220 41575 <77ca6c91-e1d6-4410-898d-b880b5af27d7@isocpp.org> article Path: news.gmane.org!.POSTED.blaine.gmane.org!not-for-mail From: Artem Golubikhin Newsgroups: gmane.comp.lang.c++.isocpp.proposals Subject: Re: operator[]= (array subscript assignment operator) Date: Sun, 17 Mar 2019 16:08:28 -0700 (PDT) Approved: news@gmane.org Message-ID: <77ca6c91-e1d6-4410-898d-b880b5af27d7@isocpp.org> References: <39460c2e-f24c-4819-8678-267387948e69@isocpp.org> <6a65b6a7-5fc2-415f-be8e-fbeaae76e20f@isocpp.org> <0ab12cb5-2b8e-47f2-b123-c3a54c832696@isocpp.org> Reply-To: std-proposals@isocpp.org Mime-Version: 1.0 Content-Type: multipart/mixed; boundary="----=_Part_1280_1662110632.1552864108608" Injection-Info: blaine.gmane.org; posting-host="blaine.gmane.org:195.159.176.226"; logging-data="251773"; mail-complaints-to="usenet@blaine.gmane.org" Cc: wpmgprostotema@gmail.com To: ISO C++ Standard - Future Proposals Original-X-From: std-proposals+bncBDC4PXOG5IMRB3VGXPSAKGQED6X2ROQ@isocpp.org Mon Mar 18 00:08:33 2019 Return-path: Envelope-to: gclcip-std-proposals@m.gmane.org Original-Received: from mail-yw1-f69.google.com ([209.85.161.69]) by blaine.gmane.org with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.89) (envelope-from ) id 1h5etN-0013NJ-1k for gclcip-std-proposals@m.gmane.org; Mon, 18 Mar 2019 00:08:33 +0100 Original-Received: by mail-yw1-f69.google.com with SMTP id p73sf10108699ywp.0 for ; Sun, 17 Mar 2019 16:08:32 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=isocpp-org.20150623.gappssmtp.com; s=20150623; h=date:from:to:cc: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=qrl7GNNyJ65uFhX3aoaBEtUgRUAVpHkPEjuJdbWtWgM=; b=iRXArYpxsc1+lPUKxYm/lHTEaae0qQdK/jAGMCswSrMcHAE0mJTZ5g/sECaYbuUBOX jz0ePApVpPXkv5WLtSAdyeX3r01GPWBJXMqtYsTn+hNAYBsOngbdBwxL2IFxDl0AgRuo DUgnsO6/30jP9UiAdrB3H0g1YVVBY2HPAGqK/mtFzSn5L3Cl+YraBxmTj5SPukTLzpl+ hS/k2yB2rmCVId8/McYU3pI6hHa+D85ixs3+/dG//oZ3Di1hUn9TwbWyyiBunLNs83mO qDL2nKXuxDLMKnLTDwUvFo4cyBeLc+nAfqq840/g/ttHnqlhQVSVa/S7oBTXfOPUIWsP