220 19288 article Path: news.gmane.org!not-for-mail From: denis bider Newsgroups: gmane.comp.lang.c++.isocpp.proposals Subject: Re: Testing for supported features: Per-feature macros? Sentinel compilation? Date: Sun, 26 Jul 2015 13:35:01 -0700 (PDT) Lines: 91 Approved: news@gmane.org Message-ID: References: Reply-To: std-proposals@isocpp.org NNTP-Posting-Host: plane.gmane.org Mime-Version: 1.0 Content-Type: multipart/mixed; boundary="----=_Part_2396_838705685.1437942901705" X-Trace: ger.gmane.org 1437942914 6532 80.91.229.3 (26 Jul 2015 20:35:14 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Sun, 26 Jul 2015 20:35:14 +0000 (UTC) Cc: ville.voutilainen@gmail.com To: ISO C++ Standard - Future Proposals Original-X-From: std-proposals+bncBD5LNK7YQYJRB54I2WWQKGQESZ5EX3A@isocpp.org Sun Jul 26 22:35:14 2015 Return-path: Envelope-to: gclcip-std-proposals@m.gmane.org Original-Received: from mail-ob0-f199.google.com ([209.85.214.199]) by plane.gmane.org with esmtp (Exim 4.69) (envelope-from ) id 1ZJSdV-0002o4-Gs for gclcip-std-proposals@m.gmane.org; Sun, 26 Jul 2015 22:35:05 +0200 Original-Received: by obbtr2 with SMTP id tr2sf25263886obb.1 for ; Sun, 26 Jul 2015 13:35:04 -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:cc:message-id:in-reply-to :references: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=twYzlHi5lX8qXt5cyHAibHAPWTcol8lObCDwSjrUDIw=; b=U+9nkGa0FK6gm9QyFAjFUm5LWxgvRUbahkQcVPrU9HjnZRTkJxi8JvvSlOYCZMTZnU JP6BjGGfFzMZgVdbVh7d44pfgvCss06n2QEI46dthh5mvn6JsSXG03it7zCIyZLrgTs+ xf2qgsJ/2InIcQr28BW+71Ymf5ENBObt+0+cGTFcL7SKB35ofWYvny0eyRZ8TZn0JUwF 90KgtMvgqB18QhJxXT9ZeFv6Nc6CmGz10+UveISpHlUAgtrBd46ZRZ3eRs3DVVPtsXZL 4eJSAwfNnm9tmdcPEO7Pv/uwgSYxU7oNEEJI5KMwqpgR38PHMGGxbSrmzZZ3MbAwv4jT fyEg== X-Gm-Message-State: ALoCoQnJmrCAo5r5N/yNYadJ1nsuDpGSbE+OLW6x6wMtiCXnS6EH96jN4+U6oVmGxGP7rowoYMmW X-Received: by 10.107.131.14 with SMTP id f14mr24798762iod.19.1437942904335; Sun, 26 Jul 2015 13:35:04 -0700 (PDT) X-BeenThere: std-proposals@isocpp.org Original-Received: by 10.140.98.66 with SMTP id n60ls2518807qge.10.gmail; Sun, 26 Jul 2015 13:35:02 -0700 (PDT) X-Received: by 10.140.92.81 with SMTP id a75mr8628qge.14.1437942902869; Sun, 26 Jul 2015 13:35:02 -0700 (PDT) In-Reply-To: X-Original-Sender: isocppgroup@denisbider.com 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:19288 Archived-At: ------=_Part_2396_838705685.1437942901705 Content-Type: multipart/alternative; boundary="----=_Part_2397_863658984.1437942901705" ------=_Part_2397_863658984.1437942901705 Content-Type: text/plain; charset=UTF-8 This is nice and all, but it's a *lot* of bureaucracy for a non-general solution that needs maintenance with every new language version; and leaves out niche situations that sentinel compilation would solve (e.g. implementation differences between compilers that *claim* to implement the same feature). On Sunday, July 26, 2015 at 11:57:35 AM UTC-6, Ville Voutilainen wrote: > > On 26 July 2015 at 20:42, denis bider > wrote: > > A common issue in libraries with similar goals is how to detect that a > > particular language feature is implemented, so as to either make use of > it > > or not. Currently, in most cases, this requires testing macros for > specific > > compiler versions. > > Some implementations support these: > http://open-std.org/JTC1/SC22/WG21/docs/papers/2015/n4440.html > -- --- 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_2397_863658984.1437942901705 Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: quoted-printable
This is nice and all, but it's a lot of burea= ucracy for a non-general solution that needs maintenance with every new lan= guage version; and leaves out niche situations that sentinel compilation wo= uld solve (e.g. implementation differences between compilers that claim= to implement the same feature).

On Sunday, July 26, 2015 at 11= :57:35 AM UTC-6, Ville Voutilainen wrote:
On 26= July 2015 at 20:42, denis bider <isocp..= ..@denisbider.com> wrote:
> A common issue in libraries with similar goals is how to detect th= at a
> particular language feature is implemented, so as to either make u= se of it
> or not. Currently, in most cases, this requires testing macros for= specific
> compiler versions.

Some implementations support these:
http://open-std.org/JTC1/SC22/WG21= /docs/papers/2015/n4440.html

--

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