220 35521 article Path: news.gmane.org!.POSTED!not-for-mail From: Todd Fleming Newsgroups: gmane.comp.lang.c++.isocpp.proposals Subject: Re: operator[](...) Date: Sat, 25 Nov 2017 13:09:51 -0800 (PST) Lines: 158 Approved: news@gmane.org Message-ID: References: Reply-To: std-proposals@isocpp.org NNTP-Posting-Host: blaine.gmane.org Mime-Version: 1.0 Content-Type: multipart/mixed; boundary="----=_Part_20342_1573333560.1511644191962" X-Trace: blaine.gmane.org 1511644195 12217 195.159.176.226 (25 Nov 2017 21:09:55 GMT) X-Complaints-To: usenet@blaine.gmane.org NNTP-Posting-Date: Sat, 25 Nov 2017 21:09:55 +0000 (UTC) To: ISO C++ Standard - Future Proposals Original-X-From: std-proposals+bncBDN5JUVZSIFBBIFY47IAKGQE27TEX3A@isocpp.org Sat Nov 25 22:09:51 2017 Return-path: Envelope-to: gclcip-std-proposals@m.gmane.org Original-Received: from mail-ua0-f199.google.com ([209.85.217.199]) by blaine.gmane.org with esmtp (Exim 4.84_2) (envelope-from ) id 1eIhhr-0002bA-2I for gclcip-std-proposals@m.gmane.org; Sat, 25 Nov 2017 22:09:47 +0100 Original-Received: by mail-ua0-f199.google.com with SMTP id p9sf12235153uaj.17 for ; Sat, 25 Nov 2017 13:09:54 -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=KYNJx7bV/uDfrG83SxbSyLILfOHnbXbqgFd7VZAgMTQ=; b=hVhWMMfEvcCyDVfcpKCSJNGiiTFGYpLGTxkn5u2Wryf5GDWAeKRlaUN7hiWR900udj OEQ51y/qU/q6PshOAKfKx5FHQnV9CMHjKQMsTMV/3uKz8MinSMnRhWvZ+DWHGBVjVtKD H/vBoWJ/XWuvp4oELn4sn1jLCy+W2eHxvZp7gF6HZZMO24RY7z5d73Q4PO8gY23giPF8 wKGpFuqbyMljr8G5gvpx/NovVlyDsi4ktEu/RTEra5VFKk+TKXkaEwzAQAzd3IjSp49N qZEYftP0waMB4T+7hM1fodrtaoq0PzLZsGAS/dvg1ZDiyJlsmrPYEOdHzUG1ODHCPgOk Nt2A== 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=KYNJx7bV/uDfrG83SxbSyLILfOHnbXbqgFd7VZAgMTQ=; b=BfvVoAEY+XuylusJPrOgd5tYHJfcAgB2rtU/H0P2LoxLwJLy3dL9q7hMB0aDAr9nbU H+FK6yTtiqC7cxRrOIZsjzmZ/S21pXnLBbWuon3MiS/gTzPdELeXJkDqBtUBLvWVTfZ0 2CIEnDk5vNR+C9GejjEpb6ou632Xb2AyJCgbV3lc2nUMpVA/PD/G7WH4TWjSq1eDUEGi na/Ip8jQp8jLFEawtMPOaieTjZ9faSPYhiQsWM+sL9bnmk46FJQ30U1w3TdRATfVUEIv ioNKXe74oy3imvcbT+iIODmiSxUGrQYPYC+KYaUOI90K/ed/TUfCATfdyl8jy0+QqHvI 2Drg== 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=KYNJx7bV/uDfrG83SxbSyLILfOHnbXbqgFd7VZAgMTQ=; b=SAX9Rl/HQX84ccR3Cl0FQsXE7Pu581lC3q2rf71xnCiuVcDv24ZbvY1qS1uJaWJbb9 sG0pTs3ThY9XnN4f2aaI0tZOQQV0lxtjz/Shp8pQAVqW1KJ68/nWROGgwhqJevquCHAQ PNBREVxo2XviL6TX37EDZmp5ndPaokphcJwrdzqlD8EF69MzyfyFxln8ICrzKlf81xzL eSL/QX4Ac7dktozsarraga0ZnSgpct5Gw+MqMHkSyLZzri7xCYAnBVzyBvhsQdoSm7vO 8gRAXvpL41O24GTLkVpcfmngW4OkX2kZ0aH0zt9/QLUGbHW2XlknNXZydKKSbYajSMno OWHw== X-Gm-Message-State: AJaThX7Fk4Q9m4CpsjhOZ/bx5SruJ1K4kIOTY20m664xYmJIm9OlwNlh Z47H6A2RvTNxDIgQWBdjsCHHhw== X-Google-Smtp-Source: