220 5410 <0bd76d6d-a1f2-4c29-82e8-99dbb5358453@isocpp.org> article Path: news.gmane.org!not-for-mail From: stackmachine@hotmail.com Newsgroups: gmane.comp.lang.c++.isocpp.proposals Subject: Re: Overloaded Declarators Date: Tue, 16 Jul 2013 23:16:55 -0700 (PDT) Lines: 203 Approved: news@gmane.org Message-ID: <0bd76d6d-a1f2-4c29-82e8-99dbb5358453@isocpp.org> References: <82b89c5e-ce4e-49c0-82b2-d6032631e3e3@isocpp.org> Reply-To: std-proposals@isocpp.org NNTP-Posting-Host: plane.gmane.org Mime-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_Part_372_6843545.1374041815608" X-Trace: ger.gmane.org 1374041818 28298 80.91.229.3 (17 Jul 2013 06:16:58 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Wed, 17 Jul 2013 06:16:58 +0000 (UTC) Cc: andrewtomazos@gmail.com To: std-proposals@isocpp.org Original-X-From: std-proposals+bncBDC7BQ4GSIMRBWHNTCHQKGQEFK7JHQY@isocpp.org Wed Jul 17 08:16:59 2013 Return-path: Envelope-to: gclcip-std-proposals@m.gmane.org Original-Received: from mail-qe0-f69.google.com ([209.85.128.69]) by plane.gmane.org with esmtp (Exim 4.69) (envelope-from ) id 1UzL2n-00081S-T3 for gclcip-std-proposals@m.gmane.org; Wed, 17 Jul 2013 08:16:58 +0200 Original-Received: by mail-qe0-f69.google.com with SMTP id a11sf2391350qen.0 for ; Tue, 16 Jul 2013 23:16:57 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20120113; h=x-beenthere:date:from:to:cc:message-id:in-reply-to:references :subject:mime-version:x-original-sender:reply-to:precedence :mailing-list:list-id:x-google-group-id:list-post:list-help :list-archive:list-subscribe:list-unsubscribe:content-type; bh=V8eCfTWPetE5N8YQB1fa8ROE9n463tK2948wfvcDfJ0=; b=dospZrQvT/0ub1DEuSgtScsjpkD/bQM0811776xm0DsHbbpNWE9mluVvZK8y5NOi1P 2UmNeJCrlGU7UcvS4/0rT2NRi6HFmh49VxJ78CDxgRsGSe5ynnQXA88Me4cNK8tvmNpa Byi2kKkSbIL5NHiolymGrzibQ5oDNNu+5RACvFUAxWAc+/XInVBpwH41k96IOkyKH2lO /Wqd2VF89tuhypaxlq1XsVz8DffVv8J3CVcyA1SLzFM+8eVQz7z9gliW6yvdeMBi1LLj frnzUc+wXskV+IXGNTZ3mr38914t+l0SabrM8rTesNrdUcavstxex/sS472D8t5oHZI3 dLYg== X-Received: by 10.236.125.200 with SMTP id z48mr2938133yhh.55.1374041817110; Tue, 16 Jul 2013 23:16:57 -0700 (PDT) X-BeenThere: std-proposals@isocpp.org Original-Received: by 10.49.50.66 with SMTP id a2ls796287qeo.41.gmail; Tue, 16 Jul 2013 23:16:56 -0700 (PDT) X-Received: by 10.49.16.163 with SMTP id h3mr262117qed.24.1374041816215; Tue, 16 Jul 2013 23:16:56 -0700 (PDT) In-Reply-To: <82b89c5e-ce4e-49c0-82b2-d6032631e3e3@isocpp.org> X-Original-Sender: stackmachine@hotmail.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:5410 Archived-At: ------=_Part_372_6843545.1374041815608 Content-Type: text/plain; charset=ISO-8859-1 I think this feature has potential but needs more work. Overloading existing declarators is dangerous as has already been pointed out. Instead I would like to see custom declarators. e.g.: {int, double, std::string} x = {42, 3.14, "foo"}; // {T...} means std::tuple std::string -> int m = {{"foo", 1}, {"bar", 2}}; // K -> V means std::map [int] x = { 1, 2, 3, 4, 5 }; // [T] means std::vector I have no idea how you would define these or if that would introduce any parsing ambiguities though. I could imagine using a syntax similar to alias templates: template using { T... } = std::tuple; template using T -> U = std::map; template using [T] = std::vector; -- --- 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_372_6843545.1374041815608 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable I think this feature has potential but needs more work. Overloading existin= g declarators is dangerous as has already been pointed out.
Instead I wo= uld like to see custom declarators. e.g.:
{int, d= ouble, std::string} x =3D {42, 3.14, "foo"}; // {T...} means std::tuple<T...>
std::string -> int= m = =3D {{"foo", 1}, {"bar", 2}}; // K -> V means std::map<K, V>
[int] x =3D { 1, 2, 3, 4, 5 }; // [T] means std::vector<= T>
<= /span>
I have no idea how you would define these or if th= at would introduce any parsing ambiguities though.
I could imagine using= a syntax similar to alias templates:
template <typename... T>= ;
using { T... } =3D= std::tuple<T...>;

template <typename T, = typename U>
using T -> U =3D std:= :map<T, U>;

template <typen= ame T>
using [T] = =3D std::vector<T>;


--
 
---
You received this message because you are subscribed to the Google Groups &= quot;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.
Visit this group at http://groups.google.com/a/isocpp.org/group/std-proposals/<= /a>.
 
 
------=_Part_372_6843545.1374041815608-- .