</span>
<span class="keyword">void</span> <span class="identifier">register_observer</span><span class="special">(</span><a class="link" href="../test_observer.html" title="Class test_observer">test_observer</a> <span class="special">&</span> to<span class="special">)</span><span class="special">;</span></pre></div>
<div class="refsect1">
-<a name="idp117085200"></a><h2>Description</h2>
+<a name="idp128093360"></a><h2>Description</h2>
<p>
</p>
<div class="variablelist"><table border="0" class="variablelist compact">