Add example files

src/01-basic-application.cc

+// -*- tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*-
+// vi: set et ts=4 sw=2 sts=2:
+
+#ifdef HAVE_CONFIG_H
+# include "config.h"
+#endif
+
+
+
+// included standard library headers
+#include <iostream>
+
+// included dune-common headers
+#include <dune/common/parallel/mpihelper.hh>
+#include <dune/common/exceptions.hh>
+
+
+
+
+int main(int argc, char** argv)
+{
+  try{
+    // Maybe initialize MPI
+    Dune::MPIHelper& helper = Dune::MPIHelper::instance(argc, argv);
+
+    // Print process rank
+    if(Dune::MPIHelper::isFake)
+      std::cout<< "This is a sequential program." << std::endl;
+    else
+      std::cout<<"I am rank "<<helper.rank()<<" of "<<helper.size()
+        <<" processes!"<<std::endl;
+
+    // Do nothing
+
+    return 0;
+  }
+  catch (Dune::Exception &e){
+    std::cerr << "Dune reported error: " << e << std::endl;
+  }
+  catch (...){
+    std::cerr << "Unknown exception thrown!" << std::endl;
+  }
+}

src/02-basic-grid-interface.cc

+// -*- tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*-
+// vi: set et ts=4 sw=2 sts=2:
+
+#ifdef HAVE_CONFIG_H
+# include "config.h"
+#endif
+
+
+
+// included standard library headers
+#include <iostream>
+#include <array>
+
+// included dune-common headers
+#include <dune/common/parallel/mpihelper.hh>
+#include <dune/common/exceptions.hh>
+#include <dune/common/fvector.hh>
+
+// included dune-grid headers
+#include <dune/grid/yaspgrid.hh>
+#include <dune/grid/io/file/vtk/vtkwriter.hh>
+
+
+
+int main(int argc, char** argv)
+{
+  try{
+    // Maybe initialize MPI
+    Dune::MPIHelper& helper = Dune::MPIHelper::instance(argc, argv);
+
+    // Print process rank
+    if(Dune::MPIHelper::isFake)
+      std::cout<< "This is a sequential program." << std::endl;
+    else
+      std::cout<<"I am rank "<<helper.rank()<<" of "<<helper.size()
+        <<" processes!"<<std::endl;
+
+    // fix grid dimension
+    const int dim = 2;
+    
+    // use the YaspGrid implementation
+    // YaspGrid = "Yet another structured parallel grid"
+    using Grid = Dune::YaspGrid<dim>;
+
+    // extension of the domain [0,l]
+    Dune::FieldVector<double,dim> l(1);
+
+    // start with 10x10x... elements
+    std::array<int,dim> E;
+    for(auto& e : E)
+      e = 2;
+
+    Grid grid(l, E);
+
+//    grid.globalRefine(2);
+
+    auto gridView = grid.leafGridView();
+
+    int i = 0;
+    for(const auto& e: Dune::elements(gridView))
+    {
+      ++i;
+      std::cout << e.geometry().center() << std::endl;
+    }
+    std::cout << i << std::endl;
+
+
+    using GridView = decltype(gridView);
+    Dune::VTKWriter<GridView> vtkWriter(gridView);
+    vtkWriter.write("01-refined-grid");
+
+    return 0;
+  }
+  catch (Dune::Exception &e){
+    std::cerr << "Dune reported error: " << e << std::endl;
+  }
+  catch (...){
+    std::cerr << "Unknown exception thrown!" << std::endl;
+  }
+}

src/CMakeLists.txt

 add_executable("dune-fu-tutorial" dune-fu-tutorial.cc)
 target_link_dune_default_libraries("dune-fu-tutorial")
+
+add_executable("01-basic-application" 01-basic-application.cc)
+target_link_dune_default_libraries("01-basic-application")
+
+add_executable("02-basic-grid-interface" 02-basic-grid-interface.cc)
+target_link_dune_default_libraries("02-basic-grid-interface")