220 36921 article Path: news.gmane.org!.POSTED!not-for-mail From: j c Newsgroups: gmane.comp.lang.c++.isocpp.proposals Subject: Re: String interpolation Date: Thu, 15 Feb 2018 13:13:07 +0000 Lines: 187 Approved: news@gmane.org Message-ID: References: <356d5835-f1bf-4699-94f5-0b2d3d0b9c0e@isocpp.org> <25CCF885-86AD-4D51-8F5C-C46376D34DE0@gmail.com> <4890431.TR9UepuQra@tjmaciei-mobl1> <1cdb6300-7397-46d7-bce9-62e6e8dac40b@isocpp.org> <4bce681e-e729-4124-9322-69291fdb6678@isocpp.org> <758ab0a7-8946-43d4-b2ae-5a4acea11c20@isocpp.org> Reply-To: std-proposals@isocpp.org NNTP-Posting-Host: blaine.gmane.org Mime-Version: 1.0 Content-Type: multipart/alternative; boundary="f403043dcd08276bc705653ffd7f" X-Trace: blaine.gmane.org 1518700290 28968 195.159.176.226 (15 Feb 2018 13:11:30 GMT) X-Complaints-To: usenet@blaine.gmane.org NNTP-Posting-Date: Thu, 15 Feb 2018 13:11:30 +0000 (UTC) To: std-proposals@isocpp.org Original-X-From: std-proposals+bncBCR6HLXQUAORBZEOS3KAKGQEVZJBOQY@isocpp.org Thu Feb 15 14:11:26 2018 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 1emJJY-0005um-AQ for gclcip-std-proposals@m.gmane.org; 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[209.85.220.65]) by mx.google.com with SMTPS id y192sor324990ybe.193.2018.02.15.05.13.08 for (Google Transport Security); Thu, 15 Feb 2018 05:13:08 -0800 (PST) Received-SPF: pass (google.com: domain of james.a.cooper@gmail.com designates 209.85.220.65 as permitted sender) client-ip=209.85.220.65; X-Received: by 10.37.186.201 with SMTP id a9mr1820970ybk.183.1518700388116; Thu, 15 Feb 2018 05:13:08 -0800 (PST) Original-Received: by 2002:a25:db0d:0:0:0:0:0 with HTTP; Thu, 15 Feb 2018 05:13:07 -0800 (PST) In-Reply-To: X-Original-Sender: james.a.cooper@gmail.com X-Original-Authentication-Results: mx.google.com; dkim=pass header.i=@gmail.com header.s=20161025 header.b=kZf0DScP; spf=pass (google.com: domain of james.a.cooper@gmail.com designates 209.85.220.65 as permitted sender) smtp.mailfrom=james.a.cooper@gmail.com; dmarc=pass (p=NONE sp=QUARANTINE dis=NONE) header.from=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:36921 Archived-At: --f403043dcd08276bc705653ffd7f Content-Type: text/plain; charset="UTF-8" Will the compiler be expected to be able to convert scoped enums to strings by itself? Currently, it cannot even convert them to their underlying type. This doesn't compile without the 'operator<<' function #include enum class MyEnum : int { A = 10, B = 15 }; /* std::ostream& operator<<(std::ostream& os, MyEnum v) { return os << static_cast::type>(v); } */ int main() { std::cout << MyEnum::A << "\n"; return 0; } On Thu, Feb 15, 2018 at 11:33 AM, Jake Arkinstall wrote: > If there exists a table where a field named "ID" is not unique, someone > please fire the person who made it. > > On 15 Feb 2018 09:55, wrote: > >> Op vrijdag 9 februari 2018 23:12:26 UTC+1 schreef Marcin Jaczewski: >>> >>> More I think about this more it look as great addition to language: >>> std::string a; >>> int b = 0; >>> int c = 42; >>> db.run(F"select name as {a}, age as {b} from table where id = {c}"_sql); >>> >>> >> The query could return 0, 1 or more rows. How'd that work for 0 or 2+ >> rows? >> I find mixing expressions (or does it only work with variables) and >> string literals to not work well most of the time. >> >> -- >> 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/is >> ocpp.org/d/msgid/std-proposals/758ab0a7-8946-43d4-b2ae- >> 5a4acea11c20%40isocpp.org >> >> . >> > -- > 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/CAC%2B0CCOovuF% > 2BHGepUDQVjkSJoCbGHBNcemaUU9h_gBUPD9ns%2Bw%40mail.gmail.com > > . > -- 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/CAFQaeCBywEdaj1MD0bpyxcjXRkF1jGaCOcpk%3D4vHtSjEbYbcJw%40mail.gmail.com. --f403043dcd08276bc705653ffd7f Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
Will the compiler be expected to be able to convert s= coped enums to strings by itself?
Currently, it cannot even conve= rt them to their underlying type.

This doesn't= compile without the 'operator<<' function


#include <iostream>
enum class MyEnum= : int
{
=C2=A0=C2=A0=C2=A0 A =3D 10, B =3D 15
};

/*
std::ostream& operator<<(std::ostream& os, MyE= num v)
{
=C2=A0=C2=A0=C2=A0 return os << static_cast<std::un= derlying_type<MyEnum>::type>(v);
}
*/

int main()
{
=C2=A0=C2=A0=C2=A0 std::cout << MyEnum::A <&= lt; "\n";
=C2=A0=C2=A0=C2=A0 return 0;
}
=

On Thu, Feb 15, 2= 018 at 11:33 AM, Jake Arkinstall <jake.arkinstall@gmail.com>= ; wrote:
If ther= e exists a table where a field named "ID" is not unique, someone = please fire the person who made it.

On 15 Feb 2018 09:55, <= olafvdspek@gmail.= com> wrote:
<= div dir=3D"ltr">Op vrijdag 9 februari 2018 23:12:26 UTC+1 schreef Marcin Ja= czewski:
More = I think about this more it look as great addition to language:
std::string a;
int b =3D= 0;
int c =3D 42;
db.run(F"select name as {a}, age a= s {b} from table where id =3D {c}"_s= ql);

The query could return 0, 1 or more rows. How'd that work for 0 or 2+ = rows?
I find mixing expressions (or does it only work with variab= les) and string literals to not work well most of the time.=C2=A0

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To post to this group, send email to std-proposals@isocpp.org.
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