220 31176 article Path: news.gmane.org!.POSTED!not-for-mail From: Faisal Vali Newsgroups: gmane.comp.lang.c++.isocpp.proposals Subject: Re: Removing forward references ("universal" references) from the standard Date: Sun, 26 Feb 2017 13:32:50 -0600 Lines: 68 Approved: news@gmane.org Message-ID: References: <218337af-618b-4136-e864-615d9b153c1e@wanadoo.fr> Reply-To: std-proposals@isocpp.org NNTP-Posting-Host: blaine.gmane.org Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8 X-Trace: blaine.gmane.org 1488137607 17640 195.159.176.226 (26 Feb 2017 19:33:27 GMT) X-Complaints-To: usenet@blaine.gmane.org NNTP-Posting-Date: Sun, 26 Feb 2017 19:33:27 +0000 (UTC) To: "" Original-X-From: std-proposals+bncBDDKRIXX5YARBAO3ZTCQKGQEDIDJHEY@isocpp.org Sun Feb 26 20:33:22 2017 Return-path: Envelope-to: gclcip-std-proposals@m.gmane.org Original-Received: from mail-pf0-f199.google.com ([209.85.192.199]) by blaine.gmane.org with esmtp (Exim 4.84_2) (envelope-from ) id 1ci4ZI-0003cm-UB for gclcip-std-proposals@m.gmane.org; Sun, 26 Feb 2017 20:33:17 +0100 Original-Received: by mail-pf0-f199.google.com with SMTP id j5sf109377218pfb.3 for ; Sun, 26 Feb 2017 11:33:23 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=isocpp-org.20150623.gappssmtp.com; s=20150623; h=mime-version:reply-to:in-reply-to:references:from:date:message-id :subject:to:x-original-sender:x-original-authentication-results :precedence:mailing-list:list-id:x-spam-checked-in-group:list-post :list-help:list-archive:list-subscribe:list-unsubscribe; bh=2ax3lI+vOmUR34HEoGcGiYucguLjf1/sipOWF5tK1FA=; b=RZ4+llhCkVLCE4aRbICQTelZXbhbNezHl3lqqJGIcBam4NcZ/wgwqmUHmIBfm+n8g9 P9U+6ZlybYu/bKVhjyGBFiSTvDehYWJSO6hR2icE35Z+1sBhS0biwzq7LfGTP3UU/2sv z1cZf8ojYWTjRpnvRB33GpoMekjr2Cm1YyvEbwSTbjh9igVHRimMnnu0jXESBnWr4Fnb 5Ru2aPWEhzd2V2DwQaQWN92wNEywpTSjXCWi2sb2pvIAFM7PLp3cHwk6QKxHLB/wtcjd HGrJrqeBDZ82bghVbXg+1pp2bsuwLWN+SpUbWUI+VPt3jpCLsRF2hMJsC1DZ0Yw+6GMF GUuA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:reply-to:in-reply-to:references :from:date:message-id:subject:to:x-original-sender :x-original-authentication-results:precedence:mailing-list:list-id :x-spam-checked-in-group:list-post:list-help:list-archive :list-subscribe:list-unsubscribe; bh=2ax3lI+vOmUR34HEoGcGiYucguLjf1/sipOWF5tK1FA=; b=QAnXgwNi/MtW/sSyILCDbotgCfaecg61ew7IBHjZpK3radutVMnRXPbwspNFmSX13a MixYDA94jzJyyScdDsFgMqW+m2/fulsW3KslFTyJ2jHkzbRjDKVhyoxNqVd7LfamaE5/ zmgU0J9H9gHwVWsYRslQoAcaVjDPO63HVEDF72tiDFZB1xHH+uhBay7wiML93bib4RU3 +zc/4OocXrLr6YR6CypLFNkepOUmlctZvhGQy4H5vqUhNZ4aslZa5HsZmJfUjV2K5Bzn UKRX4yV4ClgghgAEo7+XjpOo84nUbd1hVR7dMXIpBJOGdKCouAfp7ycORxynF+16fB/u rB3Q== X-Gm-Message-State: AMke39lyGEL5OqeNRSGTg3CTxktJOZSW6oOu3BflLLtc0t6l5PF8JvZItz7gh0XToqdyng== X-Received: by 10.99.123.72 with SMTP id k8mr4850868pgn.110.1488137602361; Sun, 26 Feb 2017 11:33:22 -0800 (PST) X-BeenThere: std-proposals@isocpp.org Original-Received: by 10.157.10.196 with SMTP id 62ls12148596otq.7.gmail; Sun, 26 Feb 2017 