The
iswctype() function returns a boolean value that indicates whether a wide character
wc is in
charclass.
The behaviour of
iswctype() is undefined if the
iswctype() function is called with an invalid
charclass (changes of
LC_CTYPE category invalidate
charclass) or invalid wide character
wc.
The behaviour of
iswctype() is affected by the
LC_CTYPE category of the current locale.