lass="identifier">Stepper</span><span class="special">,</span> <span class="identifier">System</span><span class="special">,</span> <span class="identifier">State</span> <span class="special">&amp;</span><span class="special">)</span><span class="special">;</span>
      <span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> Stepper<span class="special">,</span> <span class="keyword">typename</span> System<span class="special">,</span> <span class="keyword