220 12679 <3ffb66f4-70dd-46ac-be8f-cab904b74e5c@isocpp.org> article Path: news.gmane.org!not-for-mail From: =?UTF-8?Q?Andrzej_Krzemie=C5=84ski?= Newsgroups: gmane.comp.lang.c++.isocpp.proposals Subject: Re: Re: Possibilities for uniform type name declaration Date: Thu, 4 Sep 2014 14:35:42 -0700 (PDT) Lines: 114 Approved: news@gmane.org Message-ID: <3ffb66f4-70dd-46ac-be8f-cab904b74e5c@isocpp.org> References: <83a1ebce-b43d-4d3f-86ea-83b1f85fd432@isocpp.org> <20140904170928.GA11632@bacon.lysator.liu.se> Reply-To: std-proposals@isocpp.org NNTP-Posting-Host: plane.gmane.org Mime-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_Part_5608_40808791.1409866542733" X-Trace: ger.gmane.org 1409866557 16795 80.91.229.3 (4 Sep 2014 21:35:57 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Thu, 4 Sep 2014 21:35:57 +0000 (UTC) To: std-proposals@isocpp.org Original-X-From: std-proposals+bncBDT2DGOJ34DBBL5WUOQAKGQEYI6ROMY@isocpp.org Thu Sep 04 23:35:46 2014 Return-path: Envelope-to: gclcip-std-proposals@m.gmane.org Original-Received: from mail-yk0-f200.google.com ([209.85.160.200]) by plane.gmane.org with esmtp (Exim 4.69) (envelope-from ) id 1XPegz-0001tk-OP for gclcip-std-proposals@m.gmane.org; Thu, 04 Sep 2014 23:35:46 +0200 Original-Received: by mail-yk0-f200.google.com with SMTP id 9sf33009745ykp.7 for ; Thu, 04 Sep 2014 14:35:44 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; 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 :content-type; bh=b2sAIp7hlwYaqsqUB5/KQmAxKTeAUWbbcjf3hMV6kRU=; b=rTVIZ4fErXZwbjDuyB+uufBDCpvSGr6pz5q301xGceeMEf9k2btv9rjTbQZkFNVKya J+2npD5NTAVDUM66nJgdCkEnTqlZ6AMfcJ93mqxPC0QgIQOoWdmRGrtiGmssP6bIgaWE WMpwHvTID4XIh0cK8c/I4/QhsQnzLgRl7AFTOWRVHSNTuDBxSMMjZZ2KQGEH3i4w0KlP dGiv+Oy8w7ImPp//z0gMxDeknRvvK4YFd6QRVBorxWiXJB71Kkh8umT6/RqGpWBy8VF4 cl20bUz5s+V2ak7wk9AkzwznBU56ZEPozPqcG1W5IKWAHtL87/qUIwXwLyG+L2/khN1K deyg== 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: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:content-type; bh=b2sAIp7hlwYaqsqUB5/KQmAxKTeAUWbbcjf3hMV6kRU=; b=DpcD4cpnOazt9hIiXTPEqBT+00u7SDfhxL8/d0roIILK9IO+VDCZhbNs6sxUAhdNxG E8haY2bN7f6GMGiIuDkyW048yp+4zdvf1rLk9AC2t6yjhIWpWYS++DdJJMc8pXtesc5r wPyrM/Q8t8i8MBlfMgLZaTsFMQVU4DnmS7qMvHQuEjJMhnYXaooxpC65LBqCLOayNM3F cnMUk7y2iqM0ZrUFm35hvJ1XUSauZ2CvXa+W3bGEgQYhNOJWVOBl5zB03/JkLqfAG1vx lNzGgPCTrzNpDryzdnmmn9j2WPZVameSCEm7Cudq/Dfdx+CQO6ENY3EybE0mN1C9fzG8 mLvw== X-Gm-Message-State: ALoCoQlB+FvsXB/b8t6w3nVleor7k2WW5GByG6W+m/TeSpM6800C6DOmH7nu9JeKMJzZ4sCYQx8U X-Received: by 10.236.148.2 with SMTP id u2mr2821641yhj.55.1409866544893; Thu, 04 Sep 2014 14:35:44 -0700 (PDT) X-BeenThere: std-proposals@isocpp.org Original-Received: by 10.140.51.51 with SMTP id t48ls471046qga.67.gmail; Thu, 04 Sep 2014 14:35:43 -0700 (PDT) X-Received: by 10.140.82.81 with SMTP id g75mr92668qgd.12.1409866543496; Thu, 04 Sep 2014 14:35:43 -0700 (PDT) In-Reply-To: <20140904170928.GA11632@bacon.lysator.liu.se> X-Original-Sender: akrzemi1@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:12679 Archived-At: ------=_Part_5608_40808791.1409866542733 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable W dniu czwartek, 4 wrze=C5=9Bnia 2014 19:09:34 UTC+2 u=C5=BCytkownik Magnus= Fromreide=20 napisa=C5=82: > > On Thu, Sep 04, 2014 at 01:55:09AM -0700, Andrzej Krzemie??ski wrote:=20 > >=20 > > I wonder if it would solve the problems I face. Can I use it to=20 > > forward-declare template instantiations as well? Eg.:=20 > >=20 > > namespace std=20 > > {=20 > > typename string;=20 > > }=20 > >=20 > > std::string is not a "class", but I would like to be able to=20 > > forward-declare it. (I am not sure if you could do that for namespace= =20 > std,=20 > > but it would still be useful for other namespaces). If this could be=20 > done,=20 > > I consider the proposal very useful. I often need to turn a class into = a=20 > > class template and hate to be forced to rewrite all my forward=20 > declarations.=20 > > Yes, it would be nice to be able to do that, but the problem is that give= n=20 > > typename foo;=20 > > you can't know what=20 > > sizeof(foo*);=20 > > is.=20 > Why? --=20 ---=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. Visit this group at http://groups.google.com/a/isocpp.org/group/std-proposa= ls/. ------=_Part_5608_40808791.1409866542733 Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: quoted-printable


W dniu czwartek, 4 wrze=C5=9Bnia 2014 19:09:34 UTC= +2 u=C5=BCytkownik Magnus Fromreide napisa=C5=82:
On Thu, Sep 04, 2014 at 01:55:09AM -0700, Andrzej Krzemi= e??ski wrote:
>=20
> I wonder if it would solve the problems I face. Can I use it to=20
> forward-declare template instantiations as well? Eg.:
>=20
> namespace std
> {
>   typename string;
> }
>=20
> std::string is not a "class", but I would like to be able to=20
> forward-declare it. (I am not sure if you could do that for namesp= ace std,=20
> but it would still be useful for other namespaces). If this could = be done,=20
> I consider the proposal very useful. I often need to turn a class = into a=20
> class template and hate to be forced to rewrite all my forward dec= larations.

Yes, it would be nice to be able to do that, but the problem is that gi= ven

typename foo;

you can't know what

sizeof(foo*);

is.

Why?

--

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