{"id":2228656,"url":"http://patchwork.ozlabs.org/api/1.1/patches/2228656/?format=json","web_url":"http://patchwork.ozlabs.org/project/gcc/patch/ae8NG1FTPg1QV34A@tucnak/","project":{"id":17,"url":"http://patchwork.ozlabs.org/api/1.1/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},"msgid":"","date":"2026-04-27T07:15:40","name":"libstdc++: Fix up std::is_scalar for std::meta::info [PR125024]","commit_ref":null,"pull_url":null,"state":"new","archived":false,"hash":"a8509df85dba142b2af83eef3875bd8154bb2b06","submitter":{"id":671,"url":"http://patchwork.ozlabs.org/api/1.1/people/671/?format=json","name":"Jakub Jelinek","email":"jakub@redhat.com"},"delegate":null,"mbox":"http://patchwork.ozlabs.org/project/gcc/patch/ae8NG1FTPg1QV34A@tucnak/mbox/","series":[{"id":501597,"url":"http://patchwork.ozlabs.org/api/1.1/series/501597/?format=json","web_url":"http://patchwork.ozlabs.org/project/gcc/list/?series=501597","date":"2026-04-27T07:15:40","name":"libstdc++: Fix up std::is_scalar for std::meta::info [PR125024]","version":1,"mbox":"http://patchwork.ozlabs.org/series/501597/mbox/"}],"comments":"http://patchwork.ozlabs.org/api/patches/2228656/comments/","check":"pending","checks":"http://patchwork.ozlabs.org/api/patches/2228656/checks/","tags":{},"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=ImLZyaHT;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=temperror (SPF Temporary Error: DNS Timeout) smtp.mailfrom=gcc.gnu.org\n (client-ip=2620:52:6:3111::32; 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charset=us-ascii","Content-Disposition":"inline","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 ","Reply-To":"Jakub Jelinek ","Errors-To":"gcc-patches-bounces~incoming=patchwork.ozlabs.org@gcc.gnu.org"},"content":"Hi!\n\nhttps://eel.is/c++draft/basic.types.general#9.sentence-1 says that\nstd::meta::info and its cv-qualified versions are scalar types too\n(and in https://eel.is/c++draft/basic.fundamental#19.sentence-1\nthat they are fundamental types too).\nNow, on the reflection side, eval_is_scalar_type is handled\nin the compiler and uses SCALAR_TYPE_P (type) which includes\nREFLECTION_TYPE_P check and eval_is_fundamental_type includes that\nexplicitly too.\nstd::is_fundamental uses\n template\n struct is_fundamental\n : public __or_, is_void<_Tp>,\n is_null_pointer<_Tp>\n #if __cpp_impl_reflection >= 202506L\n , is_reflection<_Tp>\n #endif\n >::type\n { };\nbut for std::is_scalar we apparently forgot to include is_reflection.\n\nThe following patch fixes that.\n\nBootstrapped/regtested on x86_64-linux and i686-linux, ok for trunk/16.2?\n\n2026-04-26 Jakub Jelinek \n\n\tPR libstdc++/125024\n\t* include/std/type_traits (std::is_scalar): For\n\t__cpp_impl_reflection >= 202506L handle is_reflection types as\n\tscalar.\n\t* testsuite/20_util/is_scalar/reflection.cc: New test.\n\n\n\tJakub","diff":"--- libstdc++-v3/include/std/type_traits.jj\t2026-04-09 18:09:11.002020134 +0200\n+++ libstdc++-v3/include/std/type_traits\t2026-04-26 19:20:37.109205308 +0200\n@@ -871,7 +871,11 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION\n template\n struct is_scalar\n : public __or_, is_enum<_Tp>, is_pointer<_Tp>,\n- is_member_pointer<_Tp>, is_null_pointer<_Tp>>::type\n+ is_member_pointer<_Tp>, is_null_pointer<_Tp>\n+#if __cpp_impl_reflection >= 202506L\n+\t\t , is_reflection<_Tp>\n+#endif\n+\t\t >::type\n { };\n \n /// is_compound\n--- libstdc++-v3/testsuite/20_util/is_scalar/reflection.cc.jj\t2026-04-26 20:30:15.661943601 +0200\n+++ libstdc++-v3/testsuite/20_util/is_scalar/reflection.cc\t2026-04-26 20:49:40.107965736 +0200\n@@ -0,0 +1,13 @@\n+// { dg-do compile { target c++26 } }\n+// { dg-additional-options \"-freflection\" }\n+\n+#include \n+#include \n+\n+void test01()\n+{\n+ using std::is_scalar;\n+ using namespace __gnu_test;\n+\n+ static_assert(test_category(true), \"\");\n+}\n","prefixes":[]}