AGs4zMZ8/doF9FTh6o8B6ZfBjOaGTn2Raj45hhi7iEiggWEvOvrhNxOb9c4LbZeM+h/y2vFN5Lj7Pw== X-Received: by 10.31.15.18 with SMTP id 18mr15604133vkp.81.1511644194095; Sat, 25 Nov 2017 13:09:54 -0800 (PST) X-BeenThere: std-proposals@isocpp.org Original-Received: by 10.31.141.197 with SMTP id p188ls2921645vkd.9.gmail; Sat, 25 Nov 2017 13:09:52 -0800 (PST) X-Received: by 10.31.14.193 with SMTP id 184mr240509vko.14.1511644192440; Sat, 25 Nov 2017 13:09:52 -0800 (PST) In-Reply-To: X-Original-Sender: tbfleming@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:35521 Archived-At: ------=_Part_20342_1573333560.1511644191962 Content-Type: multipart/alternative; boundary="----=_Part_20343_742255268.1511644191962" ------=_Part_20343_742255268.1511644191962 Content-Type: text/plain; charset="UTF-8" On Saturday, November 25, 2017 at 2:08:25 PM UTC-5, Ryan Nicholl wrote: > > > My suggestion is to allow overloading operator [] with multiple arguments, > e.g.: > > class image > { > ... > public: > ... > > pixel & operator[](size_t x, size_t y) > { > return internal_data[x+y*width]; > } > }; > > /// used like: > > image my_image = ...; > ... > pixel px = my_image[5, 3]; > > Would be most useful where I see > [{...}] > > currently. E.g.: > output[{x,y}] = value; > when processing images. > > This conflicts with already valid syntax: int f(const std::vector& v) { return v[5, 3]; } Todd -- 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/a341b1ac-049f-4221-9e8c-8d6111f56eb4%40isocpp.org. ------=_Part_20343_742255268.1511644191962 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
On Saturday, November 25, 2017 at 2:08:25 PM UTC-5, Ryan N= icholl wrote:
=
My suggestion is to allow overloading operator [] with multiple argumen= ts, e.g.:

class image
{
=C2=A0 <= /span>...
<= /span>public:<= /span>
=C2=A0 ...

=C2=A0 pixel & operator[](size_t x, size_t y)
=C2=A0 {<= /span>
=C2=A0 =C2=A0 return internal_data[x+y*width];
=C2=A0 }
};

/// used like:

= image my_image =3D ...;
...
pixel px =3D my_image[5, 3];

Would be most useful where I see
[{...}]
=
currently. E.g.:
output[{x,y}] =3D value;
when processing images.
<= br>

This conflicts with already valid= syntax:

int f= (const std::vector<int>& v) {<= /span>
=C2=A0 =C2=A0return<= span style=3D"color: #000;" class=3D"styled-by-prettify"> v[5, 3];
}
=

Todd

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To view this discussion on the web visit https://groups.google.= com/a/isocpp.org/d/msgid/std-proposals/a341b1ac-049f-4221-9e8c-8d6111f56eb4= %40isocpp.org.
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