{"id":2221504,"url":"http://patchwork.ozlabs.org/api/1.2/patches/2221504/?format=json","web_url":"http://patchwork.ozlabs.org/project/gcc/patch/20260409152207.515172-1-tkaminsk@redhat.com/","project":{"id":17,"url":"http://patchwork.ozlabs.org/api/1.2/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":"<20260409152207.515172-1-tkaminsk@redhat.com>","list_archive_url":null,"date":"2026-04-09T15:04:11","name":"libstdc++: Add default template parameters for uninitialized_fill(_n).","commit_ref":null,"pull_url":null,"state":"new","archived":false,"hash":"36d3e184b040428d942062c9326a1061a976dc10","submitter":{"id":90409,"url":"http://patchwork.ozlabs.org/api/1.2/people/90409/?format=json","name":"Tomasz Kaminski","email":"tkaminsk@redhat.com"},"delegate":null,"mbox":"http://patchwork.ozlabs.org/project/gcc/patch/20260409152207.515172-1-tkaminsk@redhat.com/mbox/","series":[{"id":499315,"url":"http://patchwork.ozlabs.org/api/1.2/series/499315/?format=json","web_url":"http://patchwork.ozlabs.org/project/gcc/list/?series=499315","date":"2026-04-09T15:04:11","name":"libstdc++: Add default template parameters for uninitialized_fill(_n).","version":1,"mbox":"http://patchwork.ozlabs.org/series/499315/mbox/"}],"comments":"http://patchwork.ozlabs.org/api/patches/2221504/comments/","check":"pending","checks":"http://patchwork.ozlabs.org/api/patches/2221504/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\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=fVDJPWhu;\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 ","List-Unsubscribe":",\n ","List-Archive":"","List-Post":"","List-Help":"","List-Subscribe":",\n ","Errors-To":"gcc-patches-bounces~incoming=patchwork.ozlabs.org@gcc.gnu.org"},"content":"This implements P3217R0 and adds default argument for the value type\ntemplater parameter for uninitialized_fill, uninitialized_fill_n and\ntheir ranges counterpart.\n\nlibstdc++-v3/ChangeLog:\n\n\t* include/bits/ranges_uninitialized.h\n\t(__uninitialized_fill_fn::operator())\n\t(__uninitialized_fill_fn_n::operator()): Add default argument\n\tfor _Tp parameter.\n\t* include/bits/stl_uninitialized.h (std::unitialized_fill)\n\t(std::unitialized_fill_n): Likewise.\n\t* include/pstl/glue_memory_defs.h (std::unitialized_fill)\n\t(std::unitialized_fill_n): Likewise.\n\t* include/bits/version.def (algorithm_default_value_type):\n\tBump to 202603.\n\t* include/bits/version.h: Regenerate.\n\t* testsuite/25_algorithms/default_template_value.cc:\n\tTest for new algorithms.\n---\n\nTested lightly locally, the default_template_value.cc passes.\nTesting on x86_64-linux. OK for trunk when all test passes?\n\n libstdc++-v3/include/bits/ranges_uninitialized.h | 9 ++++++---\n libstdc++-v3/include/bits/stl_uninitialized.h | 6 ++++--\n libstdc++-v3/include/bits/version.def | 5 ++++-\n libstdc++-v3/include/bits/version.h | 4 ++--\n libstdc++-v3/include/pstl/glue_memory_defs.h | 5 +++--\n .../25_algorithms/default_template_value.cc | 15 ++++++++++++++-\n 6 files changed, 33 insertions(+), 11 deletions(-)","diff":"diff --git a/libstdc++-v3/include/bits/ranges_uninitialized.h b/libstdc++-v3/include/bits/ranges_uninitialized.h\nindex 6e307ea43c6..f7845abd3f3 100644\n--- a/libstdc++-v3/include/bits/ranges_uninitialized.h\n+++ b/libstdc++-v3/include/bits/ranges_uninitialized.h\n@@ -458,7 +458,8 @@ namespace ranges\n struct __uninitialized_fill_fn\n {\n template<__detail::__nothrow_forward_iterator _Iter,\n-\t __detail::__nothrow_sentinel<_Iter> _Sent, typename _Tp>\n+\t __detail::__nothrow_sentinel<_Iter> _Sent,\n+\t typename _Tp _GLIBCXX26_DEF_VAL_T(iter_value_t<_Iter>)>\n requires constructible_from, const _Tp&>\n _GLIBCXX26_CONSTEXPR\n _Iter\n@@ -478,7 +479,8 @@ namespace ranges\n \t }\n }\n \n- template<__detail::__nothrow_forward_range _Range, typename _Tp>\n+ template<__detail::__nothrow_forward_range _Range,\n+\t typename _Tp _GLIBCXX26_DEF_VAL_T(range_value_t<_Range>)>\n requires constructible_from, const _Tp&>\n _GLIBCXX26_CONSTEXPR\n borrowed_iterator_t<_Range>\n@@ -492,7 +494,8 @@ namespace ranges\n \n struct __uninitialized_fill_n_fn\n {\n- template<__detail::__nothrow_forward_iterator _Iter, typename _Tp>\n+ template<__detail::__nothrow_forward_iterator _Iter,\n+\t typename _Tp _GLIBCXX26_DEF_VAL_T(iter_value_t<_Iter>)>\n requires constructible_from, const _Tp&>\n _GLIBCXX26_CONSTEXPR\n _Iter\ndiff --git a/libstdc++-v3/include/bits/stl_uninitialized.h b/libstdc++-v3/include/bits/stl_uninitialized.h\nindex 1c1fcfd62a4..ae4442f3858 100644\n--- a/libstdc++-v3/include/bits/stl_uninitialized.h\n+++ b/libstdc++-v3/include/bits/stl_uninitialized.h\n@@ -406,7 +406,8 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION\n *\n * Like std::fill, but does not require an initialized output range.