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## Function template integrate_const

boost::numeric::odeint::integrate_const — Integrates the ODE with constant step size.

## Synopsis

    // In header: <boost/numeric/odeint/integrate/integrate_const.hpp>

    template<typename Stepper, typename System, typename State, typename Time,
             typename Observer, typename StepOverflowChecker>
      size_t integrate_const(Stepper stepper, System system, State & start_state,
                             Time start_time, Time end_time, Time dt,
                             Observer observer, StepOverflowChecker checker);

## Description

Integrates the ODE defined by system using the given stepper. This method ensures that the observer is called at constant intervals dt. If the Stepper is a normal stepper without step size control, dt is also used for the numerical scheme. If a ControlledStepper is provided, the algorithm might reduce the step size to meet the error bounds, but it is ensured that the observer is always called at equidistant time points t0 + n*dt. If a DenseOutputStepper is used, the step size also may vary and the dense output is used to call the observer at equidistant time points. If a `max_step_checker` is provided as StepOverflowChecker, a no_progress_error is thrown if too many steps (default: 500) are performed without progress, i.e. in between observer calls. If no checker is provided, no such overflow check is performed.

Parameters: |
`checker` | [optional] Functor to check for step count overflows, if no checker is provided, no exception is thrown.
`dt` | The time step between observer calls, not necessarily the time step of the integration.
`end_time` | The final integration time tend.
`observer` | [optional] Function/Functor called at equidistant time intervals.
`start_state` | The initial condition x0.
`start_time` | The initial time t0.
`stepper` | The stepper to be used for numerical integration.
`system` | Function/Functor defining the rhs of the ODE.
Returns: | The number of steps performed.