ord">const</span> <span class="identifier">pool</span> <span class="special">&amp;);</span>

  <span class="keyword">public</span><span class="special">:</span>
    <span class="keyword">typedef</span> <span class="identifier">UserAllocator</span> <span class="identifier">user_allocator</span><span class="special">;</span>
    <span class="keyword">typedef</span> <span class="keyword">typename</span> <span class="identifier">UserAllocator</span><span class="special">::</span><span class="identifier">size_ty