zTTw== DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=date:from:to:cc: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=qrl7GNNyJ65uFhX3aoaBEtUgRUAVpHkPEjuJdbWtWgM=; b=RWHuxDpeDBpxOA1Ad1ELyBH8tWrtNA8ZlaJhpaEs/97v2qMVJ0Dkqr8hb118xdSkQw Ttr/xs0/IBGnMqBESY1XbMLsVXVVUa8uFjlezICkuIqQ8uPIL5VX2lOyjNkKLsO/c7MR Fa/ogO5jLXqh8DJUrxNcDJpB3nrvovVNiqE2P0gU2H3d8iWHp/tASRwgJJg8mc+apY+d jAX5xc24idopqEKESZWLNtbf3iOBCax0mfYtrV5XsekUHlthym9oBZxTKgRMorsLpMSF dXjfFosSKaT180CR2c42y+yJHM9rNHsbKXFBQhNmMty0nWCiTvm+dsNfhqVQOtFbnKoS D7qg== 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:cc: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=qrl7GNNyJ65uFhX3aoaBEtUgRUAVpHkPEjuJdbWtWgM=; b=tgJTybaK6xU7YEgUq0qynZdZOg+w8utzzDWFiU64EjBPrUsTYrBVoAvvewaK7SgBYY AJ8ItyVvTcl1OYJh30KlDTYeRRjGk8tz/2n1adunhmEY4U/Fd4ZsuVGLMx2kJ9qi36sw ayw2GZT1MGqtdurP0G9oaxkZ2p3NhS1jFKy5kJlxfw7ZDb7ORcs/lB4Is+1fNImGeGfN frRgJfykXT/LGKqUTgtuy56UGR3OIGx2FSXrSFlk8pkyMvIn8UO+1urJuDgL0fIvau5C GWoCDMEGRHhnaueWEj8kIlit27Wrg0HXoba2Y6gcQ3eeoPE+NXww9d7S6h4Ewmv0HgDx KKIQ== X-Gm-Message-State: APjAAAVrOhxguxkwm3y16P6w6ZFO84lrBr1ETOYPwnMHKOXLYmtnmTta ZmelfbF9dCvvcyy6jaqr6St7Dg== X-Google-Smtp-Source: APXvYqyZuJNIYgslfW3OziJ2hxRzW/6vgV9yVHSIUneq5aYkP/NLG3VNiSc73krz/Qd1CJPwOWBsJw== X-Received: by 2002:a81:1b4d:: with SMTP id b74mr7743351ywb.2.1552864111545; Sun, 17 Mar 2019 16:08:31 -0700 (PDT) X-BeenThere: std-proposals@isocpp.org Original-Received: by 2002:a81:570a:: with SMTP id l10ls3632762ywb.8.gmail; Sun, 17 Mar 2019 16:08:29 -0700 (PDT) X-Received: by 2002:a81:2e88:: with SMTP id u130mr11255690ywu.98.1552864109460; Sun, 17 Mar 2019 16:08:29 -0700 (PDT) In-Reply-To: <0ab12cb5-2b8e-47f2-b123-c3a54c832696@isocpp.org> X-Original-Sender: wpmgprostotema@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:41575 Archived-At: ------=_Part_1280_1662110632.1552864108608 Content-Type: multipart/alternative; boundary="----=_Part_1281_1670503988.1552864108608" ------=_Part_1281_1670503988.1552864108608 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: base64 T24gU2F0dXJkYXksIDE2LjAzLjIwMTkg0LMuLCAxNjozNzozMyBVVEMrMyBOaWNvbCBCb2xhcyB3 cm90ZToNCj4NCj4gT24gU2F0dXJkYXksIE1hcmNoIDE2LCAyMDE5IGF0IDM6NDg6NTAgQU0gVVRD