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GET /api/patches/2224566/?format=api
{ "id": 2224566, "url": "http://patchwork.ozlabs.org/api/patches/2224566/?format=api", "web_url": "http://patchwork.ozlabs.org/project/gcc/patch/20260417154009.1140472-1-ppalka@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": "<20260417154009.1140472-1-ppalka@redhat.com>", "list_archive_url": null, "date": "2026-04-17T15:40:09", "name": "libstdc++: Fix constraint recursion in std:indirect's operator== [PR124890]", "commit_ref": null, "pull_url": null, "state": "new", "archived": false, "hash": "758610638ce6e21a4ee6eec93cb010e0cc4bd5f4", "submitter": { "id": 78319, "url": "http://patchwork.ozlabs.org/api/people/78319/?format=api", "name": "Patrick Palka", "email": "ppalka@redhat.com" }, "delegate": null, "mbox": "http://patchwork.ozlabs.org/project/gcc/patch/20260417154009.1140472-1-ppalka@redhat.com/mbox/", "series": [ { "id": 500367, "url": "http://patchwork.ozlabs.org/api/series/500367/?format=api", "web_url": "http://patchwork.ozlabs.org/project/gcc/list/?series=500367", "date": "2026-04-17T15:40:09", "name": "libstdc++: Fix constraint recursion in std:indirect's operator== [PR124890]", "version": 1, "mbox": "http://patchwork.ozlabs.org/series/500367/mbox/" } ], "comments": "http://patchwork.ozlabs.org/api/patches/2224566/comments/", "check": "pending", "checks": "http://patchwork.ozlabs.org/api/patches/2224566/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=KcpylH25;\n\tdkim-atps=neutral", "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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charset=UTF-8", "Content-Transfer-Encoding": "8bit", "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": "Tested on x86_64-pc-linux-gnu, does this look OK for trunk?\n\nWe can also just implement the Mandates as a static_assert as pointed\nout by Lénárd. Otherwise, I prefer this approach rather than the\nforwarding reference approach since it's cleaner and we use this approach\nin other parts of the library with no complaints so far.\n\n-- >8 --\n\nLike in r16-559 for std::expected, std::indirect's operator== is also\nprone to constraint recursion due to CWG 2369. This patch works around\nthe recursion in a similar manner.\n\n\tPR libstdc++/124890\n\tPR libstdc++/119714\n\tPR libstdc++/112490\n\nlibstdc++-v3/ChangeLog:\n\n\t* include/bits/indirect.h (indirect::operator==): Replace\n\tnon-dependent std::indirect function parameter with a\n\tdependent one of type indirect<_Tp2> where _Tp2 matches _Tp.\n\t* testsuite/std/memory/indirect/124890.cc: New test.\n---\n libstdc++-v3/include/bits/indirect.h | 4 ++--\n libstdc++-v3/testsuite/std/memory/indirect/124890.cc | 9 +++++++++\n 2 files changed, 11 insertions(+), 2 deletions(-)\n create mode 100644 libstdc++-v3/testsuite/std/memory/indirect/124890.cc", "diff": "diff --git a/libstdc++-v3/include/bits/indirect.h b/libstdc++-v3/include/bits/indirect.h\nindex 2df46cc39a21..e1f7d1968b56 100644\n--- a/libstdc++-v3/include/bits/indirect.h\n+++ b/libstdc++-v3/include/bits/indirect.h\n@@ -344,11 +344,11 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION\n \t return __lhs.__get() == __rhs.__get();\n \t}\n \n- template<typename _Up>\n+ template<same_as<_Tp> _Tp2, typename _Up>\n \trequires (!__is_indirect<_Up>) // See PR c++/99599\n \t && requires (const _Tp& __t, const _Up& __u) { __t == __u; }\n \tfriend constexpr bool\n-\toperator==(const indirect& __lhs, const _Up& __rhs)\n+\toperator==(const indirect<_Tp2>& __lhs, const _Up& __rhs)\n \tnoexcept(noexcept(*__lhs == __rhs))\n \t{\n \t if (!__lhs._M_objp)\ndiff --git a/libstdc++-v3/testsuite/std/memory/indirect/124890.cc b/libstdc++-v3/testsuite/std/memory/indirect/124890.cc\nnew file mode 100644\nindex 000000000000..ce44256f2244\n--- /dev/null\n+++ b/libstdc++-v3/testsuite/std/memory/indirect/124890.cc\n@@ -0,0 +1,9 @@\n+// { dg-do compile { target c++26 } }\n+\n+// PR libstdc++/124890 - Circular constraint in std::indirect::operator==\n+\n+#include <memory>\n+#include <vector>\n+\n+using I = std::vector<std::indirect<int>>::iterator;\n+static_assert(std::totally_ordered<I>);\n", "prefixes": [] }