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[Caml-list] how to open types
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Date: 2002-11-04 (08:25)
From: pan deng <onlyclimb@y...>
Subject: [Caml-list] how to open types
I want to use hashtable on my objects which all has a
method get_string:string.
but i can only write the code like these:

module SeqHashType =
  type  t= <get_string:string >
  let equal s1  s2 = (String.uppercase s1#get_string
=String.uppercase  s2#get_string )
  let hash s = Strex.hash s#get_string  
module SeqHashtbl = Hashtbl.Make (SeqHashType)

surely it is not what i want . i have tried 
type t= <get_string:string ; ..>

but i can not complie it , the complier says Unbound
then how to open the type <get_string:string> in the
module SeqHashType ?
or it can not be opened at this situation ?

i am a newbie and a little puzzled at open types. 

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