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From: Ken Matsui <kmatsui@gcc.gnu.org> To: gcc-cvs@gcc.gnu.org, libstdc++-cvs@gcc.gnu.org Subject: [gcc r14-6625] libstdc++: Optimize std::is_scoped_enum compilation performance Date: Sat, 16 Dec 2023 17:00:19 +0000 (GMT) [thread overview] Message-ID: <20231216170019.7F7B6387088E@sourceware.org> (raw) https://gcc.gnu.org/g:4a235f8eb0f19292c007c4374d6b48ab01667a3b commit r14-6625-g4a235f8eb0f19292c007c4374d6b48ab01667a3b Author: Ken Matsui <kmatsui@gcc.gnu.org> Date: Mon Sep 11 17:14:32 2023 -0700 libstdc++: Optimize std::is_scoped_enum compilation performance This patch optimizes the compilation performance of std::is_scoped_enum by dispatching to the new __is_scoped_enum built-in trait. libstdc++-v3/ChangeLog: * include/std/type_traits (is_scoped_enum): Use __is_scoped_enum built-in trait. (is_scoped_enum_v): Likewise. Signed-off-by: Ken Matsui <kmatsui@gcc.gnu.org> Reviewed-by: Jonathan Wakely <jwakely@redhat.com> Diff: --- libstdc++-v3/include/std/type_traits | 12 ++++++++++++ 1 file changed, 12 insertions(+) diff --git a/libstdc++-v3/include/std/type_traits b/libstdc++-v3/include/std/type_traits index 2a1a0aa80ff..4a5068791af 100644 --- a/libstdc++-v3/include/std/type_traits +++ b/libstdc++-v3/include/std/type_traits @@ -3602,6 +3602,12 @@ template<typename _Ret, typename _Fn, typename... _Args> /// True if the type is a scoped enumeration type. /// @since C++23 +# if _GLIBCXX_USE_BUILTIN_TRAIT(__is_scoped_enum) + template<typename _Tp> + struct is_scoped_enum + : bool_constant<__is_scoped_enum(_Tp)> + { }; +# else template<typename _Tp> struct is_scoped_enum : false_type @@ -3613,11 +3619,17 @@ template<typename _Ret, typename _Fn, typename... _Args> struct is_scoped_enum<_Tp> : bool_constant<!requires(_Tp __t, void(*__f)(int)) { __f(__t); }> { }; +# endif /// @ingroup variable_templates /// @since C++23 +# if _GLIBCXX_USE_BUILTIN_TRAIT(__is_scoped_enum) + template<typename _Tp> + inline constexpr bool is_scoped_enum_v = __is_scoped_enum(_Tp); +# else template<typename _Tp> inline constexpr bool is_scoped_enum_v = is_scoped_enum<_Tp>::value; +# endif #endif #ifdef __cpp_lib_reference_from_temporary // C++ >= 23 && ref_{converts,constructs}_from_temp
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