25 Localization library [localization]

namespace std {
  template <class charT>
    class ctype_byname : public ctype<charT> {
    public:
      using mask = typename ctype<charT>::mask;
      explicit ctype_byname(const char*, size_t refs = 0);
      explicit ctype_byname(const string&, size_t refs = 0);
    protected:
      ~ctype_byname();
    };
}