n><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=keyword>this</span><span class=special>&lt;</span><span class=identifier>x</span><span class=special>);}
  </span><span class=keyword>bool </span><span class=keyword>operator</span><span class=special>&lt;=(</span><span class=keyword>const </sp