Be explicit regarding mapping in step-12

diff --git a/examples/step-12/step-12.cc b/examples/step-12/step-12.cc
index 9480db17f457244439e15bce7268f27a31b03407..fcec1e2c1f998d2ffaba5d6cc9ba6f24502d0dd2 100644 (file)
--- a/examples/step-12/step-12.cc
+++ b/examples/step-12/step-12.cc
@@ -555,7 +555,8 @@ namespace Step12
 
     {
       Vector<float> values(triangulation.n_active_cells());
-      VectorTools::integrate_difference(dof_handler,
+      VectorTools::integrate_difference(mapping,
+                                        dof_handler,
                                         solution,
                                         Functions::ZeroFunction<dim>(),
                                         values,