{"id":25748,"url":"https://patchwork.libcamera.org/api/patches/25748/?format=json","web_url":"https://patchwork.libcamera.org/patch/25748/","project":{"id":1,"url":"https://patchwork.libcamera.org/api/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":"<20260113000808.15395-29-laurent.pinchart@ideasonboard.com>","date":"2026-01-13T00:08:00","name":"[28/36] libcamera: value_node: Add mutable children accessors","commit_ref":null,"pull_url":null,"state":"new","archived":false,"hash":"93d3dfb6ee47c68326a7dd80277811a84d7e353c","submitter":{"id":2,"url":"https://patchwork.libcamera.org/api/people/2/?format=json","name":"Laurent Pinchart","email":"laurent.pinchart@ideasonboard.com"},"delegate":null,"mbox":"https://patchwork.libcamera.org/patch/25748/mbox/","series":[{"id":5703,"url":"https://patchwork.libcamera.org/api/series/5703/?format=json","web_url":"https://patchwork.libcamera.org/project/libcamera/list/?series=5703","date":"2026-01-13T00:07:32","name":"libcamera: Global configuration file improvements","version":1,"mbox":"https://patchwork.libcamera.org/series/5703/mbox/"}],"comments":"https://patchwork.libcamera.org/api/patches/25748/comments/","check":"pending","checks":"https://patchwork.libcamera.org/api/patches/25748/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 A33A4C32DE\n\tfor ;\n\tTue, 13 Jan 2026 00:09:18 +0000 (UTC)","from lancelot.ideasonboard.com (localhost [IPv6:::1])\n\tby lancelot.ideasonboard.com (Postfix) with ESMTP id 3A8AB61FFB;\n\tTue, 13 Jan 2026 01:09:18 +0100 (CET)","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 90CF161FBB\n\tfor ;\n\tTue, 13 Jan 2026 01:09:15 +0100 (CET)","from pendragon.ideasonboard.com (81-175-209-152.bb.dnainternet.fi\n\t[81.175.209.152])\n\tby perceval.ideasonboard.com (Postfix) with UTF8SMTPSA id E3F8EBCA\n\tfor ;\n\tTue, 13 Jan 2026 01:08:49 +0100 (CET)"],"Authentication-Results":"lancelot.ideasonboard.com; dkim=pass (1024-bit key;\n\tunprotected) header.d=ideasonboard.com header.i=@ideasonboard.com\n\theader.b=\"C75crtFw\"; dkim-atps=neutral","DKIM-Signature":"v=1; a=rsa-sha256; c=relaxed/simple; d=ideasonboard.com;\n\ts=mail; t=1768262930;\n\tbh=3Lf3x50+ATkUhpAAFRKWHCsJniBHxNzC3uzR9CcRQOM=;\n\th=From:To:Subject:Date:In-Reply-To:References:From;\n\tb=C75crtFwKFBv5F/cXEKgkJt52KmVafxKyjw50/IcEgK2IWlZwY99jvmQqaMt87NAR\n\t2+I5qR6eudt1mi2wdv8awDjz/++COVQOVcx+XpKFQQuzOgCBoGyPTI8n2rw4TaYiAO\n\tNLoHIeDO/9NKbc0tlGokT5QlG2KL23pl7lvE6wNc=","From":"Laurent Pinchart ","To":"libcamera-devel@lists.libcamera.org","Subject":"[PATCH 28/36] libcamera: value_node: Add mutable children accessors","Date":"Tue, 13 Jan 2026 02:08:00 +0200","Message-ID":"<20260113000808.15395-29-laurent.pinchart@ideasonboard.com>","X-Mailer":"git-send-email 2.51.2","In-Reply-To":"<20260113000808.15395-1-laurent.pinchart@ideasonboard.com>","References":"<20260113000808.15395-1-laurent.pinchart@ideasonboard.com>","MIME-Version":"1.0","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":"At two at() functions that return mutable pointer to child nodes, based\non an index for lists and a key for dictionaries.\n\nThe API differs from const children accessors that use operator[] and\nreturn a reference in order to allow better error handling: while the\nconst accessors return a reference to a global instance of an empty\nValueNode when the requested child doesn't exist, a mutable accessor\ncan't do the same without allowing modifying the empty global instance.\n\nSigned-off-by: Laurent Pinchart \n---\n include/libcamera/internal/value_node.h | 2 ++\n src/libcamera/value_node.cpp | 41 +++++++++++++++++++++++++\n 2 files changed, 43 insertions(+)","diff":"diff --git a/include/libcamera/internal/value_node.h b/include/libcamera/internal/value_node.h\nindex 56d200e1cf27..c285be4957ed 100644\n--- a/include/libcamera/internal/value_node.h\n+++ b/include/libcamera/internal/value_node.h\n@@ -228,9 +228,11 @@ public:\n \tConstDictAdapter asDict() const { return ConstDictAdapter{ list_ }; }\n \tConstListAdapter asList() const { return ConstListAdapter{ list_ }; }\n \n+\tValueNode *at(std::size_t index);\n \tconst ValueNode &operator[](std::size_t index) const;\n \n \tbool contains(std::string_view key) const;\n+\tValueNode *at(std::string_view key);\n \tconst ValueNode &operator[](std::string_view key) const;\n \n \tValueNode *add(std::unique_ptr child);\ndiff --git a/src/libcamera/value_node.cpp b/src/libcamera/value_node.cpp\nindex 3c56b47bf79d..50b23284f930 100644\n--- a/src/libcamera/value_node.cpp\n+++ b/src/libcamera/value_node.cpp\n@@ -384,6 +384,24 @@ template struct ValueNode::Accessor>;\n * \\return An adapter of unspecified type compatible with range-based for loops\n */\n \n+/**\n+ * \\brief Retrieve the element from list ValueNode by index\n+ * \\param[in] index The element index\n+ *\n+ * This function retrieves an element of the ValueNode. Only ValueNode\n+ * instances of List type associate elements with index, calling this function\n+ * on other types of instances or with an invalid index returns a null pointer.\n+ *\n+ * \\return The ValueNode as an element of the list\n+ */\n+ValueNode *ValueNode::at(std::size_t index)\n+{\n+\tif (type_ != Type::List || index >= size())\n+\t\treturn nullptr;\n+\n+\treturn list_[index].value.get();\n+}\n+\n /**\n * \\brief Retrieve the element from list ValueNode by index\n * \\param[in] index The element index\n@@ -419,6 +437,29 @@ bool ValueNode::contains(std::string_view key) const\n \treturn dictionary_.find(key) != dictionary_.end();\n }\n \n+/**\n+ * \\brief Retrieve a member by key from the dictionary\n+ * \\param[in] key The element key\n+ *\n+ * This function retrieves a member of a ValueNode by \\a key. Only ValueNode\n+ * instances of Dictionary type associate elements with keys, calling this\n+ * function on other types of instances or with a nonexistent key returns a null\n+ * pointer.\n+ *\n+ * \\return The ValueNode corresponding to the \\a key member\n+ */\n+ValueNode *ValueNode::at(std::string_view key)\n+{\n+\tif (type_ != Type::Dictionary)\n+\t\treturn nullptr;\n+\n+\tauto iter = dictionary_.find(key);\n+\tif (iter == dictionary_.end())\n+\t\treturn nullptr;\n+\n+\treturn iter->second;\n+}\n+\n /**\n * \\brief Retrieve a member by key from the dictionary\n * \\param[in] key The element key\n","prefixes":["28/36"]}