give multigrid hint in step-50

git-svn-id: https://svn.dealii.org/trunk@29564 0785d39b-7218-0410-832d-ea1e28bc413d

diff --git a/deal.II/examples/step-50/step-50.cc b/deal.II/examples/step-50/step-50.cc
index c1864b3ea4cb5aea06e5ff945d37bc2e3e4090a7..d7593ead9ab96048a2a60360aab54d983303d67c 100644 (file)
--- a/deal.II/examples/step-50/step-50.cc
+++ b/deal.II/examples/step-50/step-50.cc
@@ -281,7 +281,8 @@ namespace Step50
   LaplaceProblem<dim>::LaplaceProblem (const unsigned int degree)
     :
     triangulation (MPI_COMM_WORLD,Triangulation<dim>::
-                   limit_level_difference_at_vertices),
+                   limit_level_difference_at_vertices,
+                   parallel::distributed::Triangulation<dim>::construct_multigrid_hierarchy),
     fe (degree),
     mg_dof_handler (triangulation),
     degree(degree)