From: David Rajchenbach-Teller <David.Teller@ens-lyon.org>
To: Yitzhak Mandelbaum <yitzhakm@CS.Princeton.EDU>
Cc: OCaml mailing list <caml-list@inria.fr>
Subject: Re: [Caml-list] optional functions in modules
Date: Fri, 18 May 2012 17:24:36 +0200 [thread overview]
Message-ID: <4FB669B4.6000200@ens-lyon.org> (raw)
In-Reply-To: <BC84E0A3-D1C6-4258-BAAF-2911B119781A@cs.princeton.edu>
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On 5/17/12 7:43 PM, Yitzhak Mandelbaum wrote:
> Thanks to everyone who responded. FWIW, I found the argument in favor of options most compelling as a general approach.
>
> Yitzhak
>
Note that there is a drawback to that approach: loss of polymorphism.
# let mmap = Some List.map;;
val mmap : (('a -> 'b) -> 'a list -> 'b list) option = Some <fun>
# let mmap2 = match mmap with | None -> failwith "Nope" | Some x -> x;;
val mmap2 : ('_a -> '_b) -> '_a list -> '_b list = <fun>
I suspect that first-class modules can help here, but I have not really
had time to toy with them yet.
Cheers,
David
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next prev parent reply other threads:[~2012-05-18 15:25 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-05-10 12:22 Yitzhak Mandelbaum
2012-05-10 14:13 ` "Markus W. Weißmann"
2012-05-10 14:53 ` Fabrice Le Fessant
2012-05-10 14:59 ` David Rajchenbach-Teller
2012-05-10 18:44 ` Goswin von Brederlow
2012-05-11 0:55 ` Yaron Minsky
2012-05-17 17:43 ` Yitzhak Mandelbaum
2012-05-18 15:24 ` David Rajchenbach-Teller [this message]
2012-05-18 16:00 ` Gabriel Scherer
2012-05-18 20:05 ` Nicolas Braud-Santoni
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