<option>
	<type>string</type>
	<long>string</long>
	<short>s</short>
</option>

if (clo.get_string_option("string").size()) {
	cout << clo.get_string_option("string") << endl;
} else {
	cout << 0 << endl;
}

--string ok
-s gethim
--string Cool
--

ok
gethim
Cool
0
