H5Easy::dump(file, "/path/to/A", A, H5Easy::DumpMode::Overwrite); H5Easy::dump(file, "/path/to/B", B); H5Easy::dump(file, "/path/to/B", B, H5Easy::DumpMode::Overwrite ...

If you want you can run the executable: In principle the same instruction as for HDF5 can be used. However, HighFive is much less popular compared to HDF5 and therefore the system package manager ...