Cast away constness before assigning it to a non-const member

dune/solvers/iterationsteps/multigridstep.hh

@@ -123,7 +123,7 @@ namespace Dune {
         {
             mgTransfer_.resize(transfer.size());
             for(size_t j=0; j<transfer.size(); ++j)
-                mgTransfer_[j] = Dune::stackobject_to_shared_ptr(transfer[j]);
+                mgTransfer_[j] = Dune::stackobject_to_shared_ptr(*const_cast<DerivedTransfer*>(&transfer[j]));
         }
 
         virtual void iterate();