From: Nicolas Braud-Santoni <nicolas@braud-santoni.eu>
To: Gabriel Scherer <gabriel.scherer@gmail.com>
Cc: David.Teller@ens-lyon.org,
Yitzhak Mandelbaum <yitzhakm@cs.princeton.edu>,
OCaml mailing list <caml-list@inria.fr>
Subject: Re: [Caml-list] optional functions in modules
Date: Fri, 18 May 2012 22:05:29 +0200 [thread overview]
Message-ID: <CA+qp_4o9HF-2DcD+VtY2PVrhWqV9GO2J2P7iQwaHswSzmwtfqQ@mail.gmail.com> (raw)
In-Reply-To: <CAPFanBFm-0aSWtVS8BX2AuFjEFuxEweWQVp9bp7f0pXTE+_P-A@mail.gmail.com>
It's quite different : the exception will be thrown whenever the
function is applied.
However, I can't find how to fix this without loosing polymorphism right now.
2012/5/18 Gabriel Scherer <gabriel.scherer@gmail.com>:
> You can regain that polymorphism at a moderate efficiency cost by eta-expanding:
>
> let mmap2 f = match mmap with | None -> failwith "Nope" | Some x -> x f;;
> val mmap2 : ('a -> 'b) -> 'a list -> 'b list = <fun>
prev parent reply other threads:[~2012-05-18 20:05 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
2012-05-18 16:00 ` Gabriel Scherer
2012-05-18 20:05 ` Nicolas Braud-Santoni [this message]
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