From: Gordon Henriksen <gordonhenriksen@me.com>
To: caml-list@inria.fr
Subject: Re: [Caml-list] Ocaml type with constraints?
Date: Sun, 21 Sep 2008 18:50:56 -0400 [thread overview]
Message-ID: <D95127C4-7507-4248-BE43-6D3EAD8B905B@me.com> (raw)
In-Reply-To: <f82e818a0809211501x824e457y164c71c9ebc45a1d@mail.gmail.com>
On Sep 21, 2008, at 18:01, Angela Zhu wrote:
> I want to define an OCaml type with constraints. For example:
>
> type item = Item of int * float;;
>
> If here this float type is for price of some item, and I want to
> make sure it is positive. In other words, if x = (xi, xf) of type
> item, I want to enforce, xf must >= 0.
>
> Is there a way to define OCaml type like this?
Private types allow this enforcement, although you must implement the
checks at runtime for the reason previously mentioned.
— Gordon
next prev parent reply other threads:[~2008-09-21 22:51 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-09-21 22:01 Angela Zhu
2008-09-21 22:05 ` [Caml-list] " Andrej Bauer
2008-09-21 23:10 ` Martin Jambon
2008-09-21 22:50 ` Gordon Henriksen [this message]
2008-09-21 23:55 ` Jacques Garrigue
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