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Function to get the exterior ring of a polygon (const version)
template<typename Polygon> ring_return_type<Polygon const>::type exterior_ring(Polygon const & polygon)
| Type | Concept | Name | Description | 
|---|---|---|---|
| Polygon const & | polygon type | polygon | the polygon to get the exterior ring from | 
a const reference to the exterior ring
Either
            #include <boost/geometry.hpp>
          
Or
            #include <boost/geometry/core/exterior_ring.hpp>