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=0.0 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 mail3-relais-sop.national.inria.fr (mail3-relais-sop.national.inria.fr [192.134.164.104]) by yquem.inria.fr (Postfix) with ESMTP id 93F59BC6B for ; Tue, 9 Oct 2007 01:53:40 +0200 (CEST) X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: AgAAAFBgCkfAXQImh2dsb2JhbACORQEBAQgKKQ X-IronPort-AV: E=Sophos;i="4.21,245,1188770400"; d="scan'208";a="4074440" Received: from discorde.inria.fr ([192.93.2.38]) by mail3-smtp-sop.national.inria.fr with ESMTP; 09 Oct 2007 01:53:40 +0200 Received: from mail4-relais-sop.national.inria.fr (mail4-relais-sop.national.inria.fr [192.134.164.105]) by discorde.inria.fr (8.13.6/8.13.6) with ESMTP id l98Nrd3k030875 (version=TLSv1/SSLv3 cipher=RC4-SHA bits=128 verify=OK) for ; Tue, 9 Oct 2007 01:53:40 +0200 X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: AgAAAIBfCkfLENaMnmdsb2JhbACORQEBAQEHBAYRGA X-IronPort-AV: E=Sophos;i="4.21,245,1188770400"; d="scan'208";a="17608466" Received: from ipmail01.adl2.internode.on.net ([203.16.214.140]) by mail4-smtp-sop.national.inria.fr with ESMTP; 09 Oct 2007 01:53:38 +0200 X-IronPort-AV: E=Sophos;i="4.21,245,1188743400"; d="scan'208";a="206609251" Received: from ppp121-44-36-108.lns10.syd7.internode.on.net (HELO [192.168.1.201]) ([121.44.36.108]) by ipmail01.adl2.internode.on.net with ESMTP; 09 Oct 2007 09:17:33 +0930 Subject: Re: [Caml-list] Correct way of programming a CGI script From: skaller To: Arnaud Spiwack Cc: Caml List In-Reply-To: <470ABC09.4040601@gmail.com> References: <1191859489.10162.16.camel@localhost.localdomain> <1191879429.28011.27.camel@rosella.wigram> <20071009082147.657017dc.mle+ocaml@mega-nerd.com> <1191884703.26491.9.camel@rosella.wigram> <1191885562.26491.17.camel@rosella.wigram> <470ABC09.4040601@gmail.com> Content-Type: text/plain Date: Tue, 09 Oct 2007 09:47:31 +1000 Message-Id: <1191887251.26491.36.camel@rosella.wigram> Mime-Version: 1.0 X-Mailer: Evolution 2.10.1 Content-Transfer-Encoding: 7bit X-Miltered: at discorde with ID 470AC303.000 by Joe's j-chkmail (http://j-chkmail . ensmp . fr)! X-Spam: no; 0.00; 0200,:01 forall:01 rewriting:01 sourceforge:01 wrote:01 arnaud:01 caml-list:01 imperative:01 int:01 len:02 defined:02 functional:02 programming:03 guess:04 fix:05 On Tue, 2007-10-09 at 01:23 +0200, Arnaud Spiwack wrote: > > And here is the Felix (C++) version: > > > > int i; > > var x = ""; > > s := "a"; > > forall i in 1 upto 10_000_000 do > > x += s; > > done; > > println$ len x; > > > > Time: 0m0.198s > > Out of curiosity, does it work as well (meaning as fast) if you write "x > = s+x" instead ? I checked: x = x + s and that's slow, I guess x = s + x is also slow. In Felix I would be able to fix the x = x + s case with an imperative reduction, however Felix only supports functional reductions at the moment. [A reduction is a user defined term rewriting rule]. -- John Skaller Felix, successor to C++: http://felix.sf.net