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iswupper - test for uppercase wide character
#include <wctype.h> int iswupper(wint_t wc);
The wide-character class "upper" is a subclass of the wide-character class "alpha", and therefore also a subclass of the wide-character class "alnum", 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 "upper" is disjoint from the wide-character class "cntrl".
Being a subclass of the wide-character class "graph", the wide-character class "upper" 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 "upper" is disjoint from the wide-character class "punct".
Being a subclass of the wide-character class "alpha", the wide-character class "upper" is disjoint from the wide-character class "digit".
The wide-character class "upper" contains at least those characters wc which are equal to towupper(wc) and different from towlower(wc).
The wide-character class "upper" always contains at least the letters aqAaq to aqZaq.
This function is not very appropriate for dealing with Unicode characters, because Unicode knows about three cases: upper, lower and title case.
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