Added boost header

test/external/boost/geometry/algorithms/comparable_distance.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_ALGORITHMS_COMPARABLE_DISTANCE_HPP
+#define BOOST_GEOMETRY_ALGORITHMS_COMPARABLE_DISTANCE_HPP
+
+
+#include <boost/geometry/algorithms/distance.hpp>
+
+
+namespace boost { namespace geometry
+{
+
+
+/*!
+\brief \brief_calc2{comparable distance measurement}
+\ingroup distance
+\details The free function comparable_distance does not necessarily calculate the distance,
+    but it calculates a distance measure such that two distances are comparable to each other.
+    For example: for the Cartesian coordinate system, Pythagoras is used but the square root
+    is not taken, which makes it faster and the results of two point pairs can still be 
+    compared to each other.
+\tparam Geometry1 first geometry type
+\tparam Geometry2 second geometry type
+\param geometry1 \param_geometry
+\param geometry2 \param_geometry
+\return \return_calc{comparable distance}
+
+\qbk{[include reference/algorithms/comparable_distance.qbk]}
+ */
+template <typename Geometry1, typename Geometry2>
+inline typename default_distance_result<Geometry1, Geometry2>::type comparable_distance(
+                Geometry1 const& geometry1, Geometry2 const& geometry2)
+{
+    concept::check<Geometry1 const>();
+    concept::check<Geometry2 const>();
+
+    typedef typename point_type<Geometry1>::type point1_type;
+    typedef typename point_type<Geometry2>::type point2_type;
+
+    // Define a point-point-distance-strategy
+    // for either the normal case, either the reversed case
+
+    typedef typename strategy::distance::services::comparable_type
+        <
+            typename boost::mpl::if_c
+                <
+                    geometry::reverse_dispatch
+                        <Geometry1, Geometry2>::type::value,
+                    typename strategy::distance::services::default_strategy
+                            <point_tag, point2_type, point1_type>::type,
+                    typename strategy::distance::services::default_strategy
+                            <point_tag, point1_type, point2_type>::type
+                >::type
+        >::type strategy_type;
+
+    return distance(geometry1, geometry2, strategy_type());
+}
+
+
+}} // namespace boost::geometry
+
+
+#endif // BOOST_GEOMETRY_ALGORITHMS_COMPARABLE_DISTANCE_HPP