220 41400 <1828d3a1-5211-4b53-9521-e926f7fa0fb7@isocpp.org> article Path: news.gmane.org!.POSTED.blaine.gmane.org!not-for-mail From: Nicol Bolas Newsgroups: gmane.comp.lang.c++.isocpp.proposals Subject: Re: comparison operators for std::initializer_list Date: Fri, 25 Jan 2019 07:02:21 -0800 (PST) Approved: news@gmane.org Message-ID: <1828d3a1-5211-4b53-9521-e926f7fa0fb7@isocpp.org> References: <24be1c08-b474-4e08-8b3f-0d6cbb4d9a8e@isocpp.org> Reply-To: std-proposals@isocpp.org Mime-Version: 1.0 Content-Type: multipart/mixed; boundary="----=_Part_816_1305729088.1548428541833" Injection-Info: blaine.gmane.org; posting-host="blaine.gmane.org:195.159.176.226"; logging-data="148082"; mail-complaints-to="usenet@blaine.gmane.org" To: ISO C++ Standard - Future Proposals Original-X-From: std-proposals+bncBCEKFTV6ZUMBB7WJVTRAKGQEYMDIFUI@isocpp.org Fri Jan 25 16:02:25 2019 Return-path: Envelope-to: gclcip-std-proposals@m.gmane.org Original-Received: from mail-yb1-f198.google.com ([209.85.219.198]) by blaine.gmane.org with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.89) (envelope-from ) id 1gn2zx-000cO3-K4 for gclcip-std-proposals@m.gmane.org; Fri, 25 Jan 2019 16:02:25 +0100 Original-Received: by mail-yb1-f198.google.com with SMTP id l83sf4678210ybl.3 for ; Fri, 25 Jan 2019 07:02:25 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=isocpp-org.20150623.gappssmtp.com; s=20150623; h=date:from:to:message-id:in-reply-to:references:subject:mime-version :x-original-sender:reply-to:precedence:mailing-list:list-id :list-post:list-help:list-archive:list-subscribe:list-unsubscribe; bh=IdKUFyrEdo9pGiC2y5SHQw7OjcMeHRPi3/qVXeNHdDk=; b=DvoUVt6wtEsAmmCBix2JaFGfi3UXqt+bvhviU0Q82yr4Dw0NQ6qzX5Z4Ajj2m63QEx RufDkD9ljKMvqSjAN702uThio70nxdWV23viSnuOvsA0gm0nJArYmsWPFPDgtTSpM83J WNeLUnMjdW0PnII7ES4RTghzJL9obB9yU7o9JmIV4jvRD7AwncIovAri8KlnT1/SFF/K dSdN7OkBo/i+uBvQUByaCkLEygWgt3J1wPybfgF6eEPPDHN3jAmAg3OStOolCtNaKYPY zmHO+cnTmg4K6KrE/j11yru9WUUboouAfhUT6fS/iZxU7T0Xbev6SYFSa9CCzdLatowG Ynyw== DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=date:from:to:message-id:in-reply-to:references:subject:mime-version :x-original-sender:reply-to:precedence:mailing-list:list-id :list-post:list-help:list-archive:list-subscribe:list-unsubscribe; bh=IdKUFyrEdo9pGiC2y5SHQw7OjcMeHRPi3/qVXeNHdDk=; b=lXqRpe+x8aegGAJtOR6+gywSKo3CW6yRRBYcykV+yEVG8sIDWlPfzky8M8rGnhXAA1 E4fEwb/+pdn8qIas9+bgb6dRqF9wWmZoE/QQ10APc5uX6vU+VX73wvQEk0iN7TSEB+uL +04ueYebP+0hlNZW9TEkqeHBHPLwAWwpmr5jPnb4RTcxbUb5OdHQg+LeD5e3Mf4yLfCO or15Mj00wk/+QWp1xnU6GTnCp5mZywa3vcc0wYzcns7B3ukOCuFzxiRYjXXDFK9e8X+9 6BbMK0RpLqLaD44yGRPVt+j8/rxbXfMjrD9eP0N1sGajwbOKDSnATk58lxWiZ/J5r9M5 SMog== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:from:to:message-id:in-reply-to:references :subject:mime-version:x-original-sender:reply-to:precedence :mailing-list:list-id:x-spam-checked-in-group:list-post:list-help :list-archive:list-subscribe:list-unsubscribe; bh=IdKUFyrEdo9pGiC2y5SHQw7OjcMeHRPi3/qVXeNHdDk=; b=fYfGKSkkRKgBYVwbT4thcmWDbfPyvHJ3+dT542PRARXVdwWVC2Ba46uSrodGz9Tr4H rn6MQZx/WDctRtRqU1mAUA7cmcgBrgWXd19kklgOdWidFn/vnImJgMpAJxrXjt5XAPpg ZfiP2QCLW24oe3Dk0s7iR+MrMDML6VW24NYPWoRJk3IRkeAMijNRlnt+lqa3SUF1KtIA