multipolygon_type multipolygon_finish() {
try {
auto polygons = new std::vector<geos::geom::Geometry*>;
std::transform(m_polygons.begin(), m_polygons.end(), std::back_inserter(*polygons), [](std::unique_ptr<geos::geom::Polygon>& p) {
return p.release();
});
m_polygons.clear();
return multipolygon_type{m_geos_factory->createMultiPolygon(polygons)};
} catch (const geos::util::GEOSException& e) {
THROW(osmium::geos_geometry_error(e.what()));
}
}
