220 3675 <937b14b6-6463-4d65-817e-66766c39baee@isocpp.org> article Path: news.gmane.org!not-for-mail From: Olaf van der Spek Newsgroups: gmane.comp.lang.c++.isocpp.proposals Subject: Re: N3573: Why heterogenous extensions to unordered containers will not work Date: Tue, 9 Apr 2013 11:56:53 -0700 (PDT) Lines: 62 Approved: news@gmane.org Message-ID: <937b14b6-6463-4d65-817e-66766c39baee@isocpp.org> References: Reply-To: std-proposals@isocpp.org NNTP-Posting-Host: plane.gmane.org Mime-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_Part_5542_15378143.1365533813588" X-Trace: ger.gmane.org 1365533813 25897 80.91.229.3 (9 Apr 2013 18:56:53 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Tue, 9 Apr 2013 18:56:53 +0000 (UTC) Cc: jgottman6@gmail.com To: std-proposals@isocpp.org Original-X-From: std-proposals+bncBC5NB45SSABBB5WISGFQKGQECBW5ZCY@isocpp.org Tue Apr 09 20:56:57 2013 Return-path: Envelope-to: gclcip-std-proposals@m.gmane.org Original-Received: from mail-gg0-f199.google.com ([209.85.161.199]) by plane.gmane.org with esmtp (Exim 4.69) (envelope-from ) id 1UPdiy-0000X8-KA for gclcip-std-proposals@m.gmane.org; Tue, 09 Apr 2013 20:56:56 +0200 Original-Received: by mail-gg0-f199.google.com with SMTP id v2sf9715296ggc.10 for ; Tue, 09 Apr 2013 11:56:55 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=x-received:x-beenthere:x-received: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=iLn5jNo9/f3yvgUkKhB+Kbn+UM3sgpWzX+RaNzLIZB0=; b=y3ipil5X5yv12LhEKi+itD8Bys6mwKMvQ9icefCTsSMFNgsElEYvDY3pF9RGhfAlkz X6xbwV01dETlt1w0m4GzhUjETc1XjEgw5Ia8Lt/6spqC8PQsPQlQetHuPBE/rKSoiOyu 0r8FQZTowpf13AxFef528w3i0wplsqgEx3LEKLNkNMab/el9u1P7cgOGi7zvatg1lL7s aVg96vu5TVUyKsJGzL0Fw/sN392d3K9tFEGorfWQ9dh6KCGSw9cQQQgwdsBtQtS1va3g +PMCWX8xjLCJJ7cEgcCWGw2XdVC8WW96F0DdFSPcFEfTfoskgyvqfDAB8oJ1le+9CZuk /K7w== X-Received: by 10.236.164.40 with SMTP id b28mr3824042yhl.40.1365533815274; Tue, 09 Apr 2013 11:56:55 -0700 (PDT) X-BeenThere: std-proposals@isocpp.org Original-Received: by 10.49.107.103 with SMTP id hb7ls4050511qeb.52.gmail; Tue, 09 Apr 2013 11:56:54 -0700 (PDT) X-Received: by 10.49.2.170 with SMTP id 10mr1964203qev.40.1365533814165; Tue, 09 Apr 2013 11:56:54 -0700 (PDT) In-Reply-To: X-Original-Sender: olafvdspek@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:3675 Archived-At: ------=_Part_5542_15378143.1365533813588 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable Op dinsdag 9 april 2013 15:11:14 UTC+2 schreef R=F3bert D=E1vid het volgend= e: > > If a =3D=3D b, then I would expect that hash(a) =3D=3D hash(b). If a lang= uage does=20 > not exhibit this, then there is something wrong - from a user's perspecti= ve=20 > hashing is useless if it produces different results for equal values... > > How'd you implement that for float vs int? --=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. Visit this group at http://groups.google.com/a/isocpp.org/group/std-proposa= ls/?hl=3Den. ------=_Part_5542_15378143.1365533813588 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable

Op dinsdag 9 april 2013 15:11:14 UTC+2 schreef R=F3bert D=E1vid het= volgende:
If a =3D=3D b, then = I would expect that hash(a) =3D=3D hash(b). If a language does not exhibit = this, then there is something wrong - from a user's perspective hashing is = useless if it produces different results for equal values...


How'd you implement that for float vs = int?

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