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1 // Boost.Geometry (aka GGL, Generic Geometry Library)
4 // Copyright (c) 2011-2012 Barend Gehrels, Amsterdam, the Netherlands.
6 // Use, modification and distribution is subject to the Boost Software License,
7 // Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
8 // http://www.boost.org/LICENSE_1_0.txt)
11 //` Get the number of interior rings in a multi-polygon
15 #include <boost/geometry.hpp>
16 #include <boost/geometry/geometries/point_xy.hpp>
17 #include <boost/geometry/geometries/polygon.hpp>
18 #include <boost/geometry/geometries/multi_polygon.hpp>
23 boost::geometry::model::multi_polygon
25 boost::geometry::model::polygon
27 boost::geometry::model::d2::point_xy
<double>
30 boost::geometry::read_wkt("MULTIPOLYGON(((0 0,0 10,10 0,0 0),(1 1,1 9,9 1,1 1)),((10 10,10 7,7 10,10 10)))", mp
);
31 std::cout
<< "Number of interior rings: " << boost::geometry::num_interior_rings(mp
) << std::endl
;
39 //[num_interior_rings_output
43 Number of interior rings: 1