class="computeroutput"><span class="identifier">const_step_iterator</span></code>,
          <code class="computeroutput"><span class="identifier">adaptive_step_iterator</span></code>,
          <code class="computeroutput"><span class="identifier">n_step_iterator</span></code> and <code class="computeroutput"><span class="identifier">times_iterator</span></code> -- each of them in two
          versions: either with only the <code class="computeroutput"><span class="identifier">state</span></code>
        