Add DynamicGeometry adaptation for std::any.

include/boost/geometry/geometries/adapted/boost_any.hpp

@@ -15,12 +15,12 @@
 
 #include <boost/any.hpp>
 
+#include <boost/geometry/geometries/adapted/detail/any.hpp>
+
 #include <boost/geometry/core/geometry_types.hpp>
 #include <boost/geometry/core/tag.hpp>
 #include <boost/geometry/core/tags.hpp>
 #include <boost/geometry/core/visit.hpp>
-#include <boost/geometry/util/sequence.hpp>
-#include <boost/geometry/util/type_traits_std.hpp>
 
 
 namespace boost { namespace geometry
@@ -29,56 +29,16 @@ namespace boost { namespace geometry
 namespace detail
 {
 
-template <typename TypeSequence, std::size_t N = util::sequence_size<TypeSequence>::value>
-struct visit_boost_any
-{
-    static const std::size_t M = N / 2;
 
-    template <std::size_t Offset, typename Function, typename Any>
-    static bool apply(Function && function, Any && any)
+struct boost_any_cast_policy
+{
+    template <typename T, typename Any>
+    static inline T * apply(Any * any_ptr)
     {
-        return visit_boost_any<TypeSequence, M>::template apply<Offset>(
-                    std::forward<Function>(function), std::forward<Any>(any))
-            || visit_boost_any<TypeSequence, N - M>::template apply<Offset + M>(
-                    std::forward<Function>(function), std::forward<Any>(any));
+        return boost::any_cast<T>(any_ptr);
     }
 };
 
-template <typename TypeSequence>
-struct visit_boost_any<TypeSequence, 1>
-{
-    template <std::size_t Offset, typename Function, typename Any>
-    static bool apply(Function && function, Any && any)
-    {
-        using elem_t = typename util::sequence_element<Offset, TypeSequence>::type;
-        using geom_t = util::transcribe_const_t<std::remove_reference_t<Any>, elem_t>;
-        geom_t * g = boost::any_cast<geom_t>(boost::addressof(any));
-        if (g != nullptr)
-        {
-            using geom_ref_t = std::conditional_t
-                <
-                    std::is_rvalue_reference<decltype(any)>::value,
-                    geom_t&&, geom_t&
-                >;
-            function(static_cast<geom_ref_t>(*g));
-            return true;
-        }
-        else
-        {
-            return false;
-        }
-    }
-};
-
-template <typename TypeSequence>
-struct visit_boost_any<TypeSequence, 0>
-{
-    template <std::size_t Offset, typename Function, typename Any>
-    static bool apply(Function &&, Any &&)
-    {
-        return false;
-    }
-};
 
 } // namespace detail
 
@@ -98,8 +58,10 @@ struct visit<boost::any>
     static void apply(Function && function, Any && any)
     {
         using types_t = typename geometry_types<util::remove_cref_t<Any>>::type;
-        geometry::detail::visit_boost_any<types_t>::template apply<0>(
-            std::forward<Function>(function), std::forward<Any>(any));
+        geometry::detail::visit_any
+            <
+                geometry::detail::boost_any_cast_policy, types_t
+            >::template apply<0>(std::forward<Function>(function), std::forward<Any>(any));
     }
 };
 

include/boost/geometry/geometries/adapted/detail/any.hpp

@@ -0,0 +1,87 @@
+// Boost.Geometry
+
+// Copyright (c) 2021, Oracle and/or its affiliates.
+
+// 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_GEOMETRIES_ADAPTED_DETAIL_ANY_HPP
+#define BOOST_GEOMETRY_GEOMETRIES_ADAPTED_DETAIL_ANY_HPP
+
+
+#include <utility>
+
+#include <boost/geometry/util/sequence.hpp>
+#include <boost/geometry/util/type_traits_std.hpp>
+
+
+namespace boost { namespace geometry
+{
+
+namespace detail
+{
+
+template
+<
+    typename CastPolicy,
+    typename TypeSequence,
+    std::size_t N = util::sequence_size<TypeSequence>::value
+>
+struct visit_any
+{
+    static const std::size_t M = N / 2;
+
+    template <std::size_t Offset, typename Function, typename Any>
+    static bool apply(Function && function, Any && any)
+    {
+        return visit_any<CastPolicy, TypeSequence, M>::template apply<Offset>(
+                    std::forward<Function>(function), std::forward<Any>(any))
+            || visit_any<CastPolicy, TypeSequence, N - M>::template apply<Offset + M>(
+                    std::forward<Function>(function), std::forward<Any>(any));
+    }
+};
+
+template <typename CastPolicy, typename TypeSequence>
+struct visit_any<CastPolicy, TypeSequence, 1>
+{
+    template <std::size_t Offset, typename Function, typename Any>
+    static bool apply(Function && function, Any && any)
+    {
+        using elem_t = typename util::sequence_element<Offset, TypeSequence>::type;
+        using geom_t = util::transcribe_const_t<std::remove_reference_t<Any>, elem_t>;
+        geom_t * g = CastPolicy::template apply<geom_t>(&any);
+        if (g != nullptr)
+        {
+            using geom_ref_t = std::conditional_t
+                <
+                    std::is_rvalue_reference<decltype(any)>::value,
+                    geom_t&&, geom_t&
+                >;
+            function(static_cast<geom_ref_t>(*g));
+            return true;
+        }
+        else
+        {
+            return false;
+        }
+    }
+};
+
+template <typename CastPolicy, typename TypeSequence>
+struct visit_any<CastPolicy, TypeSequence, 0>
+{
+    template <std::size_t Offset, typename Function, typename Any>
+    static bool apply(Function &&, Any &&)
+    {
+        return false;
+    }
+};
+
+} // namespace detail
+
+}} // namespace boost::geometry
+
+
+#endif // BOOST_GEOMETRY_GEOMETRIES_ADAPTED_DETAIL_ANY_HPP

