Merge branch 'feature/vtksequencewriter-checkpoint-support' into 'master'

Add support for checkpointing to VTKSequenceWriter

See merge request !3

dune/grid/io/file/vtk/vtksequencewriter.hh

@@ -39,13 +39,15 @@ namespace Dune {
      *                   piece as well as the parallel collection file.
      */
     VTKSequenceWriter ( std::shared_ptr<VTKWriter<GridView> > vtkWriter,
-                        const std::string& name )
+                        const std::string& name,
+                        const std::vector<double>& timesteps = std::vector<double>())
       : VTKSequenceWriterBase<GridView>(vtkWriter,
                                         name,
                                         "",
                                         "",
                                         vtkWriter->gridView_.comm().rank(),
-                                        vtkWriter->gridView_.comm().size())
+                                        vtkWriter->gridView_.comm().size(),
+                                        timesteps)
     {}
 
     /** \brief Constructor with a given VTKWriter or SubsamplingVTKWriter
@@ -68,13 +70,15 @@ namespace Dune {
     VTKSequenceWriter ( std::shared_ptr<VTKWriter<GridView> > vtkWriter,
                         const std::string& name,
                         const std::string& path,
-                        const std::string& extendpath )
+                        const std::string& extendpath,
+                        const std::vector<double>& timesteps = std::vector<double>())
       : VTKSequenceWriterBase<GridView>(vtkWriter,
                                         name,
                                         path,
                                         extendpath,
                                         vtkWriter->gridView_.comm().rank(),
-                                        vtkWriter->gridView_.comm().size())
+                                        vtkWriter->gridView_.comm().size(),
+                                        timesteps)
     {}
 
     /** \brief Constructor creating its own VTKWriter object
@@ -87,10 +91,12 @@ namespace Dune {
                                  const std::string& name,
                                  const std::string& path,
                                  const std::string& extendpath,
-                                 VTK::DataMode dm = VTK::conforming )
+                                 VTK::DataMode dm = VTK::conforming,
+                                 const std::vector<double>& timesteps = std::vector<double>())
       : VTKSequenceWriterBase<GridView>(std::make_shared<VTKWriter<GridView> >(gridView,dm),
                                         name,path,extendpath,
-                                        gridView.comm().rank(), gridView.comm().size())
+                                        gridView.comm().rank(), gridView.comm().size(),
+                                        timesteps)
     {}
 
     ~VTKSequenceWriter() {}

dune/grid/io/file/vtk/vtksequencewriterbase.hh

@@ -47,8 +47,10 @@ namespace Dune {
                                     const std::string& path,
                                     const std::string& extendpath,
                                     int rank,
-                                    int size)
+                                    int size,
+                                    const std::vector<double>& timesteps)
       : vtkWriter_(vtkWriter),
+        timesteps_(timesteps),
         name_(name), path_(path),
         extendpath_(extendpath),
         rank_(rank),
@@ -141,6 +143,12 @@ namespace Dune {
         pvdFile.close();
       }
     }
+
+    const std::vector<double>& timeSteps() const
+    {
+      return timesteps_;
+    }
+
   private:
 
     // create sequence name