Function parseDuration

cpp/core/CommonOptions.cpp:20–30

};

Duration parseDuration(CommandLineArgs& args) {
    size_t idx;
    auto arg = args.getArg();
    uint64_t x = std::stoull(arg, &idx);
	auto unit = arg.substr(idx);
	if (!durationUnitMap.contains(unit)) {
		fprintf(stderr, "Invalid duration unit: %s\n", unit.c_str());
		args.dieWithUsage();
	}
    return x * durationUnitMap.at(arg.substr(idx));
}