From: Xavier Leroy <xavier.leroy@inria.fr>
To: brogoff@speakeasy.net
Cc: "A. Ozmen" <aoz@dmailman.com>, "caml-list@inria.fr" <caml-list@inria.fr>
Subject: Re: [Caml-list] record declaration, SML
Date: Fri, 10 Jan 2003 10:21:11 +0100 [thread overview]
Message-ID: <20030110102111.A21055@pauillac.inria.fr> (raw)
In-Reply-To: <Pine.LNX.4.44.0301091013420.5662-100000@grace.speakeasy.net>; from brogoff@speakeasy.net on Thu, Jan 09, 2003 at 10:27:57AM -0800
> > What's best translation of the following SML type?
> > datatype t = C of { f : int }
> In the case of records in a module sharing field names, well, you can't do
> that either, so you'll need to use classes or find some way to disambiguate
> the fields.
Sometimes, it's acceptable to just omit the record type:
type t = C of int
You lose the naming of the arguments of the constructor, but for small
numbers of arguments (e.g. 1 or 2), this is often tolerable.
> There are a few other conveniences in SML record handling too, like the ...
> notation, that don't exist in OCaml.
You mean, in pattern-matching over records? Caml offers the same
functionality without the ... notation, e.g.
type r = { x: int; y: int }
match r with { x = 1 } -> ...
Because records are declared in advance, there is no requirement that
all record labels be mentioned in a pattern matching.
- Xavier Leroy
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next prev parent reply other threads:[~2003-01-10 9:21 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-01-09 13:56 A. Ozmen
2003-01-09 18:27 ` brogoff
2003-01-09 23:15 ` A. Ozmen
2003-01-10 9:21 ` Xavier Leroy [this message]
2003-01-10 14:34 ` brogoff
2003-01-09 22:42 ` Daniel de Rauglaudre
2003-01-09 23:14 ` Alessandro Baretta
2003-01-10 2:59 ` Daniel de Rauglaudre
2003-01-10 3:45 ` brogoff
2003-01-10 7:45 ` Alessandro Baretta
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