"keyword">const</span> <span class="identifier">element_type</span> <span class="special">&amp;</span> value_pair<span class="special">)</span><span class="special">;</span></pre></li>
<li class="listitem"><pre class="literallayout"><span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> Combiner<span class="special">&gt;</span> 
  <span class="identifier">iterator</span> <a name="idp41782592-bb"></a><span class="identifier">_add</span><span class="special