</span><span class="special">;</span>
   <span class="comment">//A list holding still undefined 'data'</span>
   <span class="identifier">list</span><span class="special">&lt;</span><span class="identifier">data</span><span class="special">&gt;</span>        <span class="identifier">l_</span><span class="special">;</span>
   <span class="comment">//A map holding still undefined 'data'</span>
   <span class="identifier">map</span><span class="special">&lt;</span><span class="identifier">data</span><span clas