an><span class=identifier>employee</span><span class=special>&amp; </span><span class=identifier>x</span><span class=special>)</span><span class=keyword>const</span><span class=special>{</span><span class=keyword>return </span><span class=special>!(</span><span class=identifier>x</span><span class=special>&lt;*</span><span class=keyword>this</span><span class=special>);}

  </span><span class=keyword>struct </span><span class=identifier>comp_id
  </span><span class=special>{
    </span><span class=keyword>b