how to open the type
- 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.