ass="special">&amp;</span><span class="special">,</span> reference_wrapper<span class="special">&lt;</span><span class="identifier">Functor</span><span class="special">&gt;</span><span class="special">)</span><span class="special">;</span>
  <span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> Signature<span class="special">,</span> <span class="keyword">typename</span> Functor<span class="special">&gt;</span> 
    <span class="keyword">bool</span> <a c