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[Caml-list] Polymorphic methods in class objects
- Narayanan Krishnamurthy
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Date: | 2002-08-20 (20:43) |
From: | Narayanan Krishnamurthy <Narayanan.Krishnamurthy@m...> |
Subject: | [Caml-list] Polymorphic methods in class objects |
Hi, This is probably a very naive question, but I'm going to ask it anyways. I was trying to define a polymorphic method 'foo' as shown in the class below, but have not been able to compile it in Ocaml because of type unification problems. I'm not sure why this is not possible, since the compiler should be able to build a variant type automatically as the value of the expression 'foo'. Is there a fundamental reason or is it because it is against the principle of strong typing. Other than defining variant types to deal with this, is there any other solution? Any help would be greatly appreciated. Thanx. (*********************************************) class polym = object(self) val i = 0 method private func1 j = j + 1 method private func2 j = string_of_int j method private func3 j = float_of_int j method private foo polymf n = polymf n method goo () = self#foo self#func1 2 method hoo () = self#foo self#func2 2 method boo () = self#foo self#func3 2 end (* I would like to do the following *) let m = new polym polym#goo () returns 3 polym#hoo () returns "2" polym#boo () returns "2.0" (****************************************************) -- ************************************************************************** Narayanan Krishnamurthy (Nari) ASP Advanced Tools and Methodology Motorola SPS Architecture and Systems Platforms Motorola Inc. Semiconductor Products Sector 7700 W. Parmer Lane, Austin, TX 78729 Loc/MD: TX32/PL30 _ email : nari@ibmoto.com / \ email: Narayanan.Krishnamurthy@motorola.com Ph : (512) 996-4863 |O O| Fax : (512) 996-7432 ************************| I |********************************************* \ o / --- ------------------- 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