mple, the pool allocators use
            two tag classes to ensure that the two different allocator types never
            share the same underlying singleton pool.
          </p>
<p>
            <span class="emphasis"><em>Tag</em></span> is never actually used by <code class="computeroutput"><span class="identifier">singleton_pool</span></code>.
          </p>
<p>
            <span class="emphasis"><em>RequestedSize</em></span> The requested size of memory chunks
            to allocate. This is passed a