this_dir           38 test/io_dgf.cpp   const string this_dir {"/Users/christianpower/cpp/DISS_surfaces/test/"};
this_dir           42 test/io_dgf.cpp   const auto parameter_file = this_dir + "test_parameter.txt";
this_dir           45 test/io_dgf.cpp   const auto dgf_inputFile = this_dir + "input_test00.dgf";