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{ "id": 2226665, "url": "http://patchwork.ozlabs.org/api/covers/2226665/?format=api", "web_url": "http://patchwork.ozlabs.org/project/gcc/cover/bmm.hhunxrmijo.gcc.gcc-TEST.peppe.42.1.0@forge-stage.sourceware.org/", "project": { "id": 17, "url": "http://patchwork.ozlabs.org/api/projects/17/?format=api", "name": "GNU Compiler Collection", "link_name": "gcc", "list_id": "gcc-patches.gcc.gnu.org", "list_email": "gcc-patches@gcc.gnu.org", "web_url": null, "scm_url": null, "webscm_url": null, "list_archive_url": "", "list_archive_url_format": "", "commit_url_format": "" }, "msgid": "<bmm.hhunxrmijo.gcc.gcc-TEST.peppe.42.1.0@forge-stage.sourceware.org>", "list_archive_url": null, "date": "2026-04-22T18:06:01", "name": "[v1,0/1] WIP: libstdc++: add support for cv-qualified types in atomic_ref (P3323R1)", "submitter": { "id": 93222, "url": "http://patchwork.ozlabs.org/api/people/93222/?format=api", "name": "peppe via Sourceware Forge", "email": "forge-bot+peppe@forge-stage.sourceware.org" }, "mbox": "http://patchwork.ozlabs.org/project/gcc/cover/bmm.hhunxrmijo.gcc.gcc-TEST.peppe.42.1.0@forge-stage.sourceware.org/mbox/", "series": [ { "id": 501066, "url": "http://patchwork.ozlabs.org/api/series/501066/?format=api", "web_url": "http://patchwork.ozlabs.org/project/gcc/list/?series=501066", "date": "2026-04-22T18:06:01", "name": "WIP: libstdc++: add support for cv-qualified types in atomic_ref (P3323R1)", "version": 1, "mbox": "http://patchwork.ozlabs.org/series/501066/mbox/" } ], "comments": "http://patchwork.ozlabs.org/api/covers/2226665/comments/", "headers": { "Return-Path": "<gcc-patches-bounces~incoming=patchwork.ozlabs.org@gcc.gnu.org>", "X-Original-To": [ "incoming@patchwork.ozlabs.org", "gcc-patches@gcc.gnu.org" ], "Delivered-To": [ "patchwork-incoming@legolas.ozlabs.org", "gcc-patches@gcc.gnu.org" ], "Authentication-Results": [ "legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=gcc.gnu.org\n (client-ip=2620:52:6:3111::32; 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Wed, 22 Apr 2026 18:06:53 +0000 (GMT)", "from forge-stage.sourceware.org (localhost [IPv6:::1])\n (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits)\n key-exchange x25519 server-signature ECDSA (prime256v1) server-digest SHA256)\n (No client certificate requested)\n by forge-stage.sourceware.org (Postfix) with ESMTPS id 947B0433D4\n for <gcc-patches@gcc.gnu.org>; Wed, 22 Apr 2026 18:06:53 +0000 (UTC)" ], "DKIM-Filter": [ "OpenDKIM Filter v2.11.0 sourceware.org D20DE4BBC097", "OpenDKIM Filter v2.11.0 sourceware.org B9DC94BA2E2B" ], "DMARC-Filter": "OpenDMARC Filter v1.4.2 sourceware.org B9DC94BA2E2B", "ARC-Filter": "OpenARC Filter v1.0.0 sourceware.org B9DC94BA2E2B", "ARC-Seal": "i=1; a=rsa-sha256; d=sourceware.org; s=key; t=1776881213; cv=none;\n b=OTu53ZY4zHO9Wlq8koUBkqBJvQpB9ix9ecoQgMWogyAthmBCLVoRQidx/sPAKzAVCRW9ANElrdrjkHJY58UCYnInUdBL/N6LwmCSspAWeM4tzh2yC4LEHB6IZ9bL3L+lHXCMXW9OxG8D0pk84lk1QCZj3YZDcegTojkX1/4lfAs=", "ARC-Message-Signature": "i=1; a=rsa-sha256; d=sourceware.org; s=key;\n