LTQsIHdwbWdwcm8uLi5AZ21haWwuY29tIA0KPiB3cm90ZToNCj4+DQo+PiBhbmQgYCppdCsrID0g Zm9vO2ANCj4+Pg0KPj4NCj4+IEkgdG90YWxseSBtaXNzZWQgaXQuIEl0IGlzIHJlYWxseSBoYXJk IHRvIGZpbmQgYSBnZW5lcmFsIHNvbHV0aW9uIHdpdGggDQo+PiB0aGlzIHRocmVlLW9wZXJhdG9y IGNhc2UuLi4gDQo+Pg0KPg0KPiBJdCdzIHN0aWxsIGEgMiBvcGVyYXRvciBjYXNlLiBUaGUgKysg aXMgZXZhbHVhdGVkIGJlZm9yZSB0aGUgYCpgIGFuZCB0aGUgDQo+IGA9YC4gSXQncyBubyBkaWZm ZXJlbnQgZnJvbSBgKnNvbWVfZnVuYygpID0gZm9vO2AsIG9yIGBzb21lX2Z1bmMoKVsxMF0gPSAN Cj4gZm9vO2AuIEl0J3MgYWxsIGFib3V0IHJlY29nbml6aW5nIHRoZSBzZXF1ZW5jZSBvZiBldmFs dWF0aW5nIGEgbGVmdC1oYW5kIA0KPiBgKmAgb3IgYFtdYCBmb2xsb3dlZCBieSBhbiBgPWAgZXZh bHVhdGlvbi4NCj4NCg0KU29ycnksIEkgbWlzdW5kZXJzdG9vZCB5b3UuIEkgdGhvdWdodCB0aGVy ZSBpcyBhIG5lZWQgaW4gb3ZlcnJpZGluZyANCmJlaGF2aW9yIGZvciBgKml0KysgPSBmb287YCAo dHVybmluZyB0aHJlZSBvcHMgaW50byBhIHNpbmdsZSBmdW5jdGlvbiBjYWxsKSANCmNhc2UgdG9v Lg0KDQpBzLZizLZvzLZ1zLZ0zLYgzLZzzLZ5zLZuzLZ0zLZhzLZ4zLYszLYgzLZhzLZuzLZvzLZ0 zLZozLZlzLZyzLYgzLZpzLZkzLZlzLZhzLYgzLZjzLZvzLZtzLZlzLYgzLZ0zLZvzLYgzLZtzLZ5 zLYgDQrMtm3MtmnMtm7MtmTMtjrMtiDMtnfMtmXMtiDMtmPMtmHMtm7MtiDMtmnMtm7MtnTMtnLM tm/MtmTMtnXMtmPMtmXMtiDMtm7MtmXMtnfMtiANCsy2Y8y2b8y2bsy2dMy2Zcy2eMy2dMy2Lcy2 c8y2Zcy2bsy2c8y2acy2dMy2acy2dsy2Zcy2IMy2a8y2Zcy2ecy2d8y2b8y2csy2ZMy2IMy2YMy2 Ycy2Y8y2Y8y2Zcy2c8y2c8y2YMy2IA0KzLYozLZvzLZyzLYgzLZtzLZhzLZ5zLZizLZlzLYgzLZg zLZhzLZjzLZjzLZlzLZzzLZzzLZvzLZwzLZgzLYszLYgzLZgzLZhzLZjzLZjzLZlzLZzzLZzzLZv zLZwzLZlzLZyzLZgzLYszLYgDQrMtmDMtmHMtmPMtmPMtmXMtnPMtnPMtl/Mtm/MtnDMtmXMtnLM tmHMtnTMtm/MtnLMtmDMtinMtizMtiDMtnPMtm/MtiDMtmnMtm7MtnPMtnTMtmXMtmHMtmTMtiDM tm/MtmbMtiANCsy2YMy2b8y2cMy2Zcy2csy2Ycy2dMy2b8y2csy2W8y2Xcy2IMy2b8y2cMy2Zcy2 csy2Ycy2dMy2b8y2csy2Pcy2YMy2IMy2acy2dMy2IMy2d8y2acy2bMy2bMy2IMy2Ysy2Zcy2IA0K zLZgzLZvzLZwzLZlzLZyzLZhzLZ0zLZvzLZyzLY9zLYgzLZhzLZjzLZjzLZlzLZzzLZzzLZbzLZd zLZgzLYuzLYgzLZIzLZtzLYszLYgzLZvzLZyzLYgzLZ0zLZozLZlzLYgDQrMtmvMtmXMtnnMtnfM tm/MtnLMtmTMtiDMtmPMtmHMtm7MtiDMtmLMtmXMtiDMtmDMtmHMtnPMtnPMtmnMtmfMtm7Mtm3M tmXMtm7MtnTMtmDMtiDMtmHMtm7MtmTMtiDMtnTMtmjMtmXMtiANCsy2bsy2Ycy2bcy2Zcy2IMy2 b8y2Zsy2IMy2b8y2cMy2Zcy2csy2Ycy2dMy2b8y2csy2IMy2d8y2acy2bMy2bMy2IMy2Ysy2Zcy2 