220 14102 <59ae3383-67a5-4a4c-b301-06cf148c9df6@isocpp.org> article Path: news.gmane.org!not-for-mail From: Christopher Newsgroups: gmane.comp.lang.c++.isocpp.proposals Subject: Re: #pragma once Date: Tue, 21 Oct 2014 14:04:00 -0700 (PDT) Lines: 77 Approved: news@gmane.org Message-ID: <59ae3383-67a5-4a4c-b301-06cf148c9df6@isocpp.org> References: <3d0ab5b0-73d9-434a-9ae4-cd47d8275590@isocpp.org> Reply-To: std-proposals@isocpp.org NNTP-Posting-Host: plane.gmane.org Mime-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_Part_942_342251634.1413925440498" X-Trace: ger.gmane.org 1413925450 28585 80.91.229.3 (21 Oct 2014 21:04:10 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Tue, 21 Oct 2014 21:04:10 +0000 (UTC) To: std-proposals@isocpp.org Original-X-From: std-proposals+bncBCHINCHEQEFBBQMUTORAKGQEWTZCLQA@isocpp.org Tue Oct 21 23:04:03 2014 Return-path: Envelope-to: gclcip-std-proposals@m.gmane.org Original-Received: from mail-pd0-f200.google.com ([209.85.192.200]) by plane.gmane.org with esmtp (Exim 4.69) (envelope-from ) id 1Xggb4-0004DB-Sa for gclcip-std-proposals@m.gmane.org; Tue, 21 Oct 2014 23:04:03 +0200 Original-Received: by mail-pd0-f200.google.com with SMTP id ft15sf10055988pdb.3 for ; Tue, 21 Oct 2014 14:04:01 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=date:from:to:message-id:in-reply-to:references:subject:mime-version :x-original-sender:reply-to:precedence:mailing-list:list-id :list-post:list-help:list-archive:list-subscribe:list-unsubscribe :content-type; bh=5uyBXUbDNBKAUiGMbtfYYcrHy7gRqCHHBVB7n9esywk=; b=ZSAqWvlAruWS4epPrzhiV5GALyX87EfgzGiWX5Me7DUukdBdynFAkdlJ3U6CT53wdM biqsnBMpobZX5kMA2GTo9ie6OO+HFG09+nUDh+bqxmlyD36WWNYDqKQvqzPuulOcoxc3 w15bM6DpOf/OuwyoZMvatTAvwOnyXK+9plb3nG7oL96TFJbBrxKmIWOJgT2kJdbgGvXk HErt0Um82MQ3rXR6YrVdqZQ8BVbqbFmB/tU5PIJfBkUKVPJMVYiiQlnS7AYOG1XP5hBq FdgrPgRiK7iLoxEELylDzh+NXWuN+W3RqAECFn4Gs4cu1XKRjqO8HH24hCLO6VuBsliR V2AQ== 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:in-reply-to:references :subject:mime-version:x-original-sender:reply-to:precedence :mailing-list:list-id:list-post:list-help:list-archive :list-subscribe:list-unsubscribe:content-type; bh=5uyBXUbDNBKAUiGMbtfYYcrHy7gRqCHHBVB7n9esywk=; b=WsC/xAPiSiLZCZGR9y0eVR2P0B6b32RI9z+fCvjW9SBYcK6y14zJgvVjyx8o14joGM hhTV/0zLm1W1X/0+PdP8F5CwgLDXySb3v4b0S8UqrLZQE3YPa4bq42awV+yS0BBd8kbd QVgpvLVc6Fb8kOFfT7tbxnkXFv1+4KMhadPnt07MLnLIj27ACQB0e2RExWGh/HZVIznb 4Cyw3SoARaB/EDb6WphHpE3w3F6La052h4b0qXsz9RgtpNx4dy+M3B8gT+LEt5tj1uJU ZNETAkXHz/DOE6ux1yChEtZIp3QgTvE8a7b5VsPK5ME5NhlP9Ob2b+XA8TUQD6Q5PvWR hNJg== X-Gm-Message-State: ALoCoQndclX7Qf4gDD5ofcToKqGQHfYxHYeuzxuIa+P8AabcnN1y/MT6CHTurHabOKn+rwmFmmxm X-Received: by 10.66.66.196 with SMTP id h4mr910308pat.26.1413925441724; Tue, 21 Oct 2014 14:04:01 -0700 (PDT) X-BeenThere: std-proposals@isocpp.org Original-Received: by 10.140.96.16 with SMTP id j16ls514686qge.20.gmail; Tue, 21 Oct 2014 14:04:01 -0700 (PDT) X-Received: by 10.140.91.4 with SMTP id y4mr56808qgd.14.1413925440950; Tue, 21 Oct 2014 14:04:00 -0700 (PDT) In-Reply-To: <3d0ab5b0-73d9-434a-9ae4-cd47d8275590@isocpp.org> X-Original-Sender: christopherhallock@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:14102 Archived-At: ------=_Part_942_342251634.1413925440498 Content-Type: text/plain; charset=UTF-8 > > By the way, why don't _Pragma and #line support concatenating multiple > strings in their respective string parameters? > String concatenation happens later (Phase 6). For _Pragma, this is not too bad if you're willing to build up *unquoted *pp-tokens and pass them to a wrapper-macro: #define RAW_TOKENS_PRAGMA2(...) _Pragma(#__VA_ARGS__) #define RAW_TOKENS_PRAGMA(...) RAW_TOKENS_PRAGMA2(__VA_ARGS__) -- --- 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_942_342251634.1413925440498 Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: quoted-printable
By the way, why don't _Pragma and #line= support concatenating multiple strings in their respective string p= arameters?

String concatenation happens late= r (Phase 6). For _Pragma, this is not too bad if you're willing to build up= unquoted pp-tokens and pass them to a wrapper-macro:

#define RAW= _TOKENS_PRAGMA2(...) &n= bsp;_Pragma(#__VA_AR= GS__)
<= /span>#define RAW_TOKENS_PR= AGMA(...)<= /span>   RAW= _TOKENS_PRAGMA2(__VA= _ARGS__)

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