wctype - define character class
wctype_t wctype(const char *property);
[CX] The functionality described on this reference page is aligned with the ISO C standard. Any conflict between the requirements described here and the ISO C standard is unintentional. This volume of IEEE Std 1003.1-2001 defers to the ISO C standard.
The wctype() function is defined for valid character class names as defined in the current locale. The property argument is a string identifying a generic character class for which codeset-specific type information is required. The following character class names shall be defined in all locales:
Additional character class names defined in the locale definition file (category LC_CTYPE ) can also be specified.
The function shall return a value of type wctype_t, which can be used as the second argument to subsequent calls of iswctype(). The wctype() function shall determine values of wctype_t according to the rules of the coded character set defined by character type information in the program's locale (category LC_CTYPE ). The values returned by wctype() shall be valid until a call to setlocale() that modifies the category LC_CTYPE .
The wctype() function shall return 0 if the given character class name is not valid for the current locale (category LC_CTYPE ); otherwise, it shall return an object of type wctype_t that can be used in calls to iswctype().
No errors are defined.
iswctype(), the Base Definitions volume of IEEE Std 1003.1-2001, <wctype.h>
First released in Issue 4.
The following change has been made in this issue for alignment with ISO/IEC 9899:1990/Amendment 1:1995 (E):