{"id":2226774,"url":"http://patchwork.ozlabs.org/api/patches/2226774/?format=json","web_url":"http://patchwork.ozlabs.org/project/gcc/patch/bmm.hhup55wx16.gcc.gcc-TEST.tkaminsk.85.1.4@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":"2026-04-22T18:49:41","name":"[v1,04/10] Remove isConst template parameter in favor of separate specialzation for const _Tp.","commit_ref":null,"pull_url":null,"state":"new","archived":false,"hash":"b472bddb70453ac0fd20b14ea5d9835fca827a40","submitter":{"id":93223,"url":"http://patchwork.ozlabs.org/api/people/93223/?format=json","name":"tkaminsk via Sourceware Forge","email":"forge-bot+tkaminsk@forge-stage.sourceware.org"},"delegate":null,"mbox":"http://patchwork.ozlabs.org/project/gcc/patch/bmm.hhup55wx16.gcc.gcc-TEST.tkaminsk.85.1.4@forge-stage.sourceware.org/mbox/","series":[{"id":501094,"url":"http://patchwork.ozlabs.org/api/series/501094/?format=json","web_url":"http://patchwork.ozlabs.org/project/gcc/list/?series=501094","date":"2026-04-22T18:49:39","name":"WIP: libstdc++: add support for cv-qualified types in atomic_ref (P3323R1)","version":1,"mbox":"http://patchwork.ozlabs.org/series/501094/mbox/"}],"comments":"http://patchwork.ozlabs.org/api/patches/2226774/comments/","check":"pending","checks":"http://patchwork.ozlabs.org/api/patches/2226774/checks/","tags":{},"related":[],"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=38.145.34.32; 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server2.sourceware.org","From":"tkaminsk via Sourceware Forge\n ","Date":"Wed, 22 Apr 2026 18:49:41 +0000","Subject":"[PATCH v1 04/10] Remove isConst template parameter in favor of\n separate specialzation for const _Tp.","MIME-Version":"1.0","Content-Type":"text/plain; charset=UTF-8","Content-Transfer-Encoding":"8bit","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/85","References":"\n ","In-Reply-To":"\n ","X-Patch-URL":"\n https://forge.sourceware.org/tkaminsk/gcc/commit/e700db27a00c37f9d8ac7429dbbc768aa2714461","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 tkaminsk@gcc.gnu.org","Errors-To":"gcc-patches-bounces~incoming=patchwork.ozlabs.org@gcc.gnu.org"},"content":"From: Tomasz Kamiński \n\nWe already have had 3 separate specializations for integers/floating\n(difference_type is value_type), pointers (difference_type is ptrdiff_t)\nand rest. This requires having 4, and seems easier.\n---\n libstdc++-v3/include/bits/atomic_base.h | 60 ++++++++++++++-----------\n 1 file changed, 33 insertions(+), 27 deletions(-)","diff":"diff --git a/libstdc++-v3/include/bits/atomic_base.h b/libstdc++-v3/include/bits/atomic_base.h\nindex 4caa9e30b4dc..b124aae626a0 100644\n--- a/libstdc++-v3/include/bits/atomic_base.h\n+++ b/libstdc++-v3/include/bits/atomic_base.h\n@@ -1667,48 +1667,30 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION\n };\n \n template,\n \t bool = is_integral_v<_Tp> && !is_same_v, bool>,\n \t bool = is_floating_point_v<_Tp>,\n \t bool = is_pointer_v<_Tp>>\n struct __atomic_ref;\n \n- // base classes for const qualified types\n+ // base class for non-integral, non-floating-point, non-pointer types\n template\n- struct __atomic_ref<_Tp, true, false, false, false>\n+ struct __atomic_ref<_Tp, false, false, false>\n : __atomic_ref_base<_Tp>\n {\n using __atomic_ref_base<_Tp>::__atomic_ref_base;\n+ using __atomic_ref_base<_Tp>::operator=;\n };\n \n template\n- struct __atomic_ref<_Tp, true, false, false, true>\n- : __atomic_ref_base<_Tp>\n- {\n- using difference_type = ptrdiff_t;\n- using __atomic_ref_base<_Tp>::__atomic_ref_base;\n- };\n-\n- template\n- struct __atomic_ref<_Tp, true, _IsIntegral, _IsFloatingPoint, false>\n- : __atomic_ref_base<_Tp>\n+ struct __atomic_ref\n+ : __atomic_ref_base\n {\n- using difference_type = typename __atomic_ref_base<_Tp>::value_type;\n- using __atomic_ref_base<_Tp>::__atomic_ref_base;\n+ using __atomic_ref_base::__atomic_ref_base;\n };\n \n- // base class for non-integral, non-floating-point, non-pointer types\n- template\n- struct __atomic_ref<_Tp, false, false, false, false>\n- : __atomic_ref_base<_Tp>\n- {\n- using __atomic_ref_base<_Tp>::__atomic_ref_base;\n- using __atomic_ref_base<_Tp>::operator=;\n- };\n-\n // base class for atomic_ref\n template\n- struct __atomic_ref<_Tp, false, true, false, false>\n+ struct __atomic_ref<_Tp, true, false, false>\n : __atomic_ref_base<_Tp>\n {\n using value_type = typename __atomic_ref_base<_Tp>::value_type;\n@@ -1779,9 +1761,17 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION\n { return __atomic_impl::__xor_fetch(this->_M_ptr, __i); }\n };\n \n+ template\n+ struct __atomic_ref\n+ : __atomic_ref_base\n+ {\n+ using difference_type = typename __atomic_ref_base::value_type;\n+ using __atomic_ref_base::__atomic_ref_base;\n+ };\n+\n // base class for atomic_ref\n template\n- struct __atomic_ref<_Fp, false, false, true, false>\n+ struct __atomic_ref<_Fp, false, true, false>\n : __atomic_ref_base<_Fp>\n {\n using value_type = typename __atomic_ref_base<_Fp>::value_type;\n@@ -1809,9 +1799,17 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION\n { return __atomic_impl::__sub_fetch_flt(this->_M_ptr, __i); }\n };\n \n+ template\n+ struct __atomic_ref\n+ : __atomic_ref_base\n+ {\n+ using difference_type = typename __atomic_ref_base::value_type;\n+ using __atomic_ref_base::__atomic_ref_base;\n+ };\n+\n // base class for atomic_ref\n template\n- struct __atomic_ref<_Pt, false, false, false, true>\n+ struct __atomic_ref<_Pt, false, false, true>\n : __atomic_ref_base<_Pt>\n {\n using value_type = typename __atomic_ref_base<_Pt>::value_type;\n@@ -1870,6 +1868,14 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION\n \treturn __d * sizeof(_Et);\n }\n };\n+\n+ template\n+ struct __atomic_ref\n+ : __atomic_ref_base\n+ {\n+ using difference_type = ptrdiff_t;\n+ using __atomic_ref_base::__atomic_ref_base;\n+ };\n #endif // C++2a\n \n /// @endcond\n","prefixes":["v1","04/10"]}