220 8796 article Path: news.gmane.org!not-for-mail From: jbates@jbat.es Newsgroups: gmane.comp.lang.c++.isocpp.proposals Subject: Re: Fixed-sized alternative to initializer_list Date: Fri, 24 Jan 2014 17:43:28 -0800 (PST) Lines: 86 Approved: news@gmane.org Message-ID: References: <320093b8-e08f-4918-9424-cd3d722a6652@isocpp.org> Reply-To: std-proposals@isocpp.org NNTP-Posting-Host: plane.gmane.org Mime-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_Part_781_28286138.1390614208202" X-Trace: ger.gmane.org 1390614203 9470 80.91.229.3 (25 Jan 2014 01:43:23 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Sat, 25 Jan 2014 01:43:23 +0000 (UTC) Cc: jbates@jbat.es To: std-proposals@isocpp.org Original-X-From: std-proposals+bncBD67TM4CW4KBBQNNRSLQKGQEULVEAII@isocpp.org Sat Jan 25 02:43:31 2014 Return-path: Envelope-to: gclcip-std-proposals@m.gmane.org Original-Received: from mail-ie0-f199.google.com ([209.85.223.199]) by plane.gmane.org with esmtp (Exim 4.69) (envelope-from ) id 1W6sHT-00007l-32 for gclcip-std-proposals@m.gmane.org; Sat, 25 Jan 2014 02:43:31 +0100 Original-Received: by mail-ie0-f199.google.com with SMTP id x13sf10755403ief.6 for ; Fri, 24 Jan 2014 17:43:30 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; 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:list-post:list-help:list-archive :list-subscribe:list-unsubscribe:content-type; bh=pwA6NYWw4d7UoQpVkaEujBMcbw+GqewMnANQmjXapAY=; b=F/hIpq6p4/5b/PdjDPCe+MOWxNaAgYBtQonci+T6fJ/AcnPJdmesG6pJoGp2Zl/qK1 lLRa0Ul0t7Af2XTEx1c7pPxAdj208sV5uh6T7+kpvk+b6S0NO3L/uUaTauRFwPF07PUv aINha1r027MAsJBwc+h/Mget3QHgx74RHVTej/Tt9nykFUl/9FSSa8bIxyImw7pOQ1pQ e4vPdQcv0kcKzhxbrWzxv+kUTEOvXYBwxBcizYUGAmO9SYoS9pCKgJEySmyI47fAwwPR 82wWFB1iUagrEYgDV3C5TRwrBFxhO1zyM+oSwGXDXSbGg99L+XtYuXMpi6CE3q9LaF2U n3IA== X-Gm-Message-State: ALoCoQkjk4zUVF15rCbMYpRUsxplOQsRgrYFFNGzPkQvKd473iCJ5fJtp87hipsRD0EOJ4o8ngjQ X-Received: by 10.182.158.4 with SMTP id wq4mr6579308obb.18.1390614210132; Fri, 24 Jan 2014 17:43:30 -0800 (PST) X-BeenThere: std-proposals@isocpp.org Original-Received: by 10.50.41.2 with SMTP id b2ls1185777igl.26.canary; Fri, 24 Jan 2014 17:43:29 -0800 (PST) X-Received: by 10.50.20.7 with SMTP id j7mr67826ige.8.1390614209552; Fri, 24 Jan 2014 17:43:29 -0800 (PST) In-Reply-To: <320093b8-e08f-4918-9424-cd3d722a6652@isocpp.org> X-Original-Sender: jbates@jbat.es 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:8796 Archived-At: ------=_Part_781_28286138.1390614208202 Content-Type: text/plain; charset=UTF-8 Just realized I didn't really give any details for what I want to propose! What I want would be essentially the same as initializer_list, but have a second template parameter specifying a size. It would then only match braced-init-lists of the specified size. Maybe it would also match the interface of std::array and/or include some easy way to initialize std::arrays or C-style arrays with it. On Friday, January 24, 2014 3:36:40 PM UTC-10, jba...@jbat.es wrote: > > I've been playing around with types that extend the functionality of > std::array. I want to add more constructors, but I also want to retain the > aggregate initialization syntax, e.g.: > my_cool_array_type a = {1, 2, 3, 4}; > > Neither variadic templates nor initializer_list yield satisfactory > results. A good discussion as to why can be found in the following SO > question: > http://stackoverflow.com/questions/21342545/implementing-stdarray-like-constructors-in-other-classes > > initializer_list comes close, but it's not well-optimized for generic > fixed-sized containers. Is anyone opposed to a fixed-sized alternative to > initializer_list (maybe call it initializer_array)? I'm interested in > writing a proposal. > -- --- 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_781_28286138.1390614208202 Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: quoted-printable
Just realized I didn't really give any details for what I = want to propose!

What I want would be essentially the same as initia= lizer_list, but have a second template parameter specifying a size. It woul= d then only match braced-init-lists of the specified size. Maybe it would a= lso match the interface of std::array and/or include some easy way to initi= alize std::arrays or C-style arrays with it.

On Friday, January 24, = 2014 3:36:40 PM UTC-10, jba...@jbat.es wrote:
I've been playing around with types that ex= tend the functionality of std::array. I want to add more constructors, but = I also want to retain the aggregate initialization syntax, e.g.:
my_coo= l_array_type<float, 4> a =3D {1, 2, 3, 4};

N= either variadic templates nor initializer_list yield satisfactory results. = A good discussion as to why can be found in the following SO question: = ;http://stackoverflow.com/questions/21= 342545/implementing-stdarray-like-constructors-in-other-classes

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