220 22204 article Path: news.gmane.org!not-for-mail From: Columbo Newsgroups: gmane.comp.lang.c++.isocpp.proposals Subject: Local constexpr variables and static storage duration Date: Mon, 2 Nov 2015 14:04:51 -0800 (PST) Lines: 67 Approved: news@gmane.org Message-ID: Reply-To: std-proposals@isocpp.org NNTP-Posting-Host: plane.gmane.org Mime-Version: 1.0 Content-Type: multipart/mixed; boundary="----=_Part_4388_1085223667.1446501891823" X-Trace: ger.gmane.org 1446501900 8010 80.91.229.3 (2 Nov 2015 22:05:00 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Mon, 2 Nov 2015 22:05:00 +0000 (UTC) To: ISO C++ Standard - Future Proposals Original-X-From: std-proposals+bncBDRN5RPSR4MRBBF436YQKGQEBI5JFLA@isocpp.org Mon Nov 02 23:04:56 2015 Return-path: Envelope-to: gclcip-std-proposals@m.gmane.org Original-Received: from mail-pa0-f72.google.com ([209.85.220.72]) by plane.gmane.org with esmtp (Exim 4.69) (envelope-from ) id 1ZtNDi-00027Q-Ta for gclcip-std-proposals@m.gmane.org; Mon, 02 Nov 2015 23:04:55 +0100 Original-Received: by pabyw1 with SMTP id yw1sf173387774pab.2 for ; Mon, 02 Nov 2015 14:04:53 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:date:from:to:message-id:subject:mime-version :content-type: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=MhCEnNGfPjbg/eoTi6oKHqtKHRFkj81QiGNfs2w1ZVg=; b=YGaYuEvjetXf51lomMN4tFte0IyNdN04e6NXYkhS1aTKISElmYLuV0mSxtySMlU1eG YEQLwKub56dDLmAS7RI3ItBbC+FCh4rvsa0gIUVg1rHCPI3dYmG7hc+sH1bGhFrmZUEs m/iOsDQwWaOk7te6kjW7+H03VMQFhb+5hFsoAqA3tPqpg+4uDwWSX2t5UWM1VZ788DQm OpvikSoaf7qV1dAHNyw1JywFJw0Hd+eFiulwXMyxn8HCCrSwxhHvcrqyBypmv8nPS/JZ dILiwwwC6lBFKmTFrhG8hxpguCCEGwnjWnjdQMyUZh2I7ADG+3/eQfSAzLoaXwzEoYG+ 1Vfg== X-Gm-Message-State: ALoCoQm6uNAclkiC5sX4+10YhkpjnBfEJhWzvnJczpbOwwIohZ1QJc2lB+ILIQ+1kwYnvPfNexXi X-Received: by 10.66.182.135 with SMTP id ee7mr21458227pac.32.1446501893285; Mon, 02 Nov 2015 14:04:53 -0800 (PST) X-BeenThere: std-proposals@isocpp.org Original-Received: by 10.107.10.226 with SMTP id 95ls1475882iok.1.gmail; Mon, 02 Nov 2015 14:04:52 -0800 (PST) X-Received: by 10.50.164.165 with SMTP id yr5mr227146igb.7.1446501892428; Mon, 02 Nov 2015 14:04:52 -0800 (PST) X-Original-Sender: R.HL@gmx.net Precedence: list Mailing-list: list std-proposals@isocpp.org; contact std-proposals+owners@isocpp.org List-ID: X-Spam-Checked-In-Group: std-proposals@isocpp.org 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:22204 Archived-At: ------=_Part_4388_1085223667.1446501891823 Content-Type: multipart/alternative; boundary="----=_Part_4389_1147885575.1446501891824" ------=_Part_4389_1147885575.1446501891824 Content-Type: text/plain; charset=UTF-8 Is it possible to let local variables declared with constexpr have static storage duration? Since every constexpr variables's initializer can neither depend upon parameter values nor dynamically initialized (or modifiable) global state, they may as well have static storage duration with static initialization AFAICS. Would that introduce any problems or have significant impacts? Note that it would allow reasonable things that are currently disallowed, e.g. void f() { constexpr int arr[] {1, 2, 3}; constexpr auto p = arr; } -- --- 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. Visit this group at http://groups.google.com/a/isocpp.org/group/std-proposals/. ------=_Part_4389_1147885575.1446501891824 Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: quoted-printable
Is it possible to let local variables declared with=C2=A0<= font face=3D"courier new, monospace">constexpr=C2=A0have=C2=A0static=C2=A0storage duration? Since = every=C2=A0constexpr=C2=A0vari= ables's initializer can neither depend upon parameter values nor dynami= cally initialized (or modifiable) global state, they may as well have stati= c storage duration with static initialization AFAICS. =C2=A0Would that intr= oduce any problems or have significant impacts? Note that it would allow re= asonable things that are currently disallowed, e.g.
v= oid f() {
=C2=A0 =C2=A0 constexpr int ar= r[] {1, 2, 3};=C2=A0
=C2=A0 =C2=A0 const= expr auto p =3D arr;
}

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