adds hdf5 single value write method

cpp/hdf5_tools.cpp

@@ -169,6 +169,36 @@ number hdf5_tools::read_value(
     return result;
 }
 
+template <typename number>
+int hdf5_tools::write_value_with_single_rank(
+        const hid_t group,
+        const std::string dset_name,
+        const number value)
+{
+    hid_t dset, mem_dtype;
+    if (typeid(number) == typeid(int))
+        mem_dtype = H5Tcopy(H5T_NATIVE_INT);
+    else if (typeid(number) == typeid(double))
+        mem_dtype = H5Tcopy(H5T_NATIVE_DOUBLE);
+    if (H5Lexists(group, dset_name.c_str(), H5P_DEFAULT))
+    {
+        dset = H5Dopen(group, dset_name.c_str(), H5P_DEFAULT);
+    }
+    else
+    {
+        hid_t fspace;
+        hsize_t count[1];
+        count[0] = 1;
+        fspace = H5Screate_simple(1, count, NULL);
+        dset = H5Dcreate(group, dset_name.c_str(), mem_dtype, fspace, H5P_DEFAULT, H5P_DEFAULT, H5P_DEFAULT);
+        H5Sclose(fspace);
+    }
+    H5Dwrite(dset, mem_dtype, H5S_ALL, H5S_ALL, H5P_DEFAULT, &value);
+    H5Dclose(dset);
+    H5Tclose(mem_dtype);
+    return EXIT_SUCCESS;
+}
+
 template <typename dtype>
 std::vector<dtype> hdf5_tools::read_vector_with_single_rank(
         const int myrank,
@@ -269,3 +299,15 @@ double hdf5_tools::read_value<double>(
         const hid_t,
         const std::string);
 
+template
+int hdf5_tools::write_value_with_single_rank<int>(
+        const hid_t group,
+        const std::string dset_name,
+        const int value);
+
+template
+int hdf5_tools::write_value_with_single_rank<double>(
+        const hid_t group,
+        const std::string dset_name,
+        const double value);
+

cpp/hdf5_tools.hpp

@@ -84,6 +84,12 @@ namespace hdf5_tools
     number read_value(
             const hid_t group,
             const std::string dset_name);
+
+    template <typename number>
+    int write_value_with_single_rank(
+            const hid_t group,
+            const std::string dset_name,
+            const number value);
 }
 
 #endif//HDF5_TOOLS_HPP