Iswblankwintt

Iswblankwintt is a term used in some discussions of wide-character classification extensions for C and C++. It is not part of the ISO C standard and does not appear in the official <wctype.h> API. The name blends iswblank, a standard wide-character predicate, with wint_t, the integer type used to represent wide characters, suggesting a variant that operates specifically on wint_t values.

If defined, the hypothetical function would have a signature such as int iswblankwintt(wint_t wc); and would return a nonzero value when wc represents a blank wide character according to the current locale, and 0 otherwise. Like iswblank, its behavior would depend on the active locale, meaning that which characters are considered blank could vary by environment.

Portability and usage considerations are important. Because iswblankwintt is not part of the standard library, code relying on it would lack portability across compilers and platforms. In standard practice, similar functionality is achieved with iswblank or alternative predicates like iswspace, depending on the exact definition of “blank” desired, and with explicit handling of locale via setlocale if necessary.

Related concepts include iswblank, iswspace, wint_t, wchar_t, and the <wctype.h> header. For portable wide-character classification, developers typically prefer standard functions and well-defined types, reserving non-standard extensions like iswblankwintt for platforms with explicit library support and documented behavior.