From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.1.3 (2006-06-01) on yquem.inria.fr X-Spam-Level: X-Spam-Status: No, score=0.2 required=5.0 tests=AWL autolearn=disabled version=3.1.3 X-Original-To: caml-list@yquem.inria.fr Delivered-To: caml-list@yquem.inria.fr Received: from mail2-relais-roc.national.inria.fr (mail2-relais-roc.national.inria.fr [192.134.164.83]) by yquem.inria.fr (Postfix) with ESMTP id E4344BBCA for ; Sat, 26 Apr 2008 09:36:18 +0200 (CEST) X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: AqABALZ4EkiBrw8EiGdsb2JhbACRWwEBAQ8gmSA X-IronPort-AV: E=Sophos;i="4.25,710,1199660400"; d="scan'208";a="10088494" Received: from ext.lri.fr ([129.175.15.4]) by mail2-smtp-roc.national.inria.fr with ESMTP; 26 Apr 2008 09:36:18 +0200 Received: from localhost (localhost [127.0.0.1]) by ext.lri.fr (Postfix) with ESMTP id C2AC2A472B; Sat, 26 Apr 2008 09:36:18 +0200 (CEST) X-Virus-Scanned: Debian amavisd-new at lri.fr Received: from ext.lri.fr ([127.0.0.1]) by localhost (ext.lri.fr [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id r-Ppt7yaWY-A; Sat, 26 Apr 2008 09:36:18 +0200 (CEST) Received: from [82.64.141.196] (lns-bzn-24-82-64-141-196.adsl.proxad.net [82.64.141.196]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by ext.lri.fr (Postfix) with ESMTP id 658A0A471F; Sat, 26 Apr 2008 09:36:18 +0200 (CEST) Message-ID: <4812DB72.2080000@lri.fr> Date: Sat, 26 Apr 2008 09:36:18 +0200 From: =?ISO-8859-1?Q?Jean-Christophe_Filli=E2tre?= User-Agent: Thunderbird 1.5.0.14ubu (X11/20080306) MIME-Version: 1.0 To: Jon Harrop Cc: caml-list@yquem.inria.fr Subject: Re: [Caml-list] Tries are to sequences as ? is to trees References: <200804260220.04921.jon@ffconsultancy.com> In-Reply-To: <200804260220.04921.jon@ffconsultancy.com> X-Enigmail-Version: 0.94.2.0 OpenPGP: url=http://www.lri.fr/~filliatr/mykey.asc Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 8bit X-Spam: no; 0.00; filliatre:01 filliatre:01 lri:01 okasaki's:01 lri:01 filliatr:01 caml-list:01 data:02 let:03 generalized:04 problem:05 fold:06 ecrit:06 sequences:07 sequences:07 Jon Harrop a écrit : > So tries let us associate sequences with values. What data structure lets us > associate trees with values? In Okasaki's book, there is a Section 10.3.2 "Generalized Tries" which addresses exactly this problem. The solution proposed is more efficient than building the list of elements with fold. -- Jean-Christophe Filliâtre http://www.lri.fr/~filliatr/