pan class="identifier">equal_range</span><span class="special">(</span><span class="keyword">const</span> <span class="identifier">key_type</span> <span class="special">&amp;</span> x<span class="special">)</span><span class="special">;</span></pre></li>
<li class="listitem">
<pre class="literallayout"><span class="identifier">std</span><span class="special">::</span><span class="identifier">pair</span><span class="special">&lt;</span> <span class="identifier">const_iterator</span><span class="special">,</s