From: "David Allsopp" <dra-news@metastack.com>
To: "OCaml List" <caml-list@yquem.inria.fr>
Subject: Private types
Date: Thu, 30 Oct 2008 21:18:31 +0100 [thread overview]
Message-ID: <340C8DB35D244173AE527238DB359A19@countertenor> (raw)
I'm trying to play with the new private type abbreviations in OCaml
3.11+beta1
If I write:
module type S =
sig
type t = private int
val create : int -> t
end;;
module M : S =
struct
type t = int
let create x = x
end;;
let x = M.create 0;;
Shouldn't I now be able to say:
string_of_int x;;
But I get a type error... I'm struggling to see what difference the private
declaration has made, therefore.
I thought that the point of private types was that you could deconstruct
them... so values of type M.t are valid wherever an int is used but not the
converse.
Or have I missed something? <prepares to be embarrassed...>
David
next reply other threads:[~2008-10-30 20:18 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-10-30 20:18 David Allsopp [this message]
2008-10-30 20:33 ` [Caml-list] " Daniel Bünzli
2008-10-30 21:54 ` David Allsopp
2008-10-31 0:08 ` Jacques Garrigue
2008-10-31 14:05 ` Dario Teixeira
2008-11-01 9:52 ` Jacques Garrigue
2008-11-01 1:52 ` Edgar Friendly
2008-11-01 8:19 ` David Allsopp
2008-11-01 19:31 ` Edgar Friendly
2008-11-01 20:18 ` David Allsopp
2008-11-02 14:53 ` Edgar Friendly
2008-11-01 10:00 ` Jacques Garrigue
2008-11-01 19:41 ` Edgar Friendly
2008-11-01 13:01 ` Rémi Vanicat
2008-11-01 13:30 ` [Caml-list] " Edgar Friendly
2008-10-30 21:47 ` [Caml-list] " Jérémie Dimino
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