pan class="identifier">T</span> <span class="keyword">operator</span> <span class="special">&amp;</span> <span class="special">(</span><span class="keyword">const</span> <span class="identifier">P</span><span class="special">&amp;,</span> <span class="identifier">T</span><span class="special">)</span>         <span class="special">---+--------</span>            <span class="special">---+---------------------------</span>
                                   <span class="identifier">e</span>  <span class="spec