uffer_helper( std::size_t width</div><div class="line"><a name="l00035"></a><span class="lineno">   35</span>&#160;                     , <span class="keywordtype">bool</span></div><div class="line"><a name="l00036"></a><span class="lineno">   36</span>&#160;                     )</div><div class="line"><a name="l00037"></a><span class="lineno">   37</span>&#160;    : _row_buffer( width )</div><div class="line"><a name="l00038"></a><span class="lineno">   38</span>&#160;    {}</div><div class="line"><a name