ults,</span>
<a name="l00308"></a>00308   <span class="comment">// Neeed to specify -nN option to use this function, where</span>
<a name="l00309"></a>00309   <span class="comment">// N&gt;=2</span>
<a name="l00310"></a>00310   <span class="keyword">virtual</span> <span class="keywordtype">bool</span> next() = 0;
<a name="l00311"></a>00311 
<a name="l00312"></a>00312   <span class="comment">// parse &#39;str&#39; and return result as string</span>
<a name="l00313"></a>00313   <span class="comment">// &#39;s