220 33548 <39572179-b3fe-bce3-3815-df3e9d0b2264@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: Proposal: underlying_cast Date: Wed, 2 Aug 2017 23:54:09 +0200 Lines: 145 Approved: news@gmane.org Message-ID: <39572179-b3fe-bce3-3815-df3e9d0b2264@wanadoo.fr> References: <6a2c32ed-99b5-4cc5-86a5-ee3cc07567a3@isocpp.org> <2570492.NpxuI0RVu0@tjmaciei-mobl1> Reply-To: std-proposals@isocpp.org NNTP-Posting-Host: blaine.gmane.org Mime-Version: 1.0 Content-Type: multipart/alternative; boundary="------------893A3C2320E9565A2BBC615D" X-Trace: blaine.gmane.org 1501710857 23795 195.159.176.226 (2 Aug 2017 21:54:17 GMT) X-Complaints-To: usenet@blaine.gmane.org NNTP-Posting-Date: Wed, 2 Aug 2017 21:54:17 +0000 (UTC) User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.11; rv:52.0) Gecko/20100101 Thunderbird/52.2.1 To: John McFarlane , std-proposals@isocpp.org, Thiago Macieira Original-X-From: std-proposals+bncBDH67CONY4PBBCEURHGAKGQE6PADDEY@isocpp.org Wed Aug 02 23:54:13 2017 Return-path: Envelope-to: gclcip-std-proposals@m.gmane.org Original-Received: from mail-lf0-f71.google.com ([209.85.215.71]) by blaine.gmane.org with esmtp (Exim 4.84_2) (envelope-from ) id 1dd1al-0005o2-Vt for gclcip-std-proposals@m.gmane.org; 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[80.12.242.128]) by mx.google.com with ESMTPS id k23si229330wrk.451.2017.08.02.14.54.16 for (version=TLS1 cipher=AES128-SHA bits=128/128); Wed, 02 Aug 2017 14:54:16 -0700 (PDT) Received-SPF: neutral (google.com: 80.12.242.128 is neither permitted nor denied by best guess record for domain of vicente.botet@wanadoo.fr) client-ip=80.12.242.128; Original-Received: from imac-de-vicente-botet-escriba.home ([86.229.176.71]) by mwinf5d41 with ME id sMu91v0031YoQGN03MuAiT; Wed, 02 Aug 2017 23:54:15 +0200 X-ME-Helo: imac-de-vicente-botet-escriba.home X-ME-Auth: dmljZW50ZS5ib3RldEB3YW5hZG9vLmZy X-ME-Date: Wed, 02 Aug 2017 23:54:15 +0200 X-ME-IP: 86.229.176.71 In-Reply-To: Content-Language: fr X-Original-Sender: vicente.botet@wanadoo.fr X-Original-Authentication-Results: mx.google.com; spf=neutral (google.com: 80.12.242.128 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-Google-Group-Id: 399137483710 List-Post: , List-Help: , List-Archive: List-Subscribe: , List-Unsubscribe: , Xref: news.gmane.org gmane.comp.lang.c++.isocpp.proposals:33548 Archived-At: This is a multi-part message in MIME format. --------------893A3C2320E9565A2BBC615D Content-Type: text/plain; charset="UTF-8"; format=flowed Content-Transfer-Encoding: quoted-printable Le 02/08/2017 =C3=A0 21:05, John McFarlane a =C3=A9crit : > On Wed, Aug 2, 2017, 10:54 Vicente J. Botet Escriba=20 > > wrote: > > Le 02/08/2017 =C3=A0 17:21, John McFarlane a =C3=A9crit : >> >> >> >> Question: If wrapped types are being considered, would anyone >> consider `chrono::duration::rep` to be the underlying type of >> `chrono::duration` or it is something else? Because if the >> former, then `to_rep` from P0675 serves a similar purpose. > For me chrono::duration::rep is the underlying type an underlying > type is something that works not only for numeric types. Your > to_rep()(v) function object is similar as > underlying_cast(v). Just wondering why do you need a function > object. > > I'm not wed to a function object. A requirement is that the user can=20 > customize this for their own types. > > Of course. 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/39572179-b3fe-bce3-3815-df3e9d0b2264%40wanadoo.f= r. --------------893A3C2320E9565A2BBC615D Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
Le 02/08/2017 =C3=A0 21:05, John McFarla= ne a =C3=A9crit=C2=A0:
On Wed, Aug 2, 2017, 10:54 Vicente J. Botet Escriba <vicente.botet@wanadoo.fr> wrote:<= br>
Le 02/08/2017 =C3=A0 17:21, John McFarlane a =C3=A9crit=C2=A0:=



Question: If wrapped types are being considered, would anyone consider `chrono::duration::rep` to be the underlying type of `chrono::duration` or it is something else?=C2=A0 Because if the former, then `to_rep` from P0675 serves a similar purpose.
For me chrono::duration::rep is the underlying type an underlying type is something that works not only for numeric types. Your to_rep<T>()(v) function object is similar as underlying_cast<T>(v). Just wondering why do you need a function object.

I'm not wed to a function object.=C2=A0 A requirement is tha= t the user can customize this for their own types.


Of course.


Vicente

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