220 21179 article Path: news.gmane.org!not-for-mail From: Vlad from Moscow Newsgroups: gmane.comp.lang.c++.isocpp.proposals Subject: Overloading of the family of numeric conversion functions std::stoXXX Date: Fri, 2 Oct 2015 08:27:01 -0700 (PDT) Lines: 80 Approved: news@gmane.org Message-ID: Reply-To: std-proposals@isocpp.org NNTP-Posting-Host: plane.gmane.org Mime-Version: 1.0 Content-Type: multipart/mixed; boundary="----=_Part_327_125655239.1443799621170" X-Trace: ger.gmane.org 1443799630 3081 80.91.229.3 (2 Oct 2015 15:27:10 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Fri, 2 Oct 2015 15:27:10 +0000 (UTC) To: ISO C++ Standard - Future Proposals Original-X-From: std-proposals+bncBCXLLRHD7IDRBRWEXKYAKGQE2MN4DRY@isocpp.org Fri Oct 02 17:27:04 2015 Return-path: Envelope-to: gclcip-std-proposals@m.gmane.org Original-Received: from mail-vk0-f71.google.com ([209.85.213.71]) by plane.gmane.org with esmtp (Exim 4.69) (envelope-from ) id 1Zi2Eh-0001XN-MY for gclcip-std-proposals@m.gmane.org; Fri, 02 Oct 2015 17:27:03 +0200 Original-Received: by vkfp126 with SMTP id p126sf131887811vkf.3 for ; Fri, 02 Oct 2015 08:27:02 -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: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=9SVU14SBV8CvLVIoIXXSbT0NS9sMShFB0p079xpfbFk=; b=KmrCvl0XYsJUng4xksZyNH5s9HfOtHE2nJfRnso4pCUOcmC5IUWQAT4BvEix3BFhg/ TAHfvc+nGpbqvHKSlBvsCfKYnMk/2EapvjrRR8XklEzHSB3/bPTlhuxHHDap/5Iub+1c wB2PFpaHlNrGDVooymFZ40r5qMBdlVWY38PKRdlcpuK2vEucF554IolsirfrLkur5GLk pHMv9flYIviHzib28W2xnyQVQCE3NsbopusH3b0Vy9qvgVx5v2AnZKRffT7NvdEH9KcW js4zqeQHZbFh77/Wtk2eCaTa+gqWcyoIOHUF6sddaKY55d3uLDui+ZnFHu78Gqh+mZzu Wzkg== X-Gm-Message-State: ALoCoQkBJfPKqbVmzC/oz3lhiwyptdY6IOaQjHE385ooWDo1/MTC2zdyPzb7vP/OMda0gLwKA3dW X-Received: by 10.129.70.6 with SMTP id t6mr14335990ywa.5.1443799622613; Fri, 02 Oct 2015 08:27:02 -0700 (PDT) X-BeenThere: std-proposals@isocpp.org Original-Received: by 10.107.132.164 with SMTP id o36ls957123ioi.64.gmail; Fri, 02 Oct 2015 08:27:01 -0700 (PDT) X-Received: by 10.50.129.36 with SMTP id nt4mr67577igb.3.1443799621893; Fri, 02 Oct 2015 08:27:01 -0700 (PDT) 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:21179 Archived-At: ------=_Part_327_125655239.1443799621170 Content-Type: multipart/alternative; boundary="----=_Part_328_1072875596.1443799621170" ------=_Part_328_1072875596.1443799621170 Content-Type: text/plain; charset=UTF-8 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. 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_328_1072875596.1443799621170 Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: quoted-printable
The C++ Standard includes=C2=A0a family of conversion= functions like std::stoi, std::stol, std::stoul and other similar function= s.

They allow to convert a string to some arithmet= ic type.

However it is not always convinient to us= e them when you are going to apply the function to a string starting from s= ome non-zero position.

In this case you need to us= e 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 fun= ction instead of the C++ function.

So I think you = have already understood that I want to suggest overloading functions that h= ave one more parameter that specifies a position in=C2=A0the string.
<= div>
For example function stoi can now=C2=A0 look like
<= div>
int stoi(const string& str, size_t* idx =3D 0, int b= ase =3D 10);

int 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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To unsubscribe from this group and stop receiving emails from it, send an e= mail to std-proposa= ls+unsubscribe@isocpp.org.
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