</span><span class="identifier">test_observer</span></a><span class="special">(</span><span class="special">)</span><span class="special">;</span>

  <span class="comment">// <a class="link" href="test_observer.html#idp41359504-bb">public member functions</a></span>
  <span class="keyword">virtual</span> <span class="keyword">void</span> <a class="link" href="test_observer.html#idp41360064-bb"><span class="identifier">test_start</span></a><span class="special">(</span><span class="identifier">counter_t</spa