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{ "id": 23872, "url": "https://patchwork.libcamera.org/api/patches/23872/?format=api", "web_url": "https://patchwork.libcamera.org/patch/23872/", "project": { "id": 1, "url": "https://patchwork.libcamera.org/api/projects/1/?format=api", "name": "libcamera", "link_name": "libcamera", "list_id": "libcamera_core", "list_email": "libcamera-devel@lists.libcamera.org", "web_url": "", "scm_url": "", "webscm_url": "" }, "msgid": "<20250721104622.1550908-5-barnabas.pocze@ideasonboard.com>", "date": "2025-07-21T10:46:04", "name": "[RFC,v2,04/22] libcamera: base: cxx20: Add `type_identity{, _t}`", "commit_ref": null, "pull_url": null, "state": "superseded", "archived": false, "hash": "01fdecc7f03672b7e502b1a6dd8346b2b1b198db", "submitter": { "id": 216, "url": "https://patchwork.libcamera.org/api/people/216/?format=api", "name": "Barnabás Pőcze", "email": "barnabas.pocze@ideasonboard.com" }, "delegate": null, "mbox": "https://patchwork.libcamera.org/patch/23872/mbox/", "series": [ { "id": 5305, "url": "https://patchwork.libcamera.org/api/series/5305/?format=api", "web_url": "https://patchwork.libcamera.org/project/libcamera/list/?series=5305", "date": "2025-07-21T10:46:00", "name": "libcamera: Add `MetadataList`", "version": 2, "mbox": "https://patchwork.libcamera.org/series/5305/mbox/" } ], "comments": "https://patchwork.libcamera.org/api/patches/23872/comments/", "check": "pending", "checks": "https://patchwork.libcamera.org/api/patches/23872/checks/", "tags": {}, "headers": { "Return-Path": "<libcamera-devel-bounces@lists.libcamera.org>", "X-Original-To": "parsemail@patchwork.libcamera.org", "Delivered-To": "parsemail@patchwork.libcamera.org", "Received": [ "from lancelot.ideasonboard.com (lancelot.ideasonboard.com\n\t[92.243.16.209])\n\tby patchwork.libcamera.org (Postfix) with ESMTPS id 47719C3323\n\tfor <parsemail@patchwork.libcamera.org>;\n\tMon, 21 Jul 2025 10:46:36 +0000 (UTC)", "from lancelot.ideasonboard.com (localhost [IPv6:::1])\n\tby lancelot.ideasonboard.com (Postfix) with ESMTP id D323E68FF1;\n\tMon, 21 Jul 2025 12:46:35 +0200 (CEST)", "from perceval.ideasonboard.com (perceval.ideasonboard.com\n\t[213.167.242.64])\n\tby lancelot.ideasonboard.com (Postfix) with ESMTPS id 76EB068FDF\n\tfor <libcamera-devel@lists.libcamera.org>;\n\tMon, 21 Jul 2025 12:46:28 +0200 (CEST)", "from pb-laptop.local (185.221.140.39.nat.pool.zt.hu\n\t[185.221.140.39])\n\tby perceval.ideasonboard.com (Postfix) with ESMTPSA id 52FD47939;\n\tMon, 21 Jul 2025 12:45:51 +0200 (CEST)" ], "Authentication-Results": "lancelot.ideasonboard.com;\n\tdkim=fail reason=\"signature verification failed\" (1024-bit key;\n\tunprotected) header.d=ideasonboard.com header.i=@ideasonboard.com\n\theader.b=\"Yj79Ifrp\"; dkim-atps=neutral", "DKIM-Signature": "v=1; a=rsa-sha256; c=relaxed/simple; d=ideasonboard.com;\n\ts=mail; t=1753094751;\n\tbh=eNwTfZ3Uy5J86WZjbi4wfpIFD6Fkp868jbsDu91j8wo=;\n\th=From:To:Cc:Subject:Date:In-Reply-To:References:From;\n\tb=Yj79Ifrp/TSWHXa7tlyvs1jZMTpsnxr3O6i3HEwnJRRq/rlukSvdupvANjEXnf2GZ\n\tvyt/KzZwie9e1WMhV8H//E+hSxv/y7PdZ37gSqsP6yADGylds0bYe55EZkFBTcI0eP\n\t+AtK2ccYf1WVx35+6yFkyetHDLG3RRetzvOsaL/s=", "From": "=?utf-8?q?Barnab=C3=A1s_P=C5=91cze?