an class="special">{</span>
  <span class="keyword">namespace</span> <span class="identifier">numeric</span> <span class="special">{</span>
    <span class="keyword">namespace</span> <span class="identifier">odeint</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">typename</