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GET /api/1.1/patches/2233433/?format=api
{ "id": 2233433, "url": "http://patchwork.ozlabs.org/api/1.1/patches/2233433/?format=api", "web_url": "http://patchwork.ozlabs.org/project/gcc/patch/20260506123827.395657-1-tkaminsk@redhat.com/", "project": { "id": 17, "url": "http://patchwork.ozlabs.org/api/1.1/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 }, "msgid": "<20260506123827.395657-1-tkaminsk@redhat.com>", "date": "2026-05-06T12:38:13", "name": "libstdc++: Format all contiguous ranges usign spoan.", "commit_ref": null, "pull_url": null, "state": "new", "archived": false, "hash": "a001cbb4fa7c031592a3a00dbef98c43b349a151", "submitter": { "id": 90409, "url": "http://patchwork.ozlabs.org/api/1.1/people/90409/?format=api", "name": "Tomasz Kamiński", "email": "tkaminsk@redhat.com" }, "delegate": null, "mbox": "http://patchwork.ozlabs.org/project/gcc/patch/20260506123827.395657-1-tkaminsk@redhat.com/mbox/", "series": [ { "id": 502980, "url": "http://patchwork.ozlabs.org/api/1.1/series/502980/?format=api", "web_url": "http://patchwork.ozlabs.org/project/gcc/list/?series=502980", "date": "2026-05-06T12:38:13", "name": "libstdc++: Format all contiguous ranges usign spoan.", "version": 1, "mbox": "http://patchwork.ozlabs.org/series/502980/mbox/" } ], "comments": "http://patchwork.ozlabs.org/api/patches/2233433/comments/", "check": "pending", "checks": "http://patchwork.ozlabs.org/api/patches/2233433/checks/", "tags": {}, "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=YVhBnaLe;\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": "We convert all contiguous ranges into span of the possibly-const qualified\n_Tp (__format::__maybe_const<_Tp, _CharT>). The span object is const qualifed,\nto trigger _M_format<const span<T>> specialization, that is already used by\nformatter specialization for ranges.\n\nThis conversion is applied regardless if range is sized, and ranges::distance\nto compute the size. Even for user-defined iterators, they will observe range\nbeing iterated only once.\n\nFinally, using raw pointers to iterate range during formatting guarantees,\nthat no stdio lock will be taken. In consequence it would be now possible\nto enable_nonlocking_formatter_optimization for all contiguous ranges.\n\nlibstdc++-v3/ChangeLog:\n\n\t* include/std/format (range_formatter::format): Format all\n\tcontiguous ranges as span<__format::__maybe_const<_Tp, _CharT>>.\n---\n libstdc++-v3/include/std/format | 8 +++++++-\n 1 file changed, 7 insertions(+), 1 deletion(-)", "diff": "diff --git a/libstdc++-v3/include/std/format b/libstdc++-v3/include/std/format\nindex 4627381fa9e..60adca93b5d 100644\n--- a/libstdc++-v3/include/std/format\n+++ b/libstdc++-v3/include/std/format\n@@ -6175,7 +6175,13 @@ namespace __format\n \tformat(_Rg&& __rg, basic_format_context<_Out, _CharT>& __fc) const\n \t{\n \t using _Range = remove_reference_t<_Rg>;\n-\t if constexpr (__format::__simply_formattable_range<_Range, _CharT>)\n+\t if constexpr (ranges::contiguous_range<_Rg>)\n+\t {\n+\t const span<__format::__maybe_const<_Tp, _CharT>>\n+\t\t__spn(ranges::data(__rg), size_t(ranges::distance(__rg)));\n+\t return _M_format(__spn, __fc);\n+\t }\n+\t else if constexpr (__format::__simply_formattable_range<_Range, _CharT>)\n \t return _M_format<const _Range>(__rg, __fc);\n \t else\n \t return _M_format(__rg, __fc);\n", "prefixes": [] }