Added boost header

test/external/boost/geometry/geometries/concepts/segment_concept.hpp

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+// Boost.Geometry (aka GGL, Generic Geometry Library)
+
+// Copyright (c) 2008-2011 Bruno Lalande, Paris, France.
+// Copyright (c) 2008-2011 Barend Gehrels, Amsterdam, the Netherlands.
+// 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_CONCEPTS_SEGMENT_CONCEPT_HPP
+#define BOOST_GEOMETRY_GEOMETRIES_CONCEPTS_SEGMENT_CONCEPT_HPP
+
+
+#include <boost/concept_check.hpp>
+
+#include <boost/geometry/geometries/concepts/point_concept.hpp>
+
+#include <boost/geometry/core/access.hpp>
+#include <boost/geometry/core/point_type.hpp>
+
+
+namespace boost { namespace geometry { namespace concept
+{
+
+
+/*!
+\brief Segment concept.
+\ingroup concepts
+\details Formal definition:
+The segment concept is defined as following:
+- there must be a specialization of traits::tag defining segment_tag as type
+- there must be a specialization of traits::point_type to define the
+  underlying point type (even if it does not consist of points, it should define
+  this type, to indicate the points it can work with)
+- there must be a specialization of traits::indexed_access, per index
+  and per dimension, with two functions:
+  - get to get a coordinate value
+  - set to set a coordinate value (this one is not checked for ConstSegment)
+
+\note The segment concept is similar to the box concept, defining another tag.
+However, the box concept assumes the index as min_corner, max_corner, while
+for the segment concept there is no assumption.
+*/
+template <typename Geometry>
+class Segment
+{
+#ifndef DOXYGEN_NO_CONCEPT_MEMBERS
+    typedef typename point_type<Geometry>::type point_type;
+
+    BOOST_CONCEPT_ASSERT( (concept::Point<point_type>) );
+
+
+    template <size_t Index, size_t Dimension, size_t DimensionCount>
+    struct dimension_checker
+    {
+        static void apply()
+        {
+            Geometry* s = 0;
+            geometry::set<Index, Dimension>(*s, geometry::get<Index, Dimension>(*s));
+            dimension_checker<Index, Dimension + 1, DimensionCount>::apply();
+        }
+    };
+
+    template <size_t Index, size_t DimensionCount>
+    struct dimension_checker<Index, DimensionCount, DimensionCount>
+    {
+        static void apply() {}
+    };
+
+public :
+
+    BOOST_CONCEPT_USAGE(Segment)
+    {
+        static const size_t n = dimension<point_type>::type::value;
+        dimension_checker<0, 0, n>::apply();
+        dimension_checker<1, 0, n>::apply();
+    }
+#endif
+};
+
+
+/*!
+\brief Segment concept (const version).
+\ingroup const_concepts
+\details The ConstSegment concept verifies the same as the Segment concept,
+but does not verify write access.
+*/
+template <typename Geometry>
+class ConstSegment
+{
+#ifndef DOXYGEN_NO_CONCEPT_MEMBERS
+    typedef typename point_type<Geometry>::type point_type;
+    typedef typename coordinate_type<Geometry>::type coordinate_type;
+
+    BOOST_CONCEPT_ASSERT( (concept::ConstPoint<point_type>) );
+
+
+    template <size_t Index, size_t Dimension, size_t DimensionCount>
+    struct dimension_checker
+    {
+        static void apply()
+        {
+            const Geometry* s = 0;
+            coordinate_type coord(geometry::get<Index, Dimension>(*s));
+            boost::ignore_unused_variable_warning(coord);
+            dimension_checker<Index, Dimension + 1, DimensionCount>::apply();
+        }
+    };
+
+    template <size_t Index, size_t DimensionCount>
+    struct dimension_checker<Index, DimensionCount, DimensionCount>
+    {
+        static void apply() {}
+    };
+
+public :
+
+    BOOST_CONCEPT_USAGE(ConstSegment)
+    {
+        static const size_t n = dimension<point_type>::type::value;
+        dimension_checker<0, 0, n>::apply();
+        dimension_checker<1, 0, n>::apply();
+    }
+#endif
+};
+
+
+}}} // namespace boost::geometry::concept
+
+
+#endif // BOOST_GEOMETRY_GEOMETRIES_CONCEPTS_SEGMENT_CONCEPT_HPP