From: Noel Welsh <noelwelsh@yahoo.com>
To: Brian Hurt <brian.hurt@qlogic.com>
Cc: caml-list <caml-list@inria.fr>
Subject: Re: [Caml-list] Probably FAQ: Why is list-append (list :: elem) so expensive?
Date: Wed, 25 Sep 2002 08:39:18 -0700 (PDT) [thread overview]
Message-ID: <20020925153918.52238.qmail@web11205.mail.yahoo.com> (raw)
In-Reply-To: <Pine.LNX.4.33.0209250958520.1974-100000@eagle.ancor.com>
O'Caml's heritage is from the functional world, so
side-effects are discouraged. Maintaining a tail
pointer requires side-effects.
For more insight consider that a list is defined by
its recursive definition:
List 'a := Cons 'a * List
| Null
A list is a cons cell containing an element and the
rest of the list, or null, which terminates the list.
Now tell me which cons cell is the head, and so should
maintain the tail pointer. Welcome to a world of pain!
HTH,
Noel
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next prev parent reply other threads:[~2002-09-25 15:39 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-09-25 15:33 Brian Hurt
2002-09-25 15:39 ` Noel Welsh [this message]
2002-09-25 15:42 ` Oleg
2002-09-25 16:17 ` Markus Mottl
2002-09-25 18:44 ` Brian Hurt
2002-09-25 19:22 ` Markus Mottl
2002-09-26 7:10 ` Florian Hars
2002-09-26 14:44 ` Kontra, Gergely
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