220 8156 article Path: news.gmane.org!not-for-mail From: Zhihao Yuan Newsgroups: gmane.comp.lang.c++.isocpp.proposals Subject: Re: A compile-time string literal library type Date: Tue, 17 Dec 2013 23:42:53 -0500 Lines: 39 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: text/plain; charset=ISO-8859-1 X-Trace: ger.gmane.org 1387341783 7364 80.91.229.3 (18 Dec 2013 04:43:03 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Wed, 18 Dec 2013 04:43:03 +0000 (UTC) To: "std-proposals@isocpp.org" Original-X-From: std-proposals+bncBCSKRWMD4EHBBW6PYSKQKGQECUABDLY@isocpp.org Wed Dec 18 05:43:10 2013 Return-path: Envelope-to: gclcip-std-proposals@m.gmane.org Original-Received: from mail-ie0-f197.google.com ([209.85.223.197]) by plane.gmane.org with esmtp (Exim 4.69) (envelope-from ) id 1Vt8yS-0007cf-U1 for gclcip-std-proposals@m.gmane.org; Wed, 18 Dec 2013 05:43:09 +0100 Original-Received: by mail-ie0-f197.google.com with SMTP id e14sf25650178iej.8 for ; Tue, 17 Dec 2013 20:43:07 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:mime-version:in-reply-to:references:date :message-id:subject:from:to:sender:x-original-sender :x-original-authentication-results:reply-to:precedence:mailing-list :list-id:list-post:list-help:list-archive:list-subscribe :list-unsubscribe:content-type; bh=k4HG9BHwKz0ioIJfyQawcH5fBKkLEfqvOeWkNlSFmQM=; b=i1qlNF3miOcRGWgFqdg9hcph3IwMGUHP7F71LsXe0IkDywT9lPuYNwSyNAfhEKvsB7 CtW85GvDMIcT2xEa1A/xszw0WA3lip/ewEUYkzY7k44D58z9KXlmspt+MOKIr89bIE8c slcbV1xY0sfisnP1EWj2bB15xxvIWVaPhg2/8YAHHBZq0yiwmOm0p6guF1IMOmM4oaPu TBcDfbeMIyRR36U7H7pqqjFQgE9TCqFBdSpwTtNygUEAALs5v8/QO4EUs4u1OZqfaAEH wQJrjpln288uES0vpOyBvJup07LNVM3lYySkwj83JNzfvSgrohj9JasHYq4p87InY1Lz tB4g== X-Gm-Message-State: ALoCoQlt1V37HI09lyAjTp/T60MxlFgjNdr8b49+XkFuB7llK3/aIyJIMthUe2HpTT/G88zwAZaF X-Received: by 10.42.112.2 with SMTP id w2mr8332951icp.14.1387341787763; Tue, 17 Dec 2013 20:43:07 -0800 (PST) X-BeenThere: std-proposals@isocpp.org Original-Received: by 10.49.12.241 with SMTP id b17ls2828512qec.11.gmail; Tue, 17 Dec 2013 20:43:07 -0800 (PST) X-Received: by 10.224.124.74 with SMTP id t10mr49925388qar.40.1387341787026; Tue, 17 Dec 2013 20:43:07 -0800 (PST) Original-Received: from mail-s68.mailgun.info (mail-s68.mailgun.info. [184.173.153.196]) by mx.google.com with ESMTP id b3si16298899qab.93.2013.12.17.20.43.06 for ; Tue, 17 Dec 2013 20:43:06 -0800 (PST) Received-SPF: pass (google.com: domain of bounce+3f9131.69110-std-proposals=isocpp.org@miator.net designates 184.173.153.196 as permitted sender) client-ip=184.173.153.196; Original-Received: from mail-vb0-f41.google.com (mail-vb0-f41.google.com [209.85.212.41]) by mxa.mailgun.org with ESMTP id 52b127cd.6a931b0-in1; Wed, 18 Dec 2013 04:42:53 -0000 (UTC) Original-Received: by mail-vb0-f41.google.com with SMTP id p14so3171821vbm.28 for ; Tue, 17 Dec 2013 20:42:53 -0800 (PST) X-Received: by 10.58.155.162 with SMTP id vx2mr10108veb.46.1387341773109; Tue, 17 Dec 2013 20:42:53 -0800 (PST) Original-Received: by 10.221.73.199 with HTTP; Tue, 17 Dec 2013 20:42:53 -0800 (PST) In-Reply-To: X-Mailgun-Sid: WyI3MTBkYiIsICJzdGQtcHJvcG9zYWxzQGlzb2NwcC5vcmciLCAiNjkxMTAiXQ== Original-Sender: zy@miator.net X-Original-Sender: zy@miator.net X-Original-Authentication-Results: mx.google.com; spf=pass (google.com: domain of bounce+3f9131.69110-std-proposals=isocpp.org@miator.net designates 184.173.153.196 as permitted sender) smtp.mail=bounce+3f9131.69110-std-proposals=isocpp.org@miator.net; dkim=pass header.i=@miator.net 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:8156 Archived-At: On Tue, Dec 17, 2013 at 10:45 PM, Michael Price - Dev wrote: > constexpr auto library_name = "BEST"_cs; > constexpr auto static_prefix = library_name + ": "_cs; > > static_assert(false, static_prefix + "Oops, did I say false"); // would This can be build based on same technique of std::array; you really don't need string literal those different in content to have different types. And they actually meet your requirements better, because after being built at compile-time, std::array based string can be modified at runtime. Metaparse is cool, but think about it: all compilers can parse at compiler time, and you want to parse at compile time, then why you write yet-another parser? If you want a rich interface, I think this is a good solution: http://static.rust-lang.org/doc/0.6/tutorial-macros.html if you just want a symbol table, then just ask compiler to expose its symbol table... -- Zhihao Yuan, ID lichray The best way to predict the future is to invent it. ___________________________________________________ 4BSD -- http://4bsd.biz/ -- --- 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. 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