Correction: The gridView_() method in the newtoncontroller may return a...

Correction: The gridView_() method in the newtoncontroller may return a reference, because the reference is on a copy of the gridview, which is stored in the problem. Trouble may be ahead, if the gridview is called as reference via the grid object.

Discussed with Markus and Bernd

git-svn-id: svn://svn.iws.uni-stuttgart.de/DUMUX/dumux/trunk@12107 2fb0f335-1f38-0410-981e-8018bf24f1b0

dumux/nonlinear/newtoncontroller.hh

@@ -592,7 +592,7 @@ protected:
     /*!
      * \brief Returns a reference to the grid view.
      */
-    const GridView gridView_() const
+    const GridView &gridView_() const
     { return problem_().gridView(); }
 
     /*!