template <class charT> bool isspace (charT c, const locale& loc); template <class charT> bool isprint (charT c, const locale& loc); template <class charT> bool iscntrl (charT c, const locale& loc); template <class charT> bool isupper (charT c, const locale& loc); template <class charT> bool islower (charT c, const locale& loc); template <class charT> bool isalpha (charT c, const locale& loc); template <class charT> bool isdigit (charT c, const locale& loc); template <class charT> bool ispunct (charT c, const locale& loc); template <class charT> bool isxdigit(charT c, const locale& loc); template <class charT> bool isalnum (charT c, const locale& loc); template <class charT> bool isgraph (charT c, const locale& loc); template <class charT> bool isblank (charT c, const locale& loc);
Each of these functions isF returns the result of the expression:
use_facet<ctype<charT>>(loc).is(ctype_base::F, c)
where F is the ctype_base::mask value corresponding to that function ([category.ctype]).232
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