IMy2YMy2b8y2cMy2Zcy2csy2Ycy2dMy2b8y2csy2W8y2Xcy2IA0KzLZhzLZzzLZzzLZpzLZnzLZu zLZtzLZlzLZuzLZ0zLY9zLZgzLYuzLYgzLZPzLZyzLYgzLZtzLZhzLZ5zLZizLZlzLYgzLZlzLZ2 zLZlzLZuzLYgzLZgzLZvzLZwzLZlzLZyzLZhzLZ0zLZvzLZyzLYgDQrMtmHMtmPMtmPMtmXMtnPM tnPMtl/Mtm/MtnDMtmXMtnLMtmHMtnTMtm/MtnLMtlvMtl3MtiANCsy2Ycy2c8y2c8y2acy2Z8y2 bsy2bcy2Zcy2bsy2dMy2X8y2b8y2cMy2Zcy2csy2Ycy2dMy2b8y2csy2Pcy2YMy2IMy2KMy2aMy2 b8y2d8y2Zcy2dsy2Zcy2csy2IMy2K8y2K8y2IMy2Ycy2bsy2ZMy2IA0KzLYtzLYtzLYgzLZkzLZv zLZuzLYnzLZ0zLYgzLZmzLZpzLZ0zLYgzLZnzLZvzLZvzLZkzLYgzLZ3zLZpzLZ0zLZozLYgDQrM tmDMtmHMtnPMtnPMtmnMtmfMtm7Mtm3MtmXMtm7MtnTMtl/Mtm/MtnDMtmXMtnLMtmHMtnTMtm/M tnLMtmDMtiDMtnDMtmjMtnLMtmHMtnPMtmXMtinMti7Mtg0KDQpPbiBTdW5kYXksIDE3LjAzLjIw MTkg0LMuLCAxNjoyNzowNCBVVEMrMyBWaW5uaWUgRmFsY28gd3JvdGU6DQo+DQo+DQo+IE9uIEZy aWRheSwgTWFyY2ggMTUsIDIwMTkgYXQgODozMzoyMCBBTSBVVEMtNywgTmljb2wgQm9sYXMgd3Jv dGU6DQo+Pg0KPj4gRXNwZWNpYWxseSBzaW5jZSB0aGUgb2J2aW91cyBgb3BlcmF0b3IqPWAgaXMg YWxyZWFkeSB0YWtlbiA7KQ0KPj4NCj4NCj4gQSBzdHJhaWdodGZvcndhcmQgc29sdXRpb24gaXMg dG8gaW50cm9kdWNlIGEgc3RkIHRhZyB0eXBlOg0KPg0KPg0KPiAgICAgVCYgb3BlcmF0b3IqPShz dGQ6Om9wX2Fzc2lnbl9lcXVhbCwgLi4uKTsNCj4NCj4gUmVnYXJkcw0KPiBWaW5uaWUNCj4NCg0K VGhhdCBpcyBhIG5pY2UgaWRlYS4gVGhvdWdoIEkgdGhpbmsgaXQgc2hvdWxkIGJlIHVzZWQgYW5v dGhlciB3YXksIHNvIG5vIA0KYW55IG5ldyBzeW50YXggbGlrZSBgb3BlcmF0b3JbXT1gIGlzIGlu dHJvZHVjZWQ6DQovLyAqYSA9IHg7DQpUJiBvcGVyYXRvciooc3RkOjpvcF9zaW1wbGVfYXNzaWdu bWVudF90LCAuLi4pIHsgLyogLi4uICovIH0NCg0KLy8gYVtrXSA9IHY7DQpUJiBvcGVyYXRvcltd KHN0ZDo6b3Bfc2ltcGxlX2Fzc2lnbm1lbnRfdCwgLi4uKSB7IC8qIC4uLiAqLyB9DQoNCi8vIGFb aV0rKzsNClQgb3BlcmF0b3JbXShzdGQ6Om9wX3Bvc3RfaW5jcmVtZW50X3QsIC4uLikgeyAvKiAu Li4gKi8gfQ0KDQovLyBhW2ldIHw9IHg7DQpUJiBvcGVyYXRvcltdKHN0ZDo6b3BfYml0d2lzZV9v cl9hc3NpZ25tZW50X3QsIC4uLikgeyAvKiAuLi4gKi8gfQ0KDQpPbiBTdW5kYXksIDE3LjAzLjIw MTkg0LMuLCAxMjo0MjoyNyBVVEMrMyBGYXJpZCBNZWhyYWJpIHdyb3RlOg0KPg0KPiBFdmVuIG1v cmUgZ2VuZXJhbCBjb3VsZCBiZSB0byBvdmVybG9hZCBhIGNvbXBsZXggZXhwcmVzc2lvbiB3aGlj aCAgaXMgDQo+IGN1cnJlbnRseSBvbmx5IHBvc3NpYmxlIHZpYSBleHByZXNzaW9uIHRlbXBsYXRl cyBhbmQgbGF6eSBldmFsdWF0aW9uIA0KPiB0ZWNobmljcy4gT25lIG1pZ2h0IHRyeSB0byB1c2Ug