Added compact example

Update #318

examples/hdfgroup/H5D/CMakeLists.txt

@@ -6,4 +6,7 @@ add_executable(h5ex_d_checksum h5ex_d_checksum.cpp)
 target_link_libraries(h5ex_d_checksum h5cpp)
 
 add_executable(h5ex_d_chunk h5ex_d_chunk.cpp)
-target_link_libraries(h5ex_d_chunk h5cpp)
+target_link_libraries(h5ex_d_chunk h5cpp)
+
+add_executable(h5ex_d_compact h5ex_d_compact.cpp)
+target_link_libraries(h5ex_d_compact h5cpp)

examples/hdfgroup/H5D/h5ex_d_compact.cpp

@@ -0,0 +1,101 @@
+/************************************************************
+
+  This example shows how to read and write data to a compact
+  dataset.  The program first writes integers to a compact
+  dataset with dataspace dimensions of DIM0xDIM1, then
+  closes the file.  Next, it reopens the file, reads back
+  the data, and outputs it to the screen.
+
+  This file is intended for use with HDF5 Library version 1.8
+
+ ************************************************************/
+
+#include <h5cpp/hdf5.hpp>
+#include "matrix_hdf5.hpp"
+
+#define FILE            "h5ex_d_compact.h5"
+#define DATASET         "DS1"
+#define DIM0            4
+#define DIM1            7
+
+using Int32Matrix = Matrix<int32_t,DIM0,DIM1>;
+
+void write_data()
+{
+  using namespace hdf5;
+
+  //
+  // Create a new file using the default properties.
+  //
+  file::File file = file::create(FILE,file::AccessFlags::TRUNCATE);
+
+  //
+  // Create dataspace.  Setting maximum size to NULL sets the maximum
+  // size to be the current size.
+  //
+  dataspace::Simple space({DIM0,DIM1});
+
+  //
+  // Create the dataset creation property list, set the layout to
+  // compact.
+  //
+  property::LinkCreationList lcpl;
+  property::DatasetCreationList  dcpl;
+  dcpl.layout(property::DatasetLayout::COMPACT);
+
+  //
+  // Create the dataset.  We will use all default properties for this
+  // example.
+  //
+  node::Dataset dset(file.root(), DATASET, datatype::create<Int32Matrix>(),
+                     space,lcpl, dcpl);
+
+  //
+  // Initialize data
+  //
+  Int32Matrix data;
+  for (size_t i=0; i<DIM0; i++)
+      for (size_t j=0; j<DIM1; j++)
+          data(i,j) = i * j - j;
+
+  //
+  // write data to disk
+  //
+  dset.write(data);
+
+  std::cout<<"Data written to disk: "<<std::endl<<data<<std::endl;
+
+}
+
+void read_data()
+{
+  using namespace hdf5;
+
+  //
+  // Open file and dataset using the default properties.
+  //
+  file::File file = file::open(FILE,file::AccessFlags::READONLY);
+  node::Dataset dset = file.root()[DATASET];
+
+  //
+  // Retrieve the dataset creation property list, and print the
+  // storage layout.
+  //
+  property::DatasetCreationList dcpl = dset.creation_list();
+  std::cout<<"Storage layout is: "<<dcpl.layout()<<std::endl<<std::endl;
+
+  Int32Matrix data;
+  dset.read(data);
+
+  std::cout<<"Read data: "<<std::endl<<data<<std::endl;
+
+}
+
+int
+main (void)
+{
+   write_data();
+   read_data();
+
+   return 0;
+}