220 32180 <4d628cb7-c5ac-4d17-ad2e-5d04b9cc9c37@isocpp.org> article Path: news.gmane.org!.POSTED!not-for-mail From: Viktor Attila Jenei Newsgroups: gmane.comp.lang.c++.isocpp.proposals Subject: Idea and solution: Better STD functions and if clause Date: Tue, 25 Apr 2017 11:13:51 -0700 (PDT) Lines: 158 Approved: news@gmane.org Message-ID: <4d628cb7-c5ac-4d17-ad2e-5d04b9cc9c37@isocpp.org> Reply-To: std-proposals@isocpp.org NNTP-Posting-Host: blaine.gmane.org Mime-Version: 1.0 Content-Type: multipart/mixed; boundary="----=_Part_272_1834101693.1493144031405" X-Trace: blaine.gmane.org 1493144031 6429 195.159.176.226 (25 Apr 2017 18:13:51 GMT) X-Complaints-To: usenet@blaine.gmane.org NNTP-Posting-Date: Tue, 25 Apr 2017 18:13:51 +0000 (UTC) To: ISO C++ Standard - Future Proposals Original-X-From: std-proposals+bncBDKJ7DGAVQPRBX5D73DQKGQERRVHGXI@isocpp.org Tue Apr 25 20:13:47 2017 Return-path: Envelope-to: gclcip-std-proposals@m.gmane.org Original-Received: from mail-pg0-f72.google.com ([74.125.83.72]) by blaine.gmane.org with esmtp (Exim 4.84_2) (envelope-from ) id 1d34yB-0001YN-86 for gclcip-std-proposals@m.gmane.org; Tue, 25 Apr 2017 20:13:47 +0200 Original-Received: by mail-pg0-f72.google.com with SMTP id v20sf35431225pgn.2 for ; Tue, 25 Apr 2017 11:13:53 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=isocpp-org.20150623.gappssmtp.com; s=20150623; h=date:from:to:message-id: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=51WKme+QAWVcKyXEU4QuyXcDimGbwV3YaK5khS089AQ=; b=YSh+kmr8rSQzuXXWaHHn05e75u4+f6frrh0MA3a8IEN3VniZiXI/Uco1eJ8Ve81tRJ iScYFLZ9lJt8ZdHuuP1sxP/CccaOhfSWA9UL5+oMtY/ewJCZBUz6c2WWQshSUhjyYqQP 9gPDWzE1cOszg9WyDx36+w9UaRmLF02j+63uJcL/23RsnGAfg2K6GIRKT+M1VUG7Flzf BAUw+klBeAqQuw31ZAMizfIL/hxIP5yrAIRdC/39lmZPhLLovCJM/BgIvh3y4Pi0eDLX gbqdszEEIMwVXUiBZH4+M/aIvtQvcW7jMOpyMsJS2r+cqOrOQWxoEnIl/RdjIaxx7F51 HE0Q== DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=date:from:to:message-id: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=51WKme+QAWVcKyXEU4QuyXcDimGbwV3YaK5khS089AQ=; b=GYl0wCo5QXhzPjh9DhqgdQclGSYMFkSkGSIJ49M8j1CTH1WA4QMntb3fu+IJ1QE0nG Yx/HXBv56lZ20aGhcmEZ1wXI2jT0ZRLwKFgATi6tuvKaUmOM6nrpuzNgFaMLnQFZhZxU hBDOPkxwiEsyNzogQnn7N2wXpegmwJQVo51MWVUy+Yp9rsNW1IWnLxb2gOVIa/teZpXa Me02Qu0N3bXpzyk3/7Q1wieEZ5TuDW0R6tbovdJau8LyQK8KE/k1pMvMcFvtU13KOJZ+ UUYCy1uy48BKnN9e8Fyi0eVZHI4lUPf1pGkQ1Nu8i3Vni20TWdkCeXqrpvzDWgQCv4Ym Rf5w== 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: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=51WKme+QAWVcKyXEU4QuyXcDimGbwV3YaK5khS089AQ=; b=ozucDBakO7RVMxPRqmRhBytewSQDyQFaZ2NBr9cUKCjLEovG20S50ydamBjqkAMrQh S8/MYc8vuwaQ93ouwRm3AKL5Tl8HYEZCV4hPxJ4xp9w+wozF8EFq+UzyJN1tYQ5IDstN GfjV9Q5cgLlA02GNi+h6z8INxlUt73Q5H9CnNqO6Nl8AYNsNuj4LVqQXE5ttjvNVMgFI MipfxyVje06UTsWg2FBhrJQrXfOB1Gsl6NlVioqUf8nMA/bLWaeIJp+YvwwCZy9QbdHU mphdn7wZc+jt+kcKb1EW/nHAFSzVzivr1Kj71KONGMXHWdmfW60GIRmb/ygMcr6tV+gl