220 17362 <96b876e7-1ee0-41de-8ca9-842ef38206f3@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: N4461 (Static if resurrected) -- on implementability Date: Thu, 16 Apr 2015 02:58:39 -0700 (PDT) Lines: 66 Approved: news@gmane.org Message-ID: <96b876e7-1ee0-41de-8ca9-842ef38206f3@isocpp.org> Reply-To: std-proposals@isocpp.org NNTP-Posting-Host: plane.gmane.org Mime-Version: 1.0 Content-Type: multipart/mixed; boundary="----=_Part_6992_627655005.1429178319705" X-Trace: ger.gmane.org 1429178330 26289 80.91.229.3 (16 Apr 2015 09:58:50 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Thu, 16 Apr 2015 09:58:50 +0000 (UTC) To: std-proposals@isocpp.org Original-X-From: std-proposals+bncBDT2DGOJ34DBBUEPX2UQKGQE24U3NNQ@isocpp.org Thu Apr 16 11:58:46 2015 Return-path: Envelope-to: gclcip-std-proposals@m.gmane.org Original-Received: from mail-yh0-f69.google.com ([209.85.213.69]) by plane.gmane.org with esmtp (Exim 4.69) (envelope-from ) id 1YigZG-0006e0-55 for gclcip-std-proposals@m.gmane.org; Thu, 16 Apr 2015 11:58:42 +0200 Original-Received: by yhhg46 with SMTP id g46sf10164417yhh.2 for ; Thu, 16 Apr 2015 02:58:41 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=date:from:to:message-id: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=uNOPjhPgGdkvmb5nqu/6P2WF5UgsbiFB/QmlGZ7Kt54=; b=FLjErzJH9JVn42vhma9UVltNTVOyOkOp8EDiFjHjS1k9782N+wvm6fnVe91yl48nYT fFMeAWXRcOZQcMUXw7rNfilV8wQN7hTZAAaTwPJD+xFJKsLw+/b67DXbrfe5q/kJztJo bWfEWg+5jPgcWwdLWm2EWn+Xb9bjW6Hy4o5ExUGzPZG51gbLezmzJ+Aqkt7NJS4AgyWM Gu4katW9o2G3qVujixMafRsZ7ay0mVP+SBUXPaE/K7fah1xGF9PxQWMUdUYRJF7rinmP UzphF+PFhrg5gksQrNXF2UBMIdxXOOq2Nc4O/xUTQz0o9jTUAeyuGSBCbb8PyW27h8xe pldg== 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: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=uNOPjhPgGdkvmb5nqu/6P2WF5UgsbiFB/QmlGZ7Kt54=; b=BBKD+MyKcTJSmb0R+g0j9gGsAKT3uXYlGBdY6tU/+vmOiO0dXBU+jEjcpVhJQR2J2F Jy8/5Zg7qTmEZblWpBosS2cmC502V5kiBL7WNNK1/JQSLSFkWlia141Gapt8rPCefo9J UX/V44oiKCBxHiRDpNrzDT6lD/eRSaSgM0CUBvrEMLBbr2UyJ9ZUVIp1JBQun0wVCFmM DNw+YoQ7sNYPkSztd3Q8h79/kbpSI7rSh3+YAPYWYyY9940vqW6uvyTx3Gt3gVAxSECw PeSmR0m1dBwmQSI6AeYDBepLa9DOh8gETKHhHFvXuUx3HdBccek5vv2kqc+R1XH8IAiZ SCYg== X-Gm-Message-State: ALoCoQkoQjMBMrmTVwlobsQLTPRFQ//xa95fbAWpTwm1zwOXO9AFbtFoRgfTyU4CNrw5gBXo6GAq X-Received: by 10.140.151.85 with SMTP id 82mr40478295qhx.1.1429178321042; Thu, 16 Apr 2015 02:58:41 -0700 (PDT) X-BeenThere: std-proposals@isocpp.org Original-Received: by 10.140.38.81 with SMTP id s75ls1142854qgs.29.gmail; Thu, 16 Apr 2015 02:58:40 -0700 (PDT) X-Received: by 10.140.98.116 with SMTP id n107mr393765qge.11.1429178320359; Thu, 16 Apr 2015 02:58:40 -0700 (PDT) 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:17362 Archived-At: ------=_Part_6992_627655005.1429178319705 Content-Type: multipart/alternative; boundary="----=_Part_6993_557994971.1429178319705" ------=_Part_6993_557994971.1429178319705 Content-Type: text/plain; charset=UTF-8 Hi All, I think that the "implementability" section of the paper on reduced static if proposal is too pessimistic. I tried to implement the two examples from "Motivation" section in C++14 with generic lambdas using the technique indicated by Paul Fultz II here: http://www.reddit.com/r/cpp/comments/295e77/clever_overloading_andrzejs_c_blog/ You can see the result here: http://melpon.org/wandbox/permlink/ub4qmpDyIzkZWP1x While the syntax is obviously more ugly than what the paper describes, I believe the result is achievable in C++14 already. The compiler would only need to mechanically transform one notation into another. Regards, &rzej -- --- 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_6993_557994971.1429178319705 Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: quoted-printable
Hi All,
I think that the "implementability" section of = the paper on reduced static if proposal is too pessimistic. I tried to impl= ement the two examples from "Motivation" section in C++14 with generic lamb= das using the technique indicated by Paul Fultz II here: http://www.reddit.= com/r/cpp/comments/295e77/clever_overloading_andrzejs_c_blog/

You ca= n see the result here: http://melpon.org/wandbox/permlink/ub4qmpDyIzkZWP1x<= br>
While the syntax is obviously more ugly than what the paper describe= s, I believe the result is achievable in C++14 already. The compiler would = only need to mechanically transform one notation into another.

Regar= ds,
&rzej

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