pan>    <span class="keywordflow">if</span>(!(m_extent == Extent3D::Zero()))</div>
<div class="line"><a id="l00590" name="l00590"></a><span class="lineno">  590</span>    {</div>
<div class="line"><a id="l00591" name="l00591"></a><span class="lineno">  591</span>        <span class="comment">// alloc new buffer</span></div>
<div class="line"><a id="l00592" name="l00592"></a><span class="lineno">  592</span>        new_buffer = reserve_3d&lt;T&gt;(stream, m_extent);</div>
<div class="line"><a id="l00593" nam