Originální popis anglicky:
iswxdigit - test for hexadecimal digit wide character
Návod, kniha: Linux Programmer's Manual
#include <wctype.h>
int iswxdigit(wint_t wc);
The
iswxdigit function is the wide-character equivalent of the
isxdigit function. It tests whether
wc is a wide character
belonging to the wide character class "xdigit".
The wide character class "xdigit" is a subclass of the wide character
class "alnum", and therefore also a subclass of the wide character
class "graph" and of the wide character class "print".
Being a subclass of the wide character class "print", the wide
character class "xdigit" is disjoint from the wide character class
"cntrl".
Being a subclass of the wide character class "graph", the wide
character class "xdigit" is disjoint from the wide character class
"space" and its subclass "blank".
Being a subclass of the wide character class "alnum", the wide
character class "xdigit" is disjoint from the wide character class
"punct".
The wide character class "xdigit" always contains at least the letters
'A' to 'F', 'a' to 'f' and the digits '0' to '9'.
The
iswxdigit function returns non-zero if
wc is a wide character
belonging to the wide character class "xdigit". Otherwise it returns
zero.
ISO/ANSI C, UNIX98
iswctype(3),
isxdigit(3)
The behaviour of
iswxdigit depends on the LC_CTYPE category of the
current locale.
