Added boost header

test/external/boost/geometry/geometries/concepts/ring_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_RING_CONCEPT_HPP
+#define BOOST_GEOMETRY_GEOMETRIES_CONCEPTS_RING_CONCEPT_HPP
+
+
+#include <boost/concept_check.hpp>
+#include <boost/range/concepts.hpp>
+#include <boost/type_traits/remove_const.hpp>
+
+#include <boost/geometry/core/access.hpp>
+#include <boost/geometry/core/mutable_range.hpp>
+#include <boost/geometry/core/point_type.hpp>
+
+#include <boost/geometry/geometries/concepts/point_concept.hpp>
+
+
+namespace boost { namespace geometry { namespace concept
+{
+
+
+/*!
+\brief ring concept
+\ingroup concepts
+\par Formal definition:
+The ring concept is defined as following:
+- there must be a specialization of traits::tag defining ring_tag as type
+- it must behave like a Boost.Range
+- there can optionally be a specialization of traits::point_order defining the
+  order or orientation of its points, clockwise or counterclockwise.
+- it must implement a std::back_insert_iterator
+  (This is the same as the for the concept Linestring, and described there)
+
+\note to fulfill the concepts, no traits class has to be specialized to
+define the point type.
+*/
+template <typename Geometry>
+class Ring
+{
+#ifndef DOXYGEN_NO_CONCEPT_MEMBERS
+    typedef typename point_type<Geometry>::type point_type;
+
+    BOOST_CONCEPT_ASSERT( (concept::Point<point_type>) );
+    BOOST_CONCEPT_ASSERT( (boost::RandomAccessRangeConcept<Geometry>) );
+
+public :
+
+    BOOST_CONCEPT_USAGE(Ring)
+    {
+        Geometry* ring = 0;
+        traits::clear<Geometry>::apply(*ring);
+        traits::resize<Geometry>::apply(*ring, 0);
+        point_type* point = 0;
+        traits::push_back<Geometry>::apply(*ring, *point);
+    }
+#endif
+};
+
+
+/*!
+\brief (linear) ring concept (const version)
+\ingroup const_concepts
+\details The ConstLinearRing concept check the same as the Geometry concept,
+but does not check write access.
+*/
+template <typename Geometry>
+class ConstRing
+{
+#ifndef DOXYGEN_NO_CONCEPT_MEMBERS
+    typedef typename point_type<Geometry>::type point_type;
+
+    BOOST_CONCEPT_ASSERT( (concept::ConstPoint<point_type>) );
+    BOOST_CONCEPT_ASSERT( (boost::RandomAccessRangeConcept<Geometry>) );
+
+
+public :
+
+    BOOST_CONCEPT_USAGE(ConstRing)
+    {
+    }
+#endif
+};
+
+}}} // namespace boost::geometry::concept
+
+
+#endif // BOOST_GEOMETRY_GEOMETRIES_CONCEPTS_RING_CONCEPT_HPP