code: public final <R> R get(ChronoFunction<ChronoInterval<T>, R> function) {
  
          return function.apply(this);
  
      }
docs: /*[deutsch]
  <p>L&auml;&szlig;t die angegebene Abfrage dieses Intervall auswerten. </p>
  
  @param   <R> generic type of result of query
  @param   function    interval query
  @return  result of query or {@code null} if undefined
  @throws  net.time4j.engine.ChronoException if the given query is not executable
  @see     HolidayModel#firstBusinessDay()
  @see     HolidayModel#lastBusinessDay()
  @since   4.24