namespace boost {
  namespace numeric {
    namespace odeint {
      template<typename Value, typename Algebra, typename Operations> 
        class default_error_checker;
      template<typename ErrorStepper, 
               typename ErrorChecker = default_error_checker< typename ErrorStepper::value_type ,typename ErrorStepper::algebra_type ,typename ErrorStepper::operations_type >, 
               typename Resizer = typename ErrorStepper::resizer_type, 
               typename ErrorStepperCategory = typename ErrorStepper::stepper_category> 
        class controlled_runge_kutta;

      template<typename ErrorStepper, typename ErrorChecker, typename Resizer> 
        class controlled_runge_kutta<ErrorStepper, ErrorChecker, Resizer, explicit_error_stepper_tag>;
      template<typename ErrorStepper, typename ErrorChecker, typename Resizer> 
        class controlled_runge_kutta<ErrorStepper, ErrorChecker, Resizer, explicit_error_stepper_fsal_tag>;
    }
  }
}