nst_reference</span><span class="special">;</span>
    <span class="keyword">typedef</span> <span class="keyword">typename</span> <span class="identifier">pool</span><span class="special">&lt;</span><span class="identifier">UserAllocator</span><span class="special">&gt;::</span><span class="identifier">size_type</span> <span class="identifier">size_type</span><span class="special">;</span>
    <span class="keyword">typedef</span> <span class="keyword">typename</span> <span class="identifier">pool</span><spa