Added thirdparty: boost library

thirdparty/include/boost/geometry/strategies/cartesian/distance_pythagoras.hpp

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+// Boost.Geometry (aka GGL, Generic Geometry Library)
+
+// Copyright (c) 2008-2012 Bruno Lalande, Paris, France.
+// Copyright (c) 2008-2012 Barend Gehrels, Amsterdam, the Netherlands.
+// Copyright (c) 2009-2012 Mateusz Loskot, London, UK.
+
+// This file was modified by Oracle on 2018.
+// Modifications copyright (c) 2018, Oracle and/or its affiliates.
+
+// Contributed and/or modified by Adam Wulkiewicz, on behalf of Oracle
+
+// 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_STRATEGIES_CARTESIAN_DISTANCE_PYTHAGORAS_HPP
+#define BOOST_GEOMETRY_STRATEGIES_CARTESIAN_DISTANCE_PYTHAGORAS_HPP
+
+
+#include <boost/geometry/core/access.hpp>
+
+#include <boost/geometry/geometries/concepts/point_concept.hpp>
+
+#include <boost/geometry/strategies/distance.hpp>
+
+#include <boost/geometry/util/math.hpp>
+#include <boost/geometry/util/calculation_type.hpp>
+
+
+namespace boost { namespace geometry
+{
+
+namespace strategy { namespace distance
+{
+
+#ifndef DOXYGEN_NO_DETAIL
+namespace detail
+{
+
+template <size_t I, typename T>
+struct compute_pythagoras
+{
+    template <typename Point1, typename Point2>
+    static inline T apply(Point1 const& p1, Point2 const& p2)
+    {
+        T const c1 = boost::numeric_cast<T>(get<I-1>(p1));
+        T const c2 = boost::numeric_cast<T>(get<I-1>(p2));
+        T const d = c1 - c2;
+        return d * d + compute_pythagoras<I-1, T>::apply(p1, p2);
+    }
+};
+
+template <typename T>
+struct compute_pythagoras<0, T>
+{
+    template <typename Point1, typename Point2>
+    static inline T apply(Point1 const&, Point2 const&)
+    {
+        return boost::numeric_cast<T>(0);
+    }
+};
+
+}
+#endif // DOXYGEN_NO_DETAIL
+
+
+namespace comparable
+{
+
+/*!
+\brief Strategy to calculate comparable distance between two points
+\ingroup strategies
+\tparam Point1 \tparam_first_point
+\tparam Point2 \tparam_second_point
+\tparam CalculationType \tparam_calculation
+*/
+template <typename CalculationType = void>
+class pythagoras
+{
+public :
+
+    template <typename Point1, typename Point2>
+    struct calculation_type
+        : util::calculation_type::geometric::binary
+          <
+              Point1,
+              Point2,
+              CalculationType,
+              double,
+              double
+          >
+    {};
+
+    template <typename Point1, typename Point2>
+    static inline typename calculation_type<Point1, Point2>::type
+    apply(Point1 const& p1, Point2 const& p2)
+    {
+        BOOST_CONCEPT_ASSERT( (concepts::ConstPoint<Point1>) );
+        BOOST_CONCEPT_ASSERT( (concepts::ConstPoint<Point2>) );
+
+        // Calculate distance using Pythagoras
+        // (Leave comment above for Doxygen)
+
+        assert_dimension_equal<Point1, Point2>();
+
+        return detail::compute_pythagoras
+            <
+                dimension<Point1>::value,
+                typename calculation_type<Point1, Point2>::type
+            >::apply(p1, p2);
+    }
+};
+
+} // namespace comparable
+
+
+/*!
+\brief Strategy to calculate the distance between two points
+\ingroup strategies
+\tparam CalculationType \tparam_calculation
+
+\qbk{
+[heading Notes]
+[note Can be used for points with two\, three or more dimensions]
+[heading See also]
+[link geometry.reference.algorithms.distance.distance_3_with_strategy distance (with strategy)]
+}
+
+*/
+template
+<
+    typename CalculationType = void
+>
+class pythagoras
+{
+public :
+
+    template <typename P1, typename P2>
+    struct calculation_type
+        : util::calculation_type::geometric::binary
+          <
+              P1,
+              P2,
+              CalculationType,
+              double,
+              double // promote integer to double
+          >
+    {};
+
+    /*!
