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### 3.22 `iswlower`, `iswlower_l`—lowercase wide character test

Synopsis

    #include <wctype.h>
    int iswlower(wint_t c);

    #include <wctype.h>
    int iswlower_l(wint_t c, locale_t locale);

Description
`iswlower` is a function which classifies wide-character values that are categorized as lowercase.

`iswlower_l` is like `iswlower` but performs the check based on the locale specified by the locale object locale. If locale is LC_GLOBAL_LOCALE or not a valid locale object, the behaviour is undefined.

Returns
`iswlower`, `iswlower_l` return non-zero if c is a lowercase wide character.

Portability
`iswlower` is C99. `iswlower_l` is POSIX-1.2008.

No supporting OS subroutines are required.