bDMw6k9Tbps3BG+lunpRUSkZgWe4NL71XhUMSI4b4BbDn0tiBASqZvdm8ctscrIdwX8h /Hy1wR1P75/TvPmHLHt5LOb9yoEXnI60Ty3/6SmKnLVZ/lZmVzTGIE3auW6/dJThIST5 fafA== X-Gm-Message-State: AJcUukftONlYsRU8TeTYwz1oOPZdggNQhq/WZvDcothMM4i2vZC/lncH ERmti/Ywd3x+pYnKmDUQ8BPefg== X-Google-Smtp-Source: ALg8bN54ggIpqxNqCCwxsOmR4ke2bvd8B4KHtRpvnTIJsG4/3qB6yocdZa89TVsGh6hAcLZgtRZY0g== X-Received: by 2002:a25:3d05:: with SMTP id k5mr5677458yba.7.1548428543972; Fri, 25 Jan 2019 07:02:23 -0800 (PST) X-BeenThere: std-proposals@isocpp.org Original-Received: by 2002:a25:6d41:: with SMTP id i62ls2844943ybc.11.gmail; Fri, 25 Jan 2019 07:02:22 -0800 (PST) X-Received: by 2002:a25:234a:: with SMTP id j71mr49177ybj.2.1548428542513; Fri, 25 Jan 2019 07:02:22 -0800 (PST) In-Reply-To: <24be1c08-b474-4e08-8b3f-0d6cbb4d9a8e@isocpp.org> X-Original-Sender: jmckesson@gmail.com Precedence: list Mailing-list: list std-proposals@isocpp.org; contact std-proposals+owners@isocpp.org List-ID: X-Google-Group-Id: 399137483710 List-Post: , List-Help: , List-Archive: List-Subscribe: , List-Unsubscribe: , Xref: news.gmane.org gmane.comp.lang.c++.isocpp.proposals:41400 Archived-At: ------=_Part_816_1305729088.1548428541833 Content-Type: multipart/alternative; boundary="----=_Part_817_748329377.1548428541833" ------=_Part_817_748329377.1548428541833 Content-Type: text/plain; charset="UTF-8" An `initializer_list`, as the name suggests, is a list meant to be used to initialize an object. That is why it exists: to help you initialize an object from a homogeneous sequence of values. If you're doing comparisons between such lists, then I submit that you're using the object incorrectly, that it's being used for a purpose outside of its intended use case. Thanks to CTAD, we can do `std::array a = {1, 2};`, so there's really no reason to use an `auto`-deduced `initializer_list` instead of a proper type. -- You received this message because you are subscribed to the Google Groups "ISO C++ Standard - Future Proposals" group. To unsubscribe from this group and stop receiving emails from it, send an email to std-proposals+unsubscribe@isocpp.org. To post to this group, send email to std-proposals@isocpp.org. To view this discussion on the web visit https://groups.google.com/a/isocpp.org/d/msgid/std-proposals/1828d3a1-5211-4b53-9521-e926f7fa0fb7%40isocpp.org. ------=_Part_817_748329377.1548428541833 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
An `initializer_list`, as the name suggests, is a lis= t meant to be used to initialize an object. That is why it exists: to help = you initialize an object from a homogeneous sequence of values.

If you're doing comparisons between such lists, then = I submit that you're using the object incorrectly, that it's being = used for a purpose outside of its intended use case. Thanks to CTAD, we can= do `std::array a =3D {1, 2};`, so there's really no reason to use an `= auto`-deduced `initializer_list` instead of a proper type.

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To view this discussion on the web visit https://groups.google.= com/a/isocpp.org/d/msgid/std-proposals/1828d3a1-5211-4b53-9521-e926f7fa0fb7= %40isocpp.org.
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