b3BlcmF0b3Igb3ZlcmxvYWRpbmcgaW4gYSBtYXRyaXggY2FjdWxhdGlvbiANCj4gbGlicmFyeToN Cj4NCj4gbWF0cml4IGEsYixjLGQ7DQo+IC8vLi4uDQo+IGE9YitjKmQ7Ly8gY2FuIEkgb3Zlcmxv YWQgdGhpcyB0b28/DQo+DQo+IHJlZ2FyZHMsDQo+IEZNDQo+DQoNCkkgdGhpbmsgaXQgaXMgbm90 IGZvciB0aGlzIHByb3Bvc2FsLiBUaGlzIHByb3Bvc2FsIHNob3VsZCBjb3ZlciBvbmx5IHNpbXBs ZSANCmFjY2Vzcy1hbmQtbW9kaWZ5IG9wZXJhdGlvbnMgZm9yIGNvbnRhaW5lcnMgYW5kIGl0ZXJh dG9ycyBhcyBmb3IgbWUuIEkgd2FudCANCnRvIGxlYXZlIHRoZSBwcm9wb3NlZCBpZGVhIGFzIHNp bXBsZSBhcyBpdCBjYW4gYmUsIGJ1dCBvZiBjb3Vyc2Ugd2l0aG91dCANCmJyZWFraW5nIGZvcndh cmQgY29tcGF0aWJpbGl0eSBmb3IgdGhlIHBvc3NpYmxlIG1vcmUgY29tcGxleCBjb21wb3NpdGUg DQpvcGVyYXRvcnMgcHJvcG9zYWwgaW4gdGhlIGZ1dHVyZS4NCg0KDQoNCkFsc28gSSByZWFsaXpl ZCB0aGF0IHRoZSBwcm9wb3NlZCBmZWF0dXJlIGRvZXNuJ3QgY292ZXIgdGhlIGZ1bGwgDQpmdW5j dGlvbmFsaXR5IG9mIGBzdGQ6OmJpdHNldGAvYHN0ZDo6dmVjdG9yPGJvb2w+YCByZWZlcmVuY2Ug cHJveGllcy4gVGhlcmUgDQppcyBgZmxpcGAgbWVtYmVyIGZ1bmN0aW9uIGluIGJvb2wgKGJpdCkg cmVmZXJlbmNlIHByb3hpZXMsIGluc3RlYWQgd2UgY2FuIA0KZG8gYGJpdHNbaV0gXj0gdHJ1ZTtg LCBidXQgYGJpdHNbaV0uZmxpcCgpO2AgbG9va3MgbW9yZSByZWFkYWJsZS4gVGhvdWdoIA0KYGJp dHNbaV0gPSAhYml0c1tpXTtgIGxvb2tzIHJlYWRhYmxlIHRvbyBob3dldmVyIGl0IGRvZXNuJ3Qg bG9vayBEUlkuDQoNCi0tIApZb3UgcmVjZWl2ZWQgdGhpcyBtZXNzYWdlIGJlY2F1c2UgeW91IGFy ZSBzdWJzY3JpYmVkIHRvIHRoZSBHb29nbGUgR3JvdXBzICJJU08gQysrIFN0YW5kYXJkIC0gRnV0 dXJlIFByb3Bvc2FscyIgZ3JvdXAuClRvIHVuc3Vic2NyaWJlIGZyb20gdGhpcyBncm91cCBhbmQg c3RvcCByZWNlaXZpbmcgZW1haWxzIGZyb20gaXQsIHNlbmQgYW4gZW1haWwgdG8gc3RkLXByb3Bv c2Fscyt1bnN1YnNjcmliZUBpc29jcHAub3JnLgpUbyBwb3N0IHRvIHRoaXMgZ3JvdXAsIHNlbmQg ZW1haWwgdG8gc3RkLXByb3Bvc2Fsc0Bpc29jcHAub3JnLgpUbyB2aWV3IHRoaXMgZGlzY3Vzc2lv biBvbiB0aGUgd2ViIHZpc2l0IGh0dHBzOi8vZ3JvdXBzLmdvb2dsZS5jb20vYS9pc29jcHAub3Jn L2QvbXNnaWQvc3RkLXByb3Bvc2Fscy83N2NhNmM5MS1lMWQ2LTQ0MTAtODk4ZC1iODgwYjVhZjI3 ZDclNDBpc29jcHAub3JnLgo= ------=_Part_1281_1670503988.1552864108608 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
On Saturday, 16.03.2019 =D0=B3., 16:37:33 UTC+3 Nicol Bola= s wrote:
On Sa= turday, March 16, 2019 at 3:48:50 AM UTC-4, wpmgpro...@gmail.com wro= te:
and `*it++ =3D foo;`

