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{ "id": 2226068, "url": "http://patchwork.ozlabs.org/api/patches/2226068/?format=api", "web_url": "http://patchwork.ozlabs.org/project/gcc/patch/20260422073435.140670-1-tkaminsk@redhat.com/", "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": "<20260422073435.140670-1-tkaminsk@redhat.com>", "list_archive_url": null, "date": "2026-04-22T07:33:55", "name": "libstdc++: Accept data_handle_type by value in mdspan deduction guide.", "commit_ref": null, "pull_url": null, "state": "new", "archived": false, "hash": "4b97acf65cf37809d91d6a96d4c3cc4d3ac9d3c5", "submitter": { "id": 90409, "url": "http://patchwork.ozlabs.org/api/people/90409/?format=api", "name": "Tomasz Kaminski", "email": "tkaminsk@redhat.com" }, "delegate": null, "mbox": "http://patchwork.ozlabs.org/project/gcc/patch/20260422073435.140670-1-tkaminsk@redhat.com/mbox/", "series": [ { "id": 500934, "url": "http://patchwork.ozlabs.org/api/series/500934/?format=api", "web_url": "http://patchwork.ozlabs.org/project/gcc/list/?series=500934", "date": "2026-04-22T07:33:55", "name": "libstdc++: Accept data_handle_type by value in mdspan deduction guide.", "version": 1, "mbox": "http://patchwork.ozlabs.org/series/500934/mbox/" } ], "comments": "http://patchwork.ozlabs.org/api/patches/2226068/comments/", "check": "pending", "checks": "http://patchwork.ozlabs.org/api/patches/2226068/checks/", "tags": {}, "related": [], "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\tdkim=pass (1024-bit key;\n unprotected) header.d=redhat.com header.i=@redhat.com header.a=rsa-sha256\n header.s=mimecast20190719 header.b=c31G9aP+;\n\tdkim-atps=neutral", "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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charset=\"US-ASCII\"; x-default=true", "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>", "Errors-To": "gcc-patches-bounces~incoming=patchwork.ozlabs.org@gcc.gnu.org" }, "content": "This makes the deduction guide accepting data_handle_type, mapping\nand accessor consistent with corresponding constructor.\nResolves LWG4511.\n\nlibstdc++-v3/ChangeLog:\n\n\t* include/std/mdspan (mdspan): Remove reference from\n\t_AccessorType::data_handle_type parameteter of deduction\n\tguide.\n\t* testsuite/23_containers/mdspan/mdspan.cc: New test.\n---\nTesting on x86_64-linux locally. All *mdspan* test passed in C++23,C++26\nmode and with modules. OK for trunk when all test passes?\n\n libstdc++-v3/include/std/mdspan | 4 +++-\n .../testsuite/23_containers/mdspan/mdspan.cc | 19 +++++++++++++++++++\n 2 files changed, 22 insertions(+), 1 deletion(-)", "diff": "diff --git a/libstdc++-v3/include/std/mdspan b/libstdc++-v3/include/std/mdspan\nindex f30c5e83d16..fae4ce0baa2 100644\n--- a/libstdc++-v3/include/std/mdspan\n+++ b/libstdc++-v3/include/std/mdspan\n@@ -3267,8 +3267,10 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION\n -> mdspan<_ElementType, typename _MappingType::extents_type,\n \t typename _MappingType::layout_type>;\n \n+ // _GLIBCXX_RESOLVE_LIB_DEFECTS\n+ // 4511. Inconsistency between the deduction guide of std::mdspan taking...\n template<typename _MappingType, typename _AccessorType>\n- mdspan(const typename _AccessorType::data_handle_type&, const _MappingType&,\n+ mdspan(typename _AccessorType::data_handle_type, const _MappingType&,\n \t const _AccessorType&)\n -> mdspan<typename _AccessorType::element_type,\n \t typename _MappingType::extents_type,\ndiff --git a/libstdc++-v3/testsuite/23_containers/mdspan/mdspan.cc b/libstdc++-v3/testsuite/23_containers/mdspan/mdspan.cc\nindex 270b3f18daa..62ff7201cce 100644\n--- a/libstdc++-v3/testsuite/23_containers/mdspan/mdspan.cc\n+++ b/libstdc++-v3/testsuite/23_containers/mdspan/mdspan.cc\n@@ -404,6 +404,24 @@ template<typename CustomInt, bool ValidForPacks, bool ValidForArrays>\n return true;\n }\n \n+void\n+test_from_volatile_ptr_and_accessor()\n+{\n+ constexpr size_t n = 3*5*7;\n+ std::array<double, n> storage{};\n+ double* volatile vptr = storage.data();\n+ using Extents = std::extents<int, 3, 5, 7>;\n+\n+ auto exts = Extents{};\n+ auto m = std::layout_left::mapping(exts);\n+ auto a = std::default_accessor<double>{};\n+ auto md = std::mdspan(vptr, m, a);\n+\n+ assert_deduced_typedefs<double, Extents, std::layout_left>(md);\n+ VERIFY(md.data_handle() == storage.data());\n+ VERIFY(md.mapping() == m);\n+}\n+\n template<typename T, bool NothrowConstructible = true,\n \t bool NothrowAssignable = true>\n class OpaqueAccessor\n@@ -757,6 +775,7 @@ main()\n test_from_int_like<RValueInt, true, false>();\n test_from_int_like<ConstLValueInt, false, true>();\n \n+ test_from_volatile_ptr_and_accessor();\n test_from_opaque_accessor();\n test_from_base_class_accessor();\n test_from_mapping_like();\n", "prefixes": [] }