143 lines
3.7 KiB
C++
143 lines
3.7 KiB
C++
// Boost.Geometry (aka GGL, Generic Geometry Library)
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// Copyright (c) 2014, Oracle and/or its affiliates.
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// Contributed and/or modified by Menelaos Karavelas, 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_GEOMETRIES_POINTING_SEGMENT_HPP
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#define BOOST_GEOMETRY_GEOMETRIES_POINTING_SEGMENT_HPP
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#include <cstddef>
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#include <boost/concept/assert.hpp>
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#include <boost/core/addressof.hpp>
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#include <boost/mpl/if.hpp>
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#include <boost/type_traits/is_const.hpp>
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#include <boost/geometry/core/access.hpp>
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#include <boost/geometry/core/assert.hpp>
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#include <boost/geometry/core/coordinate_type.hpp>
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#include <boost/geometry/geometries/concepts/point_concept.hpp>
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namespace boost { namespace geometry
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{
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namespace model
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{
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// const or non-const segment type that is meant to be
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// * default constructible
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// * copy constructible
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// * assignable
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// referring_segment does not fit these requirements, hence the
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// pointing_segment class
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//
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// this class is used by the segment_iterator as its value type
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template <typename ConstOrNonConstPoint>
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class pointing_segment
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{
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BOOST_CONCEPT_ASSERT( (
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typename boost::mpl::if_
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<
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boost::is_const<ConstOrNonConstPoint>,
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concepts::Point<ConstOrNonConstPoint>,
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concepts::ConstPoint<ConstOrNonConstPoint>
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>
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) );
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typedef ConstOrNonConstPoint point_type;
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public:
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point_type* first;
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point_type* second;
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inline pointing_segment()
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: first(NULL)
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, second(NULL)
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{}
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inline pointing_segment(point_type const& p1, point_type const& p2)
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: first(boost::addressof(p1))
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, second(boost::addressof(p2))
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{}
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};
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} // namespace model
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// Traits specializations for segment above
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#ifndef DOXYGEN_NO_TRAITS_SPECIALIZATIONS
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namespace traits
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{
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template <typename Point>
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struct tag<model::pointing_segment<Point> >
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{
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typedef segment_tag type;
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};
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template <typename Point>
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struct point_type<model::pointing_segment<Point> >
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{
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typedef Point type;
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};
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template <typename Point, std::size_t Dimension>
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struct indexed_access<model::pointing_segment<Point>, 0, Dimension>
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{
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typedef model::pointing_segment<Point> segment_type;
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typedef typename geometry::coordinate_type
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<
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segment_type
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>::type coordinate_type;
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static inline coordinate_type get(segment_type const& s)
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{
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BOOST_GEOMETRY_ASSERT( s.first != NULL );
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return geometry::get<Dimension>(*s.first);
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}
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static inline void set(segment_type& s, coordinate_type const& value)
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{
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BOOST_GEOMETRY_ASSERT( s.first != NULL );
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geometry::set<Dimension>(*s.first, value);
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}
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};
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template <typename Point, std::size_t Dimension>
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struct indexed_access<model::pointing_segment<Point>, 1, Dimension>
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{
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typedef model::pointing_segment<Point> segment_type;
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typedef typename geometry::coordinate_type
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<
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segment_type
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>::type coordinate_type;
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static inline coordinate_type get(segment_type const& s)
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{
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BOOST_GEOMETRY_ASSERT( s.second != NULL );
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return geometry::get<Dimension>(*s.second);
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}
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static inline void set(segment_type& s, coordinate_type const& value)
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{
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BOOST_GEOMETRY_ASSERT( s.second != NULL );
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geometry::set<Dimension>(*s.second, value);
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}
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};
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} // namespace traits
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#endif // DOXYGEN_NO_TRAITS_SPECIALIZATIONS
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}} // namespace boost::geometry
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#endif // BOOST_GEOMETRY_GEOMETRIES_POINTING_SEGMENT_HPP
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