220 28833 article Path: news.gmane.org!.POSTED!not-for-mail From: "Ivan G." Newsgroups: gmane.comp.lang.c++.isocpp.proposals Subject: Re: Re: std::reverse_lookup for arrays, does it at least make some sense? Date: Fri, 14 Oct 2016 05:22:47 -0700 (PDT) Lines: 123 Approved: news@gmane.org Message-ID: References: <8c3194d9-dd08-4bf9-9612-82b6aff3d55f@isocpp.org> <67db4ec6-764c-4b31-a90d-22b0ec1ae0fd@isocpp.org> Reply-To: std-proposals@isocpp.org NNTP-Posting-Host: blaine.gmane.org Mime-Version: 1.0 Content-Type: multipart/mixed; boundary="----=_Part_818_164022212.1476447767811" X-Trace: blaine.gmane.org 1476447781 28809 195.159.176.226 (14 Oct 2016 12:23:01 GMT) X-Complaints-To: usenet@blaine.gmane.org NNTP-Posting-Date: Fri, 14 Oct 2016 12:23:01 +0000 (UTC) To: ISO C++ Standard - Future Proposals Original-X-From: std-proposals+bncBD26JFH7QQHRBG44QPAAKGQEDR5T4UQ@isocpp.org Fri Oct 14 14:22:54 2016 Return-path: Envelope-to: gclcip-std-proposals@m.gmane.org Original-Received: from mail-oi0-f72.google.com ([209.85.218.72]) by blaine.gmane.org with esmtp (Exim 4.84_2) (envelope-from ) id 1bv1Vl-0006PV-59 for gclcip-std-proposals@m.gmane.org; Fri, 14 Oct 2016 14:22:53 +0200 Original-Received: by mail-oi0-f72.google.com with SMTP id d185sf217787718oig.1 for ; Fri, 14 Oct 2016 05:22:55 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=isocpp-org.20150623.gappssmtp.com; s=20150623; h=date:from:to: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=jQp96f1bJxbJXdgyUY8FsxRWAmjAOoS+StYydO8df6Q=; b=O1HBpEYCqQIb9WwRgK/u5LfxWFhbIcUar45V3Zr3hZB+h70R5XAW8j5nv757fMx8Hy HXXStCMQtyVuUDbsfCbNj+ur5i7hwDDFa/7npYNkejEfj3I1BcXP2vhEtsUoaQqx5Bfq wPjMH2WqSqJZHl8jkIEKB5LpLd2Ts/KOkZLqpCeYixFXfjA8UfK9LSNJts13YU4u/4Py 48b9waSa8msKaILziXwbEvcr1aiDThKw3gn5IGcJj5IO9ZhahrYJhfw18MswK7djCwA1 lbmS4OiFVvVGofb5VLBCutCX6IYPLMBLdFXUIXO0jlH6iYNRo6RTJ8Jj4GHVoRCm17o9 t41A== DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=date:from:to: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=jQp96f1bJxbJXdgyUY8FsxRWAmjAOoS+StYydO8df6Q=; b=iGONOmaqUKF+/iqiBI+yRYueOGbs4h8TpMSDIomWcJqjNzQ+kau1VMMZGYDW01HSsF uLa+yRu2MdRsb9eRf42s1CIKMXuVboI8gWd/3p53bLxH93xKIj4y6CmfHo64slmPvAVq NO21qtfK2fbH7QNjruzbf3EGXbyRRm9OFL/pXcP0R+a6tL73PBVDBeFPmhbQGmFOAw+c 5tQgvM5uq1JCv5PfTUp63/WObkvFU/uj0NrcaGnK/Iez9h9xFFqrHqLhL5Jz4TOL2zXe se1FGyOdPIHCrTjPSbEBJvElnXG55rx6y5a3WLjyk9TKsXR168iNZe05VEcULfpim/s1 +Tdg== 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: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=jQp96f1bJxbJXdgyUY8FsxRWAmjAOoS+StYydO8df6Q=; b=TheSA2JdbGMGe/nH4nj8QQdWwxmjd33d8U7ohw9rf/OlsyvJqLXbVEcK9eVM6ijVN5 pB5FGdxAOq0ck93pOV9JEVsYmSEizpyMWHv3jQF1s7SZxVU5f7lMBltajFJ7jIp/c9wy aK55ZjQatjCWQH9+ND0iV4l7JeSe9QMIdJ66BGxYIa1ZbHcx62j6z2lNa0MWlxrzAM/d ev562kG9xzDk9jwbE0o0gRomeRuAtIWIoREgAgfnAS7JQIyv98po/4e9OvQwXKF2yif0 sklZfymJZu4IRrv2IwKwcV90voZWwKC0mUYro9vgrcEyaqUjTrkDkm+qbx+mLrcYDFPG adTA== X-Gm-Message-State: AA6/9RlCh62taP3iutptubwn0eg2ghbbLTZ3/+C6myGP4mR0AVZNjX0gJ3mecpa0GLzNBQ== X-Received: by 10.157.60.216 with SMTP id t24mr2840163otf.71.1476447775097; Fri, 14 Oct 2016 05:22:55 -0700 (PDT) X-BeenThere: std-proposals@isocpp.org Original-Received: by 10.107.19.200 with SMTP id 69ls2781786iot.4.gmail; Fri, 14 Oct 2016 05:22:51 -0700 (PDT) X-Received: by 10.36.121.78 with SMTP id z75mr1068870itc.9.1476447771173; Fri, 14 Oct 2016 05:22:51 -0700 (PDT) In-Reply-To: X-Original-Sender: nekotekina@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:28833 Archived-At: ------=_Part_818_164022212.1476447767811 Content-Type: multipart/alternative; boundary="----=_Part_819_1246463895.1476447767811" ------=_Part_819_1246463895.1476447767811 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable Yes, it's effectively constexpr std::find_if. Can it itself become=20 constexpr in future? I also tried to imagine how it could work for C string= =20 arrays, but maybe it needs totally different function. =D1=87=D0=B5=D1=82=D0=B2=D0=B5=D1=80=D0=B3, 13 =D0=BE=D0=BA=D1=82=D1=8F=D0= =B1=D1=80=D1=8F 2016 =D0=B3., 18:00:50 UTC+3 =D0=BF=D0=BE=D0=BB=D1=8C=D0=B7= =D0=BE=D0=B2=D0=B0=D1=82=D0=B5=D0=BB=D1=8C Micha=C5=82 Dominiak=20 =D0=BD=D0=B0=D0=BF=D0=B8=D1=81=D0=B0=D0=BB: > > Sounds like a job for `std::find_if`. > > On Thu, Oct 13, 2016 at 4:59 PM Nicol Bolas > wrote: > >> What exactly do you mean by "reverse lookup"? What is this function=20 >> supposed to return? >> --=20 >> You received this message because you are subscribed to the Google Group= s=20 >> "ISO C++ Standard - Future Proposals" group. >> To unsubscribe from this group and stop receiving emails from it, send a= n=20 >> email to std-proposal...@isocpp.org . >> To post to this group, send email to std-pr...@isocpp.org . >> To view this discussion on the web visit=20 >> https://groups.google.com/a/isocpp.org/d/msgid/std-proposals/67db4ec6-76= 4c-4b31-a90d-22b0ec1ae0fd%40isocpp.org=20 >> >> . >> > --=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/d5b5e9e2-1110-41a9-92cc-1a9f54ac6b5a%40isocpp.or= g. ------=_Part_819_1246463895.1476447767811 Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: quoted-printable
Yes, it's effectively constexpr std::find_if. Can it i= tself become constexpr in future? I also tried to imagine how it could work= for C string arrays, but maybe it needs totally different function.
=D1=87=D0=B5=D1=82=D0=B2=D0=B5=D1=80=D0=B3, 13 =D0=BE=D0=BA=D1=82=D1=8F=D0= =B1=D1=80=D1=8F 2016 =D0=B3., 18:00:50 UTC+3 =D0=BF=D0=BE=D0=BB=D1=8C=D0=B7= =D0=BE=D0=B2=D0=B0=D1=82=D0=B5=D0=BB=D1=8C Micha=C5=82 Dominiak =D0=BD=D0= =B0=D0=BF=D0=B8=D1=81=D0=B0=D0=BB:
Sounds like a job for `std::find_if`.

On Thu, Oct 13, 2016 at 4:59 PM Nico= l Bolas <jmck...@gmail.com> wrote:
What exactly do you mean by "reverse lookup"= ;? What is this function supposed to return?
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