220 36851 <1cdb6300-7397-46d7-bce9-62e6e8dac40b@isocpp.org> article Path: news.gmane.org!.POSTED!not-for-mail From: inkwizytoryankes@gmail.com Newsgroups: gmane.comp.lang.c++.isocpp.proposals Subject: Re: String interpolation Date: Fri, 9 Feb 2018 12:51:55 -0800 (PST) Lines: 246 Approved: news@gmane.org Message-ID: <1cdb6300-7397-46d7-bce9-62e6e8dac40b@isocpp.org> References: <356d5835-f1bf-4699-94f5-0b2d3d0b9c0e@isocpp.org> <25CCF885-86AD-4D51-8F5C-C46376D34DE0@gmail.com> <4890431.TR9UepuQra@tjmaciei-mobl1> Reply-To: std-proposals@isocpp.org NNTP-Posting-Host: blaine.gmane.org Mime-Version: 1.0 Content-Type: multipart/mixed; boundary="----=_Part_5425_1042536176.1518209515594" X-Trace: blaine.gmane.org 1518209425 15848 195.159.176.226 (9 Feb 2018 20:50:25 GMT) X-Complaints-To: usenet@blaine.gmane.org NNTP-Posting-Date: Fri, 9 Feb 2018 20:50:25 +0000 (UTC) To: ISO C++ Standard - Future Proposals Original-X-From: std-proposals+bncBDDLTAGNTIBBB3ET7DJQKGQEZ7VCJJA@isocpp.org Fri Feb 09 21:50:21 2018 Return-path: Envelope-to: gclcip-std-proposals@m.gmane.org Original-Received: from mail-vk0-f71.google.com ([209.85.213.71]) by blaine.gmane.org with esmtp (Exim 4.84_2) (envelope-from ) id 1ekFcH-0002DW-Fh for gclcip-std-proposals@m.gmane.org; Fri, 09 Feb 2018 21:49:53 +0100 Original-Received: by mail-vk0-f71.google.com with SMTP id e71sf4968654vkd.4 for ; Fri, 09 Feb 2018 12:51:59 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=isocpp-org.20150623.gappssmtp.com; s=20150623; h=date:from:to:message-id:in-reply-to:references:subject:mime-version :x-original-sender:reply-to:precedence:mailing-list:list-id :list-post:list-help:list-archive:list-subscribe:list-unsubscribe; bh=MOYSZxYh+3mnV1FrQ58MhwQW076lWF41/693kk85Khs=; b=zxm3ukER+rac+sV7OW9UKBxVU6++ffOEFen+pFUYTaTcpF44KWD2vXTetjQMKhPBSc XMLP4Iq/rpVye1zVRPyHaK54xCD/9E7qC7huIXmOgexg/J81MH0HMjoCmdeCf0t8pUK/ EZxI9OpXgqJQVKXyLGeDhMAjXGrZD4NIgp44Qk+aX00mR1r2SpumWCHJ/smDXGY2D5Eq AtcgGPwODwthSR9JR4807+cjCu6SSWVe7/kPadXd+A4mkGL8b1cn/v2S0z+2TopaI+cX lFA/YGkkC9kqHMbK4qQ8ZqDrIDxUHnSmPQ0TBFfuAOyL2VzKVY7dW9LBdrsvGK1o9BsS 5NOQ== DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=date:from:to:message-id:in-reply-to:references:subject:mime-version :x-original-sender:reply-to:precedence:mailing-list:list-id :list-post:list-help:list-archive:list-subscribe:list-unsubscribe; bh=MOYSZxYh+3mnV1FrQ58MhwQW076lWF41/693kk85Khs=; b=c70dMrgbgXIo/8nbUNKgyR/i0Tg9dcsKvWFeXoLlBp/t9o4y+2Q2I1zqHbwc/4z1z8 SzZVReKp0Z3NDOKwPbpdRSpnHWWwy4f4OqdaQKvOJM4a7Vrmd/QbUoDO0pwgfKM0TzCD 6ohtyMZaFxqenpgqQ1lOYoH/d6HUbSWaX5kofhhXJLi2IO5iOyydULjP3LUhyzArWhxY LW3nSYSgGbIC7O6YcxtbzoAtRU2uvQJc4ESoyyGAaYjeU/bokX6hIhVLBVRbZYAhtPmd vd7/HOBTJJhNvVnyn2lnEZm5Py+JupML5t0bYQGr5CfS+MylnXsrV23W1VrE5RKIcHYy rjVg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:from:to:message-id:in-reply-to:references :subject:mime-version: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=MOYSZxYh+3mnV1FrQ58MhwQW076lWF41/693kk85Khs=; b=CGO7Wzke32fBNBDMHMfB6WCd77818oSiqXefiUJ8trKx3isRYILtbSu+AfM285q+Kn 8nH+SR9nuVMtbk19Ez+lkgTh4wdTj2ulZ0RGy27A/Kk/kh0f/LI1PVo5hnY/yHrb99WI MljaR6z6n11oqq4MDh96fMobvLwPzpD6o3YUhq8awJq8Bz2BxYbPHM0caMBGfET6rWG/ bUnJc+uk3Y3bG0RQ4rD/iB16wuzyapDueYpd56mryTh1ArB3/nGNBVUV5PPI2nHCk2X6 CS21LoEGKFAxeb8mMiG90sa1SARRuGlUvc1YV9trX3RfkgIlzHlLMhy3gbYQJvssrJvh Yz9w== X-Gm-Message-State: APf1xPBOu4VIrovyTaQW3ibiTUlKq8wYxoVw48nt2cqKmDTyRAL6GG1r dP+xXz3M97a3IzX3z1bYSL9Ghw== X-Google-Smtp-Source: AH8x224o0gX0k6SQ0ZZUhLyUU3/e8I1Om56JGbSphVvj8yYHRuJCGVD71pG5zG7ggB4jp+87n99asw== X-Received: by 10.31.67.211 with SMTP id q202mr2026025vka.42.1518209518894; Fri, 09 Feb 2018 12:51:58 -0800 (PST) X-BeenThere: std-proposals@isocpp.org Original-Received: by 10.31.185.211 with SMTP id j202ls4083224vkf.16.gmail; Fri, 09 Feb 2018 12:51:56 -0800 (PST) X-Received: by 10.31.65.193 with SMTP id o184mr330vka.9.1518209516115; Fri, 09 Feb 2018 12:51:56 -0800 (PST) In-Reply-To: X-Original-Sender: inkwizytoryankes@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:36851 Archived-At: ------=_Part_5425_1042536176.1518209515594 Content-Type: multipart/alternative; boundary="----=_Part_5426_372986613.1518209515595" ------=_Part_5426_372986613.1518209515595 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Friday, February 9, 2018 at 9:08:29 PM UTC+1, Richard Hodges wrote: > > > I'm not saying your idea has no merit. I said that the proposal, as it= =20 > was > posted, has no future. Improve it > > Here's an idea. How about you approach this genuine desire to do a good= =20 > thing more positively. I know you can be negative. Anyone can.=20 > > I am interested to see how you can positively contribute to an idea that= =20 > seeks to help us all. > > =20 Minimal version than could be added to C++ is new string prefix `F`=20 (because we have `R`, `u`, `u8` and `U` already, and `$` is outside of=20 source characters) that enable mixing code with string literals. As Marcel Kr=C3=BCger wrote, language could transform this string literal t= o: F"testA{a}test{{B}}"_x; =3D> operator""_x("testA"_x, a, "test{B}"_x); //usi= ng=20 same postfix to parse sub-literals FR"aa(x{b}y)aa"_x; =3D> operator""_x(R"aa(x)aa"_x, b, R"aa(y)aa"_x); //it= =20 have precedence over `R` prefix Rest will be implemented by library, this mean `F"a {5} b"` will not=20 compile because there is no matching operator. stl could add this operator= =20 for `s` postfix, that will use `std::to_string` for conversing all=20 arguments: template std::string operator""s(Parts&&... p) { return std::to_string(std::forward< Parts>(p)) + ...; } int main() { auto x =3D F"Test {{a}} =3D {10+5}"s; //x =3D=3D "Test {a} =3D 15"s } No iosteam, and even more it could if someone relay desire to have=20 localizations: F"Test {356*10}"_loc("Prod {0} OK!", "fr") =3D=3D "Prod 3.560,00 OK!"; Only drawback is some template bloat but this is probably acceptable cost. --=20 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 e= mail 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/1cdb6300-7397-46d7-bce9-62e6e8dac40b%40isocpp.or= g. ------=_Part_5426_372986613.1518209515595 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable


On Friday, February 9, 2018 at 9:08:29 PM UTC+1, R= ichard Hodges wrote:
>=C2=A0I'm not saying your idea has no merit. I said that the proposal, as it= was
posted, has no future. Improv= e it

Here's an idea. How about you approach this g= enuine desire to do a good thing more positively. I know you can be negativ= e. Anyone can.=C2=A0

I am interested to see how = you can positively contribute to an idea that seeks to help us all.<= /div>

=C2=A0
Minimal version than could b= e added to C++ is new string prefix `F` (because we have `R`, `u`, `u8` and= `U` already, and `$` is outside of source characters) that enable mixing c= ode with string literals.
As Marcel Kr=C3=BCger wrote, language could tr= ansform this string literal to:
F"testA{a}test{{B}}"_x; =3D> o= perator&qu= ot;"_= x(<= span style=3D"color: #080;" class=3D"styled-by-prettify">"testA"<= /span>_x, a, "test{B}"_x); //using same postfix to parse sub-literals
FR"aa(x{b}y)aa"_x; =3D> operator""_x(R"aa(x)aa&= quot;_x, b, R"aa(y)aa"_x); //it have precedence over `R` prefix



Rest will be implemented by library, this mean `F"a {5} = b"` will not compile because there is no matching operator. stl could = add this operator for `s` postfix, that will use `std::to_string` for conve= rsing all arguments:
template<typename... = Parts>
std::string operator""s(Parts&&... p) { return std::to_string(std::= forward<= ;Parts>(p)) + ...; }

int main()
{
=C2=A0 =C2=A0 auto x =3D F"Test {{a}} =3D {10+5}"s; //x =3D=3D "Test {a} =3D 15"s
}
No iosteam, and even mo= re it could if someone relay desire to have localizations:

= F"Test {356*10}"<= /span>_loc= ("Prod {0} OK!", "fr") =3D=3D "Prod 3.560,00 OK!";

Only drawba= ck is some template bloat but this is probably acceptable cost.
<= br>

--
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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/1cdb6300-7397-46d7-bce9-62e6e8dac40b= %40isocpp.org.
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