I totally missed it. It is = really hard to find a general solution with this three-operator case...

It's still a 2 operator case. The ++ is evaluated before the `*` and the=20 `=3D`. It's no different from `*some_func() =3D foo;`, or `some_func()[= 10] =3D foo;`. It's all about recognizing the sequence of evaluating a=20 left-hand `*` or `[]` followed by an `=3D` evaluation.

Sorry, I misunderstood you. I thought ther= e is a need in overriding behavior for `*it++ =3D foo;` (turning three ops into a single function=20 call) case too.

A=CC=B6b=CC=B6o=CC=B6u=CC=B6t=CC= =B6 =CC=B6s=CC=B6y=CC=B6n=CC=B6t=CC=B6a=CC=B6x=CC=B6,=CC=B6=20 =CC=B6a=CC=B6n=CC=B6o=CC=B6t=CC=B6h=CC=B6e=CC=B6r=CC=B6 =CC=B6i=CC=B6d=CC= =B6e=CC=B6a=CC=B6 =CC=B6c=CC=B6o=CC=B6m=CC=B6e=CC=B6 =CC=B6t=CC=B6o=CC=B6 = =CC=B6m=CC=B6y=CC=B6 =CC=B6m=CC=B6i=CC=B6n=CC=B6d=CC=B6:=CC=B6 =CC=B6w=CC= =B6e=CC=B6=20 =CC=B6c=CC=B6a=CC=B6n=CC=B6 =CC=B6i=CC=B6n=CC=B6t=CC=B6r=CC=B6o=CC=B6d=CC= =B6u=CC=B6c=CC=B6e=CC=B6 =CC=B6n=CC=B6e=CC=B6w=CC=B6 =CC=B6c=CC=B6o=CC=B6n= =CC=B6t=CC=B6e=CC=B6x=CC=B6t=CC=B6-=CC=B6s=CC=B6e=CC=B6n=CC=B6s=CC=B6i=CC= =B6t=CC=B6i=CC=B6v=CC=B6e=CC=B6=20 =CC=B6k=CC=B6e=CC=B6y=CC=B6w=CC=B6o=CC=B6r=CC=B6d=CC=B6 =CC=B6`=CC=B6a=CC= =B6c=CC=B6c=CC=B6e=CC=B6s=CC=B6s=CC=B6`=CC=B6 =CC=B6(=CC=B6o=CC=B6r=CC=B6 = =CC=B6m=CC=B6a=CC=B6y=CC=B6b=CC=B6e=CC=B6=20 =CC=B6`=CC=B6a=CC=B6c=CC=B6c=CC=B6e=CC=B6s=CC=B6s=CC=B6o=CC=B6p=CC=B6`=CC= =B6,=CC=B6 =CC=B6`=CC=B6a=CC=B6c=CC=B6c=CC=B6e=CC=B6s=CC=B6s=CC=B6o=CC=B6p= =CC=B6e=CC=B6r=CC=B6`=CC=B6,=CC=B6=20 =CC=B6`=CC=B6a=CC=B6c=CC=B6c=CC=B6e=CC=B6s=CC=B6s=CC=B6_=CC=B6o=CC=B6p=CC= =B6e=CC=B6r=CC=B6a=CC=B6t=CC=B6o=CC=B6r=CC=B6`=CC=B6)=CC=B6,=CC=B6 =CC=B6s= =CC=B6o=CC=B6 =CC=B6i=CC=B6n=CC=B6s=CC=B6t=CC=B6e=CC=B6a=CC=B6d=CC=B6 =CC= =B6o=CC=B6f=CC=B6=20 =CC=B6`=CC=B6o=CC=B6p=CC=B6e=CC=B6r=CC=B6a=CC=B6t=CC=B6o=CC=B6r=CC=B6[=CC= =B6]=CC=B6 =CC=B6o=CC=B6p=CC=B6e=CC=B6r=CC=B6a=CC=B6t=CC=B6o=CC=B6r=CC=B6= =3D=CC=B6`=CC=B6 =CC=B6i=CC=B6t=CC=B6 =CC=B6w=CC=B6i=CC=B6l=CC=B6l=CC=B6 = =CC=B6b=CC=B6e=CC=B6=20 =CC=B6`=CC=B6o=CC=B6p=CC=B6e=CC=B6r=CC=B6a=CC=B6t=CC=B6o=CC=B6r=CC=B6=3D=CC= =B6 =CC=B6a=CC=B6c=CC=B6c=CC=B6e=CC=B6s=CC=B6s=CC=B6[=CC=B6]=CC=B6`=CC=B6.