From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.blaine.gmane.org!not-for-mail From: Philip Kaludercic Newsgroups: gmane.emacs.devel Subject: Re: Why shouldn't we have a #if .... #else .... #endif construct in Emacs Lisp? Date: Sat, 02 Sep 2023 19:20:29 +0000 Message-ID: <87pm30e60y.fsf@posteo.net> References: Mime-Version: 1.0 Content-Type: text/plain Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="18235"; mail-complaints-to="usenet@ciao.gmane.io" Cc: Stefan Kangas , emacs-devel@gnu.org, Mattias =?utf-8?Q?Engdeg=C3=A5rd?= To: Alan Mackenzie Original-X-From: emacs-devel-bounces+ged-emacs-devel=m.gmane-mx.org@gnu.org Sat Sep 02 21:21:05 2023 Return-path: Envelope-to: ged-emacs-devel@m.gmane-mx.org Original-Received: from lists.gnu.org ([209.51.188.17]) by ciao.gmane.io with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1qcWB7-0004aS-K7 for ged-emacs-devel@m.gmane-mx.org; Sat, 02 Sep 2023 21:21:05 +0200 Original-Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1qcWAd-0002e5-Oe; Sat, 02 Sep 2023 15:20:35 -0400 Original-Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1qcWAc-0002dj-GC for emacs-devel@gnu.org; Sat, 02 Sep 2023 15:20:34 -0400 Original-Received: from mout01.posteo.de ([185.67.36.65]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1qcWAa-0002fF-Cu for emacs-devel@gnu.org; Sat, 02 Sep 2023 15:20:34 -0400 Original-Received: from submission (posteo.de [185.67.36.169]) by mout01.posteo.de (Postfix) with ESMTPS id E4748240028 for ; Sat, 2 Sep 2023 21:20:30 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=posteo.net; s=2017; t=1693682430; bh=HfDNm5jYyKGxjtaq2I13CBPfkOX/M1efNTsx0x679SE=; h=From:To:Cc:Subject:Autocrypt:Date:Message-ID:MIME-Version:From; b=Vr0NhPtEY1gfvg2esNMQkuU/krVNWNPUPHTYdaG7v/22RmRvbpILa31CnyOv+AY+k d0v/2AlaqODvvQ9Gd78qFLb2E/wPWOYi7TK3mBzY2Z/bvSQ/D+E46qAQ1qxCFBpSQu ZI3xn22C6tPRA1838ctiVhVnIvUXmM8n9xmENXw/fZpJQWOZOin8OL7Rg+gDdzjn+y Q59CCOHYxXKjRmi+9mMn8IiPVveNaJGNBvYaPo58UbBABc0lZP+KcUMzHA9BEz5nUC v1HZcxp2rqtNKlUcgtKqc445FyQ0a3RXzob4zs1Nobz+/3XShyc7iZyagl1aTUJmUO Jb0TRVU/zuEdg== Original-Received: from customer (localhost [127.0.0.1]) by submission (posteo.de) with ESMTPSA id 4RdPqy39YVz6txS; Sat, 2 Sep 2023 21:20:30 +0200 (CEST) In-Reply-To: (Alan Mackenzie's message of "Sat, 2 Sep 2023 15:06:46 +0000") Autocrypt: addr=philipk@posteo.net; keydata= mDMEZBBQQhYJKwYBBAHaRw8BAQdAHJuofBrfqFh12uQu0Yi7mrl525F28eTmwUDflFNmdui0QlBo aWxpcCBLYWx1ZGVyY2ljIChnZW5lcmF0ZWQgYnkgYXV0b2NyeXB0LmVsKSA8cGhpbGlwa0Bwb3N0 ZW8ubmV0PoiWBBMWCAA+FiEEDg7HY17ghYlni8XN8xYDWXahwukFAmQQUEICGwMFCQHhM4AFCwkI BwIGFQoJCAsCBBYCAwECHgECF4AACgkQ8xYDWXahwulikAEA77hloUiSrXgFkUVJhlKBpLCHUjA0 mWZ9j9w5d08+jVwBAK6c4iGP7j+/PhbkxaEKa4V3MzIl7zJkcNNjHCXmvFcEuDgEZBBQQhIKKwYB BAGXVQEFAQEHQI5NLiLRjZy3OfSt1dhCmFyn+fN/QKELUYQetiaoe+MMAwEIB4h+BBgWCAAmFiEE Dg7HY17ghYlni8XN8xYDWXahwukFAmQQUEICGwwFCQHhM4AACgkQ8xYDWXahwukm+wEA8cml4JpK NeAu65rg+auKrPOP6TP/4YWRCTIvuYDm0joBALw98AMz7/qMHvSCeU/hw9PL6u6R2EScxtpKnWof z4oM Received-SPF: pass client-ip=185.67.36.65; envelope-from=philipk@posteo.net; helo=mout01.posteo.de X-Spam_score_int: -43 X-Spam_score: -4.4 X-Spam_bar: ---- X-Spam_report: (-4.4 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_MED=-2.3, RCVD_IN_MSPIKE_H5=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: emacs-devel@gnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "Emacs development discussions." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: emacs-devel-bounces+ged-emacs-devel=m.gmane-mx.org@gnu.org Original-Sender: emacs-devel-bounces+ged-emacs-devel=m.gmane-mx.org@gnu.org Xref: news.gmane.io gmane.emacs.devel:309906 Archived-At: Alan Mackenzie writes: > +;; Note: `static-if' handles the version of `eval' without the &optional > +;; parameter LEXICAL so that it can be copied unchanged for use in older > +;; Emacsen. Is this really a concern for the version that would be added to Emacs itself? > +(defmacro static-if (condition then-form &rest else-forms) > + "A conditional compilation macro analogous to C's #if. > +Evaluate CONDITION at macro-expansion time. If it is non-nil, > +expand the macro to THEN-FORM. Otherwise expand it to ELSE-FORMS > +enclosed in a `progn' form. ELSE-FORMS may be empty." > + (declare (indent 2) > + (debug (sexp sexp &rest sexp))) > + (if (condition-case err > + (eval condition lexical-binding) > + ((wrong-number-of-arguments void-variable) (eval condition)) > + ((debug error) (signal (car err) (cdr err)))) > + then-form > + (cons 'progn else-forms)))