std::wctype
Min standard notice:
Header: <cwctype>
Constructs a value of type std::wctype_t that describes a LC_CTYPE category of wide character classification. It may be one of the standard classification categories, or a locale-specific category, such as “jkanji”.
# Declarations
std::wctype_t wctype( const char* str );
# Parameters
str: C string holding the name of the desired category
# Return value
std::wctype_t object suitable for use with std::iswctype to classify wide characters according to the named category of the current C locale or zero if str does not name a category supported by the current C locale.