rkrA== X-Gm-Message-State: AN3rC/5d/JWyhpi0aoHQH00lwnPuASSSw6f3o6HYIBWZDgjVmLXT071y EwZxGcz3MKUwzA== X-Received: by 10.99.66.66 with SMTP id p63mr15501411pga.141.1493144032851; Tue, 25 Apr 2017 11:13:52 -0700 (PDT) X-BeenThere: std-proposals@isocpp.org Original-Received: by 10.157.26.71 with SMTP id u7ls10278626otu.1.gmail; Tue, 25 Apr 2017 11:13:51 -0700 (PDT) X-Received: by 10.157.37.213 with SMTP id q79mr354621ota.11.1493144031839; Tue, 25 Apr 2017 11:13:51 -0700 (PDT) X-Original-Sender: jenei.viktor@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:32180 Archived-At: ------=_Part_272_1834101693.1493144031405 Content-Type: multipart/alternative; boundary="----=_Part_273_1078324013.1493144031405" ------=_Part_273_1078324013.1493144031405 Content-Type: text/plain; charset=UTF-8 Hello! There is a way to be a contributor to the C++ standards? I have some ideas, that i want to make. *1.* I think, it could be much better, if the can use std functions only with containers and not with begin and end iterators. Example the solution: namespace std { template< typename T > using Iterator = typename T::iterator; template< typename Cont, typename Pred > inline Iterator< Cont > find_if( Cont& c, Pred p ) { template< typename Cont, typename Pred > inline void for_each( Cont& c, Pred p ) { std::for_each( begin( c ), end( c ), p ); } template< typename Cont > inline Iterator< Cont > copy( Cont& in, Cont& out ) { return std::copy( begin( in ), end( in ), begin( out ) ); } template< typename Cont, typename Pred > inline Iterator< Cont > copy_if( Cont& in, Cont& out, Pred p ) { return std::copy_if( begin( in ), end( in ), begin( out ), p ); } } So the programmers can use these functions (and the others too), like: // v is a vector of int * for_each( v, []( int& e ) { cout << e << " "; } );* * sort( indices, [&v2]( int a, int b ) { return v2[ a ] < v2[ b ]; } );* * if (is_sorted( v )) { .... }* I think this will be cool, and nice, not? *2.* New if clause (with variable declaration): * string result="a.b.c.d";* * if ( ( auto f1 = result.rfind('.') ) != std::string::npos) result.replace(f1,1,"::");* * if ( ( auto f1 = result.rfind('.') ) != std::string::npos) result.replace(f1,1,":");* These lines could be eq with these code: string result="a.b.c.d"; { auto f1 = result.rfind('.'); if ( f1 != std::string::npos) result.replace(f1,1,"::"); } { auto f1 = result.rfind('.'); if ( f1 != std::string::npos) result.replace(f1,1,":"); } What do you think? I can implement all of these, if you want. So, I can improve the standards to make a better C++ language. :) Best regards Viktor Jenei -- 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/4d628cb7-c5ac-4d17-ad2e-5d04b9cc9c37%40isocpp.org. ------=_Part_273_1078324013.1493144031405 Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: quoted-printable
Hello!

