// Boost.Geometry (aka GGL, Generic Geometry Library)
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// Copyright (c) 2007-2015 Barend Gehrels, Amsterdam, the Netherlands.
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// Copyright (c) 2008-2015 Bruno Lalande, Paris, France.
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// Copyright (c) 2009-2015 Mateusz Loskot, London, UK.
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// Copyright (c) 2014-2015 Samuel Debionne, Grenoble, France.
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// This file was modified by Oracle on 2015-2020.
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// Modifications copyright (c) 2015-2020, Oracle and/or its affiliates.
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// Contributed and/or modified by Vissarion Fysikopoulos, on behalf of Oracle
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// Contributed and/or modified by Menelaos Karavelas, on behalf of Oracle
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// Contributed and/or modified by Adam Wulkiewicz, on behalf of Oracle
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// Parts of Boost.Geometry are redesigned from Geodan's Geographic Library
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// (geolib/GGL), copyright (c) 1995-2010 Geodan, Amsterdam, the Netherlands.
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// Distributed under the Boost Software License, Version 1.0.
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// (See accompanying file LICENSE_1_0.txt or copy at
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// http://www.boost.org/LICENSE_1_0.txt)
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#ifndef BOOST_GEOMETRY_STRATEGY_SPHERICAL_EXPAND_POINT_HPP
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#define BOOST_GEOMETRY_STRATEGY_SPHERICAL_EXPAND_POINT_HPP
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#include <algorithm>
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#include <cstddef>
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#include <functional>
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#include <type_traits>
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#include <boost/geometry/core/access.hpp>
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#include <boost/geometry/core/coordinate_dimension.hpp>
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#include <boost/geometry/core/coordinate_system.hpp>
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#include <boost/geometry/core/coordinate_type.hpp>
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#include <boost/geometry/core/tags.hpp>
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#include <boost/geometry/util/is_inverse_spheroidal_coordinates.hpp>
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#include <boost/geometry/util/math.hpp>
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#include <boost/geometry/util/select_coordinate_type.hpp>
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#include <boost/geometry/algorithms/detail/normalize.hpp>
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#include <boost/geometry/algorithms/detail/envelope/transform_units.hpp>
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#include <boost/geometry/strategy/expand.hpp>
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#include <boost/geometry/strategy/cartesian/expand_point.hpp>
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namespace boost { namespace geometry
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{
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namespace strategy { namespace expand
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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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// implementation for the spherical and geographic coordinate systems
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template <std::size_t DimensionCount, bool IsEquatorial>
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struct point_loop_on_spheroid
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{
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template <typename Box, typename Point>
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static inline void apply(Box& box, Point const& point)
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{
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typedef typename point_type<Box>::type box_point_type;
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typedef typename coordinate_type<Box>::type box_coordinate_type;
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typedef typename geometry::detail::cs_angular_units<Box>::type units_type;
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typedef math::detail::constants_on_spheroid
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<
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box_coordinate_type,
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units_type
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> constants;
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// normalize input point and input box
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Point p_normalized;
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strategy::normalize::spherical_point::apply(point, p_normalized);
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// transform input point to be of the same type as the box point
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box_point_type box_point;
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geometry::detail::envelope::transform_units(p_normalized, box_point);
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if (is_inverse_spheroidal_coordinates(box))
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{
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geometry::set_from_radian<min_corner, 0>(box, geometry::get_as_radian<0>(p_normalized));
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geometry::set_from_radian<min_corner, 1>(box, geometry::get_as_radian<1>(p_normalized));
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geometry::set_from_radian<max_corner, 0>(box, geometry::get_as_radian<0>(p_normalized));
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geometry::set_from_radian<max_corner, 1>(box, geometry::get_as_radian<1>(p_normalized));
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} else {
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strategy::normalize::spherical_box::apply(box, box);
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box_coordinate_type p_lon = geometry::get<0>(box_point);
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box_coordinate_type p_lat = geometry::get<1>(box_point);
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typename coordinate_type<Box>::type
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b_lon_min = geometry::get<min_corner, 0>(box),
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b_lat_min = geometry::get<min_corner, 1>(box),
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b_lon_max = geometry::get<max_corner, 0>(box),
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b_lat_max = geometry::get<max_corner, 1>(box);
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if (math::is_latitude_pole<units_type, IsEquatorial>(p_lat))
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{
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// the point of expansion is the either the north or the
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// south pole; the only important coordinate here is the
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// pole's latitude, as the longitude can be anything;
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// we, thus, take into account the point's latitude only and return
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geometry::set<min_corner, 1>(box, (std::min)(p_lat, b_lat_min));
