From: Jon Harrop <jon@jdh30.plus.com>
To: caml-list@yquem.inria.fr
Subject: Re: [Caml-list] Objective Caml release 3.08.2
Date: Thu, 25 Nov 2004 21:47:30 +0000 [thread overview]
Message-ID: <200411252147.31167.jon@jdh30.plus.com> (raw)
In-Reply-To: <008001c4d319$693f0f40$b18780d9@mshome.net>
On Thursday 25 November 2004 18:05, Frédéric Gava wrote:
> > > Why an order for the fold operator ?
> > Because Set.t is an ordered container,
>
> Ok, but it is an abstract type : you do not know (except when you used
> ocamlbrowser) how it works...
The ability to fold over the elements of a set in order can be very useful.
Consequently, when implementing a set data structure, the mathematical notion
of a set is often supplemented with the added assurances that many functions
over the set will operate in-order. This is typically achieved by
implementing the set as a red-black balanced binary tree.
Other useful set implementations which do not present elements in-order are
possible, most notably a hashed set because it has significantly better
average-case performance.
Cheers,
Jon.
next prev parent reply other threads:[~2004-11-25 21:44 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-11-24 13:06 Damien Doligez
2004-11-25 14:47 ` [Caml-list] " Frédéric Gava
2004-11-25 15:53 ` skaller
2004-11-25 18:05 ` Frédéric Gava
2004-11-25 18:32 ` Christophe TROESTLER
2004-11-26 23:10 ` Frédéric Gava
2004-11-25 21:47 ` Jon Harrop [this message]
2004-11-25 23:34 ` skaller
2004-11-26 8:45 ` Frédéric Gava
2004-11-26 1:20 ` Aleksey Nogin
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