220 40232 article Path: news.gmane.org!.POSTED!not-for-mail From: Jake Arkinstall Newsgroups: gmane.comp.lang.c++.isocpp.proposals Subject: Re: std::between ? Date: Thu, 27 Sep 2018 17:07:10 +0100 Lines: 112 Approved: news@gmane.org Message-ID: References: <7b85d688-9013-407d-b7d3-10d28494e960@isocpp.org> Reply-To: std-proposals@isocpp.org NNTP-Posting-Host: blaine.gmane.org Mime-Version: 1.0 Content-Type: multipart/alternative; boundary="000000000000b4e0170576dc8884" X-Trace: blaine.gmane.org 1538064317 21677 195.159.176.226 (27 Sep 2018 16:05:17 GMT) X-Complaints-To: usenet@blaine.gmane.org NNTP-Posting-Date: Thu, 27 Sep 2018 16:05:17 +0000 (UTC) To: std-proposals@isocpp.org Original-X-From: std-proposals+bncBDCZX3WUUQFRBOUAWTOQKGQEKL3FQRA@isocpp.org Thu Sep 27 18:05:13 2018 Return-path: Envelope-to: gclcip-std-proposals@m.gmane.org Original-Received: from mail-it1-f197.google.com ([209.85.166.197]) by blaine.gmane.org with esmtp (Exim 4.84_2) (envelope-from ) id 1g5Ymv-0005Yo-B1 for gclcip-std-proposals@m.gmane.org; Thu, 27 Sep 2018 18:05:13 +0200 Original-Received: by mail-it1-f197.google.com with SMTP id w68-v6sf8356528ith.0 for ; Thu, 27 Sep 2018 09:07:24 -0700 (PDT) ARC-Seal: i=2; a=rsa-sha256; t=1538064443; cv=pass; d=google.com; s=arc-20160816; b=z0M6RaIsfjG85h0M0XO1DPf05Gjb8hjXMSrqJiGMialWzgjq2fQpvqD/ocrU/T85O7 P5xYLqAmiT/maZYcpy2dR323qgosReeQcVVVIpG5g6C90B/hCRmfpwc2cOMNzk9b+prc t7H2Dl2gBYggKDJC+9ps4YjSS+aG4+4s3BJ8K+c5Je6lpHGVble+QMSngNXKHU04ma0F PZPgFTgaK69JJIUPLi0jB1QV0bGXNYGhVKUKX8G5rJTGOwBKDRId6JXkpXKfIs3vQXm+ uoClFN/zC18LSJsSifYMI39vLvLWco6W05Fk+Pa8yvcpkNmFVmHtLAaIvFQgTFkS3L04 InBw== ARC-Message-Signature: i=2; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-unsubscribe:list-subscribe:list-archive:list-help:list-post :list-id:mailing-list:precedence:reply-to:to:subject:message-id:date :from:in-reply-to:references:mime-version:dkim-signature; bh=Beid8uff84huYYffvZSFGJmbOjjXUmA1AJlDXvfQ/uc=; b=NzAXyNLZ/bSRNZlZRzNmaWTdNxakOjvj4FabY1QVcwMbCdoRv9y6I6jL5L93I8HoFi S9OBWNuKlq62aU6LTRK7Jd65okrnmMuqMQ5d5brsHTXCd36vnue78tFmOVsCgdjUvCIf /Cpm5A5aP5+2OtVivO9L6JCECc3D/NiCf+j1hPmrMV3JN7mzvuNUBcDnxl0c4gQLolNC kSYL09JfpSH86ZsfUTlwevZJflh0IFjORy8kJ3v3F6xwCqYF4QpawObuZwHfhExEnESN Qntp7iHQybbcX+fkZVK5pQ9pKXWMWFkLdLvoYF3l+/mwhQ3p6me2hQXe7xn6IahFWRN9 I3Tw== ARC-Authentication-Results: i=2; mx.google.com; dkim=pass header.i=@gmail.com header.s=20161025 header.b=DkdendeR; spf=pass (google.com: domain of jake.arkinstall@gmail.com designates 209.85.220.41 as permitted sender) smtp.mailfrom=jake.arkinstall@gmail.com; dmarc=pass (p=NONE sp=QUARANTINE dis=NONE) header.from=gmail.com DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=isocpp-org.20150623.gappssmtp.com; s=20150623; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :x-original-sender:x-original-authentication-results:reply-to :precedence:mailing-list:list-id:list-post:list-help:list-archive :list-subscribe:list-unsubscribe; bh=Beid8uff84huYYffvZSFGJmbOjjXUmA1AJlDXvfQ/uc=; b=Zu6fsuHM1TMACzkZRnMqXm7W7QSSClQzzpMzYqdsWTa6wJOM7IcAxlqXhhwl1b3PvQ QQ6UZwI9GOnZZcQeVFT0avgbO8NLkupB/gK90vSmoplb5qajFe4OmTzCasCAkAvUmxJ6 