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GET /api/patches/2227817/?format=api
{ "id": 2227817, "url": "http://patchwork.ozlabs.org/api/patches/2227817/?format=api", "web_url": "http://patchwork.ozlabs.org/project/gcc/patch/20260424100453.1166034-1-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": "<20260424100453.1166034-1-tkaminsk@redhat.com>", "list_archive_url": null, "date": "2026-04-24T10:04:02", "name": "libstdc++: Constrain views::adjacent(_transform)?<0> to forward_ranges.", "commit_ref": null, "pull_url": null, "state": "new", "archived": false, "hash": "a79a60c06604752a40139fd52dacf95c6d54d711", "submitter": { "id": 90409, "url": "http://patchwork.ozlabs.org/api/people/90409/?format=api", "name": "Tomasz Kamiński", "email": "tkaminsk@redhat.com" }, "delegate": null, "mbox": "http://patchwork.ozlabs.org/project/gcc/patch/20260424100453.1166034-1-tkaminsk@redhat.com/mbox/", "series": [ { "id": 501335, "url": "http://patchwork.ozlabs.org/api/series/501335/?format=api", "web_url": "http://patchwork.ozlabs.org/project/gcc/list/?series=501335", "date": "2026-04-24T10:04:02", "name": "libstdc++: Constrain views::adjacent(_transform)?<0> to forward_ranges.", "version": 1, "mbox": "http://patchwork.ozlabs.org/series/501335/mbox/" } ], "comments": "http://patchwork.ozlabs.org/api/patches/2227817/comments/", "check": "pending", "checks": "http://patchwork.ozlabs.org/api/patches/2227817/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=X6TfN03X;\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=\"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 resolves LWG 4098, \"views::adjacent<0> should reject non-forward ranges\"\nwhich was approved in Sofia 2024.\n\nlibstdc++-v3/ChangeLog:\n\n\t* include/std/ranges (_AdjacentTransform::operator())\n\t(_Adjacent::operator()): Require forward_range for N == 0.\n\t* testsuite/std/ranges/adaptors/adjacent/1.cc: Test if input_ranges\n\tare rejected.\n\t* testsuite/std/ranges/adaptors/adjacent_transform/1.cc: Likewise.\n---\nTesting on x86_64-linux. *adaptors/adjacent* test passed.\nOK for trunk when all tests passes?\n\n libstdc++-v3/include/std/ranges | 10 ++++++++--\n .../testsuite/std/ranges/adaptors/adjacent/1.cc | 7 +++++++\n .../std/ranges/adaptors/adjacent_transform/1.cc | 7 +++++++\n 3 files changed, 22 insertions(+), 2 deletions(-)", "diff": "diff --git a/libstdc++-v3/include/std/ranges b/libstdc++-v3/include/std/ranges\nindex 9c7d639a154..ba4c9f60ab2 100644\n--- a/libstdc++-v3/include/std/ranges\n+++ b/libstdc++-v3/include/std/ranges\n@@ -5859,8 +5859,11 @@ namespace views::__adaptor\n template<size_t _Nm>\n struct _Adjacent : __adaptor::_RangeAdaptorClosure<_Adjacent<_Nm>>\n {\n+\t// _GLIBCXX_RESOLVE_LIB_DEFECTS\n+\t// 4098. views::adjacent<0> should reject non-forward ranges\n \ttemplate<viewable_range _Range>\n-\t requires (_Nm == 0) || __detail::__can_adjacent_view<_Nm, _Range>\n+\t requires (_Nm == 0) && forward_range<_Range>\n+\t\t || __detail::__can_adjacent_view<_Nm, _Range>\n \t constexpr auto\n \t operator() [[nodiscard]] (_Range&& __r) const\n \t {\n@@ -6197,8 +6200,11 @@ namespace views::__adaptor\n template<size_t _Nm>\n struct _AdjacentTransform : __adaptor::_RangeAdaptor<_AdjacentTransform<_Nm>>\n {\n+\t// _GLIBCXX_RESOLVE_LIB_DEFECTS\n+\t// 4098. views::adjacent<0> should reject non-forward ranges\n \ttemplate<viewable_range _Range, typename _Fp>\n-\t requires (_Nm == 0) || __detail::__can_adjacent_transform_view<_Nm, _Range, _Fp>\n+\t requires (_Nm == 0) && forward_range<_Range>\n+\t\t || __detail::__can_adjacent_transform_view<_Nm, _Range, _Fp>\n \t constexpr auto\n \t operator() [[nodiscard]] (_Range&& __r, _Fp&& __f) const\n \t {\ndiff --git a/libstdc++-v3/testsuite/std/ranges/adaptors/adjacent/1.cc b/libstdc++-v3/testsuite/std/ranges/adaptors/adjacent/1.cc\nindex 0a5c67f5614..57322922e5e 100644\n--- a/libstdc++-v3/testsuite/std/ranges/adaptors/adjacent/1.cc\n+++ b/libstdc++-v3/testsuite/std/ranges/adaptors/adjacent/1.cc\n@@ -9,6 +9,13 @@\n namespace ranges = std::ranges;\n namespace views = std::views;\n \n+template<typename Range>\n+concept can_adjacent0 = requires (Range& rg)\n+{ views::adjacent<0>(rg); };\n+\n+static_assert( !can_adjacent0<__gnu_test::test_input_range<int>> );\n+static_assert( can_adjacent0<__gnu_test::test_forward_range<int>> );\n+\n constexpr bool\n test01()\n {\ndiff --git a/libstdc++-v3/testsuite/std/ranges/adaptors/adjacent_transform/1.cc b/libstdc++-v3/testsuite/std/ranges/adaptors/adjacent_transform/1.cc\nindex 6890618754b..a75d02efbb8 100644\n--- a/libstdc++-v3/testsuite/std/ranges/adaptors/adjacent_transform/1.cc\n+++ b/libstdc++-v3/testsuite/std/ranges/adaptors/adjacent_transform/1.cc\n@@ -9,6 +9,13 @@\n namespace ranges = std::ranges;\n namespace views = std::views;\n \n+template<typename Range>\n+concept can_adjacent0 = requires (Range& rg)\n+{ views::adjacent_transform<0>(rg, []() { return 10; }); };\n+\n+static_assert( !can_adjacent0<__gnu_test::test_input_range<int>> );\n+static_assert( can_adjacent0<__gnu_test::test_forward_range<int>> );\n+\n constexpr bool\n test01()\n {\n", "prefixes": [] }