As this is supposed to be nice C++ code we use references instead of pointers of course.

Fixes that in the documentation.

[[Imported from SVN: r4626]]

common/mpihelper.hh

 // -*- tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*-
 // vi: set et ts=4 sw=2 sts=2:
-// $Id: $
+// $Id:$
 #ifndef DUNE_MPIHELPER
 #define DUNE_MPIHELPER
 #if HAVE_MPI
@@ -45,6 +45,9 @@ namespace Dune
    * If one wants to have sequential program even if the code is
    * compiled with mpi then one simply has to exchange the typedef
    * with \code typedef Dune::MPIHelper FakeMPIHelper; \endcode.
+   *
+   * For checking whether we really use MPI or just fake please use
+   * MPIHelper::isFake (this is also possible at compile time!)
    */
   /**
    * @brief A fake mpi helper.
@@ -126,7 +129,7 @@ namespace Dune
      * that the main method of the program was called:
      * \code
      * int main(int argc, char** argv){
-     *   MPIHelper::instance(&argc, &argv);
+     *   MPIHelper::instance(argc, argv);
      *   // program code comes here
      *   ...
      * }
@@ -229,7 +232,7 @@ namespace Dune
      * that the main method of the program was called:
      * \code
      * int main(int argc, char** argv){
-     *   MPIHelper::instance(&argc, &argv);
+     *   MPIHelper::instance(argc, argv);
      *   // program code comes here
      *   ...
      * }