5"></a>00215   <span class="comment">// return answer tag-id of i-th token if it is available</span>
<a name="l00216"></a>00216   <span class="keyword">virtual</span> <span class="keywordtype">size_t</span> answer(<span class="keywordtype">size_t</span> i) <span class="keyword">const</span> = 0;
<a name="l00217"></a>00217 
<a name="l00218"></a>00218   <span class="comment">// alias of result(i)</span>
<a name="l00219"></a>00219   <span class="keyword">virtual</span> <span class="keywordtype">size_t</span> y