t=1776881213; c=relaxed/simple;\n bh=5GpuTfTjV8nD8WTO0396bLi+X0oEJSQp9FgPtfKB1rQ=;\n h=From:Date:Subject:To:Message-ID;\n b=YYnVmgV9oAHfm1ZQnH+X4sRmtb/QkbInu//z94N7GjOjz2PS8qdwkirXehWGjEMhrnZzErSDx67PweOegipDx4hVIluSzuBmFPRnWXlV0Hmfm9YEMGCfK+3UMCTTnVJc2lJGo4CXz8U6Dg9M6RPAVx09wMkWlSAX2QP0SmSWBaA=", "ARC-Authentication-Results": "i=1; server2.sourceware.org", "From": "peppe via Sourceware Forge <forge-bot+peppe@forge-stage.sourceware.org>", "Date": "Wed, 22 Apr 2026 18:06:01 +0000", "Subject": "[PATCH v1 0/1] WIP: libstdc++: add support for cv-qualified types in\n atomic_ref (P3323R1)", "To": "gcc-patches mailing list <gcc-patches@gcc.gnu.org>", "Message-ID": "\n <bmm.hhunxrmijo.gcc.gcc-TEST.peppe.42.1.0@forge-stage.sourceware.org>", "X-Mailer": "batrachomyomachia", "X-Pull-Request-Organization": "gcc", "X-Pull-Request-Repository": "gcc-TEST", "X-Pull-Request": "https://forge.sourceware.org/gcc/gcc-TEST/pulls/42", "X-BeenThere": "gcc-patches@gcc.gnu.org", "X-Mailman-Version": "2.1.30", "Precedence": "list", "List-Id": "Gcc-patches mailing list <gcc-patches.gcc.gnu.org>", "List-Unsubscribe": "<https://gcc.gnu.org/mailman/options/gcc-patches>,\n <mailto:gcc-patches-request@gcc.gnu.org?subject=unsubscribe>", "List-Archive": "<https://gcc.gnu.org/pipermail/gcc-patches/>", "List-Post": "<mailto:gcc-patches@gcc.gnu.org>", "List-Help": "<mailto:gcc-patches-request@gcc.gnu.org?subject=help>", "List-Subscribe": "<https://gcc.gnu.org/mailman/listinfo/gcc-patches>,\n <mailto:gcc-patches-request@gcc.gnu.org?subject=subscribe>", "Reply-To": "gcc-patches mailing list <gcc-patches@gcc.gnu.org>,\n peppe@noreply.localhost", "Errors-To": "gcc-patches-bounces~incoming=patchwork.ozlabs.org@gcc.gnu.org" }, "content": "Hi gcc-patches mailing list,\npeppe via Sourceware Forge <forge-bot+peppe@forge-stage.sourceware.org> has requested that the following forgejo pull request\nbe published on the mailing list.\n\nCreated on: 2025-03-08 19:50:44+00:00\nLatest update: 2025-09-25 13:50:58+00:00\nChanges: 11 changed files, 456 additions, 238 deletions\nHead revision: peppe/gcc-TEST ref atomic_ref_cv_qualified commit ed6c012d7290585f55872f690bee7b9e8f6bd1f7\nBase revision: gcc/gcc-TEST ref trunk commit 01044e0ee27093a3990996578b15f6ab69ed3395 r16-1114-g01044e0ee27093\nMerge base: 01044e0ee27093a3990996578b15f6ab69ed3395\nFull diff url: https://forge.sourceware.org/gcc/gcc-TEST/pulls/42.diff\nDiscussion: https://forge.sourceware.org/gcc/gcc-TEST/pulls/42\nRequested Reviewers:\n\n```\nP3233R1 (DR for C++20/C++11, fixes LWG 4069 and 3508) clarifies that\nstd::atomic_ref<cv T> is meant to be supported.\n\nThis commit implements it by splitting the __atomic_ref class (that\natomic_ref inherits from) into a further base class (__atomic_ref_base):\n\n* __atomic_ref_base<T> implements the atomic API for const and non-const\n Ts (with specializations for integrals, floating points, pointers);\n* __atomic_ref<T> inherits from __atomic_ref_base<T>; if T is\n non-const adds on top the \"mutating\" atomic APIs like store(),\n exchange(), and so on; same discussion w.r.t. the specializations.