From: Dan Grossman <djg@cs.washington.edu>
To: Serge <serge@shade.msu.ru>
Cc: caml-list@inria.fr
Subject: Re: [Caml-list] Constructors as functions and tuples in constructors
Date: Wed, 08 Oct 2003 09:07:36 -0700 [thread overview]
Message-ID: <3F843648.3030200@cs.washington.edu> (raw)
In-Reply-To: <Pine.LNX.4.10.10310081945020.22773-100000@shade.msu.ru>
Serge wrote:
> First, it would be nice to have constructors as functions like below:
>
> List. map Some [17]
Leads to strange error messages and is trivially circumventable (replace
Some with fun x -> Some x)
> Second, it would also be nice not to have "the concept of constructor
> arity", and treat the code below as correct:
>
> type t = A of int * int
> let _ =
> match A (17, 0) with
> A z -> match z with (x, y) -> ()
Works with type t = A of (int * int). You put the parens in. So the
choice is yours. The advantage of leaving them out is usually performance.
Others can give the long version of these answers...
--Dan
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next prev parent reply other threads:[~2003-10-08 16:07 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-10-08 15:57 Serge
2003-10-08 16:07 ` Dan Grossman [this message]
2003-10-08 16:33 ` Andreas Rossberg
2003-10-08 17:05 ` Dan Grossman
2003-10-09 12:40 ` Andreas Rossberg
2003-10-08 18:28 ` Alain.Frisch
2003-10-08 18:44 ` Marcin 'Qrczak' Kowalczyk
2003-10-08 16:13 ` Michal Moskal
2003-10-08 16:25 ` Nicolas Cannasse
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