From: Jacques Garrigue <garrigue@math.nagoya-u.ac.jp>
To: David Allsopp <dra-news@metastack.com>
Cc: "OCaml List" <caml-list@inria.fr>
Subject: Re: [Caml-list] Anonymous sum types in functors
Date: Mon, 24 Jun 2013 08:15:38 +0900 [thread overview]
Message-ID: <FE6DC106-80C6-4E4B-B8AE-2F97DC90A950@math.nagoya-u.ac.jp> (raw)
In-Reply-To: <001601ce6fe1$a2ea9390$e8bfbab0$@metastack.com>
On 2013/06/23, at 16:16, David Allsopp <dra-news@metastack.com> wrote:
> module FlagSet = Set.Make(struct type t = A | B let compare = compare end)
[doesn't work]
> but I'm wondering:
>
> a) Is there a way to do it where you can end up with type elt = A | B (I think the answer is no?)
Xavier described the official solution.
However, since 3.12 you can also do some trickery.
This is going to be heavier, so this is probably a bad idea, but if you really need it, here it is:
module FlagSet = struct
type elt = A | B
include (Set.Make (struct type t = elt let compare = compare end) : Set.S with type elt := elt)
end
Jacques Garrigue
next prev parent reply other threads:[~2013-06-23 23:15 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-06-23 7:16 David Allsopp
2013-06-23 15:14 ` Xavier Leroy
2013-06-23 23:15 ` Jacques Garrigue [this message]
2013-06-24 9:39 ` David Allsopp
2013-06-24 14:37 ` Kristopher Micinski
2013-06-24 14:41 ` Raphaël Proust
2013-06-24 19:13 ` Kristopher Micinski
2013-06-25 8:39 ` David Allsopp
[not found] <563607038852382852@orange.fr>
2013-06-23 9:48 ` David Allsopp
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