Added thirdparty: boost library

thirdparty/include/boost/geometry/algorithms/is_empty.hpp

@@ -0,0 +1,215 @@
+// Boost.Geometry (aka GGL, Generic Geometry Library)
+
+// Copyright (c) 2015-2023, Oracle and/or its affiliates.
+
+// Contributed and/or modified by Vissarion Fysikopoulos, on behalf of Oracle
+// Contributed and/or modified by Menelaos Karavelas, on behalf of Oracle
+// Contributed and/or modified by Adam Wulkiewicz, on behalf of Oracle
+
+// Licensed under the Boost Software License version 1.0.
+// http://www.boost.org/users/license.html
+
+#ifndef BOOST_GEOMETRY_ALGORITHMS_IS_EMPTY_HPP
+#define BOOST_GEOMETRY_ALGORITHMS_IS_EMPTY_HPP
+
+#include <boost/range/begin.hpp>
+#include <boost/range/empty.hpp>
+#include <boost/range/end.hpp>
+
+#include <boost/geometry/algorithms/not_implemented.hpp>
+#include <boost/geometry/algorithms/detail/visit.hpp>
+
+#include <boost/geometry/core/exterior_ring.hpp>
+#include <boost/geometry/core/interior_rings.hpp>
+#include <boost/geometry/core/tag.hpp>
+#include <boost/geometry/core/tags.hpp>
+#include <boost/geometry/core/visit.hpp>
+
+#include <boost/geometry/geometries/adapted/boost_variant.hpp> // For backward compatibility
+#include <boost/geometry/geometries/concepts/check.hpp>
+
+#include <boost/geometry/util/type_traits_std.hpp>
+
+namespace boost { namespace geometry
+{
+
+
+#ifndef DOXYGEN_NO_DETAIL
+namespace detail { namespace is_empty
+{
+
+struct always_not_empty
+{
+    template <typename Geometry>
+    static inline bool apply(Geometry const&)
+    {
+        return false;
+    }
+};
+
+struct range_is_empty
+{
+    template <typename Range>
+    static inline bool apply(Range const& range)
+    {
+        return boost::empty(range);
+    }
+};
+
+class polygon_is_empty
+{
+    template <typename InteriorRings>
+    static inline bool check_interior_rings(InteriorRings const& interior_rings)
+    {
+        return std::all_of(boost::begin(interior_rings), boost::end(interior_rings),
+                           []( auto const& range ){ return boost::empty(range); });
+    }
+
+public:
+    template <typename Polygon>
+    static inline bool apply(Polygon const& polygon)
+    {
+        return boost::empty(exterior_ring(polygon))
+            && check_interior_rings(interior_rings(polygon));
+    }
+};
+
+template <typename Policy = range_is_empty>
+struct multi_is_empty
+{
+    template <typename MultiGeometry>
+    static inline bool apply(MultiGeometry const& multigeometry)
+    {
+        return std::all_of(boost::begin(multigeometry),
+                           boost::end(multigeometry),
+                           []( auto const& range ){ return Policy::apply(range); });
+    }
+};
+
+}} // namespace detail::is_empty
+#endif // DOXYGEN_NO_DETAIL
+
+
+#ifndef DOXYGEN_NO_DISPATCH
+namespace dispatch
+{
+
+template <typename Geometry, typename Tag =  typename tag<Geometry>::type>
+struct is_empty : not_implemented<Tag>
+{};
+
+template <typename Geometry>
+struct is_empty<Geometry, point_tag>
+    : detail::is_empty::always_not_empty
+{};
+
+template <typename Geometry>
+struct is_empty<Geometry, box_tag>
+    : detail::is_empty::always_not_empty
+{};
+
+template <typename Geometry>
+struct is_empty<Geometry, segment_tag>
+    : detail::is_empty::always_not_empty
+{};
+
+template <typename Geometry>
+struct is_empty<Geometry, linestring_tag>
+    : detail::is_empty::range_is_empty
+{};
+
+template <typename Geometry>
+struct is_empty<Geometry, ring_tag>
+    : detail::is_empty::range_is_empty
+{};
+
+template <typename Geometry>
+struct is_empty<Geometry, polygon_tag>
+    : detail::is_empty::polygon_is_empty
+{};
+
+template <typename Geometry>
+struct is_empty<Geometry, multi_point_tag>
+    : detail::is_empty::range_is_empty
+{};
+
+template <typename Geometry>
+struct is_empty<Geometry, multi_linestring_tag>
+    : detail::is_empty::multi_is_empty<>
+{};
+
+template <typename Geometry>
+struct is_empty<Geometry, multi_polygon_tag>
+    : detail::is_empty::multi_is_empty<detail::is_empty::polygon_is_empty>
+{};
+
+} // namespace dispatch
+#endif // DOXYGEN_NO_DISPATCH
+
+
+namespace resolve_dynamic
+{
+
+template <typename Geometry, typename Tag = typename tag<Geometry>::type>
+struct is_empty
+{
+    static inline bool apply(Geometry const& geometry)
+    {
+        concepts::check<Geometry const>();
+
+        return dispatch::is_empty<Geometry>::apply(geometry);
+    }
+};
+
+template <typename Geometry>
+struct is_empty<Geometry, dynamic_geometry_tag>
+{
+    static inline bool apply(Geometry const& geometry)
+    {
+        bool result = true;
+        traits::visit<Geometry>::apply([&](auto const& g)
+        {
+            result = is_empty<util::remove_cref_t<decltype(g)>>::apply(g);
+        }, geometry);
+        return result;
+    }
+};
+
+template <typename Geometry>
+struct is_empty<Geometry, geometry_collection_tag>
+{
+    static inline bool apply(Geometry const& geometry)
+    {
+        bool result = true;
+        detail::visit_breadth_first([&](auto const& g)
+        {
+            result = is_empty<util::remove_cref_t<decltype(g)>>::apply(g);
+            return result;
+        }, geometry);
+        return result;
+    }
+};
+
+} // namespace resolve_dynamic
+
+
+/*!
+\brief \brief_check{is the empty set}
+\ingroup is_empty
+\tparam Geometry \tparam_geometry
+\param geometry \param_geometry
+\return \return_check{is the empty set}
+
+\qbk{[include reference/algorithms/is_empty.qbk]}
+*/
+template <typename Geometry>
+inline bool is_empty(Geometry const& geometry)
+{
+    return resolve_dynamic::is_empty<Geometry>::apply(geometry);
+}
+
+
+}} // namespace boost::geometry
+
+
+#endif // BOOST_GEOMETRY_ALGORITHMS_IS_EMPTY_HPP