220 24662 <8ffac287-1ea1-4c04-9a9b-817610e013f1@isocpp.org> article Path: news.gmane.org!not-for-mail From: Nicol Bolas Newsgroups: gmane.comp.lang.c++.isocpp.proposals Subject: Re: String class memory allocation Date: Thu, 25 Feb 2016 07:32:45 -0800 (PST) Lines: 153 Approved: news@gmane.org Message-ID: <8ffac287-1ea1-4c04-9a9b-817610e013f1@isocpp.org> References: <87io1dlxx7.fsf@gmail.com> Reply-To: std-proposals@isocpp.org NNTP-Posting-Host: plane.gmane.org Mime-Version: 1.0 Content-Type: multipart/mixed; boundary="----=_Part_867_1167178551.1456414365329" X-Trace: ger.gmane.org 1456414373 25772 80.91.229.3 (25 Feb 2016 15:32:53 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Thu, 25 Feb 2016 15:32:53 +0000 (UTC) To: ISO C++ Standard - Future Proposals Original-X-From: std-proposals+bncBCEKFTV6ZUMBBHV5XS3AKGQEUQGXJZY@isocpp.org Thu Feb 25 16:32:49 2016 Return-path: Envelope-to: gclcip-std-proposals@m.gmane.org Original-Received: from mail-ig0-f197.google.com ([209.85.213.197]) by plane.gmane.org with esmtp (Exim 4.69) (envelope-from ) id 1aYxuK-0000Mo-60 for gclcip-std-proposals@m.gmane.org; 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Thu, 25 Feb 2016 07:32:47 -0800 (PST) X-BeenThere: std-proposals@isocpp.org Original-Received: by 10.107.17.11 with SMTP id z11ls454695ioi.54.gmail; Thu, 25 Feb 2016 07:32:46 -0800 (PST) X-Received: by 10.50.102.106 with SMTP id fn10mr77450igb.5.1456414365994; Thu, 25 Feb 2016 07:32:45 -0800 (PST) In-Reply-To: <87io1dlxx7.fsf@gmail.com> 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:24662 Archived-At: ------=_Part_867_1167178551.1456414365329 Content-Type: multipart/alternative; boundary="----=_Part_868_564565729.1456414365330" ------=_Part_868_564565729.1456414365330 Content-Type: text/plain; charset=UTF-8 On Wednesday, February 24, 2016 at 2:18:34 PM UTC-5, Moritz Klammler wrote: > > Nicol Bolas > writes: > > > On Wednesday, February 24, 2016 at 12:36:26 PM UTC-5, Moritz Klammler > wrote: > >> > >> Given that we already have `std::array` and almost certainly will > >> have `std::string_view` soon, I think that this isssue is solved. > >> > > > > `string_view` will not obviate the need for a fixed-length string > > class. And `array` is not a string; it's an array of char. > > In case this wasn't clear, my point is of course that you can use > `std::array` to *store* the data and *atop of that* a `std::string_view` > to *access* it through the "string interface" the OP requested. Really? So naturally, this works, right? array arr = "A String"; Oh wait, it doesn't. And neither does this: array arr = {'N', 'U', 'L', 'L', '\0'}; string_view sv(arr); It'll compile, but `sv` will get its size from `arr.size()`, which most assuredly not the intended value of 4. Obviously you could write wrapper functions and/or types that make all of these work; nobody's arguing that it isn't possible to create such things. But the whole point of the question was whether such things *already exist* in the standard library, not whether the standard library has a bunch of pieces that could be assembled into such things. -- 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/8ffac287-1ea1-4c04-9a9b-817610e013f1%40isocpp.org. ------=_Part_868_564565729.1456414365330 Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: quoted-printable
On Wednesday, February 24, 2016 at 2:18:34 PM UTC-5, Morit= z Klammler wrote:
Nicol Bolas &= lt;jm= ck...@gmail.com> writes:

> On Wednesday, February 24, 2016 at 12:36:26 PM UTC-5, Moritz Klamm= ler wrote:
>>
>> Given that we already have `std::array` and almost certainly w= ill
>> have `std::string_view` soon, I think that this isssue is solv= ed.
>>
>
> `string_view` will not obviate the need for a fixed-length string
> class. =C2=A0And `array<char>` is not a string; it's an = array of char.

In case this wasn't clear, my point is of course that you can use
`std::array` to *store* the data and *atop of that* a `std::string_view= `
to *access* it through the "string interface" the OP requeste= d.

Really? So naturally, this works, right?

array<char, 20> arr =3D = "A St= ring"= ;

Oh wait, it doesn't. And neither does th= is:

a= rray<char<= span style=3D"color: #660;" class=3D"styled-by-prettify">, 20> arr =3D {'= N', 'U', 'L', 'L', '\0'};=
string_view sv(a= rr);

It'll compile, but `sv` will get its size from `arr.s= ize()`, which most assuredly not the intended value of 4.

Obviously = you could write wrapper functions and/or types that make all of these work;= nobody's arguing that it isn't possible to create such things. But= the whole point of the question was whether such things already exist in the standard library, not whether the standard library has a bunch of= pieces that could be assembled into such things.

--
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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/8ffac287-1ea1-4c04-9a9b-817610e013f1= %40isocpp.org.
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