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Metafunction defining type as the interior_type (container type of inner rings) of the specified geometry type.
Interior rings should be organized as a container (std::vector, std::deque, boost::array) with Boost.Range support. This metafunction defines the type of the container.
template<typename Geometry> struct interior_type { // ... };
| Parameter | Description | 
|---|---|
| typename Geometry | A type fullfilling the Polygon or MultiPolygon concept. | 
Either
          #include <boost/geometry.hpp>
        
Or
          #include <boost/geometry/core/interior_type.hpp>
        
Compile time
Shows how to use the interior_type metafunction
#include <iostream> #include <typeinfo> #include <boost/geometry.hpp> #include <boost/geometry/geometries/polygon.hpp> #include <boost/geometry/geometries/ring.hpp> #include <boost/geometry/geometries/adapted/boost_array.hpp> BOOST_GEOMETRY_REGISTER_BOOST_ARRAY_CS(cs::cartesian) int main() { // Define a polygon storing points in a deque and storing interior rings // in a list (note that std::list is not supported by most algorithms // because not supporting a random access iterator) typedef boost::geometry::model::polygon < boost::array<short, 3>, true, true, std::deque, std::list > polygon; std::cout << typeid(boost::geometry::interior_type<polygon>::type).name() << std::endl; return 0; }
Output (using MSVC) is a long story (part manually replaced with ellipsis):
class std::list<class boost::geometry::model::ring<class boost::array<short,3>,1,1,class std::deque,class std::allocator>,class std::allocator<...> > >