From 64affc5b1164e56f527595c81c9519d3b026c578 Mon Sep 17 00:00:00 2001 From: Austin Clements Date: Mon, 19 Nov 2012 22:48:28 +1900 Subject: [PATCH] Re: emacs's function special form --- 6c/cf503fe2c6b45ca408caa2c55d261cd1e9cee6 | 112 ++++++++++++++++++++++ 1 file changed, 112 insertions(+) create mode 100644 6c/cf503fe2c6b45ca408caa2c55d261cd1e9cee6 diff --git a/6c/cf503fe2c6b45ca408caa2c55d261cd1e9cee6 b/6c/cf503fe2c6b45ca408caa2c55d261cd1e9cee6 new file mode 100644 index 000000000..b8f1fc725 --- /dev/null +++ b/6c/cf503fe2c6b45ca408caa2c55d261cd1e9cee6 @@ -0,0 +1,112 @@ +Return-Path: +X-Original-To: notmuch@notmuchmail.org +Delivered-To: notmuch@notmuchmail.org +Received: from localhost (localhost [127.0.0.1]) + by olra.theworths.org (Postfix) with ESMTP id 069B0431FBD + for ; Sun, 18 Nov 2012 19:48:36 -0800 (PST) +X-Virus-Scanned: Debian amavisd-new at olra.theworths.org +X-Spam-Flag: NO +X-Spam-Score: -0.7 +X-Spam-Level: +X-Spam-Status: No, score=-0.7 tagged_above=-999 required=5 + tests=[RCVD_IN_DNSWL_LOW=-0.7] autolearn=disabled +Received: from olra.theworths.org ([127.0.0.1]) + by localhost (olra.theworths.org [127.0.0.1]) (amavisd-new, port 10024) + with ESMTP id pt9ti9ypRPv2 for ; + Sun, 18 Nov 2012 19:48:34 -0800 (PST) +Received: from dmz-mailsec-scanner-7.mit.edu (DMZ-MAILSEC-SCANNER-7.MIT.EDU + [18.7.68.36]) + by olra.theworths.org (Postfix) with ESMTP id 4307A431FB6 + for ; Sun, 18 Nov 2012 19:48:34 -0800 (PST) +X-AuditID: 12074424-b7fce6d000000925-69-50a9ac10da6d +Received: from mailhub-auth-3.mit.edu ( [18.9.21.43]) + by dmz-mailsec-scanner-7.mit.edu (Symantec Messaging Gateway) with SMTP + id 37.42.02341.01CA9A05; Sun, 18 Nov 2012 22:48:33 -0500 (EST) +Received: from outgoing.mit.edu (OUTGOING-AUTH.MIT.EDU [18.7.22.103]) + by mailhub-auth-3.mit.edu (8.13.8/8.9.2) with ESMTP id qAJ3mWIe031824; + Sun, 18 Nov 2012 22:48:32 -0500 +Received: from awakening.csail.mit.edu (awakening.csail.mit.edu [18.26.4.91]) + (authenticated bits=0) + (User authenticated as amdragon@ATHENA.MIT.EDU) + by outgoing.mit.edu (8.13.6/8.12.4) with ESMTP id qAJ3mTeh028854 + (version=TLSv1/SSLv3 cipher=AES256-SHA bits=256 verify=NOT); + Sun, 18 Nov 2012 22:48:31 -0500 (EST) +Received: from amthrax by awakening.csail.mit.edu with local (Exim 4.77) + (envelope-from ) + id 1TaILU-0000gx-P2; Sun, 18 Nov 2012 22:48:28 -0500 +From: Austin Clements +To: Ethan , Aaron Ecay +Subject: Re: emacs's function special form +In-Reply-To: + +References: + +User-Agent: Notmuch/0.14+100~gcb9b0b0 (http://notmuchmail.org) Emacs/23.3.1 + (i486-pc-linux-gnu) +Date: Sun, 18 Nov 2012 22:48:28 -0500 +Message-ID: <87zk2e9rsj.fsf@awakening.csail.mit.edu> +MIME-Version: 1.0 +Content-Type: text/plain; charset=utf-8 +Content-Transfer-Encoding: