220 37557 article Path: news.gmane.org!.POSTED!not-for-mail From: Ville Voutilainen Newsgroups: gmane.comp.lang.c++.isocpp.proposals Subject: Re: Re: Remove floating point requirement for unordered (multi) set/map Date: Thu, 29 Mar 2018 17:11:58 +0300 Lines: 44 Approved: news@gmane.org Message-ID: References: <4c98e549-8f0c-42e5-a054-0234f7cf1e46@isocpp.org> <9d4a8ea3-9e7d-4851-8b28-5cd67779081a@isocpp.org> <1356e140-2985-4fe7-b9ee-70e40738d1cf@isocpp.org> <7b853bcd-47f5-4c2c-841b-13e30472e14c@isocpp.org> <1df72d61-2659-4864-9a6d-f8ea8fe52792@isocpp.org> <8eb5c7cd-42ec-46bd-8aee-842ef11b885e@isocpp.org> <2ad48eb7-a635-4aaf-9216-7a390791c083@isocpp.org> <8698cc1b-bce1-4c23-bf81-2cab986afe5a@isocpp.org> <7b2a1e15-f345-4749-ab74-b5a53b5dbed0@isocpp.org> Reply-To: std-proposals@isocpp.org NNTP-Posting-Host: blaine.gmane.org Mime-Version: 1.0 Content-Type: text/plain; charset="UTF-8" X-Trace: blaine.gmane.org 1522332598 6150 195.159.176.226 (29 Mar 2018 14:09:58 GMT) X-Complaints-To: usenet@blaine.gmane.org NNTP-Posting-Date: Thu, 29 Mar 2018 14:09:58 +0000 (UTC) To: "ISO C++ Standard - Future Proposals" Original-X-From: std-proposals+bncBC5JHI7A7ALRBL7I6PKQKGQE6D5I3ZI@isocpp.org Thu Mar 29 16:09:54 2018 Return-path: Envelope-to: gclcip-std-proposals@m.gmane.org Original-Received: from mail-ot0-f197.google.com ([74.125.82.197]) by blaine.gmane.org with esmtp (Exim 4.84_2) (envelope-from ) id 1f1YFV-0001VB-Hb for gclcip-std-proposals@m.gmane.org; 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[209.85.220.65]) by mx.google.com with SMTPS id b44-v6sor2406491ote.15.2018.03.29.07.11.59 for (Google Transport Security); Thu, 29 Mar 2018 07:11:59 -0700 (PDT) Received-SPF: pass (google.com: domain of ville.voutilainen@gmail.com designates 209.85.220.65 as permitted sender) client-ip=209.85.220.65; X-Received: by 2002:a9d:38e5:: with SMTP id k34-v6mr4643536ote.99.1522332718990; Thu, 29 Mar 2018 07:11:58 -0700 (PDT) Original-Received: by 2002:a9d:183a:0:0:0:0:0 with HTTP; Thu, 29 Mar 2018 07:11:58 -0700 (PDT) In-Reply-To: X-Original-Sender: ville.voutilainen@gmail.com X-Original-Authentication-Results: mx.google.com; dkim=pass header.i=@gmail.com header.s=20161025 header.b=KEzutr88; spf=pass (google.com: domain of ville.voutilainen@gmail.com designates 209.85.220.65 as permitted sender) smtp.mailfrom=ville.voutilainen@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:37557 Archived-At: On 29 March 2018 at 16:59, Kevin Fitch wrote: > > > On Wednesday, March 28, 2018 at 5:31:48 PM UTC-4, Ben Craig wrote: >> >> Implementations that are targeted at embedded platforms that are fine with >> allocations, fine with exceptions or termination semantics, but not fine >> with floating point. > > To clarify, was that statement meant to be a question? Perhaps you meant to > say: Do there exist ... And, I would say, emphatically, there are > applications using implementations of the STL targeted at embedded platforms > where that is true. Most often I see applications that are fine with > allocations (with a few restrictions), but not fine with exceptions or > floating point. They key is that implementations targeted at embedded > platforms need to deal with applications that are (or are not) fine with > each of those (and many other things) independently. You can (with a little > effort) use all the features of the STL without using exceptions (e.g. using > operator[] instead of "at" to access members of a vector). You can use > allocators to deal with restrictions on allocation on the platform... >> >> >> Note however that libc++ and libstdc++ are both open source. If you are >> willing to maintain your own toolchain, you can fork them. If you modify >> the internals to not use floating point, and you never call the load factor >> methods, you won't get the floating point size hit. > > Sure, and something like that is probably going to have to be my short term > solution. I was just hoping to get to a place where I (and other developers) > might not have to do that in the future. My point was that the current > standard makes it impossible to create an implementation that can be used > fully while avoiding floating point. I see this at the same level as having > both operator[] and "at" so that the the user/application can decide what > features they want to pay for. Makes perfect sense to me. -- 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/CAFk2RUZP6qS5nA-0Pc2TcDrm%2BfFM-JRiWevyre1srHdCnW08eg%40mail.gmail.com. .