220 33776 <9979b017-fc21-445f-a1d1-0f55f8e7bf3d@isocpp.org> article Path: news.gmane.org!.POSTED!not-for-mail From: Nicol Bolas Newsgroups: gmane.comp.lang.c++.isocpp.proposals Subject: Re: properties? Date: Wed, 9 Aug 2017 23:19:00 -0700 (PDT) Lines: 110 Approved: news@gmane.org Message-ID: <9979b017-fc21-445f-a1d1-0f55f8e7bf3d@isocpp.org> References: <6ed2bd55-5538-418f-8f1a-263a9958babd@isocpp.org> Reply-To: std-proposals@isocpp.org NNTP-Posting-Host: blaine.gmane.org Mime-Version: 1.0 Content-Type: multipart/mixed; boundary="----=_Part_471_293108276.1502345940075" X-Trace: blaine.gmane.org 1502345945 18109 195.159.176.226 (10 Aug 2017 06:19:05 GMT) X-Complaints-To: usenet@blaine.gmane.org NNTP-Posting-Date: Thu, 10 Aug 2017 06:19:05 +0000 (UTC) Cc: bop@gmb.dk To: ISO C++ Standard - Future Proposals Original-X-From: std-proposals+bncBCEKFTV6ZUMBBVHVV7GAKGQEB3FRP2Q@isocpp.org Thu Aug 10 08:18:57 2017 Return-path: Envelope-to: gclcip-std-proposals@m.gmane.org Original-Received: from mail-pf0-f198.google.com ([209.85.192.198]) by blaine.gmane.org with esmtp (Exim 4.84_2) (envelope-from ) id 1dfgo4-0004BW-GQ for gclcip-std-proposals@m.gmane.org; Thu, 10 Aug 2017 08:18:56 +0200 Original-Received: by mail-pf0-f198.google.com with SMTP id r187sf84417590pfr.8 for ; Wed, 09 Aug 2017 23:19:02 -0700 (PDT) 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:list-post:list-help:list-archive:list-subscribe :list-unsubscribe; bh=r3d4Ods1ylQYesbckzjGkK6Ii9x+0VEZjPsE4TrFn+o=; b=wDBI0mnm2xVYW+y64ChuorUTs7XtIEAGjLI/GvhjewhsluZ2RuFzCHD1peXW12epCA EHA5j4c2tn/GJwee9cWfQ/LGLd13n6UNBKjcf/guPW7zDTOfEMHiLEvBReypEut/njDS fz5OwISbR3bJ9tW0giyHBY5BH7+jlMLT6m/Uxwei425PSIGm6CL5Iyq9bzTpKeU3gq3F pA6HnK3Xi2eWMyKw854qaLlb1cRS0A/m3DINNaHlwz/nplGFyfvlLcL3bMULYNhN3PW/ 80VbNTFy78XtwqEnM4ze+CcVA2LFwb6bfzRO4MuPGjSwGPTPy4iqaRU+i8G4UFZHXgSW bl0g== DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=date:from:to:cc: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; bh=r3d4Ods1ylQYesbckzjGkK6Ii9x+0VEZjPsE4TrFn+o=; b=U9A5zUIIBaaio350oy9Wne4rC3AtZLxoIm9ee5Tf0pPq6qux+z8yAKQIitiPc68aFI gWYIhkLCSBSJDePPCt3/AT+f/bqupk/MElGnoMaix9OTCnoudED07J1oyaa6djR9E0QJ w4YAnPmKWdDABdr7m9Ihgazd76MeOKErCJ9m4HbqTunZbsRDIBUnXAMS0umI0sfEre17 qLsAHR+nXbCwKeKOphq9vkrprRSOgKikHE5q96PtTxx3DBCUEKrcWWpQzs6SdsS5V/mA h3Q3IuongA9xWuOm2J2qqgHwJ0yio3nmtV5ykDWmKzBYSQRZ4V+yEw1v8iM3NdhGLmX6 Ebbw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; 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=r3d4Ods1ylQYesbckzjGkK6Ii9x+0VEZjPsE4TrFn+o=; b=LomjgMdSvFvN3zXL/kDIIcEQpQFdNFTrFxcXIeGfQFDm9Jj8+Cl1s5KU8BPK6wVPYK J26SRPnPWB816XKCJmxDqfakorjjyx4QsXbJ2z+fMFe/RbOHQEgYNXemle7BYlj1/Qaf jRX3C14TlIl89etzC1fdJL9xpkraGYLCqzSEE9zjSdMbynESnGrg1p/FO5ML9rBrz7Nk bFMktGmPSFOXRp9XJu9QBR8Bz+2wm8l730wuE3WXMY2XdVCHN+YZK+50rXc+HbYkqJUN FRkuV0v13g9NCrxeDLfkiQCf1oobHrsVNKAxjygWGCe957tdfL8RTW0UIdQn1Y3/48Hi lydg== X-Gm-Message-State: AHYfb5irgnYkHdJ0qe84sAF4RuzhQlUMOOYT7EtkRNxFB6Og4PAvNMUY dEYxySdHwqE1a7VO X-Received: