220 36936 article Path: news.gmane.org!.POSTED!not-for-mail From: Jake Arkinstall Newsgroups: gmane.comp.lang.c++.isocpp.proposals Subject: Re: String interpolation Date: Fri, 16 Feb 2018 02:52:48 +0000 Lines: 68 Approved: news@gmane.org Message-ID: References: <356d5835-f1bf-4699-94f5-0b2d3d0b9c0e@isocpp.org> <25CCF885-86AD-4D51-8F5C-C46376D34DE0@gmail.com> <4890431.TR9UepuQra@tjmaciei-mobl1> <1cdb6300-7397-46d7-bce9-62e6e8dac40b@isocpp.org> <4bce681e-e729-4124-9322-69291fdb6678@isocpp.org> <758ab0a7-8946-43d4-b2ae-5a4acea11c20@isocpp.org> <01057924-056c-4ee5-a19c-e070d053b982@isocpp.org> <3a738e91-f935-4d11-ab6b-771048b556d4@isocpp.org> <96860b9e-95ea-466a-825c-c371844a45e2@isocpp.org> <0caab177-cf57-cab1-a5d5-0fc65f651491@gmail.com> <7b1c3d63-d534-44d2-b4e9-fc0df135fff5@isocpp.org> Reply-To: std-proposals@isocpp.org NNTP-Posting-Host: blaine.gmane.org Mime-Version: 1.0 Content-Type: multipart/alternative; boundary="001a113e500c8ac3c305654b70d2" X-Trace: blaine.gmane.org 1518749464 3464 195.159.176.226 (16 Feb 2018 02:51:04 GMT) X-Complaints-To: usenet@blaine.gmane.org NNTP-Posting-Date: Fri, 16 Feb 2018 02:51:04 +0000 (UTC) To: std-proposals@isocpp.org Original-X-From: std-proposals+bncBDCZX3WUUQFRBAMPTHKAKGQE6D5T75Q@isocpp.org Fri Feb 16 03:51:00 2018 Return-path: Envelope-to: gclcip-std-proposals@m.gmane.org Original-Received: from mail-oi0-f71.google.com ([209.85.218.71]) by blaine.gmane.org with esmtp (Exim 4.84_2) (envelope-from ) id 1emW6r-00082A-Sx for gclcip-std-proposals@m.gmane.org; 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[209.85.220.41]) by mx.google.com with SMTPS id p5sor1132153oth.163.2018.02.15.18.52.49 for (Google Transport Security); Thu, 15 Feb 2018 18:52:49 -0800 (PST) Received-SPF: pass (google.com: domain of jake.arkinstall@gmail.com designates 209.85.220.41 as permitted sender) client-ip=209.85.220.41; X-Received: by 10.157.26.66 with SMTP id u2mr3788360otu.371.1518749568646; Thu, 15 Feb 2018 18:52:48 -0800 (PST) Original-Received: by 10.168.151.129 with HTTP; Thu, 15 Feb 2018 18:52:48 -0800 (PST) Original-Received: by 10.168.151.129 with HTTP; Thu, 15 Feb 2018 18:52:48 -0800 (PST) In-Reply-To: <7b1c3d63-d534-44d2-b4e9-fc0df135fff5@isocpp.org> X-Original-Sender: jake.arkinstall@gmail.com X-Original-Authentication-Results: mx.google.com; dkim=pass header.i=@gmail.com header.s=20161025 header.b=MwSPJPxU; spf=pass (google.com: domain of jake.arkinstall@gmail.com designates 209.85.220.41 as permitted sender) smtp.mailfrom=jake.arkinstall@gmail.com; dmarc=pass (p=NONE sp=QUARANTINE dis=NONE) header.from=gmail.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:36936 Archived-At: --001a113e500c8ac3c305654b70d2 Content-Type: text/plain; charset="UTF-8" On 16 Feb 2018 01:32, "Nicol Bolas" wrote: My feeling is that you have to pick one or the other: you either allow arbitrary expressions or you allow constexpr string interpolation. And if we can only have one, I'd much rather have the latter. I want constexpr strings to be equivalent to literals as much as possible. I agree here. We can get something along the lines of an addition operator that acts in the same way as concatenation - so we could have your example by performing the interpolation and concatenating the results, but in terms of e.g. allowing some constexpr string replacement, or other more advanced string processing, I think it just adds more implementation complexity and it could lead to some pretty dodgy practices (though it would be a code obfuscator's goldmine). -- 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/CAC%2B0CCMFDUop3ceSBh%2B39%2BGYq%2BeVRDLC4iSfCdauNc%3DO8A%3DwWQ%40mail.gmail.com. --001a113e500c8ac3c305654b70d2 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
On 16 Feb 2018 01:32, "Nicol Bolas" <jmckesson@gmail.com> wrote:
My feeling is that you have to pick one or the other: you either allow=20 arbitrary expressions or you allow constexpr string interpolation. And=20 if we can only have one, I'd much rather have the latter.
I want constexpr strings to be equivalent to literals as much as possible.=

I agree here. We can get something along the lines of an addition= operator that acts in the same way as concatenation - so we could have you= r example by performing the interpolation and concatenating the results, bu= t in terms of e.g. allowing some constexpr string replacement, or other mor= e advanced string processing, I think it just adds more implementation comp= lexity and it could lead to some pretty dodgy practices (though it would be= a code obfuscator's goldmine).

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