11:33:21 -0800 (PST) X-Received: by 10.157.43.235 with SMTP id u98mr2055729ota.20.1488137601771; Sun, 26 Feb 2017 11:33:21 -0800 (PST) Original-Received: from mail-ot0-x22d.google.com (mail-ot0-x22d.google.com. [2607:f8b0:4003:c0f::22d]) by mx.google.com with ESMTPS id l63si5459256oia.176.2017.02.26.11.33.21 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Sun, 26 Feb 2017 11:33:21 -0800 (PST) Received-SPF: pass (google.com: domain of faisalv@gmail.com designates 2607:f8b0:4003:c0f::22d as permitted sender) client-ip=2607:f8b0:4003:c0f::22d; Original-Received: by mail-ot0-x22d.google.com with SMTP id x10so40680578otb.1 for ; Sun, 26 Feb 2017 11:33:21 -0800 (PST) X-Received: by 10.157.17.8 with SMTP id g8mr6000347ote.251.1488137601384; Sun, 26 Feb 2017 11:33:21 -0800 (PST) Original-Received: by 10.157.56.235 with HTTP; Sun, 26 Feb 2017 11:32:50 -0800 (PST) In-Reply-To: X-Original-Sender: faisalv@gmail.com X-Original-Authentication-Results: mx.google.com; dkim=pass header.i=@gmail.com; spf=pass (google.com: domain of faisalv@gmail.com designates 2607:f8b0:4003:c0f::22d as permitted sender) smtp.mailfrom=faisalv@gmail.com; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=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:31176 Archived-At: On Sun, Feb 26, 2017 at 1:13 PM, Brittany Friedman wrote: > > > On Sun, Feb 26, 2017 at 12:57 PM, Faisal Vali wrote: >> >> >> For e.g. instead of writing the following overloads: >> >> template int* f(T&&); // ugh - be careful, can bind to both r >> and lval >> template char* f(T&); >> >> You could write the following: >> >> // Write this as if it only handles Rvalues >> template struct f { >> int *ret; >> f(T&& t) { ret = ... } >> operator int*() { return ret; } >> }; >> template f(T&) -> f; >> >> // ... likewise for Lvalues >> template struct f { >> char *ret; >> f(T& t) { ret = ... } >> operator char*() { return ret; } >> }; >> >> int i; >> char *lval = f(i); >> int *rval = f(0); >> >> I know what you're thinking, because i'm thinking it too: "C++ - why >> do you keep sleeping (and with whom ;) through the class on the KISS >> principle?" >> -faisal > > > If you think that your 11 lines of code is simpler than the 2 lines of code > you started with then we have very different definitions of simple. > ?!? My sarcastic post and denouement regarding C++ evolution was meant as an indictment of having to even consider those 11 lines of code (as opposed to the two) as a potential solution. (Does having to explain sarcasm, suggest a failure in one's ability to wield it? I guess, like C++, the practice of sardonicity isn't as simple as one would like it to be;) > -- > 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/CADbh%2BeSuRMxSDo3ubh4R78Q1_LuYEgnaZ5t0gceSKCk3m3622w%40mail.gmail.com. -- You received this message because you are subscribed to the Google Groups "ISO C++ Standard - Future Proposals" group. 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