ifier">const_step_time_iterator</span><span class="special">&lt;</span> <span class="identifier">Stepper</span>
              <span class="special">,</span> <span class="identifier">System</span>
              <span class="special">,</span> <span class="identifier">State</span>
              <span class="special">&gt;</span></code>
            </li>
<li class="listitem">
              <code class="computeroutput"><span class="identifier">value_type</span></code> is <code class="computeroutput"><span class="