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| author | Ken Matsui <kmatsui@gcc.gnu.org> | 2023-09-11 17:14:32 -0700 |
|---|---|---|
| committer | Ken Matsui <kmatsui@gcc.gnu.org> | 2023-12-16 08:59:32 -0800 |
| commit | 4a235f8eb0f19292c007c4374d6b48ab01667a3b (patch) | |
| tree | edb2ae14247abf619aea97462834a18fa38350a5 | |
| parent | 8843cff6c98cb0789a1ec6f51be6c5122fc1b5e9 (diff) | |
| download | gcc-4a235f8eb0f19292c007c4374d6b48ab01667a3b.zip gcc-4a235f8eb0f19292c007c4374d6b48ab01667a3b.tar.gz gcc-4a235f8eb0f19292c007c4374d6b48ab01667a3b.tar.bz2 | |
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>
| -rw-r--r-- | libstdc++-v3/include/std/type_traits | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/libstdc++-v3/include/std/type_traits b/libstdc++-v3/include/std/type_traits index 2a1a0aa..4a50687 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 |