220 39904 <4df1f86f-cdee-5275-bdd1-b53f2f10bef8@wanadoo.fr> article Path: news.gmane.org!.POSTED!not-for-mail From: "Vicente J. Botet Escriba" Newsgroups: gmane.comp.lang.c++.isocpp.proposals Subject: Re: Re: Named Parameters for C++ Date: Sat, 18 Aug 2018 17:09:34 +0200 Lines: 71 Approved: news@gmane.org Message-ID: <4df1f86f-cdee-5275-bdd1-b53f2f10bef8@wanadoo.fr> References: <1708615.QdClGnisbJ@tjmaciei-mobl1> <60fba045-252b-486e-92e0-03c08b6d5a35@wanadoo.fr> <1925737.EHUJpxQoH7@tjmaciei-mobl1> Reply-To: std-proposals@isocpp.org NNTP-Posting-Host: blaine.gmane.org Mime-Version: 1.0 Content-Type: text/plain; charset="UTF-8"; format=flowed Content-Transfer-Encoding: quoted-printable X-Trace: blaine.gmane.org 1534604855 16983 195.159.176.226 (18 Aug 2018 15:07:35 GMT) X-Complaints-To: usenet@blaine.gmane.org NNTP-Posting-Date: Sat, 18 Aug 2018 15:07:35 +0000 (UTC) User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.11; rv:52.0) Gecko/20100101 Thunderbird/52.9.1 To: std-proposals@isocpp.org, Thiago Macieira Original-X-From: std-proposals+bncBDH67CONY4PBBM7N4DNQKGQEQCIJS4Q@isocpp.org Sat Aug 18 17:07:31 2018 Return-path: Envelope-to: gclcip-std-proposals@m.gmane.org Original-Received: from mail-wm0-f71.google.com ([74.125.82.71]) by blaine.gmane.org with esmtp (Exim 4.84_2) (envelope-from ) id 1fr2p8-0004Ii-US for gclcip-std-proposals@m.gmane.org; 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[80.12.242.125]) by mx.google.com with ESMTPS id g129-v6si4744647wmg.58.2018.08.18.08.09.38 for (version=TLS1 cipher=AES128-SHA bits=128/128); Sat, 18 Aug 2018 08:09:38 -0700 (PDT) Received-SPF: neutral (google.com: 80.12.242.125 is neither permitted nor denied by best guess record for domain of vicente.botet@wanadoo.fr) client-ip=80.12.242.125; Original-Received: from imac-de-vicente-botet-escriba.home ([86.253.39.2]) by mwinf5d50 with ME id Qf9c1y00E02nUfq03f9dBc; Sat, 18 Aug 2018 17:09:38 +0200 X-ME-Helo: imac-de-vicente-botet-escriba.home X-ME-Auth: dmljZW50ZS5ib3RldEB3YW5hZG9vLmZy X-ME-Date: Sat, 18 Aug 2018 17:09:38 +0200 X-ME-IP: 86.253.39.2 In-Reply-To: <1925737.EHUJpxQoH7@tjmaciei-mobl1> Content-Language: en-US X-Original-Sender: vicente.botet@wanadoo.fr X-Original-Authentication-Results: mx.google.com; spf=neutral (google.com: 80.12.242.125 is neither permitted nor denied by best guess record for domain of vicente.botet@wanadoo.fr) smtp.mailfrom=vicente.botet@wanadoo.fr 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:39904 Archived-At: Le 17/08/2018 =C3=A0 17:05, Thiago Macieira a =C3=A9crit=C2=A0: > On Friday, 17 August 2018 07:46:42 PDT Vicente J. Botet Escriba wrote: >> As this would request to compiler to store somewhere all the >> declarations of a specific function, I believe that in order to don't >> pay for what we don't use, we would need to opt in for the feature is >> some specific way, that I don't worry about. E.g. >> >> void f(a:int, b:int); >> >> void f(x:int x, y:int); >> >> Only in this case the named parameters should be allowed. > Agreed. To me, parameter names need to be opt-in. Anything else is simply= not > workable as the names have not and will continue not to be stable, so the= y > aren't usable by users in the first place. > > But my question to you is: are those two function declarations the same > function? If they are, how do you propose we declare them so that they ar= e > *not* the same function? Yes, they declare the same function. If we wan to have two different overload, we would need something else,=20 that don't need to be a named parameter. We could use now just tag types struct tag1 {} struct tag2 {} void f(tag1, a:int, b:int); void f(tag2, x:int, y:int); Now we can call f using the tag objects f(tag1{}, a:=3D1, b:=3D2); f(tag2{}, x:=3D1, y:=3D2); and we could add any syntactic sugar that make it easier to define those ta= gs, and make them even local to the function void f(@tag1, a:int, b:int); void f(@tag2, x:int, y:int); Now we can call f using the local tags f(@tag1, a:=3D1, b:=3D2); f(@tag2, x:=3D1, y:=3D2); Note that tagx is not associated to any named parameter. Vicente --=20 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 e= mail 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/4df1f86f-cdee-5275-bdd1-b53f2f10bef8%40wanadoo.f= r. .