mbJr1gaBZQ+fC1ouZI+SgcbpXOtrQVWtKzQM3ghW63CkClfkCLmBF/XHBv/M37ZSBaWx VL3b95I2uyrTT30OcFjiys6ZXHrFxUaZIRINiIWdIfeSP1Xpb+rSoN3PSsmPW5pBZj4y 1+L5yCyZjp/hbMciBvh5VELoSSq1hyMNUuWmieomyKT5B8gIoDjLBh/C4sEu1TPNtjsi qefw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:x-original-sender :x-original-authentication-results:reply-to:precedence:mailing-list :list-id:x-spam-checked-in-group:list-post:list-help:list-archive :list-subscribe:list-unsubscribe; bh=Beid8uff84huYYffvZSFGJmbOjjXUmA1AJlDXvfQ/uc=; b=go4Jv7Sxbi0AmFdfVimh4/Ni92UW6HOCqtiwlWN1vcKCV381QYBLDOtDaA6evDzY/F 6fH741hLGnZcKcL4lSXg7p/dzqpxOtXxmV61hp9ani4TMeeHCBrHsNky/RS8zFcH5LNJ d7QAmV8lHMuKb44XVFa1qlXY8KJL3gNkWdctzqDI4inzRDZnFyukHyysJ2thGikKIJhR uOeTF2tEzU7oUysX0/Tv5ArG4ZzQmCmcmHnd6wjp8y2zGGW5i2QX30xh8P9cBae9MOIe uDBI43U0mLps75IeKS9tsIIKhXtfBGjoHfMglPvMMDP3N0BQYr/0CEJmYmlIoWbQ2NAv aPVA== X-Gm-Message-State: ABuFfojj5c8N2DwYuhsiqRkrsqEWvwiwNE7VbudYZRz3EGAsMqTrifkY wSjBzYDHcN/8OlHr04/8gjeA5g== X-Google-Smtp-Source: ACcGV62uQ+xrZD2jHr6Lk/yz9eLk7GHqgM5H8qu1uoQnUVfJh5bpL2JyFh63KQS8fhFMOQX7YpdT6g== X-Received: by 2002:a6b:b2c8:: with SMTP id b191-v6mr7534518iof.5.1538064443834; Thu, 27 Sep 2018 09:07:23 -0700 (PDT) X-BeenThere: std-proposals@isocpp.org Original-Received: by 2002:a24:4161:: with SMTP id x94-v6ls217232ita.1.gmail; Thu, 27 Sep 2018 09:07:22 -0700 (PDT) X-Received: by 2002:a24:7cc6:: with SMTP id a189-v6mr990838itd.42.1538064442519; Thu, 27 Sep 2018 09:07:22 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; t=1538064442; cv=none; d=google.com; s=arc-20160816; b=ZU1tGaNWvgS/+OqODjGViD8uTzL3yxSlznjgCKjBTdHDUJA7NjBL9+NQlEzsU7v6aA Hw4gncst4+KSdQe7GN8K1xp/zt8noiAQQWwOUgixsRKsFX6sjlXdTLVoBELP35Pml8qs bI8mvbO9KsqsKf61WFid6Ek/SUe9l+I2xhho6JHk1h+uCdLW1jO13QLVldVsrXI34aO5 merPgNnPUQ1NAy0gPL8CSFEx67IQRrVdiZhgUa1jgbRVkyl+djJrlV4fh13+NKZxKgZU 9FPl8I9lloyNQDfyhZ006TBWDjYx3hJ8THxVMEazAuMohemY/dOUTMCFZmAOa8t3e8vM EPhg== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=to:subject:message-id:date:from:in-reply-to:references:mime-version :dkim-signature; bh=dc9tYnHfYqyLdmQJHpDjgimpy21Y0ztUE3yJ51daG5M=; b=CIRN6zoGJHEMALf8zCmXWXKCi0uiSlDSm1Dm2PnduTg6SA0OIFXTBbmU1iXxsgOtNb 0PmX2Qo+1rfS51RKjxIM+V5NuBePufb5aPTZEoYmyHJy4CQdR++vSSGOfw5D745m4KmG wPXbTjA/DYY2aSwLuD4PBUR8l1otoK2oyNfImmnr4qcosdimU6jZbWTjuoQFM8q+n9C0 VYwlTjuntC+AWzLXOEwy1MyDS+GqGAteY7zO7Kvxnj8XKjT7uYemWSdZNY5RLtZZlfYC xCBB/8omeuq9OH0SaIlRuKQ50VZBm3bGdWzeXIlGhCZyPVWbV0ecjlyiWyJem1oGjZmM zRdg== ARC-Authentication-Results: i=1; mx.google.com; dkim=pass header.i=@gmail.com header.s=20161025 header.b=DkdendeR; spf=pass (google.com: domain of jake.arkinstall@gmail.com designates 209.85.220.41 as permitted sender) smtp.mailfrom=jake.arkinstall@gmail.com; dmarc=pass (p=NONE sp=QUARANTINE dis=NONE) header.from=gmail.com Original-Received: from mail-sor-f41.google.com (mail-sor-f41.google.com. [209.85.220.41]) by mx.google.com with SMTPS id z15-v6sor783266iol.132.2018.09.27.09.07.22 for (Google Transport Security); Thu, 27 Sep 2018 09:07:22 -0700 (PDT) Received-SPF: pass (google.com: domain of jake.arkinstall@gmail.com designates 209.85.220.41 as permitted sender) client-ip=209.85.220.41; X-Received: