Wide-character classification
#include <wctype.h> int iswctype(wint_t wc, wctype_t desc);
If wc is a wide character having the character property designated by desc (or in other words: belongs to the character class designated by desc), the iswctype() function returns nonzero. Otherwise, it returns zero. If wc is WEOF, zero is returned.
desc must be a character property descriptor returned by the wctype(3) function.
The iswctype() function returns nonzero if the wc has the designated property. Otherwise, it returns 0.
The iswctype() function is thread-safe.
C99.
The behavior of iswctype() depends on the LC_CTYPE category of the current locale.
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