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<pre class="literallayout"><span class="keyword">typename</span> Signature</pre>
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<li class="listitem"><pre class="literallayout"><span class="keyword">typename</span> Combiner <span class="special">=</span> <a class="link" href="optional_last_value.html" title="Class template optional_last_value">boost::signals2::optional_last_value</a><span class="special">&lt;</span><span class="identifier">R</span><span class="special">&gt;</s