220 22099 <78099cf0-3d5a-4531-99e4-03ea92e83455@isocpp.org> article Path: news.gmane.org!not-for-mail From: Nicol Bolas Newsgroups: gmane.comp.lang.c++.isocpp.proposals Subject: Re: string view constructed from iterator pair? Date: Thu, 29 Oct 2015 09:54:29 -0700 (PDT) Lines: 78 Approved: news@gmane.org Message-ID: <78099cf0-3d5a-4531-99e4-03ea92e83455@isocpp.org> References: <476bb7a8-15ec-4f9c-a295-592495de3a86@isocpp.org> <0fdef179-8304-40fb-bc94-48d908e779d0@isocpp.org> <5ee68d17-bb78-4bb7-8ff4-994f1016a0ad@isocpp.org> Reply-To: std-proposals@isocpp.org NNTP-Posting-Host: plane.gmane.org Mime-Version: 1.0 Content-Type: multipart/mixed; boundary="----=_Part_653_1669803613.1446137669604" X-Trace: ger.gmane.org 1446137674 11958 80.91.229.3 (29 Oct 2015 16:54:34 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Thu, 29 Oct 2015 16:54:34 +0000 (UTC) To: ISO C++ Standard - Future Proposals Original-X-From: std-proposals+bncBCEKFTV6ZUMBBRU6ZGYQKGQEZFBAWEY@isocpp.org Thu Oct 29 17:54:34 2015 Return-path: Envelope-to: gclcip-std-proposals@m.gmane.org Original-Received: from mail-pa0-f71.google.com ([209.85.220.71]) by plane.gmane.org with esmtp (Exim 4.69) (envelope-from ) id 1ZrqTA-0005yi-5X for gclcip-std-proposals@m.gmane.org; Thu, 29 Oct 2015 17:54:32 +0100 Original-Received: by padda3 with SMTP id da3sf37110187pad.0 for ; Thu, 29 Oct 2015 09:54:31 -0700 (PDT) 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 :content-type: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=FwQgvC80I0+SBxLeBaP8QVfazl6gEFwjOMi5z+gMvq8=; b=UgyXiJcgB/N9h8NpQxjMq3mENchHd6UdI2sr8oazRLVB0v4hxxGQQUwQ0/nykg/yQ7 DKSQjQPjqutX5VY+j39VXgKOHVMh9VmhtYIx5AXZirotaODgicYE0l9TsonTUzEDCH4d GzP+YvX1nS1wgU7d/+rjn1nzf4Qnb77FkHwnxpsceq2MpoJIK1x5VGsnpgostwAQ2hId FBOpnpTqM2iJT0DRzH4M388Q2Kv3Zlak2Qsr9zcT2EFJ9jME4O0XbBDcWQIP83xT85LP vowQuDgavY6FOUvOFz+K1OHiQyBaTghdJ0Sk+HtvEDzZM+9ayxztiVlfmgt/XsCjCcD9 ay0Q== 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:content-type: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=FwQgvC80I0+SBxLeBaP8QVfazl6gEFwjOMi5z+gMvq8=; b=TJbaoorEVwzzjGCyk/1z4AwzyCjFFcD7Lic3rUrCZu7Trgcg36PrpXwzooZoPqkEid aqpIDc1TWJU+B6y34Sgr324Y2GpqvjJojZ+jWoQCIu7dP0IZOBTxa39p+9HdTmlPI3cM P+2ubZ9Agk9gOkflRWSXJWbBBjopBVWf7S96fSgYnGMfFd4i2h7uOreR+OAauedW398u IpTQjiMelEsjRUPFPkFiSCYoXI5m4Jh0ZIfNFMdzZYwlkHWMzr3GO2sM4rgOAMYohVJY YSsSlyJoo+VByv4U5LXL+aKrJIY0nqpfKhTvK2q+fDk4L/h0vhS7JQOuC6eEUMfAqtOQ 2zGw== X-Gm-Message-State: ALoCoQnrMVEew9BzsYFpb2F0eIMQMTPAso6PFXMkR1a97UFX/67FTPQpz6a4ZmL0c/I7hrmaLwHA X-Received: by 10.66.165.7 with SMTP id yu7mr2125202pab.45.1446137671226; Thu, 29 Oct 2015 09:54:31 -0700 (PDT) X-BeenThere: std-proposals@isocpp.org Original-Received: by 10.107.27.83 with SMTP id b80ls347134iob.20.gmail; Thu, 29 Oct 2015 09:54:30 -0700 (PDT) X-Received: by 10.50.30.5 with SMTP id o5mr114569igh.10.1446137670400; Thu, 29 Oct 2015 09:54:30 -0700 (PDT) In-Reply-To: X-Original-Sender: jmckesson@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:22099 Archived-At: ------=_Part_653_1669803613.1446137669604 Content-Type: multipart/alternative; boundary="----=_Part_654_1193284616.1446137669605" ------=_Part_654_1193284616.1446137669605 Content-Type: text/plain; charset=UTF-8 On Thursday, October 29, 2015 at 12:24:33 PM UTC-4, Brent Friedman wrote: > > Evan, > > Yes that does address the issue I was raising. Of course, if strings and > vectors used pointer iterators then we wouldn't need the if test or the > overload at all. > Even if those two types use pointer iterators, that shouldn't mean that contiguous iterators *ought* to be pointers. What about range adaptors? Some of those can be contiguous iterators, but they're certainly not pointers. Of course, you wouldn't be able to use range adaptors in string_views either. They're more for template code. So there's another strike against this overload. `string_view` is meant for arrays of characters, which in C++ is specified by pointers. Ultimately, what you want isn't for std::string and std::vector iterators to be pointers. You want them to be *convertible* to pointers (and vice-versa). -- --- 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_654_1193284616.1446137669605 Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: quoted-printable
On Thursday, October 29, 2015 at 12:24:33 PM UTC-4, Brent = Friedman wrote:
Evan,

Yes that does address the issue I was raising. O= f course, if strings and vectors used pointer iterators then we wouldn'= t need the if test or the overload at all.
Even if those two types use pointer iterators, that shouldn't mean tha= t contiguous iterators ought to be pointers. What about range adapto= rs? Some of those can be contiguous iterators, but they're certainly no= t pointers.

Of course, you wouldn't be able to use range adaptor= s in string_views either. They're more for template code. So there'= s another strike against this overload. `string_view` is meant for arrays o= f characters, which in C++ is specified by pointers.

Ultimately, wha= t you want isn't for std::string and std::vector iterators to be pointe= rs. You want them to be convertible to pointers (and vice-versa).

--

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