by 2002:a6b:8f44:: with SMTP id r65-v6mr9694790iod.59.1538064441985; Thu, 27 Sep 2018 09:07:21 -0700 (PDT) In-Reply-To: <7b85d688-9013-407d-b7d3-10d28494e960@isocpp.org> X-Original-Sender: jake.arkinstall@gmail.com X-Original-Authentication-Results: mx.google.com; dkim=pass header.i=@gmail.com header.s=20161025 header.b=DkdendeR; spf=pass (google.com: domain of jake.arkinstall@gmail.com designates 209.85.220.41 as permitted sender) smtp.mailfrom=jake.arkinstall@gmail.com; dmarc=pass (p=NONE sp=QUARANTINE dis=NONE) header.from=gmail.com 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:40232 Archived-At: --000000000000b4e0170576dc8884 Content-Type: text/plain; charset="UTF-8" It has come up before. The issue is that a wrote: > I do this pattern often: > > if (0 < x && x < 100) > > And would love a simple `std::between()` that would take two arguments and > an optional third (compare function) argument. > > Similar to this: https://gist.github.com/martinmoene/9410391 > > templated > bool std::between(T lower, T upper, Compare comp) > { > return comp(lower) && comp(upper); > } > > Does anything like this exist? Should I propose it!? > > -- > 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. > To view this discussion on the web visit > https://groups.google.com/a/isocpp.org/d/msgid/std-proposals/7b85d688-9013-407d-b7d3-10d28494e960%40isocpp.org > > . > -- 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. To view this discussion on the web visit https://groups.google.com/a/isocpp.org/d/msgid/std-proposals/CAC%2B0CCOxq7j%3Dq1SYGHQs-LYiWq6ojoQubBD%3Dux5vehrMqm7vqQ%40mail.gmail.com. --000000000000b4e0170576dc8884 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
It has come up before. The issue is that a<b<c is e= valuated as (a<b)<c, where (a<b) is a bool. We would thus need a s= pecial case to deal with this.

Personally, I don't imagine that people are actually using a<b<c= to compare the comparison (a<b) against c. Its possible, though, and so= adding a special case for comparisons will break something somewhere. I wa= nt it, it's lovely syntax, but backwards compatibility is lovely too, e= ven in cases where legacy code is doing something bizarre.

<= div class=3D"gmail_quote">
On Thu, 27 Sep 2018, 16:53 Addy,= <aclaure@gmail.com> wrote:<= br>
I do this pattern = often:

if (0 < x && x < 100)
And would love a simple `std::between()` that would take two ar= guments and an optional third (compare function) argument.


templated<typename T,= typename Compare>
bool std::between(T lower, T upper, Compare= comp)
{
=C2=A0 =C2=A0 return comp(lower) && co= mp(upper);
}

Does anything like this exi= st? Should I propose it!?

--
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. To view this discussion on the web visit https://groups.google.com/a/isocpp.org/d/msgid/std-propo= sals/7b85d688-9013-407d-b7d3-10d28494e960%40isocpp.org.

--
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-proposa= ls+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/CAC%2B0CCOx= q7j%3Dq1SYGHQs-LYiWq6ojoQubBD%3Dux5vehrMqm7vqQ%40mail.gmail.com.
--000000000000b4e0170576dc8884-- .