From: Frank Atanassow <franka@cs.uu.nl>
To: Costin Stefan <costins@auctionwatch.ro>
Cc: caml-list@inria.fr
Subject: Re: [Caml-list] list in functional style
Date: Tue, 7 Aug 2001 14:42:28 +0200 [thread overview]
Message-ID: <20010807144228.C26097@cs.uu.nl> (raw)
In-Reply-To: <3B6FB7E3.8FD8903@auctionwatch.ro>; from costins@auctionwatch.ro on Tue, Aug 07, 2001 at 12:41:55PM +0300
Costin Stefan wrote (on 07-08-01 12:41 +0300):
> I have the following problem : want to define lists but using only
> functions :
Sorry, I was not reading very carefully and now recognize that my post was a
complete non-answer.
> So why the type of the result of hd may be the same of the type of the
> result of tl !
>
> Why the type of the result of a cons isn't a polymorphic function ?
Type variables of the form '_a are not generalized; they can be instantiated
only once. This is a conservative criterion to ML-like languages use to handle
the interaction between polymorphism and imperative side-effects.
You can read about it in the FAQ:
http://caml.inria.fr/FAQ/FAQ_EXPERT-eng.html#variables_de_types_faibles
--
Frank Atanassow, Information & Computing Sciences, Utrecht University
Padualaan 14, PO Box 80.089, 3508 TB Utrecht, Netherlands
Tel +31 (030) 253-3261 Fax +31 (030) 251-379
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prev parent reply other threads:[~2001-08-07 12:42 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2001-08-07 9:41 Costin Stefan
2001-08-07 12:23 ` Frank Atanassow
2001-08-07 12:42 ` Frank Atanassow [this message]
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