ctures. The resulting object will hold a copy of upstream, but will not own the resource to which upstream points. [ Note: The intention is that calls to upstream-&gt;allocate() will be substantially fewer than calls to this-&gt;allocate() in most cases. - end note The behavior of the pooling mechanism is tuned according to the value of the opts argument.</p>
<p><span class="bold"><strong>Throws</strong></span>: Nothing unless upstream-&gt;allocate() throws. It is unspecified if or under what conditions thi