f="../function.html" title="Class template function">boost::function</a><span class="special">&lt;</span><span class="identifier">Signature</span><span class="special">&gt;</span><span class="special">,</span> 
         <span class="keyword">typename</span> ExtendedSlotFunction <span class="special">=</span> <a class="link" href="../function.html" title="Class template function">boost::function</a><span class="special">&lt;</span><span class="identifier">R</span> <span class="special">(</span><span class="k