25 Localization library [localization]

25.3 Locales [locales]

25.3.3 Convenience interfaces [locale.convenience]

25.3.3.2 Conversions [conversions]

25.3.3.2.1 Character conversions [conversions.character]

template <class charT> charT toupper(charT c, const locale& loc);

template <class charT> charT tolower(charT c, const locale& loc);