From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-4.7 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,NICE_REPLY_A,SPF_HELO_NONE, SPF_PASS,URIBL_BLOCKED,USER_AGENT_SANE_1 autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id A42F8C432BE for ; Sat, 28 Aug 2021 00:17:52 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 85E0D61004 for ; Sat, 28 Aug 2021 00:17:52 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232790AbhH1ASl (ORCPT ); Fri, 27 Aug 2021 20:18:41 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:42142 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232616AbhH1ASk (ORCPT ); Fri, 27 Aug 2021 20:18:40 -0400 Received: from mail-wr1-x434.google.com (mail-wr1-x434.google.com [IPv6:2a00:1450:4864:20::434]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 24EE3C0617A8 for ; Fri, 27 Aug 2021 17:17:51 -0700 (PDT) Received: by mail-wr1-x434.google.com with SMTP id u9so12790006wrg.8 for ; Fri, 27 Aug 2021 17:17:51 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=subject:from:to:cc:references:message-id:date:user-agent :mime-version:in-reply-to:content-language:content-transfer-encoding; bh=f5+uIv75v+7ZPSyvrBcLUj31d69A/pBWqE2NHmPHfoc=; b=iDZSdc4wZkG0QpiROmmtPxKRFobhcoe06kFX5JKcx4yyXeUOjemDbCkwaFxxYx2JP+ Wr1aTthKB9nU2FzBe+U5hMiZQZdUXtn25iuvDBA8zv2LuOuP2weiHcjvNb4jl9Nk/jW7 j8FDeNFia+yoMNmVIgcUpMekSy6EIcLX8gUdGNZZibmjVCbX89bqkOrBqyTeHczzNXN5 +hshbOAEbXJavchWVSPsjOXOtjI+UbdrikBx1DgO8ikSUpMKp443cuDQJDrT7pVE+06I O3Ho4yN6hVUI4OiwnnXgDxHAzCvQQPh5VC3JrrIK9djpBK/fsoQCUmC85etMHZfjlCRr LIIQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:subject:from:to:cc:references:message-id:date :user-agent:mime-version:in-reply-to:content-language :content-transfer-encoding; bh=f5+uIv75v+7ZPSyvrBcLUj31d69A/pBWqE2NHmPHfoc=; b=l1c1nOvDRNlCVb+ZMUtN+1KWG93PPbnDKPo2l1Aeo7K1XObhclBoVlzOma7lS19cZl yYTyX7x89p1ltN3ppjrvYNa4R98m26+TjbRQO8u2zCGGlJAUsDUJeKrN8cfhtX4KiPSz vThQLk2mErejKGVQ8NcUL6HdXsRe3QwJZVeBfoB2Y86EmiHRuCzXUmD58QBD/zPVcukQ DkGtcGAU2Dj1PX019TfDTJhCfnulAxrXTOfKrDQ36tteEnAw7oJi8rQgJZ0qJV3T0ZS6 A2WkTJtaGNtxS3erlIav0Mi0V99jQigbJa6hGukQdR3u4yXE12I83VLRau9prOe06eJ8 EuJg== X-Gm-Message-State: AOAM530IKxPS08cTFZXYss14/Rt6szV3VEvkKy7ClbRcQHuOazox3iuM zdN15XtXKyHuF+5lt9bSc5k= X-Google-Smtp-Source: ABdhPJyMHdZR6+qQrN4TfQ2Zs0z+Fgc1VxfoV1hTKrMSXFktSv6Sd5UU9WBSC6xxOg8ax9Pwq3mPPw== X-Received: by 2002:adf:9e09:: with SMTP id u9mr5471410wre.306.1630109869781; Fri, 27 Aug 2021 17:17:49 -0700 (PDT) Received: from [10.8.0.50] ([195.53.121.100]) by smtp.gmail.com with ESMTPSA id c24sm7705894wrb.57.2021.08.27.17.17.49 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Fri, 27 Aug 2021 17:17:49 -0700 (PDT) Subject: Re: Error in 'man operator' From: "Alejandro Colomar (man-pages)" To: David Sletten Cc: linux-man@vger.kernel.org, mtk.manpages@gmail.com References: <4cc4d818-58ad-529e-dd25-df3cb0fae66d@gmail.com> <71c78812-940e-8c15-c9ae-0dcde955232d@gmail.com> <40cbdcb1-1356-b749-ed53-61ed9dc2dd2e@gmail.com> Message-ID: <6666465a-ad5d-d8f7-92b1-35733f645961@gmail.com> Date: Sat, 28 Aug 2021 02:17:48 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.13.0 MIME-Version: 1.0 In-Reply-To: <40cbdcb1-1356-b749-ed53-61ed9dc2dd2e@gmail.com> Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-man@vger.kernel.org Hi David, On 8/28/21 2:01 AM, Alejandro Colomar (man-pages) wrote: > I mean: > !(int)x > (int)!x > > The precedence doesn't matter there, as they apply one after the other, > right to left. > > So, I'll keep casts in row 2. Hmm, I just came up with some very stupid piece of code that can show the different precedence between "unary operators" and "cast operators": sizeof(int)x; Which I hope no-one on earth would ever want to be valid C. If casts had the same precedence as unary operators, this would be: First, cast x to int, then apply sizeof to the resulting int (since sizeof can be used without parentheses on non-types). But since sizeof has greater precedence than the cast, it would be: First, calculate sizeof(int), then... x? Invalid expression! And luckily, the second thing happens, and the compiler yells: sizeof.c: In function ‘foo’: sizeof.c:3:20: error: expected ‘;’ before ‘x’ 3 | return sizeof(int)x; | ^ | ; So I think this deserves a new row. Thanks! Alex > > Cheers, > > Alex > -- Alejandro Colomar Linux man-pages comaintainer; https://www.kernel.org/doc/man-pages/ http://www.alejandro-colomar.es/