lass="line"><a id="l00039" name="l00039"></a><span class="lineno">   39</span><span class="comment"> * Alias that, given an `Arena` type (with `Arena::construct&lt;T&gt;()` which allocates/constructs a `T`), yields a</span></div>
<div class="line"><a id="l00040" name="l00040"></a><span class="lineno">   40</span><span class="comment"> * `Shm_session` type over which one can `Shm_session::lend_object&lt;T&gt;()` so-constructed objects.</span></div>
<div class="line"><a id="l00041" name="l00041"></a><span cla