...one of the most highly regarded and expertly designed C++ library projects in the world. — Herb Sutter and Andrei Alexandrescu, C++ Coding Standards
...one of the most highly regarded and expertly designed C++ library projects in the world.
boost::algorithm::is_digit — is_digit predicate
unspecified is_digit(const std::locale & Loc = std::locale());
Construct the is_classified predicate for the ctype_base::digit category.
is_classified
ctype_base::digit
Loc
A locale used for classification
An instance of the is_classified predicate