pan> <span class="special">};</span>

  <span class="keyword">public</span><span class="special">:</span>
    <span class="identifier">pool_allocator</span><span class="special">();</span>
    <span class="identifier">pool_allocator</span><span class="special">(</span><span class="keyword">const</span> <span class="identifier">pool_allocator</span> <span class="special">&amp;);</span>
    <span class="comment">// The following is not explicit, mimicking std::allocator [20.4.1]</span>
    <span class="keywor