From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.blaine.gmane.org!not-for-mail From: Utkarsh Singh Newsgroups: gmane.emacs.bugs Subject: bug#46301: 28.0.50; cc-mode: add support for c++ lambda expression Date: Thu, 04 Feb 2021 21:17:22 +0530 Message-ID: <87czxfx2b9.fsf@gmail.com> Mime-Version: 1.0 Content-Type: multipart/signed; boundary="==-=-="; micalg=pgp-sha256; protocol="application/pgp-signature" Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="19491"; mail-complaints-to="usenet@ciao.gmane.io" To: 46301@debbugs.gnu.org Original-X-From: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane-mx.org@gnu.org Thu Feb 04 20:03:51 2021 Return-path: Envelope-to: geb-bug-gnu-emacs@m.gmane-mx.org Original-Received: from lists.gnu.org ([209.51.188.17]) by ciao.gmane.io with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1l7juw-000504-PB for geb-bug-gnu-emacs@m.gmane-mx.org; Thu, 04 Feb 2021 20:03:50 +0100 Original-Received: from localhost ([::1]:57394 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1l7juv-00016T-Q4 for geb-bug-gnu-emacs@m.gmane-mx.org; 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boundary="=-=-=" --=-=-= Content-Type: text/plain Hi, This bugs only occurs when we assign lambda expression as default arguments in C++. I know there are better ways of using lambda but I was just playing with both C++ and Emacs on a hobby project. Consider this C++ code: template void bubble_sort(std :: vector &v, bool cmp(T, T)=[](T a, T b){return a < b;}) { bool swapped = true; for(size_t i = 0; i < v.size() && swapped; i++) { swapped = false; for(size_t j = 0; j < v.size()-i; j++){ if(cmp(v[j+1], v[j])) { std::swap(v[j], v[j+1]); swapped=true; } } } } Here cmp takes a lambda as default argument and if in c++-mode if we try using C-M-e(c-end-of-defun) it will get trapped into lambda. To solve this is added c-forward-to-nth ((memq where '(at-function-end outwith-function at-header in-header)) (when (c-syntactic-re-search-forward "{" nil 'eob) (backward-char) (forward-sexp) ;; continue to move sexp if we are looking ) and , (while (looking-at ")\\|,") (c-syntactic-re-search-forward "{" nil 'eob) (backward-char) (forward-sexp)) (setq n (1- n)))) By this I am trying to move forward lambda's which are separated by ',' or ended with ')'. I will also attaching the necessary diff to support the issue. -- Utkarsh Singh --=-=-= Content-Type: text/x-patch Content-Disposition: attachment; filename=cc-cmds.el.diff Content-Transfer-Encoding: quoted-printable Content-Description: support c++ lambda 1970a1971,1976 >=20 > (while (looking-at ")\\|,") > (c-syntactic-re-search-forward "{" nil 'eob) > (backward-char) > (forward-sexp)) >=20 --=-=-=-- --==-=-= Content-Type: application/pgp-signature; name="signature.asc" -----BEGIN PGP SIGNATURE----- iQFMBAEBCAA2FiEEO/UPT8Dq/qDVNhySSfZAAWYhrHYFAmAcFwoYHHV0a2Fyc2gx OTA2MDFAZ21haWwuY29tAAoJEEn2QAFmIax2LKAH+gP13j5MRGJ3S9KMIU903qWa inrIjV7PdbWBjxQ4k5Nisn5iPkD0VlqtRr04M6qhNc6Osq0Z9Cw1ZXJQuzAZdknl FLvpRbRl8+T3PEp7qHaCsPUvq/xZA4HfZzSIWH4cP57kKY6cqtnI2zJBU9HR1liG 5iBJGBB5Yr2udVtsSNjqIWwmWTWS7aMMgvWDsyysJaU+7EL5Z1mhkti1jPDOCWog EW4AjLZ2wnkA23Sp1r/PCsEYhUvvf8h/7j02VJYDjxpEO9BVfX9SHvsny6u4Gx0r sk99zfjwZMBSNRzPgn1ArrCnYBFdn8cQmSmnzRteg2ttMqLqn+KD0ZbkK/2lomk= =ATIg -----END PGP SIGNATURE----- --==-=-=--