= <barnabas.pocze@ideasonboard.com>", "To": "libcamera-devel@lists.libcamera.org", "Cc": "Jacopo Mondi <jacopo.mondi@ideasonboard.com>", "Subject": "[RFC PATCH v2 04/22] libcamera: base: cxx20: Add `type_identity{,\n\t_t}`", "Date": "Mon, 21 Jul 2025 12:46:04 +0200", "Message-ID": "<20250721104622.1550908-5-barnabas.pocze@ideasonboard.com>", "X-Mailer": "git-send-email 2.50.1", "In-Reply-To": "<20250721104622.1550908-1-barnabas.pocze@ideasonboard.com>", "References": "<20250721104622.1550908-1-barnabas.pocze@ideasonboard.com>", "MIME-Version": "1.0", "Content-Type": "text/plain; charset=UTF-8", "Content-Transfer-Encoding": "8bit", "X-BeenThere": "libcamera-devel@lists.libcamera.org", "X-Mailman-Version": "2.1.29", "Precedence": "list", "List-Id": "<libcamera-devel.lists.libcamera.org>", "List-Unsubscribe": "<https://lists.libcamera.org/options/libcamera-devel>,\n\t<mailto:libcamera-devel-request@lists.libcamera.org?subject=unsubscribe>", "List-Archive": "<https://lists.libcamera.org/pipermail/libcamera-devel/>", "List-Post": "<mailto:libcamera-devel@lists.libcamera.org>", "List-Help": "<mailto:libcamera-devel-request@lists.libcamera.org?subject=help>", "List-Subscribe": "<https://lists.libcamera.org/listinfo/libcamera-devel>,\n\t<mailto:libcamera-devel-request@lists.libcamera.org?subject=subscribe>", "Errors-To": "libcamera-devel-bounces@lists.libcamera.org", "Sender": "\"libcamera-devel\" <libcamera-devel-bounces@lists.libcamera.org>" }, "content": "`type_identity_t` can be used to force non-deduced contexts\nin templates, such as:\n\n void f(T x, type_identity_t<T> y)\n\nwhen calling `f(1u, 2)`, without `type_identity_t`, the compiler\ncould not unambiguously deduce `T` (unsigned int vs int). However,\nwith `type_identity_t`, the type of the argument passed to `y`\nwill not be used to deduce `T`, only the argument passed to `x`.\n\nSee https://en.cppreference.com/w/cpp/types/type_identity\n\nSigned-off-by: Barnabás Pőcze <barnabas.pocze@ideasonboard.com>\nReviewed-by: Jacopo Mondi <jacopo.mondi@ideasonboard.com>\n---\n include/libcamera/base/details/cxx20.h | 3 +++\n 1 file changed, 3 insertions(+)", "diff": "diff --git a/include/libcamera/base/details/cxx20.h b/include/libcamera/base/details/cxx20.h\nindex 0d6173d1b..2d26db53e 100644\n--- a/include/libcamera/base/details/cxx20.h\n+++ b/include/libcamera/base/details/cxx20.h\n@@ -9,4 +9,7 @@\n \n namespace libcamera::details::cxx20 {\n \n+template<typename T> struct type_identity { using type = T; };\n+template<typename T> using type_identity_t = typename type_identity<T>::type;\n+\n } /* namespace libcamera::details::cxx20 */\n", "prefixes": [ "RFC", "v2", "04/22" ] }