220 31938 article Path: news.gmane.org!.POSTED!not-for-mail From: Viacheslav Usov Newsgroups: gmane.comp.lang.c++.isocpp.proposals Subject: Re: multiple identically named variables Date: Mon, 3 Apr 2017 11:34:43 +0200 Lines: 92 Approved: news@gmane.org Message-ID: References: Reply-To: std-proposals@isocpp.org NNTP-Posting-Host: blaine.gmane.org Mime-Version: 1.0 Content-Type: multipart/alternative; boundary=94eb2c070e988967b0054c3fde79 X-Trace: blaine.gmane.org 1491212083 810 195.159.176.226 (3 Apr 2017 09:34:43 GMT) X-Complaints-To: usenet@blaine.gmane.org NNTP-Posting-Date: Mon, 3 Apr 2017 09:34:43 +0000 (UTC) To: "ISO C++ Standard - Future Proposals" Original-X-From: std-proposals+bncBDU6VRPKW4BBBNFORDDQKGQENXZDMIQ@isocpp.org Mon Apr 03 11:34:39 2017 Return-path: Envelope-to: gclcip-std-proposals@m.gmane.org Original-Received: from mail-yb0-f198.google.com ([209.85.213.198]) by blaine.gmane.org with esmtp (Exim 4.84_2) (envelope-from ) id 1cuyNj-000817-2n for gclcip-std-proposals@m.gmane.org; Mon, 03 Apr 2017 11:34:39 +0200 Original-Received: by mail-yb0-f198.google.com with SMTP id c126sf6461072ybf.6 for ; Mon, 03 Apr 2017 02:34:45 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=isocpp-org.20150623.gappssmtp.com; s=20150623; h=mime-version:in-reply-to:references:from:date:message-id:subject:to :x-original-sender:x-original-authentication-results:reply-to :precedence:mailing-list:list-id:x-spam-checked-in-group:list-post :list-help:list-archive:list-subscribe:list-unsubscribe; bh=/vGtpszblFmF0ypJB4PQS4rAppqx+tJXxEmM+zuMUCE=; b=giKRpihznFg7Q+Rut8kE8EbTAfn/IkHzHpHxFX8Lu4cwHSR1qNNMr7rR51r518mZ81 WifYCFXslj6W581UF1mH67WBNHq07Zdv+n7v9Sal/0tH+JEQ3Ht+Q50XUUb/RTMqX6WD pJGp5UwSMrKFK1eldbshQWNd0LwpnlesmHwx16yFeqfWG84YaWqNKPm0+49gdBsP6e02 u3Ol7+3jILCvEIaCobMR6GR8ybRJV6i3UTfrNURMl4+FDH5KsngTmy0Act1ZthB30hVb 4NV2YKjK4nPg7CCdnN9Jw1O0Cg8/PxC7jSKQrfdRPclocO5xdf9UIHJGluWY4Q73tVAr smwA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:in-reply-to:references:from:date :message-id:subject:to:x-original-sender :x-original-authentication-results:reply-to:precedence:mailing-list :list-id:x-spam-checked-in-group:list-post:list-help:list-archive :list-subscribe:list-unsubscribe; bh=/vGtpszblFmF0ypJB4PQS4rAppqx+tJXxEmM+zuMUCE=; b=AXt1E45XWLWSj3ZaqoDY5+Mhbvk1BFJXBwgdVM5TTySBVHIUNHeIFMYlY8ks/LZCgj ZT+xEzNkfFndtRTJNewUDjwKWTiljBdJHa2DkSBx+n7bzMmlElrHm3u6a55SkCJnSwTN f3IJa95zT5wcDH8UWO/2VDHT7MNl1TEx6Esia8s6oouMnfZFU0Cb+7ijg9RUSg+3KEch hsocQpP0gPKxq+cUoSkgXCd56mdcu49yuj5o9oUYiIYwXBSWq0YSsCqvTAIXeaj64uMY +R4O8LnCPYavzyH+pwq865/rl3G1AgNLJJnMtnazrxyJn4GOINFEeCiao7dd080cCjGV y5uQ== X-Gm-Message-State: AFeK/H3BV/RALHzXwxDlb/Y9mYmz07R9tVeOMeyNnPun/MZAiotrWBYWry9cTlk6qvEG/g== X-Received: by 10.129.108.146 with SMTP id h140mr7439657ywc.4.1491212084793; Mon, 03 Apr 2017 02:34:44 -0700 (PDT) X-BeenThere: std-proposals@isocpp.org Original-Received: by 10.157.39.226 with SMTP id c89ls698953otb.2.gmail; Mon, 03 Apr 2017 02:34:44 -0700 (PDT) X-Received: by 10.233.235.148 with SMTP id b142mr15347320qkg.284.1491212084085; Mon, 03 Apr 2017 02:34:44 -0700 (PDT) Original-Received: from mail-qk0-x22e.google.com (mail-qk0-x22e.google.com. [2607:f8b0:400d:c09::22e]) by mx.google.com with ESMTPS id a90si2171629qkj.276.2017.04.03.02.34.44 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Mon, 03 Apr 2017 02:34:44 -0700 (PDT) Received-SPF: pass (google.com: domain of via.usov@gmail.com designates 2607:f8b0:400d:c09::22e as permitted sender) client-ip=2607:f8b0:400d:c09::22e; Original-Received: by mail-qk0-x22e.google.com with SMTP id h67so10136897qke.0 for ; Mon, 03 Apr 2017 02:34:44 -0700 (PDT) X-Received: by 10.55.177.68 with SMTP id a65mr14658748qkf.45.1491212083748; Mon, 03 Apr 2017 02:34:43 -0700 (PDT) Original-Received: by 10.12.157.78 with HTTP; Mon, 3 Apr 2017 02:34:43 -0700 (PDT) In-Reply-To: X-Original-Sender: via.usov@gmail.com X-Original-Authentication-Results: mx.google.com; dkim=pass header.i=@gmail.com; spf=pass (google.com: domain of via.usov@gmail.com designates 2607:f8b0:400d:c09::22e as permitted sender) smtp.mailfrom=via.usov@gmail.com; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=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:31938 Archived-At: --94eb2c070e988967b0054c3fde79 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable On Mon, Apr 3, 2017 at 11:13 AM, Maxim Yanchenko wrote: > If Viacheslav's proposal goes forward I'd like to see the scoping working > in initialization of such variables like this: > > int x=3D5; > { > double x=3Dx; // initialized from int > } > { > float x=3Dx; // initialized from int, not from double > } > > The above would conflict with [basic.scope.pdecl]: The point of declaration for a name is immediately after its complete declarator (Clause 8) and before its initializer (if any), except as noted below. [ Example: unsigned char x =3D 12; { unsigned char x =3D x; } Here the second x is initialized with its own (indeterminate) value. =E2=80= =94 end example ] (end) I doubt we can change that easily. Cheers, V. --=20 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 e= mail 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/CAA7YVg2JX6_sSFzyMV3hw9QfUw4JAmq7qr-J6NMC8Roez3k= Vhg%40mail.gmail.com. --94eb2c070e988967b0054c3fde79 Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: quoted-printable
On M= on, Apr 3, 2017 at 11:13 AM, Maxim Yanchenko <maxim.yanchenko@gma= il.com> wrote:
If Viacheslav's proposal goes fo= rward I'd like to see the scoping working in initialization of such var= iables like this:

int x=3D5;
{
=C2=A0 double x=3Dx= ; // initialized from int
}
{
=C2=A0 float x=3Dx; // initialized = from int, not from double
}


The above would conflict with [basic.scope.pdecl]:
The point of declaration for a name is immediately after its c= omplete declarator (Clause 8) and before its initializer (if any), except as noted below. [ Example:

=C2=A0unsigned char x =3D 12;
=C2=A0{ unsigned char x =3D x= ; }

Here the second x is initialized with its own = (indeterminate) value. =E2=80=94 end example ]

(end)

I doubt we can change that easily.

Cheers,
V.

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