gatherv_test(comm, gps_generator(), "GPS positions");
gatherv_test(comm, string_generator(), "string");
gatherv_test(comm, string_list_generator(), "list of strings");
gatherv_test(comm, gps_generator(), "GPS positions");
gatherv_test(comm, string_generator(), "string");
gatherv_test(comm, string_list_generator(), "list of strings");