Added const version of getRealEntity, for the compiler not to bitch.

[[Imported from SVN: r1611]]

grid/onedgrid.hh

@@ -295,6 +295,11 @@ namespace Dune {
       return entity.realEntity;
     }
 
+    template <int cd>
+    const OneDGridEntity<cd,dim,const OneDGrid>& getRealEntity(const typename Traits::template codim<cd>::Entity& entity) const {
+      return entity.realEntity;
+    }
+
     //! The type of grid refinement currently in use
     RefinementType refinementType_;
 

grid/sgrid.hh

@@ -891,6 +891,9 @@ namespace Dune {
     template<int codim>
     SEntity<codim,dim,const SGrid<dim,dimworld> >& getRealEntity(typename Traits::template codim<codim>::Entity& e );
 
+    template<int codim>
+    const SEntity<codim,dim,const SGrid<dim,dimworld> >& getRealEntity(const typename Traits::template codim<codim>::Entity& e ) const;
+
     template<int codim_, int dim_, class GridImp_, template<int,int,class> class EntityImp_>
     friend class Entity;
 

grid/yaspgrid.hh

@@ -1706,6 +1706,10 @@ namespace Dune {
     YaspEntity<codim,dim,const YaspGrid<dim,dimworld> >&
     getRealEntity(typename Traits::template codim<codim>::Entity& e );
 
+    template<int codim>
+    const YaspEntity<codim,dim,const YaspGrid<dim,dimworld> >&
+    getRealEntity(const typename Traits::template codim<codim>::Entity& e ) const ;
+
     template<int codim_, int dim_, class GridImp_, template<int,int,class> class EntityImp_>
     friend class Entity;