From: Francois Pottier <francois.pottier@inria.fr>
To: caml-list@inria.fr
Subject: Re: [Caml-list] Function call with a list of parameters
Date: Mon, 17 Dec 2001 08:40:04 +0100 [thread overview]
Message-ID: <20011217084004.A4939@pauillac.inria.fr> (raw)
In-Reply-To: <Pine.GSO.4.33.0112141419230.25856-100000@clipper.ens.fr>; from frisch@clipper.ens.fr on Fri, Dec 14, 2001 at 02:26:38PM +0100
Hello,
Alain Frisch wrote:
> Cyclic (aka recursive) types are necessary to type such an expression:
> # fun x -> x # run (); x;;
> - : (< run : unit -> 'b; .. > as 'a) -> 'a = <fun>
This is slightly misleading. Such a type is really non-recursive, since
it is an abbreviation for the following:
< run : unit -> 'b; 'c > -> < run : unit -> 'b; 'c >
The notation (t as 'a) allows sharing relationships to appear explicitly
in print, yielding shorter and more readable types. It actually describes
a recursive type only when 'a occurs within t, which is not the case in
the example above. It happens e.g. when x is passed as a parameter to
one of its own methods:
# fun x -> x#compare(x);;
- : (< compare : 'a -> 'b; .. > as 'a) -> 'b = <fun>
--
François Pottier
Francois.Pottier@inria.fr
http://pauillac.inria.fr/~fpottier/
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next prev parent reply other threads:[~2001-12-17 7:40 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2001-12-11 16:31 Vincent Barichard <Vincent Barichard
2001-12-11 22:59 ` Chris Hecker
2001-12-11 23:26 ` Bruce Hoult
2001-12-12 9:35 ` Markus Mottl
2001-12-12 10:20 ` Vincent Barichard <Vincent Barichard
2001-12-12 22:31 ` Diego Olivier Fernandez Pons
2001-12-13 0:20 ` Bruno Pagano
2001-12-13 0:17 ` Diego Olivier Fernandez Pons
2001-12-14 13:26 ` Alain Frisch
2001-12-17 7:40 ` Francois Pottier [this message]
2001-12-12 13:52 ` Francois Pottier
2001-12-12 18:54 ` Chris Hecker
2001-12-12 19:04 ` Patrick M Doane
2001-12-12 23:49 ` Bruce Hoult
2001-12-13 7:41 ` Francois Pottier
2001-12-12 9:31 ` Jim Farrand
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