/span>

      <span class="comment">// integrate_adaptive without an observer. </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">typename</span> State<span class="special">,</span> 
               <span class="keyword">typename</span> Time<span class="special">&gt;</span> 
        <span class="identifier