<?xml version="1.0" encoding="ISO-8859-1"?>

<!DOCTYPE message PUBLIC
  "-//MLarc//DTD MLarc output files//EN"
  "../../mlarc.dtd"[
  <!ATTLIST message
    listname CDATA #REQUIRED
    title CDATA #REQUIRED
  >
]>

  <?xml-stylesheet href="../../mlarc.xsl" type="text/xsl"?>


<message 
  url="2009/01/8291b0da375a697d829347a7a18148e7"
  from="Hugo Ferreira &lt;hmf@i...&gt;"
  author="Hugo Ferreira"
  date="2009-01-20T11:46:45"
  subject="Re: [Caml-list] Making a polymorphic type non-polymorphic to	comply with original signature"
  prev="2009/01/3faf1d84d33d7d63e5f417f0853743b6"
  next="2009/01/da6cc2637b564bfd93a0b72007d53fe0"
  prev-in-thread="2009/01/45ebef4fa64ce8ca6d0ab81460203417"
  next-in-thread="2009/01/da6cc2637b564bfd93a0b72007d53fe0"
  prev-thread="2009/01/6cfb5e559cd4bf982c4960d25352bc27"
  next-thread="2009/01/bdd60304d962e4e9ac5f3fc4516fce06"
  root="../../"
  period="month"
  listname="caml-list"
  title="Archives of the Caml mailing list">

<thread subject="Making a polymorphic type non-polymorphic to comply with original signature ">
<msg 
  url="2009/01/5086d82bd654331abd6d66fbfc5877f2"
  from="Hugo Ferreira &lt;hmf@i...&gt;"
  author="Hugo Ferreira"
  date="2009-01-20T10:59:50"
  subject="Making a polymorphic type non-polymorphic to comply with original signature ">
<msg 
  url="2009/01/03af28a51b1f263e4bce45395c2a24ee"
  from="Daniel_Bünzli &lt;daniel.buenzli@e...&gt;"
  author="Daniel_Bünzli"
  date="2009-01-20T11:25:04"
  subject="Re: [Caml-list] Making a polymorphic type non-polymorphic to comply with original signature">
<msg 
  url="2009/01/45ebef4fa64ce8ca6d0ab81460203417"
  from="David Teller &lt;David.Teller@u...&gt;"
  author="David Teller"
  date="2009-01-20T11:37:28"
  subject="Re: [Caml-list] Making a polymorphic type non-polymorphic to comply with original signature">
<msg 
  url="2009/01/8291b0da375a697d829347a7a18148e7"
  from="Hugo Ferreira &lt;hmf@i...&gt;"
  author="Hugo Ferreira"
  date="2009-01-20T11:46:45"
  subject="Re: [Caml-list] Making a polymorphic type non-polymorphic to	comply with original signature">
<msg 
  url="2009/01/da6cc2637b564bfd93a0b72007d53fe0"
  from="Thomas Gazagnaire &lt;ocaml@g...&gt;"
  author="Thomas Gazagnaire"
  date="2009-01-20T12:58:33"
  subject="Re: [Caml-list] Making a polymorphic type non-polymorphic to comply  with original signature">
<msg 
  url="2009/01/eb1bb346ea9ac86f67b1c2011a41bdc8"
  from="Hugo Ferreira &lt;hmf@i...&gt;"
  author="Hugo Ferreira"
  date="2009-01-20T13:25:52"
  subject="Re: [Caml-list] Making a polymorphic type non-polymorphic to comply with original signature">
</msg>
</msg>
</msg>
</msg>
<msg 
  url="2009/01/3faf1d84d33d7d63e5f417f0853743b6"
  from="Hugo Ferreira &lt;hmf@i...&gt;"
  author="Hugo Ferreira"
  date="2009-01-20T11:43:13"
  subject="Re: [Caml-list] Making a polymorphic type non-polymorphic to comply with original signature">
</msg>
</msg>
<msg 
  url="2009/01/13994d2261e2703a410b2818687311b2"
  from="Martin Jambon &lt;martin.jambon@e...&gt;"
  author="Martin Jambon"
  date="2009-01-20T15:02:35"
  subject="Re: [Caml-list] Making a polymorphic type non-polymorphic to comply with original signature">
<msg 
  url="2009/01/bec8514bf8ec8e4b7403d82c8845ffa0"
  from="Hugo Ferreira &lt;hmf@i...&gt;"
  author="Hugo Ferreira"
  date="2009-01-20T17:05:16"
  subject="Re: [Caml-list] Making a polymorphic type non-polymorphic to comply with original signature">
</msg>
</msg>
</msg>
</thread>

<contents>
David Teller wrote:
&gt; It's probably feasible without copy &amp; paste by building a functor on top
&gt; of the defunctorized hashtable in Batteries. Or by just using the
&gt; defunctorized hashtable of Batteries directly, although it's not as safe
&gt; as the functorized version, due to the absence of existential types.
&gt; 

If I understand you correctly I would have to redefine equivalents for:
- HashedType
- S
- Make(H: HashedType)

Basically copy &amp; paste these and change the type.
Doable although not to my liking.

TIA,
Hugo F.


&gt; Cheers,
&gt;  David
&gt; 
&gt; On Tue, 2009-01-20 at 12:24 +0100, Daniel BÃ¼nzli wrote:
&gt;&gt; Le 20 janv. 09 Ã  11:59, Hugo Ferreira a Ã©crit :
&gt;&gt;
&gt;&gt;&gt; Is it possible to make H comply with Hashtbl.HashedType i.e: make
&gt;&gt;&gt; J.Key = 'a H.node ?
&gt;&gt; This issue is well known (e.g. see here [1]). Your are running into  
&gt;&gt; limitations of the standard library. The only unsatisfying answer is  
&gt;&gt; to copy the code from the standard library and add the parameter  
&gt;&gt; yourself.
&gt;&gt;
&gt;&gt; Best,
&gt;&gt;
&gt;&gt; Daniel
&gt;&gt;
&gt;&gt; [1] http://groups.google.com/group/fa.caml/browse_thread/thread/f2acb593da91553c?hl=fr&amp;ie=UTF-8&amp;q=type+var+in+functor+fa.caml
&gt;&gt;
&gt;&gt; ____________________________________________ugs
&gt;&gt;

</contents>

</message>

