From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!not-for-mail From: Andy Wingo Newsgroups: gmane.lisp.guile.user Subject: Re: manipulating continuations Date: Sat, 12 Feb 2011 18:16:20 +0100 Message-ID: References: <4D5694ED.7080402@gmail.com> <201102121640.p1CGe7PM003227@fcs13.keithdiane.us> NNTP-Posting-Host: lo.gmane.org Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii X-Trace: dough.gmane.org 1297531372 30238 80.91.229.12 (12 Feb 2011 17:22:52 GMT) X-Complaints-To: usenet@dough.gmane.org NNTP-Posting-Date: Sat, 12 Feb 2011 17:22:52 +0000 (UTC) Cc: guile-user@gnu.org To: Keith Wright Original-X-From: guile-user-bounces+guile-user=m.gmane.org@gnu.org Sat Feb 12 18:22:48 2011 Return-path: Envelope-to: guile-user@m.gmane.org Original-Received: from lists.gnu.org ([199.232.76.165]) by lo.gmane.org with esmtp (Exim 4.69) (envelope-from ) id 1PoJB6-0001cl-I7 for guile-user@m.gmane.org; Sat, 12 Feb 2011 18:22:44 +0100 Original-Received: from localhost ([127.0.0.1]:54867 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.43) id 1PoJB0-0000Jp-2G for guile-user@m.gmane.org; Sat, 12 Feb 2011 12:22:30 -0500 Original-Received: from [140.186.70.92] (port=36422 helo=eggs.gnu.org) by lists.gnu.org with esmtp (Exim 4.43) id 1PoJ0O-0002KT-HS for guile-user@gnu.org; Sat, 12 Feb 2011 12:12:12 -0500 Original-Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1PoJ0G-0000ln-NK for guile-user@gnu.org; Sat, 12 Feb 2011 12:11:28 -0500 Original-Received: from a-pb-sasl-sd.pobox.com ([64.74.157.62]:37768 helo=sasl.smtp.pobox.com) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1PoJ0G-0000le-H0 for guile-user@gnu.org; Sat, 12 Feb 2011 12:11:24 -0500 Original-Received: from sasl.smtp.pobox.com (unknown [127.0.0.1]) by a-pb-sasl-sd.pobox.com (Postfix) with ESMTP id A46872DB4; Sat, 12 Feb 2011 12:12:25 -0500 (EST) DKIM-Signature: v=1; a=rsa-sha1; c=relaxed; d=pobox.com; h=from:to:cc :subject:references:date:in-reply-to:message-id:mime-version :content-type; s=sasl; bh=WQ0h4Oay+wWNwS8ZExnZ7RU/588=; b=kTkh2w sGAZsYmwiNSdE5WLu2LIbnm95sa2yp84d74XErllHMcjNVyq1K0YNFByIXG8g0W9 QKISaY5pzrWb+7zC+ncr5UCXP+lpvAVyBVwZOX5gVkEv9zhxdMlCz2NuWvwKTZlz Z4ZOnXnaaGl424+JjXbklGoJSFg4iMj5VyZ08= DomainKey-Signature: a=rsa-sha1; c=nofws; d=pobox.com; h=from:to:cc :subject:references:date:in-reply-to:message-id:mime-version :content-type; q=dns; s=sasl; b=Qpb5XdV0/pZB4IMijUypwTJxM/cDtG9A qL3CZs85nIOZE/k49bo3p63GVIcdjfr64zZoKOhw5amtrLupaIJkRooZvtbcOqVS gHAdLEI3sHth0izFDerBCt4/v28g+essR1Y/yi0oZq92qL6WaFoRTyXBKEIYPeSz lVl+xLiC1+U= Original-Received: from a-pb-sasl-sd.pobox.com (unknown [127.0.0.1]) by a-pb-sasl-sd.pobox.com (Postfix) with ESMTP id 8029D2DAF; Sat, 12 Feb 2011 12:12:23 -0500 (EST) Original-Received: from unquote.localdomain (unknown [90.164.198.39]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by a-pb-sasl-sd.pobox.com (Postfix) with ESMTPSA id 5B6B42DAD; Sat, 12 Feb 2011 12:12:18 -0500 (EST) In-Reply-To: <201102121640.p1CGe7PM003227@fcs13.keithdiane.us> (Keith Wright's message of "Sat, 12 Feb 2011 11:40:07 -0500") User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/23.2 (gnu/linux) X-Pobox-Relay-ID: 41FF008A-36CB-11E0-8F14-AF401E47CF6F-02397024!a-pb-sasl-sd.pobox.com X-detected-operating-system: by eggs.gnu.org: Solaris 10 (beta) X-Received-From: 64.74.157.62 X-BeenThere: guile-user@gnu.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: General Guile related discussions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Original-Sender: guile-user-bounces+guile-user=m.gmane.org@gnu.org Errors-To: guile-user-bounces+guile-user=m.gmane.org@gnu.org Xref: news.gmane.org gmane.lisp.guile.user:8430 Archived-At: On Sat 12 Feb 2011 17:40, Keith Wright writes: > What is (% ...)? What is a "partial continuation"? % sets up a prompt. http://www.gnu.org/software/guile/docs/master/guile.html/Prompts.html http://en.wikipedia.org/wiki/Delimited_continuation http://www.ccs.neu.edu/scheme/pubs/pldi93-sitaram.pdf > Has Guile gone off into left field, never to return? Hardly, these control operators are nearly a quarter of a century old... > Can we continue from R5RS or R6RS? R5RS and R6RS's continuations are not generally useful for making abstractions that compose well together. I would not recommend them to anyone. Regards, Andy -- http://wingolog.org/