+    \brief applies the distance calculation using pythagoras
+    \return the calculated distance (including taking the square root)
+    \param p1 first point
+    \param p2 second point
+    */
+    template <typename P1, typename P2>
+    static inline typename calculation_type<P1, P2>::type
+    apply(P1 const& p1, P2 const& p2)
+    {
+        // The cast is necessary for MSVC which considers sqrt __int64 as an ambiguous call
+        return math::sqrt
+            (
+                 boost::numeric_cast<typename calculation_type<P1, P2>::type>
+                    (
+                        comparable::pythagoras<CalculationType>::apply(p1, p2)
+                    )
+            );
+    }
+};
+
+
+#ifndef DOXYGEN_NO_STRATEGY_SPECIALIZATIONS
+namespace services
+{
+
+template <typename CalculationType>
+struct tag<pythagoras<CalculationType> >
+{
+    typedef strategy_tag_distance_point_point type;
+};
+
+
+template <typename CalculationType, typename P1, typename P2>
+struct return_type<distance::pythagoras<CalculationType>, P1, P2>
+    : pythagoras<CalculationType>::template calculation_type<P1, P2>
+{};
+
+
+template <typename CalculationType>
+struct comparable_type<pythagoras<CalculationType> >
+{
+    typedef comparable::pythagoras<CalculationType> type;
+};
+
+
+template <typename CalculationType>
+struct get_comparable<pythagoras<CalculationType> >
+{
+    typedef comparable::pythagoras<CalculationType> comparable_type;
+public :
+    static inline comparable_type apply(pythagoras<CalculationType> const& )
+    {
+        return comparable_type();
+    }
+};
+
+
+template <typename CalculationType, typename Point1, typename Point2>
+struct result_from_distance<pythagoras<CalculationType>, Point1, Point2>
+{
+private :
+    typedef typename return_type<pythagoras<CalculationType>, Point1, Point2>::type return_type;
+public :
+    template <typename T>
+    static inline return_type apply(pythagoras<CalculationType> const& , T const& value)
+    {
+        return return_type(value);
+    }
+};
+
+
+// Specializations for comparable::pythagoras
+template <typename CalculationType>
+struct tag<comparable::pythagoras<CalculationType> >
+{
+    typedef strategy_tag_distance_point_point type;
+};
+
+
+template <typename CalculationType, typename P1, typename P2>
+struct return_type<comparable::pythagoras<CalculationType>, P1, P2>
+    : comparable::pythagoras<CalculationType>::template calculation_type<P1, P2>
+{};
+
+
+
+
+template <typename CalculationType>
+struct comparable_type<comparable::pythagoras<CalculationType> >
+{
+    typedef comparable::pythagoras<CalculationType> type;
+};
+
+
+template <typename CalculationType>
+struct get_comparable<comparable::pythagoras<CalculationType> >
+{
+    typedef comparable::pythagoras<CalculationType> comparable_type;
+public :
+    static inline comparable_type apply(comparable::pythagoras<CalculationType> const& )
+    {
+        return comparable_type();
+    }
+};
+
+
+template <typename CalculationType, typename Point1, typename Point2>
+struct result_from_distance<comparable::pythagoras<CalculationType>, Point1, Point2>
+{
+private :
+    typedef typename return_type<comparable::pythagoras<CalculationType>, Point1, Point2>::type return_type;
+public :
+    template <typename T>
+    static inline return_type apply(comparable::pythagoras<CalculationType> const& , T const& value)
+    {
+        return_type const v = value;
+        return v * v;
+    }
+};
+
+
+template <typename Point1, typename Point2>
+struct default_strategy
+    <
+        point_tag, point_tag, Point1, Point2, cartesian_tag, cartesian_tag
+    >
+{
+    typedef pythagoras<> type;
+};
+
+
+} // namespace services
+#endif // DOXYGEN_NO_STRATEGY_SPECIALIZATIONS
+
+
+}} // namespace strategy::distance
+
+
+}} // namespace boost::geometry
+
+
+#endif // BOOST_GEOMETRY_STRATEGIES_CARTESIAN_DISTANCE_PYTHAGORAS_HPP