30 Localization library [localization]

30.3 Locales [locales]

30.3.3 Convenience interfaces [locale.convenience]

30.3.3.2 Character conversions [conversions.character]

template<class charT> charT toupper(charT c, const locale& loc);
Returns: use_­facet<ctype<charT>>(loc).toupper(c).
template<class charT> charT tolower(charT c, const locale& loc);
Returns: use_­facet<ctype<charT>>(loc).tolower(c).