220 31201 <79ea3493-66f4-4386-9210-f3a3b80e0f30@isocpp.org> article Path: news.gmane.org!.POSTED!not-for-mail From: Victor Dyachenko Newsgroups: gmane.comp.lang.c++.isocpp.proposals Subject: Re: Re: operator<< for std::string Date: Tue, 28 Feb 2017 02:40:01 -0800 (PST) Lines: 144 Approved: news@gmane.org Message-ID: <79ea3493-66f4-4386-9210-f3a3b80e0f30@isocpp.org> References: <7552b5b4-e778-46a2-a6f8-fabca5b16dc4@isocpp.org> <75e1c827-a2af-4dfa-9426-dc5a00a0d408@isocpp.org> <85aefeb5-3c83-47de-a91d-3aef22d6a1ec@isocpp.org> <5f77cec0-c0b3-4993-9c3e-318c7e985f7f@isocpp.org> <46ec3307-ecfe-493c-b260-f2a39578d5ba@isocpp.org> <73b06839-b51a-4cd9-8316-cb9b3250c157@isocpp.org> <210528a6-2a10-4e42-8227-6fa87258d161@isocpp.org> Reply-To: std-proposals@isocpp.org NNTP-Posting-Host: blaine.gmane.org Mime-Version: 1.0 Content-Type: multipart/mixed; boundary="----=_Part_1077_530352560.1488278402038" X-Trace: blaine.gmane.org 1488278406 8283 195.159.176.226 (28 Feb 2017 10:40:06 GMT) X-Complaints-To: usenet@blaine.gmane.org NNTP-Posting-Date: Tue, 28 Feb 2017 10:40:06 +0000 (UTC) Cc: olaf@join.cc To: ISO C++ Standard - Future Proposals Original-X-From: std-proposals+bncBCJ4XEO5S4ERBAVH2XCQKGQEP7DCEPQ@isocpp.org Tue Feb 28 11:40:01 2017 Return-path: Envelope-to: gclcip-std-proposals@m.gmane.org Original-Received: from mail-yw0-f198.google.com ([209.85.161.198]) by blaine.gmane.org with esmtp (Exim 4.84_2) (envelope-from ) id 1cifCJ-0001W8-BB for gclcip-std-proposals@m.gmane.org; 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Tue, 28 Feb 2017 02:40:03 -0800 (PST) X-BeenThere: std-proposals@isocpp.org Original-Received: by 10.157.42.168 with SMTP id e37ls698259otb.13.gmail; Tue, 28 Feb 2017 02:40:02 -0800 (PST) X-Received: by 10.157.32.161 with SMTP id x30mr62934ota.20.1488278402742; Tue, 28 Feb 2017 02:40:02 -0800 (PST) In-Reply-To: X-Original-Sender: Victor.Dyachenko@gmail.com Precedence: list Mailing-list: list std-proposals@isocpp.org; contact std-proposals+owners@isocpp.org List-ID: 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:31201 Archived-At: ------=_Part_1077_530352560.1488278402038 Content-Type: multipart/alternative; boundary="----=_Part_1078_787191150.1488278402038" ------=_Part_1078_787191150.1488278402038 Content-Type: text/plain; charset=UTF-8 On Tuesday, February 28, 2017 at 12:17:26 PM UTC+3, ol...@join.cc wrote: > > > > Op woensdag 22 februari 2017 08:35:52 UTC+1 schreef Victor Dyachenko: >> >> >> result_t res = call(...); >> if(failed(res)) throw myexception(string_buffer(32) << "Error: result is >> " << res); >> >> So I solved the problem more than 10 years ago for myself, but I think >> this would be useful for others too if was added to stdlib. >> > > Can you bind a rvalue to a non-const reference like that? > I love the syntax but I can't make it work.. > If you mean operator<<, it is a class member (see above). But you can make it free function as well using rvalue refs: std::string &operator<<(std::string &s, int n) { .... } inline std::string &operator<<(std::string &&s, int n) { return s << n; } -- 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/79ea3493-66f4-4386-9210-f3a3b80e0f30%40isocpp.org. ------=_Part_1078_787191150.1488278402038 Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: quoted-printable
On Tuesday, February 28, 2017 at 12:17:26 PM UTC+3, ol...@= join.cc wrote:


Op woensdag 22 februari 2017 08:35:52 UTC+1 schreef Victor Dyachen= ko:

res= ult_t res =3D call(...);
if(failed(res)) throw myexception(string_buffer(32) << "Error: result is " << res);

So I solved the problem more than 10 ye= ars ago for myself, but I think this would be useful for others too if was = added to stdlib.

Can you bi= nd a rvalue to a non-const reference like that?
I love the syntax= but I can't make it work..=C2=A0
If you m= ean operator<<, it is a class member (see above). But you can make it= free function as well using rvalue refs:

=
std::string &operator<<(std= ::string &s, int n)= {<= span style=3D"color: #000;" class=3D"styled-by-prettify"> .... }
inline std::= string &<= span style=3D"color: #008;" class=3D"styled-by-prettify">operator<<(std::string &&s, i= nt n) { return s << n; }
<= /code>

--
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