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libwchar2 0.0.10
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iswupper - test for uppercase wide character
The iswupper() function is the wide-character equivalent of the isup- per(3) function. It tests whether wc is a wide character belonging to the wide-character class upper.
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-charac- ter class upper is disjoint from the wide-character class cntrl.
Being a subclass of the wide-character class graph, the wide-charac- ter 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-charac- ter class upper is disjoint from the wide-character class punct.
Being a subclass of the wide-character class alpha, the wide-charac- ter 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 A to Z.
The iswupper() function returns nonzero if wc is a wide character belonging to the wide-character class upper.
Otherwise, it returns zero.
The behavior of iswupper() depends on the LC_CTYPE category of the current locale.
This function is not very appropriate for dealing with Unicode characters, because Unicode knows about three cases: upper, lower and title case.
1.8.14