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 =
struct 
  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  
end
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. 

Best regards
            
              Yours
                         climb
                         onlyclimb@163.com
                         2002-11-03

 



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