Added boost header

test/external/boost/geometry/geometries/segment.hpp

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+// Boost.Geometry (aka GGL, Generic Geometry Library)
+
+// Copyright (c) 2007-2011 Barend Gehrels, Amsterdam, the Netherlands.
+// Copyright (c) 2008-2011 Bruno Lalande, Paris, France.
+// Copyright (c) 2009-2011 Mateusz Loskot, London, UK.
+
+// Parts of Boost.Geometry are redesigned from Geodan's Geographic Library
+// (geolib/GGL), copyright (c) 1995-2010 Geodan, Amsterdam, the Netherlands.
+
+// Use, modification and distribution is subject to the Boost Software License,
+// Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
+// http://www.boost.org/LICENSE_1_0.txt)
+
+#ifndef BOOST_GEOMETRY_GEOMETRIES_SEGMENT_HPP
+#define BOOST_GEOMETRY_GEOMETRIES_SEGMENT_HPP
+
+#include <cstddef>
+
+#include <boost/concept/assert.hpp>
+#include <boost/mpl/if.hpp>
+#include <boost/type_traits/is_const.hpp>
+
+#include <boost/geometry/geometries/concepts/point_concept.hpp>
+
+namespace boost { namespace geometry
+{
+
+namespace model
+{
+
+/*!
+\brief Class segment: small class containing two points
+\ingroup geometries
+\details From Wikipedia: In geometry, a line segment is a part of a line that is bounded
+ by two distinct end points, and contains every point on the line between its end points.
+\note There is also a point-referring-segment, class referring_segment,
+   containing point references, where points are NOT copied
+*/
+template<typename Point>
+class segment : public std::pair<Point, Point>
+{
+public :
+    inline segment()
+    {}
+
+    inline segment(Point const& p1, Point const& p2)
+    {
+        this->first = p1;
+        this->second = p2;
+    }
+};
+
+
+/*!
+\brief Class segment: small class containing two (templatized) point references
+\ingroup geometries
+\details From Wikipedia: In geometry, a line segment is a part of a line that is bounded
+ by two distinct end points, and contains every point on the line between its end points.
+\note The structure is like std::pair, and can often be used interchangeable.
+Difference is that it refers to points, does not have points.
+\note Like std::pair, points are public available.
+\note type is const or non const, so geometry::segment<P> or geometry::segment<P const>
+\note We cannot derive from std::pair<P&, P&> because of
+reference assignments.
+\tparam ConstOrNonConstPoint point type of the segment, maybe a point or a const point
+*/
+template<typename ConstOrNonConstPoint>
+class referring_segment
+{
+    BOOST_CONCEPT_ASSERT( (
+        typename boost::mpl::if_
+            <
+                boost::is_const<ConstOrNonConstPoint>,
+                concept::Point<ConstOrNonConstPoint>,
+                concept::ConstPoint<ConstOrNonConstPoint>
+            >
+    ) );
+
+    typedef ConstOrNonConstPoint point_type;
+
+public:
+
+    point_type& first;
+    point_type& second;
+
+    inline referring_segment(point_type& p1, point_type& p2)
+        : first(p1)
+        , second(p2)
+    {}
+};
+
+
+} // namespace model
+
+
+// Traits specializations for segment above
+#ifndef DOXYGEN_NO_TRAITS_SPECIALIZATIONS
+namespace traits
+{
+
+template <typename Point>
+struct tag<model::segment<Point> >
+{
+    typedef segment_tag type;
+};
+
+template <typename Point>
+struct point_type<model::segment<Point> >
+{
+    typedef Point type;
+};
+
+template <typename Point, std::size_t Dimension>
+struct indexed_access<model::segment<Point>, 0, Dimension>
+{
+    typedef model::segment<Point> segment_type;
+    typedef typename geometry::coordinate_type<segment_type>::type coordinate_type;
+
+    static inline coordinate_type get(segment_type const& s)
+    {
+        return geometry::get<Dimension>(s.first);
+    }
+
+    static inline void set(segment_type& s, coordinate_type const& value)
+    {
+        geometry::set<Dimension>(s.first, value);
+    }
+};
+
+
+template <typename Point, std::size_t Dimension>
+struct indexed_access<model::segment<Point>, 1, Dimension>
+{
+    typedef model::segment<Point> segment_type;
+    typedef typename geometry::coordinate_type<segment_type>::type coordinate_type;
+
+    static inline coordinate_type get(segment_type const& s)
+    {
+        return geometry::get<Dimension>(s.second);
+    }
+
+    static inline void set(segment_type& s, coordinate_type const& value)
+    {
+        geometry::set<Dimension>(s.second, value);
+    }
+};
+
+
+template <typename ConstOrNonConstPoint>
+struct tag<model::referring_segment<ConstOrNonConstPoint> >
+{
+    typedef segment_tag type;
+};
+
+template <typename ConstOrNonConstPoint>
+struct point_type<model::referring_segment<ConstOrNonConstPoint> >
+{
+    typedef ConstOrNonConstPoint type;
+};
+
+template <typename ConstOrNonConstPoint, std::size_t Dimension>
+struct indexed_access<model::referring_segment<ConstOrNonConstPoint>, 0, Dimension>
+{
+    typedef model::referring_segment<ConstOrNonConstPoint> segment_type;
+    typedef typename geometry::coordinate_type<segment_type>::type coordinate_type;
+
+    static inline coordinate_type get(segment_type const& s)
+    {
+        return geometry::get<Dimension>(s.first);
+    }
+
+    static inline void set(segment_type& s, coordinate_type const& value)
+    {
+        geometry::set<Dimension>(s.first, value);
+    }
+};
+
+
+template <typename ConstOrNonConstPoint, std::size_t Dimension>
+struct indexed_access<model::referring_segment<ConstOrNonConstPoint>, 1, Dimension>
+{
+    typedef model::referring_segment<ConstOrNonConstPoint> segment_type;
+    typedef typename geometry::coordinate_type<segment_type>::type coordinate_type;
+
+    static inline coordinate_type get(segment_type const& s)
+    {
+        return geometry::get<Dimension>(s.second);
+    }
+
+    static inline void set(segment_type& s, coordinate_type const& value)
+    {
+        geometry::set<Dimension>(s.second, value);
+    }
+};
+
+
+
+} // namespace traits
+#endif // DOXYGEN_NO_TRAITS_SPECIALIZATIONS
+
+}} // namespace boost::geometry
+
+#endif // BOOST_GEOMETRY_GEOMETRIES_SEGMENT_HPP