Added thirdparty: boost library

thirdparty/include/boost/geometry/strategies/agnostic/simplify_douglas_peucker.hpp

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+// Boost.Geometry (aka GGL, Generic Geometry Library)
+
+// Copyright (c) 1995, 2007-2015 Barend Gehrels, Amsterdam, the Netherlands.
+// Copyright (c) 1995 Maarten Hilferink, Amsterdam, the Netherlands
+
+// This file was modified by Oracle on 2015-2021.
+// Modifications copyright (c) 2015-2021, Oracle and/or its affiliates.
+// Contributed and/or modified by Menelaos Karavelas, on behalf of Oracle
+// 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_STRATEGY_AGNOSTIC_SIMPLIFY_DOUGLAS_PEUCKER_HPP
+#define BOOST_GEOMETRY_STRATEGY_AGNOSTIC_SIMPLIFY_DOUGLAS_PEUCKER_HPP
+
+
+#include <boost/geometry/strategies/distance.hpp>
+
+
+namespace boost { namespace geometry
+{
+
+namespace strategy { namespace simplify
+{
+
+
+// NOTE: Left here for backward compatibility.
+
+
+/*!
+\brief Implements the simplify algorithm.
+\ingroup strategies
+\details The douglas_peucker strategy simplifies a linestring, ring or
+    vector of points using the well-known Douglas-Peucker algorithm.
+\tparam Point the point type
+\tparam PointDistanceStrategy point-segment distance strategy to be used
+\note This strategy uses itself a point-segment-distance strategy which
+    can be specified
+\author Barend and Maarten, 1995/1996
+\author Barend, revised for Generic Geometry Library, 2008
+*/
+
+/*
+For the algorithm, see for example:
+ - http://en.wikipedia.org/wiki/Ramer-Douglas-Peucker_algorithm
+ - http://www2.dcs.hull.ac.uk/CISRG/projects/Royal-Inst/demos/dp.html
+*/
+template
+<
+    typename Point,
+    typename PointDistanceStrategy
+>
+class douglas_peucker
+{
+public :
+
+    typedef PointDistanceStrategy distance_strategy_type;
+
+    typedef typename strategy::distance::services::return_type
+                     <
+                         distance_strategy_type,
+                         Point, Point
+                     >::type distance_type;
+
+    template <typename Range, typename OutputIterator>
+    static inline OutputIterator apply(Range const& ,
+                                       OutputIterator out,
+                                       distance_type const& )
+    {
+        return out;
+    }
+};
+
+}} // namespace strategy::simplify
+
+
+}} // namespace boost::geometry
+
+#endif // BOOST_GEOMETRY_STRATEGY_AGNOSTIC_SIMPLIFY_DOUGLAS_PEUCKER_HPP