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Date: | 2004-05-12 (19:12) |
From: | briand@a... |
Subject: | Re: [Caml-list] 'b is unbound |
>>>>> "Damien" == Damien <Damien.Pous@ens-lyon.fr> writes: Damien> On Tue, 11 May 2004 23:31:48 -0700 briand@aracnet.com wrote: >> I'm getting the following error: >> >> method op : >> (float, 'a, 'b) Bigarray.Array2.t -> >> float array -> float array -> unit >> end >> The method op has type >> (float, 'a, 'b) Bigarray.Array2.t -> float array -> float array -> >> unit >> where 'b is unbound >> >> Is 'b really unbound, or is the inferencer simply unable to figure out >> what the type should be ? Damien> polymorphic methods require to be explicitly typed Damien> (this kind of type inference should lead to the one for system F) I'm not intending the method to be polymorphic. op is simply a method which takes a Bigarray.Array2 type as an argument. So it would seem that declaring the argument explicitly should solve the problem. Damien> # class o = object method id: 'a.'a -> 'a = fun x -> x end;; Damien> class o : object method id : 'a -> 'a end Damien> # let o = new o in o#id 5, o#id "toto";; Damien> - : int * string = (5, "toto") Here you are making the argument and return types consistent. I believe that my problem is different. It doesn't help that I don't understand what the problem is... Brian ------------------- To unsubscribe, mail caml-list-request@inria.fr Archives: http://caml.inria.fr Bug reports: http://caml.inria.fr/bin/caml-bugs FAQ: http://caml.inria.fr/FAQ/ Beginner's list: http://groups.yahoo.com/group/ocaml_beginners