220 41082 <20181126030900.5181497.67732.66720@gmail.com> article Path: news.gmane.org!.POSTED!not-for-mail From: Tony V E Newsgroups: gmane.comp.lang.c++.isocpp.proposals Subject: Re: Re: d1193 (Unpublished) - Explicit Return Types for (Implicit) Conversions Date: Sun, 25 Nov 2018 22:09:00 -0500 Lines: 112 Approved: news@gmane.org Message-ID: <20181126030900.5181497.67732.66720@gmail.com> References: <331d08dc-54ad-4681-abe8-986b66bf354a@isocpp.org> <6d5ed13d-c31a-4218-88b0-e0dd4bef3f72@isocpp.org> Reply-To: std-proposals@isocpp.org NNTP-Posting-Host: blaine.gmane.org Mime-Version: 1.0 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable X-Trace: blaine.gmane.org 1543201618 30150 195.159.176.226 (26 Nov 2018 03:06:58 GMT) X-Complaints-To: usenet@blaine.gmane.org NNTP-Posting-Date: Mon, 26 Nov 2018 03:06:58 +0000 (UTC) To: Balog Pal , ISO C++ Standard - Future Proposals Original-X-From: std-proposals+bncBCUZ5QWKNQIM5R7N34CRUBGXPXIKU@isocpp.org Mon Nov 26 04:06:53 2018 Return-path: Envelope-to: gclcip-std-proposals@m.gmane.org Original-Received: from mail-it1-f198.google.com ([209.85.166.198]) by blaine.gmane.org with esmtp (Exim 4.84_2) (envelope-from ) id 1gR7Eb-0007i4-6e for gclcip-std-proposals@m.gmane.org; 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Also:

<= div style=3D"width: 100%; font-size: initial; font-family: Calibri, 'Slate = Pro', sans-serif, sans-serif; color: rgb(31, 73, 125); text-align: initial;= background-color: rgb(255, 255, 255);">class X {
   IntProxy operator int ()=E2=80=8E { retur= n IntProxy{17}; }
};

X x;
int y =3D = x;

I guess that also calls IntProxy -> int, which = in turn could return AnotherIntProxy=E2=80=8E, ... etc.

Which makes sense, actually. But it means we could any number of convers= ions, which is novel. Although it is like operator -> I guess.

= = =
Sent from my BlackBerry p= ortable Babbage Device
= = <= tr>
From: Balog Pal
<= b>Sent: Sunday, November 25, 2018 7:57 PM
To: ISO C++ = Standard - Future Proposals
Reply To: std-proposals@isocpp= ..org
Subject: [std-proposals] Re: d1193 (Unpublished) - Ex= plicit Return Types for (Implicit) Conversions

Yes, provide examples of actual u= se and some problem case that it actually solves.

= The example you did write is more than confusing to think about. That opera= tor triggers where context wants int and I provided S. So then what happens= : operator int is invoked, it returns a double that is in turn converted to= int. Wow. Why that there and back conversion is good?

=
If the intent is to return some int_proxy instance, that has an operat= or int itself, then it might make sense, but it is 2 user-defined conversio= ns that would not work with current rules, how you intend to cover that wit= hout impact on existing code?

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