220 21189 <14814aa2-7f0f-444a-ac77-073fa41db54b@isocpp.org> article Path: news.gmane.org!not-for-mail From: Vlad from Moscow Newsgroups: gmane.comp.lang.c++.isocpp.proposals Subject: Re: Overloading of the family of numeric conversion functions std::stoXXX Date: Fri, 2 Oct 2015 09:00:10 -0700 (PDT) Lines: 117 Approved: news@gmane.org Message-ID: <14814aa2-7f0f-444a-ac77-073fa41db54b@isocpp.org> References: Reply-To: std-proposals@isocpp.org NNTP-Posting-Host: plane.gmane.org Mime-Version: 1.0 Content-Type: multipart/mixed; boundary="----=_Part_1034_182989883.1443801610687" X-Trace: ger.gmane.org 1443801625 3826 80.91.229.3 (2 Oct 2015 16:00:25 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Fri, 2 Oct 2015 16:00:25 +0000 (UTC) To: ISO C++ Standard - Future Proposals Original-X-From: std-proposals+bncBCXLLRHD7IDRBDOUXKYAKGQEJMD3REI@isocpp.org Fri Oct 02 18:00:16 2015 Return-path: Envelope-to: gclcip-std-proposals@m.gmane.org Original-Received: from mail-oi0-f70.google.com ([209.85.218.70]) by plane.gmane.org with esmtp (Exim 4.69) (envelope-from ) id 1Zi2ko-0002U8-J5 for gclcip-std-proposals@m.gmane.org; Fri, 02 Oct 2015 18:00:14 +0200 Original-Received: by oixx17 with SMTP id x17sf157989199oix.2 for ; Fri, 02 Oct 2015 09:00:13 -0700 (PDT) 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=jIRpZBNT7CV12+S3YxaU7N5Ma6T5VoVWJnxb0aA9YGc=; b=REpmCQC32JzWMhflsxMQXeXRsJ3msneHcmWIj8fJ7z7WnfBhQVoWOThujbf+89L0j0 DUgmlqV6tx1FCNDf+w/r6z5VG6+kloZuyhB7EQ/9DeSRe1vDjzb7+220eSQlGl9dSCcV +cyI12klJuBfMTQbZbDNBm/HmrNPuBFk90W0tw8cPKwf8OOfQ28zHVUmSTA4aSZkD9mQ qf3g3sb/d0D2Yqx5E4Mt3/uYM0uCOYTVaIO0ApfcFeidgEpROyoM//QW9htOlFwD9qJc jwU+cllCqePB7uyRF04VSbU2hoLYDuuEe6OWBn7HokfGag0d4J2JsmPpKgxMRWlJMD02 NjLA== X-Gm-Message-State: ALoCoQlrvJnr7k+BvPY9GYEH9zexCJu5pBZx/7utvQqmj07X2kV++15GfKAL+FWP4vjuH4YlWxrj X-Received: by 10.182.117.194 with SMTP id kg2mr14084457obb.49.1443801613803; Fri, 02 Oct 2015 09:00:13 -0700 (PDT) X-BeenThere: std-proposals@isocpp.org Original-Received: by 10.107.157.200 with SMTP id g191ls1050047ioe.51.gmail; Fri, 02 Oct 2015 09:00:11 -0700 (PDT) X-Received: by 10.50.43.137 with SMTP id w9mr71534igl.17.1443801611707; Fri, 02 Oct 2015 09:00:11 -0700 (PDT) In-Reply-To: X-Original-Sender: vlad.moscow@mail.ru 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:21189 Archived-At: ------=_Part_1034_182989883.1443801610687 Content-Type: multipart/alternative; boundary="----=_Part_1035_724783747.1443801610688" ------=_Part_1035_724783747.1443801610688 Content-Type: text/plain; charset=UTF-8 By the way I advice to add in the description of the view_string the functions I am proposing.:) On Friday, October 2, 2015 at 6:35:36 PM UTC+3, Jared Grubb wrote: > The string_view proposal adds overloads for these functions for > string_view, which would let you have everything you are asking for. ( > http://open-std.org/jtc1/sc22/wg21/docs/papers/2013/n3685.html#string.conversions > ) > > Jared > > On Friday, October 2, 2015 at 8:27:01 AM UTC-7, Vlad from Moscow wrote: >> >> The C++ Standard includes a family of conversion functions like >> std::stoi, std::stol, std::stoul and other similar functions. >> >> They allow to convert a string to some arithmetic type. >> >> However it is not always convinient to use them when you are going to >> apply the function to a string starting from some non-zero position. >> >> In this case you need to use either member function substr to get the >> desired substring. or to use another member function c_str that to >> apply the corresponding C function instead of the C++ function. >> >> So I think you have already understood that I want to suggest overloading >> functions that have one more parameter that specifies a position in the >> string. >> >> For example function stoi can now look like >> >> int stoi(const string& str, size_t* idx = 0, int base = 10); >> >> int stoi(const string& str, std::string::size_type pos, size_t* idx = 0, >> int base = 10); >> >> What do you think about this? >> >> -- --- You received this message because you are subscribed to the Google Groups "ISO C++ Standard - Future Proposals" group. 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By the way I advice to add in the description of the = view_string the functions I am proposing.:)

On Fri= day, October 2, 2015 at 6:35:36 PM UTC+3, Jared Grubb wrote:
The string_view proposal adds overload= s for these functions for string_view, which would let you have everything = you are asking for. (http://open-std.org/jtc1/s= c22/wg21/docs/papers/2013/n3685.html#string.conversions)

Ja= red

On Friday, October 2, 2015 at 8:27:01 AM UTC-7, Vlad from Moscow= wrote:
The C++ Standard = includes=C2=A0a family of conversion functions like std::stoi, std::stol, s= td::stoul and other similar functions.

They allow = to convert a string to some arithmetic type.

Howev= er it is not always convinient to use them when you are going to apply the = function to a string starting from some non-zero position.

In this case you need to use either member function substr to get = the desired substring. or to use=C2=A0another member function c_str that to= apply=C2=A0the corresponding C function instead of the C++ function.
=

So I think you have already understood that I want to s= uggest overloading functions that have one more parameter that specifies a = position in=C2=A0the string.

For example function = stoi can now=C2=A0 look like

int stoi(const string= & str, size_t* idx =3D 0, int base =3D 10);

in= t stoi(const string& str, std::string::size_type pos, size_t* idx =3D 0= , int base =3D 10);

What do you think about this?

--

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