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geometry::set<max_corner, 1>(box, (std::max)(p_lat, b_lat_max));
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return;
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}
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if (math::equals(b_lat_min, b_lat_max)
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&& math::is_latitude_pole<units_type, IsEquatorial>(b_lat_min))
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{
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// the box degenerates to either the north or the south pole;
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// the only important coordinate here is the pole's latitude,
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// as the longitude can be anything;
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// we thus take into account the box's latitude only and return
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geometry::set<min_corner, 0>(box, p_lon);
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geometry::set<min_corner, 1>(box, (std::min)(p_lat, b_lat_min));
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geometry::set<max_corner, 0>(box, p_lon);
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geometry::set<max_corner, 1>(box, (std::max)(p_lat, b_lat_max));
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return;
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}
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// update latitudes
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b_lat_min = (std::min)(b_lat_min, p_lat);
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b_lat_max = (std::max)(b_lat_max, p_lat);
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// update longitudes
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if (math::smaller(p_lon, b_lon_min))
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{
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box_coordinate_type p_lon_shifted = p_lon + constants::period();
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if (math::larger(p_lon_shifted, b_lon_max))
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{
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// here we could check using: ! math::larger(.., ..)
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if (math::smaller(b_lon_min - p_lon, p_lon_shifted - b_lon_max))
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{
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b_lon_min = p_lon;
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}
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else
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{
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b_lon_max = p_lon_shifted;
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}
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}
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}
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else if (math::larger(p_lon, b_lon_max))
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{
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// in this case, and since p_lon is normalized in the range
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// (-180, 180], we must have that b_lon_max <= 180
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if (b_lon_min < 0
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&& math::larger(p_lon - b_lon_max,
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constants::period() - p_lon + b_lon_min))
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{
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b_lon_min = p_lon;
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b_lon_max += constants::period();
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}
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else
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{
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b_lon_max = p_lon;
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}
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}
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geometry::set<min_corner, 0>(box, b_lon_min);
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geometry::set<min_corner, 1>(box, b_lat_min);
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geometry::set<max_corner, 0>(box, b_lon_max);
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geometry::set<max_corner, 1>(box, b_lat_max);
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}
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point_loop
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<
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2, DimensionCount
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>::apply(box, point);
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}
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};
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} // namespace detail
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#endif // DOXYGEN_NO_DETAIL
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struct spherical_point
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{
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template <typename Box, typename Point>
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static void apply(Box & box, Point const& point)
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{
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expand::detail::point_loop_on_spheroid
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<
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dimension<Point>::value,
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! std::is_same<typename cs_tag<Point>::type, spherical_polar_tag>::value
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>::apply(box, point);
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}
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};
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#ifndef DOXYGEN_NO_STRATEGY_SPECIALIZATIONS
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namespace services
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{
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template <typename CalculationType>
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struct default_strategy<point_tag, spherical_equatorial_tag, CalculationType>
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{
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typedef spherical_point type;
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};
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template <typename CalculationType>
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struct default_strategy<point_tag, spherical_polar_tag, CalculationType>
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{
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typedef spherical_point type;
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};
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template <typename CalculationType>
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struct default_strategy<point_tag, geographic_tag, CalculationType>
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{
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typedef spherical_point type;
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};
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} // namespace services
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#endif // DOXYGEN_NO_STRATEGY_SPECIALIZATIONS
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}} // namespace strategy::expand
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}} // namespace boost::geometry
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#endif // BOOST_GEOMETRY_STRATEGY_SPHERICAL_EXPAND_POINT_HPP
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