entifier">Visitor</span><span class="special">&gt;</span> <span class="identifier">apply_visitor</span><span class="special">(</span><span class="identifier">Visitor</span> <span class="special">&amp;</span> visitor<span class="special">)</span><span class="special">;</span>
<span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> Visitor<span class="special">&gt;</span> 
  <a class="link" href="apply_visit_1_3_46_5_7_1_2.html" title="Class template apply_v