getIterationStep returns a shared_ptr now

dune/solvers/iterationsteps/mmgstep.cc

@@ -66,8 +66,8 @@ preprocess()
 
         typedef ProjectedBlockGSStep<MatrixType, VectorType> SmootherType;
 
-        dynamic_cast<SmootherType*>(&loopBaseSolver->getIterationStep())->hasObstacle_ = hasObstacleHierarchy_[0].get();
-        dynamic_cast<SmootherType*>(&loopBaseSolver->getIterationStep())->obstacles_   = obstacleHierarchy_[0].get();
+        std::dynamic_pointer_cast<SmootherType>(loopBaseSolver->getIterationStep())->hasObstacle_ = hasObstacleHierarchy_[0].get();
+        std::dynamic_pointer_cast<SmootherType>(loopBaseSolver->getIterationStep())->obstacles_   = obstacleHierarchy_[0].get();
 
 #if HAVE_IPOPT
     } else if (typeid(*this->basesolver_) == typeid(QuadraticIPOptSolver<MatrixType,VectorType>)) {

dune/solvers/iterationsteps/multigridstep.cc

@@ -162,7 +162,7 @@ void MultigridStep<MatrixType, VectorType, BitVectorType>::preprocess()
         typedef ::LoopSolver<VectorType> DuneSolversLoopSolver;
 
         if (auto loopBaseSolver = std::dynamic_pointer_cast<DuneSolversLoopSolver>(this->basesolver_)) {
-            auto iterationStep = dynamic_cast<SmootherType*>(&loopBaseSolver->getIterationStep());
+            auto iterationStep = std::dynamic_pointer_cast<SmootherType>(loopBaseSolver->getIterationStep());
             assert(iterationStep);
             iterationStep->setProblem(*(this->matrixHierarchy_[0]), *this->xHierarchy_[0], this->rhsHierarchy_[0]);
             iterationStep->setIgnore(*ignoreNodesHierarchy_[0]);