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Date: | 2009-04-07 (07:41) |
From: | David MENTRE <dmentre@l...> |
Subject: | Re: [Caml-list] Subtyping |
Hello, On Tue, Apr 7, 2009 at 07:48, Goswin von Brederlow <goswin-v-b@web.de> wrote: > In the last 2 weeks I've been playing around with lots of different > ways to do the same thing to get a feel for what style suites me > best. If you have improvements or alternative ways of doing the two > things below let me know. Well, if you are learning OCaml, I would advise you to read regular OCaml code, e.g. the standard library. You'll learn The Right OCaml Style(tm). > Lets look another thing going in a similar direction. I want to > have a structure where I can store key value pairs. But just for fun > lets say I want to store values of different types and the key knows > the type of value. In short a heterogeneous associative container: Well, why don't you just do: # type k = Int_k of int | Float_k of int;; type k = Int_k of int | Float_k of int # type v = Int_v of int | Float_v of float;; type v = Int_v of int | Float_v of float # let h = Hashtbl.create 3;; val h : ('_a, '_b) Hashtbl.t = <abstr> # Hashtbl.add h (Int_k 3) (Int_v 4);; - : unit = () # Hashtbl.add h (Float_k 5) (Float_v 0.6);; - : unit = () Yours, d.