pb_t<Geometry1, Geometry2> * = nullptr) const
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{
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return strategy::distance::geographic_cross_track_point_box<>();
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}
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template <typename Geometry1, typename Geometry2>
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auto distance(Geometry1 const&, Geometry2 const&,
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enable_if_sb_t<Geometry1, Geometry2> * = nullptr) const
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{
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return strategy::distance::geographic_segment_box<>();
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}
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template <typename Geometry1, typename Geometry2>
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auto distance(Geometry1 const&, Geometry2 const&,
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enable_if_bb_t<Geometry1, Geometry2> * = nullptr) const
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{
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return strategy::distance::geographic_cross_track_box_box<>();
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}
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private:
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Strategy const& m_strategy;
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};
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} // namespace detail
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#endif // DOXYGEN_NO_DETAIL
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namespace services
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{
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template <typename Geometry1, typename Geometry2, typename Strategy>
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struct custom_strategy_converter<Geometry1, Geometry2, Strategy, cartesian_tag, cartesian_tag>
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{
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static auto get(Strategy const& strategy)
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{
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return detail::custom_strategy<Strategy, cartesian_tag>(strategy);
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}
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};
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template <typename Geometry1, typename Geometry2, typename Strategy>
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struct custom_strategy_converter<Geometry1, Geometry2, Strategy, spherical_equatorial_tag, spherical_equatorial_tag>
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{
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static auto get(Strategy const& strategy)
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{
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return detail::custom_strategy<Strategy, spherical_tag>(strategy);
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}
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};
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template <typename Geometry1, typename Geometry2, typename Strategy>
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struct custom_strategy_converter<Geometry1, Geometry2, Strategy, geographic_tag, geographic_tag>
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{
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static auto get(Strategy const& strategy)
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{
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return detail::custom_strategy<Strategy, geographic_tag>(strategy);
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}
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};
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} // namespace services
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}} // namespace strategies::distance
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}} // namespace boost::geometry
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#endif // BOOST_GEOMETRY_STRATEGIES_DISTANCE_BACKWARD_COMPATIBILITY_HPP
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