= =CC=B6 =CC=B6H=CC=B6m=CC=B6,=CC=B6 =CC=B6o=CC=B6r=CC=B6 =CC=B6t=CC=B6h=CC= =B6e=CC=B6=20 =CC=B6k=CC=B6e=CC=B6y=CC=B6w=CC=B6o=CC=B6r=CC=B6d=CC=B6 =CC=B6c=CC=B6a=CC= =B6n=CC=B6 =CC=B6b=CC=B6e=CC=B6 =CC=B6`=CC=B6a=CC=B6s=CC=B6s=CC=B6i=CC=B6g= =CC=B6n=CC=B6m=CC=B6e=CC=B6n=CC=B6t=CC=B6`=CC=B6 =CC=B6a=CC=B6n=CC=B6d=CC= =B6 =CC=B6t=CC=B6h=CC=B6e=CC=B6=20 =CC=B6n=CC=B6a=CC=B6m=CC=B6e=CC=B6 =CC=B6o=CC=B6f=CC=B6 =CC=B6o=CC=B6p=CC= =B6e=CC=B6r=CC=B6a=CC=B6t=CC=B6o=CC=B6r=CC=B6 =CC=B6w=CC=B6i=CC=B6l=CC=B6l= =CC=B6 =CC=B6b=CC=B6e=CC=B6=20 =CC=B6`=CC=B6o=CC=B6p=CC=B6e=CC=B6r=CC=B6a=CC=B6t=CC=B6o=CC=B6r=CC=B6[=CC= =B6]=CC=B6 =CC=B6a=CC=B6s=CC=B6s=CC=B6i=CC=B6g=CC=B6n=CC=B6m=CC=B6e=CC=B6n= =CC=B6t=CC=B6=3D=CC=B6`=CC=B6.=CC=B6 =CC=B6O=CC=B6r=CC=B6 =CC=B6m=CC=B6a=CC= =B6y=CC=B6b=CC=B6e=CC=B6=20 =CC=B6e=CC=B6v=CC=B6e=CC=B6n=CC=B6 =CC=B6`=CC=B6o=CC=B6p=CC=B6e=CC=B6r=CC= =B6a=CC=B6t=CC=B6o=CC=B6r=CC=B6 =CC=B6a=CC=B6c=CC=B6c=CC=B6e=CC=B6s=CC=B6s= =CC=B6_=CC=B6o=CC=B6p=CC=B6e=CC=B6r=CC=B6a=CC=B6t=CC=B6o=CC=B6r=CC=B6[=CC= =B6]=CC=B6=20 =CC=B6a=CC=B6s=CC=B6s=CC=B6i=CC=B6g=CC=B6n=CC=B6m=CC=B6e=CC=B6n=CC=B6t=CC= =B6_=CC=B6o=CC=B6p=CC=B6e=CC=B6r=CC=B6a=CC=B6t=CC=B6o=CC=B6r=CC=B6=3D=CC=B6= `=CC=B6 =CC=B6(=CC=B6h=CC=B6o=CC=B6w=CC=B6e=CC=B6v=CC=B6e=CC=B6r=CC=B6 =CC= =B6+=CC=B6+=CC=B6=20 =CC=B6a=CC=B6n=CC=B6d=CC=B6 =CC=B6-=CC=B6-=CC=B6 =CC=B6d=CC=B6o=CC=B6n=CC= =B6'=CC=B6t=CC=B6 =CC=B6f=CC=B6i=CC=B6t=CC=B6 =CC=B6g=CC=B6o=CC=B6o=CC= =B6d=CC=B6 =CC=B6w=CC=B6i=CC=B6t=CC=B6h=CC=B6=20 =CC=B6`=CC=B6a=CC=B6s=CC=B6s=CC=B6i=CC=B6g=CC=B6n=CC=B6m=CC=B6e=CC=B6n=CC= =B6t=CC=B6_=CC=B6o=CC=B6p=CC=B6e=CC=B6r=CC=B6a=CC=B6t=CC=B6o=CC=B6r=CC=B6`= =CC=B6 =CC=B6p=CC=B6h=CC=B6r=CC=B6a=CC=B6s=CC=B6e=CC=B6)=CC=B6.=CC=B6
=

