30 Localization library [localization]

30.4 Standard locale categories [locale.categories]

30.4.2 The ctype category [category.ctype]

30.4.2.2 Class template ctype [locale.ctype]

30.4.2.2.2 ctype members [locale.ctype.members]

bool is(mask m, charT c) const; const charT* is(const charT* low, const charT* high, mask* vec) const;
Returns: do_is(m, c) or do_is(low, high, vec).
const charT* scan_is(mask m, const charT* low, const charT* high) const;
Returns: do_scan_is(m, low, high).
const charT* scan_not(mask m, const charT* low, const charT* high) const;
Returns: do_scan_not(m, low, high).
charT toupper(charT c) const; const charT* toupper(charT* low, const charT* high) const;
Returns: do_toupper(c) or do_toupper(low, high).
charT tolower(charT c) const; const charT* tolower(charT* low, const charT* high) const;
Returns: do_tolower(c) or do_tolower(low, high).
charT widen(char c) const; const char* widen(const char* low, const char* high, charT* to) const;
Returns: do_widen(c) or do_widen(low, high, to).
char narrow(charT c, char dfault) const; const charT* narrow(const charT* low, const charT* high, char dfault, char* to) const;
Returns: do_narrow(c, dfault) or do_narrow(low, high, dfault, to).