ts for a class derived from <code class="computeroutput"><code class="computeroutput"><a class="link" href="memory_resource.html" title="Class memory_resource">memory_resource</a></code></code>.</p>
<p><span class="bold"><strong>Effects</strong></span>: If the pool selected for a block of size bytes is unable to satisfy the memory request from its own internal data structures, it will call <code class="computeroutput">upstream_resource()-&gt;allocate()</code> to obtain more memory. If <code class="computero