{"id":2226665,"url":"http://patchwork.ozlabs.org/api/covers/2226665/?format=json","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=json","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":"","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=json","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=json","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":"","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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server2.sourceware.org","From":"peppe via Sourceware Forge ","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 ","Message-ID":"\n ","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 ","List-Unsubscribe":",\n ","List-Archive":"","List-Post":"","List-Help":"","List-Subscribe":",\n ","Reply-To":"gcc-patches mailing list ,\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 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 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 implements the atomic API for const and non-const\n Ts (with specializations for integrals, floating points, pointers);\n* __atomic_ref inherits from __atomic_ref_base; 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 isn't meaningful; one should use\nvolatile std::atomic), 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:\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"}