From: "Stefan Monnier" <monnier+lists/caml/news/@RUM.cs.yale.edu>
To: caml-list@inria.fr
Subject: Re: Data structure efficiency questions
Date: 19 Sep 2000 15:07:19 -0500 [thread overview]
Message-ID: <39c7b967@tequila.cs.yale.edu> (raw)
In-Reply-To: <14791.6318.709323.906054@pc803>
>>>>> "Jean-Christophe" == Jean-Christophe Filliatre <Jean-Christophe.Filliatre@lri.fr> writes:
> In his message of September 18, 2000, David=?iso-8859-1?Q?_Mentr=E9?= writes:
>> 1. Is the @ operator costly or is it implemented as a simple pointers
>> manipulation?
I'm not sure what you mean by "not costly" since the "pointer manipulation"
still requires to go down one of the lists.
> @ cannot be implemented as a simple pointer manipulation, because
> lists are persistent data structures. It means that l1 and l2 must
> remain the same lists after the evaluation of l1 @ l2.
You could of course have a list datatype as (pardon the SML syntax):
datatype 'a list = Nil | Cons of 'a * 'a list | @ of 'a list * 'a list
Although this probably wouldn't be described as "pointer manipulation".
Stefan
prev parent reply other threads:[~2000-09-20 19:50 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2000-09-18 15:19 David Mentré
2000-09-19 7:41 ` Jean-Christophe Filliatre
2000-09-19 20:07 ` Stefan Monnier [this message]
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