static const struct option long_options[] = {
{"help", no_argument, nullptr, 'h'},
{"version", no_argument, nullptr, 'V'},
{"loglevel", required_argument, nullptr, 'l'},
static const struct option long_options[] = {
{"help", no_argument, nullptr, 'h'},
{"version", no_argument, nullptr, 'V'},
{"loglevel", required_argument, nullptr, 'l'},