quoted-printable +X-Brightmail-Tracker: + H4sIAAAAAAAAA+NgFprKKsWRmVeSWpSXmKPExsUixCmqrSu4ZmWAwdblLBbTln9ht7jTs4vF + 4vrNmcwOzB47Z91l93i26hZzAFMUl01Kak5mWWqRvl0CV8a8m/2MBSu5K/aee8DawNjK2cXI + ySEhYCJxbM1JZghbTOLCvfVsXYxcHEIC+xglrry/yAjhbGCUOLvkGguEc5JJov3OOnYIZwmj + xL3Xk1lA+tkE9CVWrJ3E2sXIwSEi4CXRcqAIJMwsYCRxf8d0ZpCwsICWxOx5iiBhToFAickL + 7rCC2EICARL7pvazg9iiAvESM7dOBbuIRUBVYv+sFjCbF+jS/1eOMkHYghInZz5hgRivLvFn + 3iVmCFtbYtnC18wTGIVmISmbhaRsFpKyBYzMqxhlU3KrdHMTM3OKU5N1i5MT8/JSi3TN9XIz + S/RSU0o3MYJCnN1FZQdj8yGlQ4wCHIxKPLwv2lYGCLEmlhVX5h5ilORgUhLlnbEKKMSXlJ9S + mZFYnBFfVJqTWnyIUYKDWUmEN2UWUI43JbGyKrUoHyYlzcGiJM57PeWmv5BAemJJanZqakFq + EUxWhoNDSYL3CshQwaLU9NSKtMycEoQ0EwcnyHAeoOFNIDW8xQWJucWZ6RD5U4y6HHNmtj9h + FGLJy89LlRLn3QdSJABSlFGaBzcHlppeMYoDvSUMMYoHmNbgJr0CWsIEtORawHKQJSWJCCmp + BsbQDTITv1gb7ZR3rZSKeuxW43G6WXDG4n0zxX/clYq0/OMaclBx85LdcUW6XysKbO+JeeQs + OXPnROD8kpMHTJYVZPrczfvAIrN9x/Jy573NIhM1ti00SjlWePSSiEjii9dzP9t9Luy12nu8 + 0dUw+GnO1LPP9l59lL14z3yP3ig2o9A+xxWf/bKUWIozEg21mIuKEwHVvsGTKAMAAA== +Cc: notmuch mailing list +X-BeenThere: notmuch@notmuchmail.org +X-Mailman-Version: 2.1.13 +Precedence: list +List-Id: "Use and development of the notmuch mail system." + +List-Unsubscribe: , + +List-Archive: +List-Post: +List-Help: +List-Subscribe: , + +X-List-Received-Date: Mon, 19 Nov 2012 03:48:36 -0000 + +On Sun, 18 Nov 2012, Ethan wrote: +> On Sun, Nov 18, 2012 at 7:10 PM, Aaron Ecay wrote: +> +>> 2012ko azaroak 18an, Ethan Glasser-Camp-ek idatzi zuen: +>> > +>> > - You might want to use #' on lambdas. +>> +>> This is actually unnecessary =E2=80=93 as the info node "(elisp) Anonymo= +us +>> Functions" says, the forms with and without #' are equivalent. The +>> current notmuch style is not to have #' on lambdas (that is, there are 0 +>> instances of #'(lambda ...) in the code base). IMO that=E2=80=99s corre= +ct: +>> the unnecessary #' is just line-noise-ish. +>> +> +> OK, I think I understand. Thanks for the clarification. I found that info +> node very confusing. +> +> It says that #' has effects "assuming function-object is a valid lambda +> expression". So why put #' on variables that are the names of functions? +> +> In fact, outside names of functions, when are you supposed to use #' at a= +ll? + +You don't need to use #' on a lambda form because lambda is actually a +macro (implemented in Elisp!) that expands to + #'(lambda ...) +so using #' would be redundant. But you should use it on function +symbols to hint the byte code compiler that you're referring to a +function rather than a variable. Using #' on symbols affects the +optimizer (and may improve warnings?), even though the info node doesn't +explicitly say how. Plus, #' makes code more self-documenting. -- 2.26.2