Yes you are right, I should have put a warning.&nbsp; These modules are for peculiar cases.<br>So here it is:<br><br>WARNING:&nbsp; The default comparison function is not sound for non-canonical datastructures such<br>as Sets and Maps.&nbsp; Xset is not canonical.&nbsp; Do not use Xsets or Xmap without providing the correct<br>
comparison function.&nbsp; You must always pass the same comparison function.<br><br>(That&#39;s why I was asking if there was a Set/Map structure with canonical representation the other day.)<br><br>Extlib provides a version where the comparison function for the keys is stored in the map.<br>
But I chose to not do this for some peculiar reasons.<br>&nbsp; - I&#39;m serializing Xmap and Xsets using Marshal, and I don&#39;t want to have functions in the structure<br>&nbsp; - I don&#39;t like the overhead of a wrapper structure and I don&#39;t want to complicate the API<br>
-- <br>Berke Durak<br><div class="gmail_quote"><br></div><br>