7.25.2.2.2 The wctype function
Synopsis
#include <wctype.h>
wctype_t wctype(const char *property);
Description
The wctype function constructs a value with type wctype_t that describes a class of wide characters identified by the string argument property.
The strings listed in the description of the iswctype function shall be valid in all locales as property arguments to the wctype function.
Returns
If property identifies a valid class of wide characters according to the LC_CTYPE category of the current locale, the wctype function returns a nonzero value that is valid as the second argument to the iswctype function; otherwise, it returns zero. *