220 15290 <47ded514-49c4-4302-97f0-fbdb254c1ee7@isocpp.org> article Path: news.gmane.org!not-for-mail From: masse.nicolas@gmail.com Newsgroups: gmane.comp.lang.c++.isocpp.proposals Subject: Re: Add a [[removed]] attribute.. Date: Thu, 25 Dec 2014 04:02:32 -0800 (PST) Lines: 142 Approved: news@gmane.org Message-ID: <47ded514-49c4-4302-97f0-fbdb254c1ee7@isocpp.org> References: <6baa05af-d74d-43a1-a07e-cfd55bcae0ea@isocpp.org> Reply-To: std-proposals@isocpp.org NNTP-Posting-Host: plane.gmane.org Mime-Version: 1.0 Content-Type: multipart/mixed; boundary="----=_Part_5681_369766474.1419508952349" X-Trace: ger.gmane.org 1419508961 4405 80.91.229.3 (25 Dec 2014 12:02:41 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Thu, 25 Dec 2014 12:02:41 +0000 (UTC) Cc: 3dw4rd@verizon.net To: std-proposals@isocpp.org Original-X-From: std-proposals+bncBCCJBHV4UALBBWHZ56SAKGQEWEXTAIQ@isocpp.org Thu Dec 25 13:02:34 2014 Return-path: Envelope-to: gclcip-std-proposals@m.gmane.org Original-Received: from mail-ob0-f197.google.com ([209.85.214.197]) by plane.gmane.org with esmtp (Exim 4.69) (envelope-from ) id 1Y477i-0006rJ-Gx for gclcip-std-proposals@m.gmane.org; Thu, 25 Dec 2014 13:02:34 +0100 Original-Received: by mail-ob0-f197.google.com with SMTP id va2sf232713210obc.0 for ; Thu, 25 Dec 2014 04:02:33 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=date:from:to:cc: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=kDwK3nYi+h2MoKDLdOJeTs1eb/WSFbFRHLvhDDLxWoc=; b=ZVK0Ch0Cm/WkBxQmjS11MaqMkZMNPMT68v2E9Y5UTdxZ7YlUWPOV2duyA4wkCEavkZ pAUx41awWnSZVJRfl8uoNuCf3BOdZ6v1Y/6f8M935wSohNrTYcLbvZQFsaFfHC6f9Oyb PqSgAyLXFRvaJBCa/Sk/Ff4pYZKH4Pb1wwSISARdq5SmVJQSJh4fwFM/ZP3PrxGYyH5J RWiFMBTIcL8SvynnOHdXkaQtqqlzmLqQ71cc4iiSbo5AlYQWqsx5kMlPl/b8S4F99XSN 3PrZzKhtisZ8j563vfmIraT49BU9yzLJL3SiIOa5TV7IfKD+hJHdXIvhkeaI0blSHmlZ QFAQ== 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:cc: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=kDwK3nYi+h2MoKDLdOJeTs1eb/WSFbFRHLvhDDLxWoc=; b=TcAmpNJQ9uhrPLdkEz3/4OTPFtBQ6KkW2eWdruM22REQZ+9PvlrJoZzPxG0gJf73ak UTHFEShgkhC8t5p5C6LWUuAxdLIflGDasLPPUnJUtN0kyCUzCE0XosT++V7i0quhgZD9 CYN0tgEVC46U+MkFOKZ6Bdc5bU75gDq6EiFL+9vnDgDbOKnhtvcDhf9A3L5zuN/1ETvI bz6oLtT8C0byrorFdujCnkg5GEc8aLlgYl0xWjoNzjPFdYiN29P6tJVN2HpRyp64j3Nw SRmqE0QnXMFQ4WgNCp++yoNeM5RmCZWrvNJ1cdVnFx4W4Kf+p50h1q/z31wXOndq62Si cqLg== X-Gm-Message-State: ALoCoQlvFTHzfED5kEsMW3PQw24jdZhk9cH7yp5vW0G/JTJHMIVNOerVLQ0JMxRc4ZAAe1MzK6VC X-Received: by 10.182.120.99 with SMTP id lb3mr29332919obb.10.1419508953517; Thu, 25 Dec 2014 04:02:33 -0800 (PST) X-BeenThere: std-proposals@isocpp.org Original-Received: by 10.140.92.22 with SMTP id a22ls6539664qge.43.gmail; Thu, 25 Dec 2014 04:02:32 -0800 (PST) X-Received: by 10.140.93.17 with SMTP id c17mr28qge.26.1419508952784; Thu, 25 Dec 2014 04:02:32 -0800 (PST) In-Reply-To: <6baa05af-d74d-43a1-a07e-cfd55bcae0ea@isocpp.org> X-Original-Sender: Masse.Nicolas@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:15290 Archived-At: ------=_Part_5681_369766474.1419508952349 Content-Type: multipart/alternative; boundary="----=_Part_5682_1994937747.1419508952349" ------=_Part_5682_1994937747.1419508952349 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable #if __cplusplus =3D=3D 201402 [[deprecated("This function is deprecated and will be removed in a later" )]] int foo(); #elif __cplusplus > 201402 [[deprecated("Please use bar() instead")]] int foo() =3D delete; #endif Le jeudi 25 d=C3=A9cembre 2014 02:52:03 UTC+1, 3dw...@verizon.net a =C3=A9c= rit : > > Now that C++14 is out with attribute [[deprecated]] and now that C++17 is= =20 > moving forward with some removals of library features it seems lie a good= =20 > idea to at least consider a [[removed]] attribute that could take a=20 > message. This would allow an implementation to provide stronger dissuasi= on=20 > including compilation fail than [[deprecated]]. This allows finer grain= =20 > control over the status of features. > > As for implementation experience IIRC Clang has something like this. > > #if __cplusplus =3D=3D 201402 > int foo() [[deprecated("This function is deprecated and will be removed= =20 > in a later")]]; > #elif __cplusplus > 201402 > int foo() [[removed("This function is removed. Use bar() instead")]]; > #endif > > What do you all think? > > Ed > > > --=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_5682_1994937747.1419508952349 Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: quoted-printable

#if __cplusplus =3D=3D 201402
  [[deprecated("This function is deprecated and will be removed in a later"= )]]
  int foo();
#elif __cplusplus > 201402
  [[deprecated("Please use bar() instead")]]
  int foo() =3D delete;=
#endif



Le jeudi 25 d=C3=A9cembre 2014 02:52:03 UTC+1, 3dw...= @verizon.net a =C3=A9crit :
Now that C++14 is out with attribute [[deprecated]] and = now that C++17 is moving forward with some removals of library features it = seems lie a good idea to at least consider a [[removed]] attribute that cou= ld take a message.  This would allow an implementation to provide stro= nger dissuasion including compilation fail than [[deprecated]].  This = allows finer grain control over the status of features.

As for imple= mentation experience IIRC Clang has something like this.

#if __cplus= plus =3D=3D 201402
  int foo() [[deprecated("This function is depre= cated and will be removed in a later")]];
#elif __cplusplus > 201402<= br>  int foo() [[removed("This function is removed.  Use bar() in= stead")]];
#endif

What do you all think?

Ed


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