d">template</span> <span class="special">&lt;</span><span class="keyword">typename</span> <span class="identifier">U</span><span class="special">&gt;</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">&lt;</span><span class="identifier">U</span><span class="special">,</span> <span class="identifier">UserAllocator</span><span class="special">&gt;</span> <span class="speci