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{ "id": 2432, "url": "https://patchwork.libcamera.org/api/patches/2432/?format=api", "web_url": "https://patchwork.libcamera.org/patch/2432/", "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": "<20191217015106.1175515-2-niklas.soderlund@ragnatech.se>", "date": "2019-12-17T01:51:04", "name": "[libcamera-devel,v2,1/3] libcamera: utils: Add exchange()", "commit_ref": null, "pull_url": null, "state": "superseded", "archived": false, "hash": "83d2430f5f2962721231776d333aedf7044a713d", "submitter": { "id": 5, "url": "https://patchwork.libcamera.org/api/people/5/?format=api", "name": "Niklas Söderlund", "email": "niklas.soderlund@ragnatech.se" }, "delegate": { "id": 16, "url": "https://patchwork.libcamera.org/api/users/16/?format=api", "username": "neg", "first_name": "Niklas", "last_name": "Söderlund", "email": "niklas.soderlund@ragnatech.se" }, "mbox": "https://patchwork.libcamera.org/patch/2432/mbox/", "series": [ { "id": 590, "url": "https://patchwork.libcamera.org/api/series/590/?format=api", "web_url": "https://patchwork.libcamera.org/project/libcamera/list/?series=590", "date": "2019-12-17T01:51:03", "name": "libcamera: Add FileDescriptor to help pass numerical fds around", "version": 2, "mbox": "https://patchwork.libcamera.org/series/590/mbox/" } ], "comments": "https://patchwork.libcamera.org/api/patches/2432/comments/", "check": "pending", "checks": "https://patchwork.libcamera.org/api/patches/2432/checks/", "tags": {}, "headers": { "Return-Path": "<niklas.soderlund@ragnatech.se>", "Received": [ "from vsp-unauthed02.binero.net (vsp-unauthed02.binero.net\n\t[195.74.38.227])\n\tby lancelot.ideasonboard.com (Postfix) with ESMTPS id 1B484601ED\n\tfor <libcamera-devel@lists.libcamera.org>;\n\tTue, 17 Dec 2019 02:51:17 +0100 (CET)", "from bismarck.berto.se (p54ac5865.dip0.t-ipconnect.de\n\t[84.172.88.101]) by bin-vsp-out-01.atm.binero.net (Halon) with ESMTPA\n\tid b6548959-206f-11ea-a00b-005056917a89;\n\tTue, 17 Dec 2019 02:51:16 +0100 (CET)" ], "X-Halon-ID": "b6548959-206f-11ea-a00b-005056917a89", "Authorized-sender": "niklas@soderlund.pp.se", "From": "=?utf-8?q?Niklas_S=C3=B6derlund?= <niklas.soderlund@ragnatech.se>", "To": "libcamera-devel@lists.libcamera.org", "Date": "Tue, 17 Dec 2019 02:51:04 +0100", "Message-Id": "<20191217015106.1175515-2-niklas.soderlund@ragnatech.se>", "X-Mailer": "git-send-email 2.24.0", "In-Reply-To": "<20191217015106.1175515-1-niklas.soderlund@ragnatech.se>", "References": "<20191217015106.1175515-1-niklas.soderlund@ragnatech.se>", "MIME-Version": "1.0", "Content-Type": "text/plain; charset=UTF-8", "Content-Transfer-Encoding": "8bit", "Subject": "[libcamera-devel] [PATCH v2 1/3] libcamera: utils: Add exchange()", "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>", "X-List-Received-Date": "Tue, 17 Dec 2019 01:51:17 -0000" }, "content": "C++11 does not support std::exchange(), add a custom implementation in\nutils.\n\nSigned-off-by: Niklas Söderlund <niklas.soderlund@ragnatech.se>\nReviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>\n---\n src/libcamera/include/utils.h | 9 +++++++++\n src/libcamera/utils.cpp | 8 ++++++++\n 2 files changed, 17 insertions(+)", "diff": "diff --git a/src/libcamera/include/utils.h b/src/libcamera/include/utils.h\nindex a80f7d096bf725a1..32e3b009040d9efc 100644\n--- a/src/libcamera/include/utils.h\n+++ b/src/libcamera/include/utils.h\n@@ -66,6 +66,15 @@ const T& clamp(const T& v, const T& lo, const T& hi)\n \treturn std::max(lo, std::min(v, hi));\n }\n \n+/* C++11 doesn't provide std::exchange */\n+template<class T, class U = T>\n+T exchange(T &obj, U &&new_value)\n+{\n+\tT old_value = std::move(obj);\n+\tobj = std::forward<U>(new_value);\n+\treturn old_value;\n+}\n+\n using clock = std::chrono::steady_clock;\n using duration = std::chrono::steady_clock::duration;\n using time_point = std::chrono::steady_clock::time_point;\ndiff --git a/src/libcamera/utils.cpp b/src/libcamera/utils.cpp\nindex d632f6e66638038d..6ebb4e8ce39010c0 100644\n--- a/src/libcamera/utils.cpp\n+++ b/src/libcamera/utils.cpp\n@@ -95,6 +95,14 @@ char *secure_getenv(const char *name)\n * \\return lo if v is less than lo, hi if v is greater than hi, otherwise v\n */\n \n+/**\n+ * \\fn libcamera::utils::exchange(T &obj, U &&new_value)\n+ * \\brief Replace the value of \\a obj with \\a new_value and return the old value\n+ * \\param[inout] obj Object whose value to replace\n+ * \\param[in] new_value The value to assign to obj\n+ * \\return The old value of \\a obj\n+ */\n+\n /**\n * \\typedef clock\n * \\brief The libcamera clock (monotonic)\n", "prefixes": [ "libcamera-devel", "v2", "1/3" ] }