">template</span><span class="special">&lt;</span><span class="keyword">typename</span> State<span class="special">,</span> <span class="keyword">typename</span> Time<span class="special">&gt;</span> 
    <span class="keyword">void</span> <a class="link" href="checked_observer.html#idp40057440-bb"><span class="keyword">operator</span><span class="special">(</span><span class="special">)</span></a><span class="special">(</span><span class="keyword">const</span> <span class="identifier">State</span> <span cla