Fix a bug uncovered by Ralf's recent checks in get_function_values.

git-svn-id: https://svn.dealii.org/trunk@3207 0785d39b-7218-0410-832d-ea1e28bc413d

diff --git a/deal.II/deal.II/source/numerics/vectors.cc b/deal.II/deal.II/source/numerics/vectors.cc
index 5c439e143b113d6173d493f3551de5dc71e7e8df..d022ef6802d42f2694f825678a8087a4cfa61a1c 100644 (file)
--- a/deal.II/deal.II/source/numerics/vectors.cc
+++ b/deal.II/deal.II/source/numerics/vectors.cc
@@ -809,7 +809,7 @@ VectorTools::integrate_difference (const DoFHandler<dim>    &dof,
   UpdateFlags update_flags = UpdateFlags (update_q_points  |
                                          update_JxW_values);
   if (norm != H1_seminorm)
-    update_flags != update_values;
+    update_flags = UpdateFlags(update_flags | update_values);
   
   if ((norm==H1_seminorm) || (norm==H1_norm))
     update_flags = UpdateFlags (update_flags | update_gradients);