{"id":24058,"url":"https://patchwork.libcamera.org/api/1.1/patches/24058/?format=json","web_url":"https://patchwork.libcamera.org/patch/24058/","project":{"id":1,"url":"https://patchwork.libcamera.org/api/1.1/projects/1/?format=json","name":"libcamera","link_name":"libcamera","list_id":"libcamera_core","list_email":"libcamera-devel@lists.libcamera.org","web_url":"","scm_url":"","webscm_url":""},"msgid":"<20250804233152.11538-2-laurent.pinchart@ideasonboard.com>","date":"2025-08-04T23:31:50","name":"[v4,1/2] libcamera: utils: Add scope_exit class","commit_ref":"6ef2d79a730b79e7cb075678f81b327637a3d29f","pull_url":null,"state":"accepted","archived":false,"hash":"8bd1c35becbf2350bc665d37c9b2f96362f77a4c","submitter":{"id":2,"url":"https://patchwork.libcamera.org/api/1.1/people/2/?format=json","name":"Laurent Pinchart","email":"laurent.pinchart@ideasonboard.com"},"delegate":null,"mbox":"https://patchwork.libcamera.org/patch/24058/mbox/","series":[{"id":5357,"url":"https://patchwork.libcamera.org/api/1.1/series/5357/?format=json","web_url":"https://patchwork.libcamera.org/project/libcamera/list/?series=5357","date":"2025-08-04T23:31:49","name":"libcamera: Introduce and use scope_exit","version":4,"mbox":"https://patchwork.libcamera.org/series/5357/mbox/"}],"comments":"https://patchwork.libcamera.org/api/patches/24058/comments/","check":"pending","checks":"https://patchwork.libcamera.org/api/patches/24058/checks/","tags":{},"headers":{"Return-Path":"","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 183A3BE086\n\tfor ;\n\tMon, 4 Aug 2025 23:32:11 +0000 (UTC)","from lancelot.ideasonboard.com (localhost [IPv6:::1])\n\tby lancelot.ideasonboard.com (Postfix) with ESMTP id 197E56921F;\n\tTue, 5 Aug 2025 01:32:09 +0200 (CEST)","from perceval.ideasonboard.com (perceval.ideasonboard.com\n\t[IPv6:2001:4b98:dc2:55:216:3eff:fef7:d647])\n\tby lancelot.ideasonboard.com (Postfix) with ESMTPS id 46E1061466\n\tfor ;\n\tTue, 5 Aug 2025 01:32:07 +0200 (CEST)","from pendragon.ideasonboard.com (81-175-209-231.bb.dnainternet.fi\n\t[81.175.209.231])\n\tby perceval.ideasonboard.com (Postfix) with UTF8SMTPSA id D804332FD\n\tfor ;\n\tTue, 5 Aug 2025 01:31:19 +0200 (CEST)"],"Authentication-Results":"lancelot.ideasonboard.com; dkim=pass (1024-bit key;\n\tunprotected) header.d=ideasonboard.com header.i=@ideasonboard.com\n\theader.b=\"nPMV0v0x\"; dkim-atps=neutral","DKIM-Signature":"v=1; a=rsa-sha256; c=relaxed/simple; d=ideasonboard.com;\n\ts=mail; t=1754350280;\n\tbh=PC79loi6tuM6S81Xde7CNaAGYlaYDb0e/KopDPB9vJ0=;\n\th=From:To:Subject:Date:In-Reply-To:References:From;\n\tb=nPMV0v0xgIKPzC93KMWg6ibparOcCyulJi3Qr4lU9mhmKKf8kY/WURhedmQtYsf4W\n\t5NvJH09CaCMUOehenFStrS3cRbykadCnU/XYc4jIW22CKdcsOVnZBWi1Uqz39mKmA4\n\tY9BzXeQhnC3r3mtBmeMYraNm6D3kcwAYImjB/+a0=","From":"Laurent Pinchart ","To":"libcamera-devel@lists.libcamera.org","Subject":"[PATCH v4 1/2] libcamera: utils: Add scope_exit class","Date":"Tue, 5 Aug 2025 02:31:50 +0300","Message-ID":"<20250804233152.11538-2-laurent.pinchart@ideasonboard.com>","X-Mailer":"git-send-email 2.49.1","In-Reply-To":"<20250804233152.11538-1-laurent.pinchart@ideasonboard.com>","References":"<20250804233152.11538-1-laurent.pinchart@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":"","List-Unsubscribe":",\n\t","List-Archive":"","List-Post":"","List-Help":"","List-Subscribe":",\n\t","Errors-To":"libcamera-devel-bounces@lists.libcamera.org","Sender":"\"libcamera-devel\" "},"content":"The scope_exit class is an implementation of the identically named C++\nlibrary fundamentals TS v3 class, as documented in [1]. It is a simpler\nversion of the libcamera-specific ScopeExitActions class and doesn't\nrequire dynamic heap memory allocation, making it more suitable for hot\npaths.\n\nThe class is not documented as it implements a C++ standard (even if\nexperimental) API.\n\n[1] https://en.cppreference.com/w/cpp/experimental/scope_exit/scope_exit.html\n\nSigned-off-by: Laurent Pinchart \nReviewed-by: Barnabás Pőcze \n---\nChanges since v3:\n\n- Use LIBCAMERA_DISABLE_COPY_AND_MOVE()\n\nChanges since v2:\n\n- Drop lvalue reference constraint in constructor\n- Delete move constructor\n---\n include/libcamera/base/utils.h | 38 ++++++++++++++++++++++++++++++++++\n 1 file changed, 38 insertions(+)","diff":"diff --git a/include/libcamera/base/utils.h b/include/libcamera/base/utils.h\nindex 8d5c35782ee3..f21c6dc016ec 100644\n--- a/include/libcamera/base/utils.h\n+++ b/include/libcamera/base/utils.h\n@@ -21,6 +21,7 @@\n #include \n #include \n \n+#include \n #include \n \n #ifndef __DOXYGEN__\n@@ -428,6 +429,43 @@ private:\n \tstd::vector> actions_;\n };\n \n+#ifndef __DOXYGEN__\n+template\n+class scope_exit\n+{\n+public:\n+\ttemplate>, scope_exit> &&\n+\t\t\t\t std::is_constructible_v> * = nullptr>\n+\texplicit scope_exit(Fn &&fn)\n+\t\t: exitFunction_(std::forward(fn))\n+\t{\n+\t\tstatic_assert(std::is_nothrow_constructible_v);\n+\t}\n+\n+\t~scope_exit()\n+\t{\n+\t\tif (active_)\n+\t\t\texitFunction_();\n+\t}\n+\n+\tvoid release()\n+\t{\n+\t\tactive_ = false;\n+\t}\n+\n+private:\n+\tLIBCAMERA_DISABLE_COPY_AND_MOVE(scope_exit)\n+\n+\tEF exitFunction_;\n+\tbool active_ = true;\n+};\n+\n+template\n+scope_exit(EF) -> scope_exit;\n+\n+#endif /* __DOXYGEN__ */\n+\n } /* namespace utils */\n \n #ifndef __DOXYGEN__\n","prefixes":["v4","1/2"]}