From: Jacques GARRIGUE <garrigue@kurims.kyoto-u.ac.jp>
To: caml-list@pauillac.inria.fr
Subject: Re: Map is not tail recursive
Date: Wed, 13 Jan 1999 17:47:08 +0900 [thread overview]
Message-ID: <19990113174708X.garrigue@kurims.kyoto-u.ac.jp> (raw)
In-Reply-To: Your message of "Mon, 11 Jan 1999 11:51:25 -0700" <001101be3d93$66516610$210148bf@dylan>
From: "David McClain" <dmcclain@azstarnet.com>
> Juan got me thinking about this problem... So here is a solution:
>
> external rplacd : 'a list -> 'a list -> unit = "rplacd"
>
> -- and the external C code is
>
> value rplacd(value cell, value item)
> {
> Store_field(cell,1,item);
> return Val_unit;
> }
While this is undocumented, there is a slightly simpler way to define
rplacd, wihout using C. This should be faster in most cases
(particularly if you inline it).
let rplacd (cell : 'a list) (item : 'a) =
Obj.set_field (Obj.repr cell) 1 (Obj.repr item)
As for using the null pointer to have more efficient representations
in data-structures, this is theoretically possible (and I believe that
Xavier Leroy had an implementation with it), but this is not in the
current version of ocaml.
Jacques
---------------------------------------------------------------------------
Jacques Garrigue Kyoto University garrigue at kurims.kyoto-u.ac.jp
<A HREF=http://wwwfun.kurims.kyoto-u.ac.jp/~garrigue/>JG</A>
next prev parent reply other threads:[~1999-01-13 11:24 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
1999-01-11 18:51 David McClain
1999-01-13 8:47 ` Jacques GARRIGUE [this message]
-- strict thread matches above, loose matches on Subject: below --
1999-01-14 3:49 David McClain
1999-01-13 17:40 Marc Rouaix
1999-01-12 12:06 Marc Rouaix
1999-01-10 10:49 Juan Jose Garcia Ripoll
1999-01-11 11:03 ` Xavier Leroy
1999-01-12 11:49 ` William Chesters
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