\n\nThe primary atomic_ref is now meant to be used for cv-bool, not just\nbool, amend the detection accordingly.\n\nAt the same time, disable support for cv-qualified types in std::atomic\n(for instance, std::atomic<volatile T> isn't meaningful; one should use\nvolatile std::atomic<T>), again as per the paper.\n\n\tPR libstdc++/115402\n\nlibstdc++-v3/ChangeLog:\n\n\t* include/bits/atomic_base.h: Add support for atomic_ref<cv T>:\n\t refactor __atomic_ref into a further subclass in order to\n\t implement the constraints on atomic_ref mutating APIs; change\n _Tp in various function signatures to be value_type instead.\n\t* include/std/atomic: Add a static_assert to std::atomic, as per\n\t P3233R1, complementing the existing ones.\n\t* testsuite/29_atomics/atomic_ref/bool.cc: Add tests for\n\t cv types in atomic_ref.\n\t* testsuite/29_atomics/atomic_ref/deduction.cc: Likewise.\n\t* testsuite/29_atomics/atomic_ref/float.cc: Likewise.\n\t* testsuite/29_atomics/atomic_ref/generic.cc: Likewise.\n\t* testsuite/29_atomics/atomic_ref/integral.cc: Likewise.\n\t* testsuite/29_atomics/atomic_ref/pointer.cc: Likewise.\n\t* testsuite/29_atomics/atomic_ref/requirements.cc: Likewise.\n\t* testsuite/29_atomics/atomic_ref/wait_notify.cc: Likewise.\n\t* testsuite/29_atomics/atomic_ref/115402.cc: New test.\n```\n\n\nChanged files:\n- A: libstdc++-v3/testsuite/29_atomics/atomic_ref/115402.cc\n- M: libstdc++-v3/include/bits/atomic_base.h\n- M: libstdc++-v3/include/std/atomic\n- M: libstdc++-v3/testsuite/29_atomics/atomic_ref/bool.cc\n- M: libstdc++-v3/testsuite/29_atomics/atomic_ref/deduction.cc\n- M: libstdc++-v3/testsuite/29_atomics/atomic_ref/float.cc\n- M: libstdc++-v3/testsuite/29_atomics/atomic_ref/generic.cc\n- M: libstdc++-v3/testsuite/29_atomics/atomic_ref/integral.cc\n- M: libstdc++-v3/testsuite/29_atomics/atomic_ref/pointer.cc\n- M: libstdc++-v3/testsuite/29_atomics/atomic_ref/requirements.cc\n- M: libstdc++-v3/testsuite/29_atomics/atomic_ref/wait_notify.cc\n\n\nGiuseppe D'Angelo (1):\n libstdc++: add support for cv-qualified types in atomic_ref (P3323R1)\n\n libstdc++-v3/include/bits/atomic_base.h | 507 +++++++++++-------\n libstdc++-v3/include/std/atomic | 1 +\n .../testsuite/29_atomics/atomic_ref/115402.cc | 16 +\n .../testsuite/29_atomics/atomic_ref/bool.cc | 18 +\n .../29_atomics/atomic_ref/deduction.cc | 33 +-\n .../testsuite/29_atomics/atomic_ref/float.cc | 21 +-\n .../29_atomics/atomic_ref/generic.cc | 6 +\n .../29_atomics/atomic_ref/integral.cc | 6 +\n .../29_atomics/atomic_ref/pointer.cc | 6 +\n .../29_atomics/atomic_ref/requirements.cc | 70 ++-\n .../29_atomics/atomic_ref/wait_notify.cc | 10 +\n 11 files changed, 456 insertions(+), 238 deletions(-)\n create mode 100644 libstdc++-v3/testsuite/29_atomics/atomic_ref/115402.cc" }