=C2=A0 There is a way to be a co= ntributor to the C++ standards? I have some ideas, that i want to make.

1.
=C2=A0 I think, it could be much = better, if the can use std functions only with containers and not with begi= n and end iterators.
=C2=A0 Example the solution:
= namespace std
{
=C2=A0 =C2=A0 template< t= ypename T >
=C2=A0 =C2=A0 using Iterator =3D typename T::itera= tor;

=C2=A0 =C2=A0 template< typename Cont, typ= ename Pred >
=C2=A0 =C2=A0 inline Iterator< Cont > find_= if( Cont& c, Pred p )
=C2=A0 =C2=A0 {
=C2=A0 =C2=A0= =C2=A0 =C2=A0=C2=A0

=C2=A0 =C2=A0 template< ty= pename Cont, typename Pred >
=C2=A0 =C2=A0 inline void for_eac= h( Cont& c, Pred p )
=C2=A0 =C2=A0 {
=C2=A0 =C2=A0 = =C2=A0 =C2=A0 std::for_each( begin( c ), end( c ), p );
=C2=A0 = =C2=A0 }

=C2=A0 =C2=A0 template< typename Cont = >
=C2=A0 =C2=A0 inline Iterator< Cont > copy( Cont& = in, Cont& out )
=C2=A0 =C2=A0 {
=C2=A0 =C2=A0 =C2= =A0 =C2=A0 return std::copy( begin( in ), end( in ), begin( out ) );
<= div>=C2=A0 =C2=A0 }

=C2=A0 =C2=A0 template< typ= ename Cont, typename Pred >
=C2=A0 =C2=A0 inline Iterator< = Cont > copy_if( Cont& in, Cont& out, Pred p )
=C2=A0 = =C2=A0 {
=C2=A0 =C2=A0 =C2=A0 =C2=A0 return std::copy_if( begin( = in ), end( in ), begin( out ), p );
=C2=A0 =C2=A0 }
}

=C2=A0 So the programmers can use these funct= ions (and the others too), like:=C2=A0
=C2=A0 =C2=A0// v is a vec= tor of int
=C2=A0 =C2=A0for_each( v, []( int& e ) { cout &= lt;< e << " "; } );
=C2=A0 =C2=A0sort( = indices, [&v2]( int a, int b ) { return v2[ a ] < v2[ b ]; } );<= /div>
=C2=A0 =C2=A0if (is_sorted( v )) { .... }

=C2=A0 I think this will be cool, and nice, not?

2.=C2=A0
New if clause (with variable declaration)= :

=C2=A0 =C2=A0 string result=3D"a.b.= c.d";
=C2=A0 =C2=A0 if ( ( auto f1 =3D result.rfind(&= #39;.') ) !=3D std::string::npos) result.replace(f1,1,"::");<= /b>
=C2=A0 =C2=A0 if ( ( auto f1 =3D result.rfind('.')= ) !=3D std::string::npos) result.replace(f1,1,":");

=C2=A0 =C2=A0 These lines could be eq with these cod= e:
=C2=A0 =C2=A0 string result=3D"a.b.c.d";
<= div>=C2=A0 =C2=A0 {
=C2=A0 =C2=A0 =C2=A0 auto f1 =3D result.rfind= ('.');
=C2=A0 =C2=A0 =C2=A0 if ( f1 !=3D std::string::npo= s) result.replace(f1,1,"::");
=C2=A0 =C2=A0 }
=C2=A0 =C2=A0 {
=C2=A0 =C2=A0 =C2=A0 auto f1 =3D result.rfind(&#= 39;.');
=C2=A0 =C2=A0 =C2=A0 if ( f1 !=3D std::string::npos) = result.replace(f1,1,":");
=C2=A0 =C2=A0 }

What do you think? I can implement all of these, if you w= ant. So, I can improve the standards to make a better C++ language. :)

Best regards
Viktor Jenei

--
You received this message because you are subscribed to the Google Groups &= quot;ISO C++ Standard - Future Proposals" group.
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/4d628cb7-c5ac-4d17-ad2e-5d04b9cc9c37= %40isocpp.org.
------=_Part_273_1078324013.1493144031405-- ------=_Part_272_1834101693.1493144031405-- .