Boost C++ Libraries

namespace boost {
  namespace numeric {
    namespace odeint {
      template<typename ErrorStepper, typename ErrorChecker, typename Resizer> 
        class controlled_runge_kutta<ErrorStepper, ErrorChecker, Resizer, explicit_error_stepper_fsal_tag>;
      template<typename ErrorStepper, typename ErrorChecker, typename Resizer> 
        class controlled_runge_kutta<ErrorStepper, ErrorChecker, Resizer, explicit_error_stepper_tag>;

      template<typename Value, typename Algebra, typename Operations> 
        class default_error_checker;
    }
  }
}