obsRestrictor is now stored as shared_ptr

dune/solvers/test/mmgtest.cc

@@ -58,8 +58,7 @@ void solveObstacleProblemByMMGSolver(const GridType& grid, const MatrixType& mat
     mmgStep.setIgnore(ignore);
     mmgStep.basesolver_        = &baseSolver;
     mmgStep.setSmoother(&smoother);
-    MandelObstacleRestrictor<VectorType> obsRestrictor;
-    mmgStep.obstacleRestrictor_= &obsRestrictor;
+    mmgStep.obstacleRestrictor_= std::make_shared<MandelObstacleRestrictor<VectorType> >();
 
     Dune::BitSetVector<blockSize> hasObstacle(x.size(),true);
     mmgStep.hasObstacle_       = &hasObstacle;