identifier">Section</span><span class="special">,</span> <span class="identifier">Alloc</span> <span class="special">&gt;</span><span class="special">::</span><span class="identifier">iterator</span> 
  <a name="id673491-bb"></a><span class="identifier">_add</span><span class="special">(</span><span class="identifier">iterator</span> prior_<span class="special">,</span> <span class="keyword">const</span> <span class="identifier">value_type</span> <span class="special">&amp;</span> addend<span class="special