# File xapian.rb, line 270
    def allterms(pref = '', &block)
      Xapian._safelyIterate(self._dangerous_allterms_begin(pref),
                            self._dangerous_allterms_end(pref),
                            lambda { |item| Xapian::Term.new(item.term, 0, item.termfreq) },
                            &block)
    end