<span class="lineno">   49</span><span class="comment"> *</span></div>
<div class="line"><a id="l00050" name="l00050"></a><span class="lineno">   50</span><span class="comment"> * @tparam Arena</span></div>
<div class="line"><a id="l00051" name="l00051"></a><span class="lineno">   51</span><span class="comment"> *         SHM arena type that has method of the form `shared_ptr&lt;T&gt; construct&lt;T&gt;(...)`.</span></div>
<div class="line"><a id="l00052" name="l00052"></a><span class="lineno">   52</span><