\n */\n- template\n+ template\n _GLIBCXX26_CONSTEXPR\n inline void\n uninitialized_fill(_ForwardIterator __first, _ForwardIterator __last,\n@@ -542,7 +543,8 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION\n *\n * Like std::fill_n, but does not require an initialized output range.\n */\n- template\n+ template\n _GLIBCXX26_CONSTEXPR\n inline _ForwardIterator\n uninitialized_fill_n(_ForwardIterator __first, _Size __n, const _Tp& __x)\ndiff --git a/libstdc++-v3/include/bits/version.def b/libstdc++-v3/include/bits/version.def\nindex cfb90533ce4..9a3b3655974 100644\n--- a/libstdc++-v3/include/bits/version.def\n+++ b/libstdc++-v3/include/bits/version.def\n@@ -2086,8 +2086,11 @@ ftms = {\n \n ftms = {\n name = algorithm_default_value_type;\n+ // 202403 P2248R8 Enabling list-initialization for algorithms\n+ // P3787R2 Adjoints to \"Enabling ...\": find_last\n+ // 202603 P3787R2 Adjoints to \"Enabling ...\": uninitialized_fill\n values = {\n- v = 202403;\n+ v = 202603;\n cxxmin = 26;\n };\n };\ndiff --git a/libstdc++-v3/include/bits/version.h b/libstdc++-v3/include/bits/version.h\nindex 22dd31b9d32..8f541fc389e 100644\n--- a/libstdc++-v3/include/bits/version.h\n+++ b/libstdc++-v3/include/bits/version.h\n@@ -2328,9 +2328,9 @@\n \n #if !defined(__cpp_lib_algorithm_default_value_type)\n # if (__cplusplus > 202302L)\n-# define __glibcxx_algorithm_default_value_type 202403L\n+# define __glibcxx_algorithm_default_value_type 202603L\n # if defined(__glibcxx_want_all) || defined(__glibcxx_want_algorithm_default_value_type)\n-# define __cpp_lib_algorithm_default_value_type 202403L\n+# define __cpp_lib_algorithm_default_value_type 202603L\n # endif\n # endif\n #endif /* !defined(__cpp_lib_algorithm_default_value_type) */\ndiff --git a/libstdc++-v3/include/pstl/glue_memory_defs.h b/libstdc++-v3/include/pstl/glue_memory_defs.h\nindex 6729319a51b..2eb4e5dca6b 100644\n--- a/libstdc++-v3/include/pstl/glue_memory_defs.h\n+++ b/libstdc++-v3/include/pstl/glue_memory_defs.h\n@@ -10,6 +10,7 @@\n #ifndef _PSTL_GLUE_MEMORY_DEFS_H\n #define _PSTL_GLUE_MEMORY_DEFS_H\n \n+#include \n #include \"execution_defs.h\"\n \n namespace std\n@@ -37,11 +38,11 @@ uninitialized_move_n(_ExecutionPolicy&& __exec, _InputIterator __first, _Size __\n \n // [uninitialized.fill]\n \n-template \n+template \n __pstl::__internal::__enable_if_execution_policy<_ExecutionPolicy, void>\n uninitialized_fill(_ExecutionPolicy&& __exec, _ForwardIterator __first, _ForwardIterator __last, const _Tp& __value);\n \n-template \n+template \n __pstl::__internal::__enable_if_execution_policy<_ExecutionPolicy, _ForwardIterator>\n uninitialized_fill_n(_ExecutionPolicy&& __exec, _ForwardIterator __first, _Size __n, const _Tp& __value);\n \ndiff --git a/libstdc++-v3/testsuite/25_algorithms/default_template_value.cc b/libstdc++-v3/testsuite/25_algorithms/default_template_value.cc\nindex b05234e1f8d..60f3d95ddb3 100644\n--- a/libstdc++-v3/testsuite/25_algorithms/default_template_value.cc\n+++ b/libstdc++-v3/testsuite/25_algorithms/default_template_value.cc\n@@ -4,12 +4,14 @@\n \n #if !defined(__cpp_lib_algorithm_default_value_type)\n #error \"Feature test macro for default template type for algorithms' values is missing\"\n-#elif __cpp_lib_algorithm_default_value_type < 202403L\n+#elif __cpp_lib_algorithm_default_value_type < 202603L\n #error \"Feature test macro for default template type for algorithms' values is wrong\"\n #endif\n \n #include \n+#include \n #include \n+#include \n #include \n #include \n \n@@ -139,4 +141,15 @@ test()\n // [alg.find.last]\n (void) std::ranges::find_last(in.begin(), in.end(), INPUT_VAL);\n (void) std::ranges::find_last(in, INPUT_VAL);\n+\n+ extern std::span unin;\n+ // [uninitialized.fill]\n+ (void) std::uninitialized_fill(unin.begin(), unin.end(), INPUT_VAL);\n+ (void) std::uninitialized_fill(std::execution::seq, unin.begin(), unin.end(), INPUT_VAL);\n+ (void) std::ranges::uninitialized_fill(unin.begin(), unin.end(), INPUT_VAL);\n+ (void) std::ranges::uninitialized_fill(unin, INPUT_VAL);\n+\n+ (void) std::uninitialized_fill_n(unin.begin(), unin.size(), INPUT_VAL);\n+ (void) std::uninitialized_fill_n(std::execution::seq, unin.begin(), unin.size(), INPUT_VAL);\n+ (void) std::ranges::uninitialized_fill_n(unin.begin(), unin.size(), INPUT_VAL);\n }\n","prefixes":[]}