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## Class template n_step_iterator

boost::numeric::odeint::n_step_iterator — ODE Iterator with constant step size. The value type of this iterator is the state type of the stepper.

## Synopsis

    // In header: <boost/numeric/odeint/iterator/n_step_iterator.hpp>

    template<typename Stepper, typename System, typename State>
    class n_step_iterator {
    public:
      // construct/copy/destruct
      n_step_iterator(Stepper, System, State &, time_type, time_type, size_t);
      n_step_iterator(Stepper, System, State &);
    };

## Description

Implements an iterator representing the solution of an ODE starting from t with n steps and a constant step size dt. After each iteration the iterator dereferences to the state x at the next time t+dt. This iterator can be used with Steppers and DenseOutputSteppers and it always makes use of the all the given steppers capabilities. A for_each over such an iterator range behaves similar to the integrate_n_steps routine.

n_step_iterator is a model of single-pass iterator.

The value type of this iterator is the state type of the stepper. Hence one can only access the state and not the current time.

### Template Parameters

1.     typename Stepper

   The stepper type which should be used during the iteration.

2.     typename System

   The type of the system function (ODE) which should be solved.

3.     typename State

   The state type of the ODE.

### `n_step_iterator` public construct/copy/destruct

1.     n_step_iterator(Stepper stepper, System sys, State & s, time_type t,
                       time_type dt, size_t num_of_steps);

2.     n_step_iterator(Stepper stepper, System sys, State & s);