Use only files needed and add documantation

git-svn-id: https://svn.dealii.org/trunk@24275 0785d39b-7218-0410-832d-ea1e28bc413d

diff --git a/deal.II/examples/step-12/step-12.cc b/deal.II/examples/step-12/step-12.cc
index b1a1ab8c2db5ef38b741848d490f4ea365c678cf..bb011190682d6e00424885c8841d34a7497887cd 100644 (file)
--- a/deal.II/examples/step-12/step-12.cc
+++ b/deal.II/examples/step-12/step-12.cc
@@ -59,10 +59,31 @@
 #include <deal.II/numerics/derivative_approximation.h>
 
                                 // Here come the new include files
-                                // for using the MeshWorker framework:
+                                // for using the MeshWorker
+                                // framework. The first contains the
+                                // class
+                                // MeshWorker::DoFInfo,
+                                // which provides local integrators
+                                // with a mapping between local and
+                                // global degrees of freedom. It
+                                // stores the results of local
+                                // integrals as well in its base
+                                // class Meshworker::LocalResults.
+                                // In the second of these files, we
+                                // find an object of type
+                                // MeshWorker::IntegrationInfo, which
+                                // is mostly a wrapper around a group
+                                // of FEValues objects. The file
+                                // <tt>meshworker/simple.h</tt>
+                                // contains classes assembling
+                                // locally integrated data into a
+                                // global system containing only a
+                                // single matrix. Finally, we will
+                                // need the file that runs the loop
+                                // over all mesh cells and faces.
 #include <deal.II/meshworker/dof_info.h>
 #include <deal.II/meshworker/integration_info.h>
-#include <deal.II/meshworker/assembler.h>
+#include <deal.II/meshworker/simple.h>
 #include <deal.II/meshworker/loop.h>
 
                                 // Like in all programs, we finish