boost::algorithm::is_xdigit — is_xdigit predicate
// In header: <boost/algorithm/string/classification.hpp> unspecified is_xdigit(const std::locale & Loc = std::locale());
Construct the is_classified predicate for the ctype_base::xdigit category.
is_classified
ctype_base::xdigit
Parameters:
Loc
A locale used for classification
Returns:
An instance of the is_classified predicate
