220 17448 <6212b9a0-1e90-4dc7-ad81-197e5a8e1c1c@isocpp.org> article Path: news.gmane.org!not-for-mail From: Columbo Newsgroups: gmane.comp.lang.c++.isocpp.proposals Subject: Re: In-class definition of pure virtual functions Date: Wed, 22 Apr 2015 04:31:33 -0700 (PDT) Lines: 75 Approved: news@gmane.org Message-ID: <6212b9a0-1e90-4dc7-ad81-197e5a8e1c1c@isocpp.org> References: Reply-To: std-proposals@isocpp.org NNTP-Posting-Host: plane.gmane.org Mime-Version: 1.0 Content-Type: multipart/mixed; boundary="----=_Part_5782_2019843229.1429702293799" X-Trace: ger.gmane.org 1429702304 15606 80.91.229.3 (22 Apr 2015 11:31:44 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Wed, 22 Apr 2015 11:31:44 +0000 (UTC) To: std-proposals@isocpp.org Original-X-From: std-proposals+bncBDRN5RPSR4MRBFUN32UQKGQEUWDJZWQ@isocpp.org Wed Apr 22 13:31:44 2015 Return-path: Envelope-to: gclcip-std-proposals@m.gmane.org Original-Received: from mail-qc0-f198.google.com ([209.85.216.198]) by plane.gmane.org with esmtp (Exim 4.69) (envelope-from ) id 1YkssS-00029v-4Z for gclcip-std-proposals@m.gmane.org; Wed, 22 Apr 2015 13:31:36 +0200 Original-Received: by qcbij4 with SMTP id ij4sf138065316qcb.1 for ; Wed, 22 Apr 2015 04:31:35 -0700 (PDT) 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:content-type:x-original-sender:reply-to :precedence:mailing-list:list-id:list-post:list-help:list-archive :list-subscribe:list-unsubscribe; bh=c+1GGea8PKF3jgJJfiNvIM8cntBDR6nigj47j02HeEU=; b=HfNlPEsnuRnpJ221/S2kG3DhY2rj6CQhukdTSaSUnov6Fs3QkQx9Wjra/9N3z/3Adf J5sDv7+ynZXi5192LSLLtjOJcoxuTOLMtOABpw1uvJfdX+6J1UHUKP+ubgx/tjka6ClN GyjtO44NFhdMTdqAVD7kRgcxnJMla4MZvL84JVsTaJW9SHugXXAlyj8y24JVlB1xiMzi 2lAqLpFASMDmM6cTM1qh/whdqDNkgjDjsWpxqr6BzpG7buNoiXQ8PW3XAQowCrYqsV1w zHVxdeJZWH6u9a9v+Jcak3RghDzVC/IkBpZat8IzDK+ww6XBA8KVQ2cGipPsvCNtx0Sf e8uw== X-Gm-Message-State: ALoCoQmnkEKJ1ePuNjtnQ0iK2APr7pNUHnfWqs6VbFUVQba0v9Gco3VY6I1RgWjCxQSEHdZdypmS X-Received: by 10.236.53.170 with SMTP id g30mr22030396yhc.17.1429702295234; Wed, 22 Apr 2015 04:31:35 -0700 (PDT) X-BeenThere: std-proposals@isocpp.org Original-Received: by 10.140.39.243 with SMTP id v106ls626363qgv.38.gmail; Wed, 22 Apr 2015 04:31:34 -0700 (PDT) X-Received: by 10.140.21.202 with SMTP id 68mr176751qgl.1.1429702294621; Wed, 22 Apr 2015 04:31:34 -0700 (PDT) In-Reply-To: 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-Google-Group-Id: 399137483710 List-Post: , List-Help: , List-Archive: List-Subscribe: , List-Unsubscribe: , Xref: news.gmane.org gmane.comp.lang.c++.isocpp.proposals:17448 Archived-At: ------=_Part_5782_2019843229.1429702293799 Content-Type: multipart/alternative; boundary="----=_Part_5783_83658027.1429702293799" ------=_Part_5783_83658027.1429702293799 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable Am Mittwoch, 22. April 2015 12:11:54 UTC+1 schrieb HenrikVallgren: > > Hi, > > I don=E2=80=99t see the point in this: the =E2=80=9D=3D0=E2=80=9D part sa= ys that you will not=20 > provide an=20 > implementation for this class and then you add an empty one? > =20 Andrey described it pretty well: The =3D0 part indicates that this is a *pu= re=20 *virtual function. =C2=A710.4/2: A pure virtual function need be defined only if called with, or as if with= =20 > (12.4), the *qualified-id* syntax (5.1). > --=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_5783_83658027.1429702293799 Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: quoted-printable
Am Mittwoch, 22. April 2015 12:11:54 UTC+1 schrieb HenrikV= allgren:
Hi,

I don=E2=80=99t see the poi= nt in this: the =E2=80=9D=3D0=E2=80=9D part says that you will not provide = an 
implementation for this class and then you add an empty = one?
 
Andrey described it pret= ty well: The =3D0 part indicates that this is a pure virtual functio= n. =C2=A710.4/2:

A pure virtual function need be defined only if called with, or as i= f with (12.4), the qualified-id syntax (5.1).

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