On Sunday, 17.03.2019 =D0=B3., 16:27:04 UTC+3 Vinnie F= alco wrote:
On Friday, March 15, 2019 at 8:33:20 AM UTC-7, Nicol Bolas wrote:
Especially since= the obvious `operator*=3D` is already taken ;)

A straightforward solution is to introduce a std tag= type:


=C2=A0 =C2=A0 T& operato= r*=3D(std::op_assign_equal, ...);

Regards
Vinnie

That is a nice idea. Though I think it= should be used another way, so no any new syntax like `operator[]=3D` is i= ntroduced:
// *a =3D x;
T&= operator<= /span>*(std::op_simple_assignment_t, ...) { /* ... */ }=

// a[k] =3D v;
T& operator[](std::op_simple_assignment_t, ...) { /* ... */ }

// a[i]++;
T operator[](std::op_post_increment_t, ...)<= /span> { /* ... */ }

// a[i] |=3D x;
T& operator[](std<= /span>::op_bitwise_or_assig= nment_t, ...) { /* ... */ }

On Sunday, 17.03.= 2019 =D0=B3., 12:42:27 UTC+3 Farid Mehrabi wrote:
Even more general could be to overload a complex expression which =C2=A0is=20 currently only possible via expression templates and lazy evaluation=20 technics. One might try to use operator overloading in a matrix=20 caculation library:

matrix a,b,c,d;
//...
a=3Db+c*d;// can I overlo= ad this too?

regards,
FM


I think it is not for this proposal. This proposal should cover only=20 simple access-and-modify operations for containers and iterators as for=20 me. I want to leave the proposed idea as simple as it can be, but of=20 course without breaking forward compatibility for the possible more complex= composite operators proposal in the future.

<= div>

Also I realized that the proposed feature does= n't cover the full functionality of `std::bitset`/`std::vector<bool&= gt;` reference proxies. There is `flip` member function in bool (bit)=20 reference proxies, instead we can do `bits[i] ^=3D true;`, but=20 `bits[i].flip();` looks more readable. Though `bits[i] =3D !bits[i];`=20 looks readable too however it doesn't look DRY.

--
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/77ca6c91-e1d6-4410-898d-b880b5af27d7= %40isocpp.org.
------=_Part_1281_1670503988.1552864108608-- ------=_Part_1280_1662110632.1552864108608-- .