220 29391 <7d99e4bd-5ae1-4615-96dd-c8849487c007@isocpp.org> article Path: news.gmane.org!.POSTED!not-for-mail From: billconan@gmail.com Newsgroups: gmane.comp.lang.c++.isocpp.proposals Subject: Re: why not formally support meta programming. Date: Wed, 9 Nov 2016 17:11:00 -0800 (PST) Lines: 58 Approved: news@gmane.org Message-ID: <7d99e4bd-5ae1-4615-96dd-c8849487c007@isocpp.org> References: <668e0a04-c988-4354-ae32-30f626f75403@isocpp.org> Reply-To: std-proposals@isocpp.org NNTP-Posting-Host: blaine.gmane.org Mime-Version: 1.0 Content-Type: multipart/mixed; boundary="----=_Part_235_1414745408.1478740260669" X-Trace: blaine.gmane.org 1478740283 4334 195.159.176.226 (10 Nov 2016 01:11:23 GMT) X-Complaints-To: usenet@blaine.gmane.org NNTP-Posting-Date: Thu, 10 Nov 2016 01:11:23 +0000 (UTC) Cc: billconan@gmail.com To: ISO C++ Standard - Future Proposals Original-X-From: std-proposals+bncBD7JLV7X6MLRBJ4SR7AQKGQEGEXRQBY@isocpp.org Thu Nov 10 02:11:19 2016 Return-path: Envelope-to: gclcip-std-proposals@m.gmane.org Original-Received: from mail-vk0-f72.google.com ([209.85.213.72]) by blaine.gmane.org with esmtp (Exim 4.84_2) (envelope-from ) id 1c4dtM-0007R6-Mm for gclcip-std-proposals@m.gmane.org; Thu, 10 Nov 2016 02:11:00 +0100 Original-Received: by mail-vk0-f72.google.com with SMTP id p9sf179847586vkd.7 for ; Wed, 09 Nov 2016 17:11:04 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=isocpp-org.20150623.gappssmtp.com; s=20150623; h=date:from:to:cc:message-id:in-reply-to:references:subject :mime-version: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=+ShdjF/Yh43tHlNhKCCOvTQ0ifS504sh00o/oDP6e6k=; b=eFEn7ss3JnGDBT7ChYgi7JVfEuPeXv/F6Lo74F+z61BJd+0i2YbKzMMR9FU7LFaVUo 8DG8fZ7aCuDngcjXUvM8TtBAs6OfMNB4pgTKpVwU7xbmitl1fbNZWwOCqd/ctMVaYunu hfhEhzQDaLQBMiH9BbekgvgO71uCyonN0kItkOrT+KfvN+Z9SgnMTzSA0osBN3w2hnKE YfwTc4UmfjRssow8j566bIpdih+e/z8mvw6uTrCrxfhfxX3GjgXLpjz14lM22ALUe7CT rLQDV09/KD2xWWcCZUMd4S2y31JhWff8quiYCCcLpi4nnNyw3l4qZCTvoSD1V4N2jaUX 6oOg== 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: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=+ShdjF/Yh43tHlNhKCCOvTQ0ifS504sh00o/oDP6e6k=; b=Ut0FF8fFLHAuq3ieLjJfoy6JA5WslyjhgdkcC2EGkN9/gxFFPWhCzGaDhSZt2ES5Oe eZo9rUhtpd05KEt1OJzBY+/OlPCqBsEh9nfDz7DdasNyiL8EIfB83FMeSNlGSwsfDM+L XFXpXsbkk6sg3t7KSebrSZhoh4ZnxlsfGUKIkZdowTvV9bX9lUFCZLkWTlpdcrzEtmD5 4e3PJqmVVNsaawfR4K/LtQCKeXkpiwC8gYdZrxmUNF3k8QAB1wQKgOVlL+qKbIINDq1f 5G9kylXvZHh/8o7wlqzv5TCrQlbmp+q89oOsDQsqbOvZJ2bLb7ppKm43WIlpK32rU0pp quuw== 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: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=+ShdjF/Yh43tHlNhKCCOvTQ0ifS504sh00o/oDP6e6k=; b=eCxjxPkPBrwQzyqNm3RNfGi5AoLqJ5DxKfx1rAzloyPfE38zXG21daupSXLpTYZagF amE7u5BPh06U5JpWERAmWK4s632oF2gBTafbkdAq649A+FNbZEabwjNeD2rMCyTL2FE1 t8Lc6G6Fvucg/ib08SL6+nDVjk6qNqigN7XNA0UoJhwfrjrGYI5cFZtiKmnT3QKoOd4k 0dyf2vvhBpquCainWmtwdyuXwrUJeIx7KAXbujgcbiLAHY/UxtsjbghCHOwNmJ3eRJDO GV4h2ABK9WA/yoK7KJ0B8dVHjRKodvNLV8Vshhp5jIHY49zu7uWSHshNiRJ1STadqPpf /YWw== X-Gm-Message-State: ABUngvciDeroej8LoD6/ECzN1g4khp2sGt1G8rPoZhfvftYlP7bPveg8bSEHaqq16EooMg== X-Received: by 10.159.39.225 with SMTP id b88mr93006uab.27.1478740263705; Wed, 09 Nov 2016 17:11:03 -0800 (PST) X-BeenThere: std-proposals@isocpp.org Original-Received: by 10.157.27.206 with SMTP id v14ls1161152otv.2.gmail; Wed, 09 Nov 2016 17:11:02 -0800 (PST) X-Received: by 10.157.37.247 with SMTP id q110mr410399ota.5.1478740262949; Wed, 09 Nov 2016 17:11:02 -0800 (PST) In-Reply-To: X-Original-Sender: billconan@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:29391 Archived-At: ------=_Part_235_1414745408.1478740260669 Content-Type: multipart/alternative; boundary="----=_Part_236_1408898733.1478740260669" ------=_Part_236_1408898733.1478740260669 Content-Type: text/plain; charset=UTF-8 Thank you, this is indeed a cleaner solution. but is if constexpr available with any compiler today? event prerelease compiler, I'd like to try. On Wednesday, November 9, 2016 at 4:45:17 PM UTC-8, Nicol Bolas wrote: > > A combination of `if constexpr` and template specialization can handle > what you're doing: > > -- 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. To view this discussion on the web visit https://groups.google.com/a/isocpp.org/d/msgid/std-proposals/7d99e4bd-5ae1-4615-96dd-c8849487c007%40isocpp.org. ------=_Part_236_1408898733.1478740260669 Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: quoted-printable
Thank you, this is indeed a cleaner solution.

but is if constexpr available with any compiler today? event prerele= ase compiler, I'd like to try.

On Wednesday, November 9, 2016 at= 4:45:17 PM UTC-8, Nicol Bolas wrote:
A combination of `if constexpr` and template specia= lization can handle what you're doing:

--
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