Add adaptor making boost::geometry work with our geometry classes

Author: joto

src/geom-boost-adaptor.hpp

@@ -0,0 +1,84 @@
+#ifndef OSM2PGSQL_GEOM_BOOST_ADAPTOR_HPP
+#define OSM2PGSQL_GEOM_BOOST_ADAPTOR_HPP
+
+/**
+ * SPDX-License-Identifier: GPL-2.0-or-later
+ *
+ * This file is part of osm2pgsql (https://osm2pgsql.org/).
+ *
+ * Copyright (C) 2006-2022 by the osm2pgsql developer community.
+ * For a full list of authors see the git log.
+ */
+
+#include "geom.hpp"
+
+#include <boost/geometry.hpp>
+#include <boost/geometry/geometries/register/linestring.hpp>
+#include <boost/geometry/geometries/register/multi_linestring.hpp>
+#include <boost/geometry/geometries/register/multi_point.hpp>
+#include <boost/geometry/geometries/register/multi_polygon.hpp>
+#include <boost/geometry/geometries/register/point.hpp>
+#include <boost/geometry/geometries/register/ring.hpp>
+
+BOOST_GEOMETRY_REGISTER_POINT_2D_GET_SET(geom::point_t, double, cs::cartesian,
+                                         x, y, set_x, set_y)
+BOOST_GEOMETRY_REGISTER_LINESTRING(geom::linestring_t)
+BOOST_GEOMETRY_REGISTER_RING(geom::ring_t)
+
+BOOST_GEOMETRY_REGISTER_MULTI_POINT(geom::multipoint_t)
+BOOST_GEOMETRY_REGISTER_MULTI_LINESTRING(geom::multilinestring_t)
+BOOST_GEOMETRY_REGISTER_MULTI_POLYGON(geom::multipolygon_t)
+
+namespace boost {
+namespace geometry {
+namespace traits {
+template <>
+struct point_order<::geom::ring_t>
+{
+    static const order_selector value = counterclockwise;
+};
+
+template <>
+struct tag<::geom::polygon_t>
+{
+    typedef polygon_tag type;
+};
+template <>
+struct ring_const_type<::geom::polygon_t>
+{
+    typedef const ::geom::ring_t &type;
+};
+template <>
+struct ring_mutable_type<::geom::polygon_t>
+{
+    typedef ::geom::ring_t &type;
+};
+template <>
+struct interior_const_type<::geom::polygon_t>
+{
+    typedef const std::vector<::geom::ring_t> type;
+};
+template <>
+struct interior_mutable_type<::geom::polygon_t>
+{
+    typedef std::vector<::geom::ring_t> type;
+};
+
+template <>
+struct exterior_ring<::geom::polygon_t>
+{
+    static auto &get(::geom::polygon_t &p) { return p.outer(); }
+    static auto &get(::geom::polygon_t const &p) { return p.outer(); }
+};
+
+template <>
+struct interior_rings<::geom::polygon_t>
+{
+    static auto get(::geom::polygon_t &p) { return p.inners(); }
+    static auto get(::geom::polygon_t const &p) { return p.inners(); }
+};
+} // namespace traits
+} // namespace geometry
+} // namespace boost
+
+#endif // OSM2PGSQL_GEOM_BOOST_ADAPTOR_HPP