#include <wctype.h> int iswpunct (wint_t wc);
The wide character class "punct" is a subclass of the wide character class "graph", and therefore also a subclass of the wide character class "print".
The wide character class "punct" is disjoint from the wide character class "alnum" and therefore also disjoint from its subclasses "alpha", "upper", "lower", "digit", "xdigit".
Being a subclass of the wide character class "print", the wide character class "punct" is disjoint from the wide character class "cntrl".
Being a subclass of the wide character class "graph", the wide character class "punct" is disjoint from the wide character class "space" and its subclass "blank".
This function's name is a misnomer when dealing with Unicode characters, because the wide character class "punct" contains both punctuation characters and symbol (math, currency, etc.) characters.