by 10.99.174.3 with SMTP id q3mr6992049pgf.84.1502345941862; Wed, 09 Aug 2017 23:19:01 -0700 (PDT) X-BeenThere: std-proposals@isocpp.org Original-Received: by 10.107.140.80 with SMTP id o77ls5814280iod.27.gmail; Wed, 09 Aug 2017 23:19:00 -0700 (PDT) X-Received: by 10.31.99.198 with SMTP id x189mr58594vkb.24.1502345940514; Wed, 09 Aug 2017 23:19:00 -0700 (PDT) In-Reply-To: X-Original-Sender: jmckesson@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:33776 Archived-At: ------=_Part_471_293108276.1502345940075 Content-Type: multipart/alternative; boundary="----=_Part_472_752484452.1502345940076" ------=_Part_472_752484452.1502345940076 Content-Type: text/plain; charset="UTF-8" On Wednesday, August 9, 2017 at 10:12:36 PM UTC-4, Bo Persson wrote: > > On 2017-08-09 19:32, Evan Teran wrote: > > I never brought it up before because I assumed that it MUST have been > > discussed in the past... > > Oh, yeah... > > > > > The idea being of course that this makes code such as the following > valid: > > > > | > > T value; > > value.data =10; > > std::cout < > | > > > > This could already work if you just add () to each use of data. :-) > Would it? Would this: some_function(value.data()); Would that allow `some_function` to set `data`'s value? To do that, you would need to make `data()` return a proxy object, which can be converted into the appropriate type, but can also be assigned to the appropriate type and otherwise treated exactly like a reference to the other type. That's hardly "just" adding something. -- 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/9979b017-fc21-445f-a1d1-0f55f8e7bf3d%40isocpp.org. ------=_Part_472_752484452.1502345940076 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
On Wednesday, August 9, 2017 at 10:12:36 PM UTC-4, Bo Pers= son wrote:
On 2017-08-09 19:32,= Evan Teran wrote:
> I never brought it up before because I assumed that it MUST have b= een=20
> discussed in the past...=20

Oh, yeah...

>=20
> The idea being of course that this makes code such as the followin= g valid:
>=20
> |
> =C2=A0 =C2=A0 =C2=A0T value;
> =C2=A0 =C2=A0 =C2=A0value.data =3D10;
> =C2=A0 =C2=A0 =C2=A0std::cout <<value.data <<"\n&= quot;
> |
>

This could already work if you just add () to each use of data. =C2=A0:= -)

Would it? Would this:

some_function(value.data());

Would that allow `some_= function` to set `data`'s value? To do that, you would need to make `da= ta()` return a proxy object, which can be converted into the appropriate ty= pe, but can also be assigned to the appropriate type and otherwise treated = exactly like a reference to the other type.

That's hardly "= just" adding something.

--
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To unsubscribe from this group and stop receiving emails from it, send an e= mail to std-proposa= ls+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/9979b017-fc21-445f-a1d1-0f55f8e7bf3d= %40isocpp.org.
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