include/boost/geometry/geometries/adapted/std_any.hpp

@@ -0,0 +1,82 @@
+// Boost.Geometry
+
+// Copyright (c) 2021, Oracle and/or its affiliates.
+
+// 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_GEOMETRIES_ADAPTED_STD_ANY_HPP
+#define BOOST_GEOMETRY_GEOMETRIES_ADAPTED_STD_ANY_HPP
+
+
+#include <boost/config.hpp>
+
+#ifndef BOOST_NO_CXX17_HDR_ANY
+
+
+#include <any>
+#include <utility>
+
+#include <boost/geometry/geometries/adapted/detail/any.hpp>
+
+#include <boost/geometry/core/geometry_types.hpp>
+#include <boost/geometry/core/tag.hpp>
+#include <boost/geometry/core/tags.hpp>
+#include <boost/geometry/core/visit.hpp>
+
+
+namespace boost { namespace geometry
+{
+
+namespace detail
+{
+
+
+struct std_any_cast_policy
+{
+    template <typename T, typename Any>
+    static inline T * apply(Any * any_ptr)
+    {
+        return std::any_cast<T>(any_ptr);
+    }
+};
+
+
+} // namespace detail
+
+namespace traits
+{
+
+template <>
+struct tag<std::any>
+{
+    typedef dynamic_geometry_tag type;
+};
+
+template <>
+struct visit<std::any>
+{
+    template <typename Function, typename Any>
+    static void apply(Function && function, Any && any)
+    {
+        using types_t = typename geometry_types<util::remove_cref_t<Any>>::type;
+        geometry::detail::visit_any
+            <
+                geometry::detail::std_any_cast_policy, types_t
+            >::template apply<0>(std::forward<Function>(function), std::forward<Any>(any));
+    }
+};
+
+
+} // namespace traits
+
+
+}} // namespace boost::geometry
+
+
+#endif // BOOST_NO_CXX17_HDR_ANY
+
+
+#endif // BOOST_GEOMETRY_GEOMETRIES_ADAPTED_STD_ANY_HPP

test/algorithms/detail/visit.cpp

@@ -15,6 +15,7 @@
 #include <boost/geometry/geometries/adapted/boost_any.hpp>
 #include <boost/geometry/geometries/adapted/boost_variant.hpp>
 #include <boost/geometry/geometries/adapted/boost_variant2.hpp>
+#include <boost/geometry/geometries/adapted/std_any.hpp>
 #include <boost/geometry/geometries/adapted/std_variant.hpp>
 #include <boost/geometry/geometries/geometries.hpp>
 #include <boost/geometry/util/type_traits.hpp>
@@ -34,6 +35,16 @@ struct geometry_types<boost::any>
     typedef util::type_sequence<point_t, linestring_t, polygon_t> type;
 };
 
+#ifndef BOOST_NO_CXX17_HDR_ANY
+
+template <>
+struct geometry_types<std::any>
+{
+    typedef util::type_sequence<point_t, linestring_t, polygon_t> type;
+};
+
+#endif // BOOST_NO_CXX17_HDR_ANY
+
 }}}
 
 
@@ -200,6 +211,9 @@ int test_main(int, char* [])
     test_all<boost::variant<point_t, linestring_t, polygon_t>>();
     test_all<boost::variant2::variant<point_t, linestring_t, polygon_t>>();
 
+#ifndef BOOST_NO_CXX17_HDR_ANY
+    test_all<std::any>();
+#endif
 #ifndef BOOST_NO_CXX17_HDR_VARIANT
     test_all<std::variant<point_t, linestring_t, polygon_t>>();
 #endif

test/core/visit.cpp

@@ -18,6 +18,8 @@
 #include <boost/geometry/geometries/adapted/boost_any.hpp>
 #include <boost/geometry/geometries/adapted/boost_variant.hpp>
 #include <boost/geometry/geometries/adapted/boost_variant2.hpp>
+#include <boost/geometry/geometries/adapted/std_any.hpp>
+#include <boost/geometry/geometries/adapted/std_variant.hpp>
 #include <boost/geometry/geometries/geometries.hpp>
 #include <boost/geometry/util/type_traits.hpp>
 
@@ -36,6 +38,16 @@ struct geometry_types<boost::any>
     typedef util::type_sequence<point_t, linestring_t, polygon_t> type;
 };
 
+#ifndef BOOST_NO_CXX17_HDR_ANY
+
+template <>
+struct geometry_types<std::any>
+{
+    typedef util::type_sequence<point_t, linestring_t, polygon_t> type;
+};
+
+#endif // BOOST_NO_CXX17_HDR_ANY
+
 }}}
 
 
@@ -198,5 +210,12 @@ int test_main(int, char* [])
     test_all<boost::variant<point_t, linestring_t, polygon_t>>();
     test_all<boost::variant2::variant<point_t, linestring_t, polygon_t>>();
 
+#ifndef BOOST_NO_CXX17_HDR_ANY
+    test_all<std::any>();
+#endif
+#ifndef BOOST_NO_CXX17_HDR_VARIANT
+    test_all<std::variant<point_t, linestring_t, polygon_t>>();
+#endif
+
     return 0;
 }