272 lines
6.5 KiB
C++
272 lines
6.5 KiB
C++
// Boost.Geometry (aka GGL, Generic Geometry Library)
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// Copyright (c) 2007-2012 Barend Gehrels, Amsterdam, the Netherlands.
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// Copyright (c) 2008-2012 Bruno Lalande, Paris, France.
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// Copyright (c) 2009-2012 Mateusz Loskot, London, UK.
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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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// Use, modification and distribution is subject to the Boost Software License,
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// Version 1.0. (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_ALGORITHMS_FOR_EACH_HPP
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#define BOOST_GEOMETRY_ALGORITHMS_FOR_EACH_HPP
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#include <algorithm>
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#include <boost/range.hpp>
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#include <boost/type_traits/is_const.hpp>
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#include <boost/typeof/typeof.hpp>
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#include <boost/geometry/algorithms/not_implemented.hpp>
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#include <boost/geometry/core/exterior_ring.hpp>
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#include <boost/geometry/core/interior_rings.hpp>
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#include <boost/geometry/core/tag_cast.hpp>
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#include <boost/geometry/geometries/concepts/check.hpp>
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#include <boost/geometry/geometries/segment.hpp>
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#include <boost/geometry/util/add_const_if_c.hpp>
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namespace boost { namespace geometry
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{
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#ifndef DOXYGEN_NO_DETAIL
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namespace detail { namespace for_each
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{
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struct fe_point_per_point
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{
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template <typename Point, typename Functor>
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static inline void apply(Point& point, Functor& f)
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{
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f(point);
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}
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};
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struct fe_point_per_segment
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{
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template <typename Point, typename Functor>
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static inline void apply(Point& , Functor& f)
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{
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// TODO: if non-const, we should extract the points from the segment
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// and call the functor on those two points
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}
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};
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struct fe_range_per_point
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{
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template <typename Range, typename Functor>
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static inline void apply(Range& range, Functor& f)
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{
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// The previous implementation called the std library:
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// return (std::for_each(boost::begin(range), boost::end(range), f));
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// But that is not accepted for capturing lambda's.
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// It needs to do it like that to return the state of Functor f (f is passed by value in std::for_each).
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// So we now loop manually.
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for (typename boost::range_iterator<Range>::type it = boost::begin(range); it != boost::end(range); ++it)
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{
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f(*it);
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}
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}
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};
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struct fe_range_per_segment
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{
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template <typename Range, typename Functor>
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static inline void apply(Range& range, Functor& f)
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{
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typedef typename add_const_if_c
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<
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is_const<Range>::value,
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typename point_type<Range>::type
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>::type point_type;
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BOOST_AUTO_TPL(it, boost::begin(range));
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BOOST_AUTO_TPL(previous, it++);
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while(it != boost::end(range))
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{
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model::referring_segment<point_type> s(*previous, *it);
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f(s);
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previous = it++;
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}
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}
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};
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struct fe_polygon_per_point
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{
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template <typename Polygon, typename Functor>
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static inline void apply(Polygon& poly, Functor& f)
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{
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fe_range_per_point::apply(exterior_ring(poly), f);
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typename interior_return_type<Polygon>::type rings
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= interior_rings(poly);
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for (BOOST_AUTO_TPL(it, boost::begin(rings)); it != boost::end(rings); ++it)
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{
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fe_range_per_point::apply(*it, f);
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}
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}
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};
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struct fe_polygon_per_segment
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{
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template <typename Polygon, typename Functor>
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static inline void apply(Polygon& poly, Functor& f)
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{
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fe_range_per_segment::apply(exterior_ring(poly), f);
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typename interior_return_type<Polygon>::type rings
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= interior_rings(poly);
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for (BOOST_AUTO_TPL(it, boost::begin(rings)); it != boost::end(rings); ++it)
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{
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fe_range_per_segment::apply(*it, f);
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}
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}
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};
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}} // namespace detail::for_each
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#endif // DOXYGEN_NO_DETAIL
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#ifndef DOXYGEN_NO_DISPATCH
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namespace dispatch
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{
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template
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<
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typename Geometry,
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typename Tag = typename tag_cast<typename tag<Geometry>::type, multi_tag>::type
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>
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struct for_each_point: not_implemented<Tag>
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{};
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template <typename Point>
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struct for_each_point<Point, point_tag>
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: detail::for_each::fe_point_per_point
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{};
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template <typename Linestring>
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struct for_each_point<Linestring, linestring_tag>
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: detail::for_each::fe_range_per_point
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{};
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template <typename Ring>
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struct for_each_point<Ring, ring_tag>
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: detail::for_each::fe_range_per_point
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{};
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template <typename Polygon>
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struct for_each_point<Polygon, polygon_tag>
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: detail::for_each::fe_polygon_per_point
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{};
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template
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<
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typename Geometry,
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typename Tag = typename tag_cast<typename tag<Geometry>::type, multi_tag>::type
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>
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struct for_each_segment: not_implemented<Tag>
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{};
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template <typename Point>
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struct for_each_segment<Point, point_tag>
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: detail::for_each::fe_point_per_segment
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{};
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template <typename Linestring>
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struct for_each_segment<Linestring, linestring_tag>
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: detail::for_each::fe_range_per_segment
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{};
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template <typename Ring>
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struct for_each_segment<Ring, ring_tag>
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: detail::for_each::fe_range_per_segment
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{};
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template <typename Polygon>
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struct for_each_segment<Polygon, polygon_tag>
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: detail::for_each::fe_polygon_per_segment
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{};
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} // namespace dispatch
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#endif // DOXYGEN_NO_DISPATCH
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/*!
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\brief \brf_for_each{point}
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\details \det_for_each{point}
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\ingroup for_each
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\param geometry \param_geometry
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\param f \par_for_each_f{point}
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\tparam Geometry \tparam_geometry
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\tparam Functor \tparam_functor
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\qbk{[include reference/algorithms/for_each_point.qbk]}
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\qbk{[heading Example]}
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\qbk{[for_each_point] [for_each_point_output]}
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\qbk{[for_each_point_const] [for_each_point_const_output]}
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*/
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template<typename Geometry, typename Functor>
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inline Functor for_each_point(Geometry& geometry, Functor f)
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{
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concept::check<Geometry>();
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dispatch::for_each_point<Geometry>::apply(geometry, f);
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return f;
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}
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/*!
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\brief \brf_for_each{segment}
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\details \det_for_each{segment}
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\ingroup for_each
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\param geometry \param_geometry
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\param f \par_for_each_f{segment}
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\tparam Geometry \tparam_geometry
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\tparam Functor \tparam_functor
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\qbk{[include reference/algorithms/for_each_segment.qbk]}
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\qbk{[heading Example]}
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\qbk{[for_each_segment_const] [for_each_segment_const_output]}
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*/
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template<typename Geometry, typename Functor>
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inline Functor for_each_segment(Geometry& geometry, Functor f)
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{
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concept::check<Geometry>();
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dispatch::for_each_segment<Geometry>::apply(geometry, f);
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return f;
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}
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}} // namespace boost::geometry
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#endif // BOOST_GEOMETRY_ALGORITHMS_FOR_EACH_HPP
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