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>
[-- Attachment #1: Type: text/plain, Size: 623 bytes --]
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
[-- Attachment #2: OpenPGP digital signature --]
[-- Type: application/pgp-signature, Size: 487 bytes --]
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
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=4FB669B4.6000200@ens-lyon.org \
--to=david.teller@ens-lyon.org \
--cc=caml-list@inria.fr \
--cc=yitzhakm@CS.Princeton.EDU \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox