Chris@102: // Boost.Geometry (aka GGL, Generic Geometry Library)
Chris@102: 
Chris@102: // Copyright (c) 2014, Oracle and/or its affiliates.
Chris@102: 
Chris@102: // Contributed and/or modified by Menelaos Karavelas, on behalf of Oracle
Chris@102: 
Chris@102: // Licensed under the Boost Software License version 1.0.
Chris@102: // http://www.boost.org/users/license.html
Chris@102: 
Chris@102: #ifndef BOOST_GEOMETRY_GEOMETRIES_POINTING_SEGMENT_HPP
Chris@102: #define BOOST_GEOMETRY_GEOMETRIES_POINTING_SEGMENT_HPP
Chris@102: 
Chris@102: #include <cstddef>
Chris@102: 
Chris@102: #include <boost/assert.hpp>
Chris@102: #include <boost/concept/assert.hpp>
Chris@102: #include <boost/core/addressof.hpp>
Chris@102: #include <boost/mpl/if.hpp>
Chris@102: #include <boost/type_traits/is_const.hpp>
Chris@102: 
Chris@102: #include <boost/geometry/geometries/concepts/point_concept.hpp>
Chris@102: 
Chris@102: #include <boost/geometry/core/access.hpp>
Chris@102: #include <boost/geometry/core/coordinate_type.hpp>
Chris@102: 
Chris@102: 
Chris@102: namespace boost { namespace geometry
Chris@102: {
Chris@102: 
Chris@102: namespace model
Chris@102: {
Chris@102: 
Chris@102: // const or non-const segment type that is meant to be
Chris@102: // * default constructible
Chris@102: // * copy constructible
Chris@102: // * assignable
Chris@102: // referring_segment does not fit these requirements, hence the
Chris@102: // pointing_segment class
Chris@102: //
Chris@102: // this class is used by the segment_iterator as its value type
Chris@102: template <typename ConstOrNonConstPoint>
Chris@102: class pointing_segment
Chris@102: {
Chris@102:     BOOST_CONCEPT_ASSERT( (
Chris@102:         typename boost::mpl::if_
Chris@102:             <
Chris@102:                 boost::is_const<ConstOrNonConstPoint>,
Chris@102:                 concept::Point<ConstOrNonConstPoint>,
Chris@102:                 concept::ConstPoint<ConstOrNonConstPoint>
Chris@102:             >
Chris@102:     ) );
Chris@102: 
Chris@102:     typedef ConstOrNonConstPoint point_type;
Chris@102: 
Chris@102: public:
Chris@102:     point_type* first;
Chris@102:     point_type* second;
Chris@102: 
Chris@102:     inline pointing_segment()
Chris@102:         : first(NULL)
Chris@102:         , second(NULL)
Chris@102:     {}
Chris@102: 
Chris@102:     inline pointing_segment(point_type const& p1, point_type const& p2)
Chris@102:         : first(boost::addressof(p1))
Chris@102:         , second(boost::addressof(p2))
Chris@102:     {}
Chris@102: };
Chris@102: 
Chris@102: 
Chris@102: } // namespace model
Chris@102: 
Chris@102: 
Chris@102: // Traits specializations for segment above
Chris@102: #ifndef DOXYGEN_NO_TRAITS_SPECIALIZATIONS
Chris@102: namespace traits
Chris@102: {
Chris@102: 
Chris@102: template <typename Point>
Chris@102: struct tag<model::pointing_segment<Point> >
Chris@102: {
Chris@102:     typedef segment_tag type;
Chris@102: };
Chris@102: 
Chris@102: template <typename Point>
Chris@102: struct point_type<model::pointing_segment<Point> >
Chris@102: {
Chris@102:     typedef Point type;
Chris@102: };
Chris@102: 
Chris@102: template <typename Point, std::size_t Dimension>
Chris@102: struct indexed_access<model::pointing_segment<Point>, 0, Dimension>
Chris@102: {
Chris@102:     typedef model::pointing_segment<Point> segment_type;
Chris@102:     typedef typename geometry::coordinate_type
Chris@102:         <
Chris@102:             segment_type
Chris@102:         >::type coordinate_type;
Chris@102: 
Chris@102:     static inline coordinate_type get(segment_type const& s)
Chris@102:     {
Chris@102:         BOOST_ASSERT( s.first != NULL );
Chris@102:         return geometry::get<Dimension>(*s.first);
Chris@102:     }
Chris@102: 
Chris@102:     static inline void set(segment_type& s, coordinate_type const& value)
Chris@102:     {
Chris@102:         BOOST_ASSERT( s.first != NULL );
Chris@102:         geometry::set<Dimension>(*s.first, value);
Chris@102:     }
Chris@102: };
Chris@102: 
Chris@102: 
Chris@102: template <typename Point, std::size_t Dimension>
Chris@102: struct indexed_access<model::pointing_segment<Point>, 1, Dimension>
Chris@102: {
Chris@102:     typedef model::pointing_segment<Point> segment_type;
Chris@102:     typedef typename geometry::coordinate_type
Chris@102:         <
Chris@102:             segment_type
Chris@102:         >::type coordinate_type;
Chris@102: 
Chris@102:     static inline coordinate_type get(segment_type const& s)
Chris@102:     {
Chris@102:         BOOST_ASSERT( s.second != NULL );
Chris@102:         return geometry::get<Dimension>(*s.second);
Chris@102:     }
Chris@102: 
Chris@102:     static inline void set(segment_type& s, coordinate_type const& value)
Chris@102:     {
Chris@102:         BOOST_ASSERT( s.second != NULL );
Chris@102:         geometry::set<Dimension>(*s.second, value);
Chris@102:     }
Chris@102: };
Chris@102: 
Chris@102: 
Chris@102: 
Chris@102: } // namespace traits
Chris@102: #endif // DOXYGEN_NO_TRAITS_SPECIALIZATIONS
Chris@102: 
Chris@102: }} // namespace boost::geometry
Chris@102: 
Chris@102: #endif // BOOST_GEOMETRY_GEOMETRIES_POINTING_SEGMENT_HPP