fier">Compare</span><span class="special">,</span> <span class="identifier">Combine</span><span class="special">,</span> <span class="identifier">Section</span><span class="special">,</span> <span class="identifier">Alloc</span> <span class="special">&gt;</span> <span class="special">&amp;</span> 
  <a name="idp41757728-bb"></a><span class="identifier">_add</span><span class="special">(</span><span class="keyword">const</span> <span class="identifier">element_type</span> <span class="special">&amp;</span> a