7.25.2.1.7 The iswlower function
Synopsis
#include <wctype.h>
int iswlower(wint_t wc);
Description
The iswlower function tests for any wide character that corresponds to a lowercase letter or is one of a locale-specific set of wide characters for which none of iswcntrl, iswdigit, iswpunct, or iswspace is true.